IsseI Suzuki 　

Senior Assitant Professor
Doctor of engineering
Omata Lab at Tohoku Univ., Japan

Google scholar, ResearchGate, Researchmap

issei.suzuki [at] tohoku.ac.jp　

Japanese

Hello, here is my personal Homepage. I am writing this from Japan.
While social networking already became something of a must, I still like the old-fashioned "homepage" like here.
Please feel free to contact me by email or ResearchGate.

Experience

2023-Present: Senior Assistant Professor at Tohoku Univ., Japan
2018-2023: Assistant professor at Tohoku Univ., Japan
2019-2022: Visiting assistant professor at NREL (Andriy Zakutayev's Group), US
2018-2021: Guest Researcher at NIMS, Japan
2016-2018: JSPS overseas research fellow at Tech. Univ. of Darmstadt (Andreas Klein's Lab), Germany
2014-2016: JSPS research fellow (DC2) at Osaka Univ., Japan

Education

2013-2016: PhD., Materials science, Osaka Univ., Japan
2011-2013: Master, Materials science, Osaka Univ., Japan
2007-2011: Bachelor, Engineering, Osaka Univ., Japan

Research interests and topics

I have been working on functional inorganic materials since 2011.

Keywords: Inorganic materials / β-CuGaO2, β-AgGaO2, β-LiGaO2 / Tin sulfide (SnS) / Proton conductors /
Ion-exchange / First-principles calculation / Photovoltaics / Interface analysis / XPS

Synthesis of novel oxide semiconductors via ion-exchange

β-CuGaO2, which is an oxide semiconductors with extremely rare physical properties, was synthesized for the first time by me and my colleagues in 2014; it is the only oxide semiconductor having a direct band gap in NIR region and exhibit p-type conduction. I have recently been developing its thin-film technique to apply it to the PVs. An invited review paper summarizing the research of β-CuGaO2 and related materials has been published (link).

n-type SnS and their application to the photovoltaics

SnS is expected as an absorber of the next generation PVs. Homojunction of SnS is predicted to have higher efficiency than heterojunction (e.g., p-SnS/n-CdS), it is known to be difficult to fabricate n-type SnS. I have been working on synthesis of n-type SnS in a collaboration with Univ. of Yamanashi and NREL since 2018.

Electrolyte and electrode Intermediate temperature fuel cells

Intermediate temperature fuel cells (ITFCs) have been expected as the next-generation energy source since a long time ago; however, proper electrolyte and electrode are yet to be established. I have been working on the electrolyte and electrode for protonic fuel cells since 2018.

First principles calculations of novel inorganic materials

First-principles calculation is a great tool to predict the physical properties of novel materials or materials that do not yet exist while I think I am one of the experimentalists. It was used to evaluate the physical properties of β-CuGaO2 and its related materials. By comparing the electronic structures of polymorphic oxide semiconductors, relationship b/w their crystal structure and physical properties were clarified.

XPS analysis of the electronic structure at interfaces

Band alignment and band bending of the semiconductors at the interfaces can be clarified by XPS analysis. Very recently, I have clarified that the oxide semiconductor containing monovalent Cu, β-CuGaO2 and α-CuGaO2, has a limitation in Fermi level energy because of reduction and oxidation of Cu at the interface.

Publications

44. "Replacing Sodium Ions with Protons in Vanadophosphate Glass:

Suppression of Electronic Conduction by Local Structural Change around Vanadium Ions"

A. Sharma, I. Suzuki, K. Toyooka, T. Ishiyama, J. Nishii, T. Omata

J. Phys. Chem. C 28, 9793–9801 (2024)

43. "Designing Topotactic Ion-Exchange Reactions in Solid-State Oxides Through First-Principles Calculations"

I. Suzuki, M. Kita, T. Omata
Chem. Mater., 36, 4196-4203 (2024)

42. "Low-temperature growth of BaZrO3 and Ba(Zr,Y)O3 thin films via spray pyrolysis deposition"

I. Suzuki, H. Tawarayama, M. Majima, T. Omata
Thin Solid Films, 792, 140249 (2024)

41. "Alkali Mono-Pnictides: A New Class of Photovoltaic Materials by Element Mutation"

Y. Kumagai, S. R. Kavanagh, I. Suzuki, T. Omata, A. Walsh, D. O. Scanlon, H. Morito
PRX Energy, 2, 043002 (2023)

40. "Carrier control in SnS by doping: A review"

I. Suzuki
J. Ceram. Soc. Jpn. 131, 777-788 (2023)

39. "Enhancing proton mobility and thermal stability in phosphate glasses with WO3:

The mixed glass former effect in proton conducting glasses"

S. Aman, I. Suzuki, T. Ishiyama, T. Omata
Phys. Chem. Chem. Phys., 25, 18766-18774 (2023)

38. "High open-circuit voltage in single-crystalline n-type SnS/MoO3 photovoltaics"

I. Suzuki, Z. Lin, T. Nogami, S. Kawanishi, B. Huang, A. Klein, T. Omata
APL Mater., 11, 031116 (2023)

37. "Pulsed laser deposition of β-NaGaO2: significant dependence of sodium fraction,

morphology, and phases of the film on deposition position in the plume"

S. Suzuki, I. Suzuki, T. Omata
Jpn. J. Appl. Phys. 62, 035502 (2023)

36. "Experimental Identification of Atomic Orbital Contributions to SnS Valence

Band using Polarization-Dependent Angle-Resolved Photoemission Spectroscopy"

I. Suzuki, S. Kawanishi, K. Tanaka, T. Omata, S. Tanaka
Phys. Status Solidi B, 260, 2200408 (2023)

35. "Avoiding Fermi level pinning at SnS interface for high open-circuit voltage"

I. Suzuki, B. Huang, S. Kawanishi, T. Omata, A. Klein
J. Phys. Chem. C, 126, 20570 (2022)

34. "Phase transformation of metastable Cu2ZnGeO4 with a wurtz–kesterite structure at elevated temperatures"

M. Kita, I. Suzuki, M. Wada, T. Omata
Inorg. Chem., 61, 35, 13700-13707 (2022)

33. "Current status of n-Type SnS: Paving the way for SnS homojunction solar cells" [Invited review]

I. Suzuki, S. Kawanishi, T. Omata, H. Yanagi
J. Phys. Energy, 4, 042002 (2022)

32. "Growth of β-NaGaO2 thin films using ultrasonic spray pyrolysis"

I. Suzuki, S. Suzuki, T. Watanabe, M. Kita, T. Omata
J. Asian Ceram. Soc., 10, 2, 520-529 (2022)

31. "Contribution of the Sn 5s state to the SnS valence band: direct observation via ARPES measurements"

I. Suzuki, S. Kawanishi, K. Tanaka, T. Omata, S. Tanaka
Electronic Structure, 4, 025004 (2022)

30. "Direct evaluation of hole effective mass of SnS–SnSe solid solutions with ARPES measurement"

I. Suzuki, Z. Lin, S. Kawanishi, K. Tanaka, Y. Nose, T. Omata, S. Tanaka
Phys. Chem. Chem. Phys., 24, 634-638 (2022)

29. "First Principles Calculation of Electrical and Optical Properties of Cu3AsO4:

Promising Thin-Film Solar Cell Absorber from Nonferrous Metal Manufacturing By-Products"

I. Suzuki, S. Kawanishi, N. Ohashi, A. Gomi, J. Kano, H. Watanabe, S. Asano, T. Omata
Mater. Trans., 63, 73-81 (2022)

28. "Anhydrous Silicophosphoric Acid Glass: Thermal Properties and Proton Conductivity"

T. Omata, A. Sharma, I. Suzuki, T. Ishiyama, S. Kohara, K. Ohara, M. Ono, Y. Ren, K. Zagarzusem, M. Fujioka, G. Zhao, J. Nishii
ChemPhysChem, 22, e2021008(2022)

27. "N-Type Electrical Conduction in SnS Thin Films"

I. Suzuki, S. Kawanishi, S. R. Bauers, A. Zakutayev, Z. Lin, S. Tsukuda, H. Shibata, M. Kim, H. Yanagi, T. Omata
Phys. Rev. Mater., 5, 125405. (2021)

26. "Investigating the role of GeO2 in enhancing the thermal stability

and proton mobility of proton-conducting phosphate glasses"

T. Omata, A. Sharma, T. Kinoshita, I. Suzuki, T. Ishiyama, S. Kohara, K. Ohara, M. Ono, T. Fang, Y. Ren, M. Fujioka, G. Zhao, J. Nishii
J. Mater. Chem. A. 9, 20595−20606 (2021)

25. "SnS Homojunction Solar Cell with n‐Type Single Crystal and p‐Type Thin Film"

S. Kawanishi, I. Suzuki, S. R. Bauers, A. Zakutayev, H. Shibata, H. Yanagi, T. Omata
Solar RRL, 5, 2000708 (2021)

24. "Understanding the effect of oxide components on proton mobility

in phosphate glasses using a statical analysis approach”

T. Omata, I. Suzuki, A. Sharma, T. Ishiyama, J. Nishii, T. Yamashita, H. Kawazoe
RSC Adv. 11, 3012−3019(2021)

23. "Fermi Energy Limitation at β-CuGaO2 Interfaces Induced by Electrochemical Oxidation/Reduction of Cu"

I. Suzuki, B. Huang, T. Omata, and A. Klein
ACS Appl. Energy Mater.,3, 9117-9125 (2020)

22. "Growth of Large Single Crystals of n-Type SnS from Halogen-Added Sn Flux"

S. Kawanishi, I. Suzuki, T. Ohsawa, N. Ohashi, H. Shibata, T. Omata
Cryst. Growth Des., 20, 5931-5939 (2020)

21. "Ultra-thin phosphate glass exhibiting high proton conductivity at intermediate temperatures"

I. Suzuki, M. Tashiro, T. Yamaguchi, T. Ishiyama, J. Nishii, T. Yamashita, H. Kawazoe,T. Omata,
Int. J. Hydrogen Energy, 45, 16690-16697 (2020)

20. “Comprehensive first-principles study of AgGaO2 and CuGaO2 polymorphs”

I. Suzuki, Y. Iguchi, C. Sato, H. Yanagi, N. Ohashi, T. Omata
J. Ceram. Soc. Jpn. 127, 339-347 (2019)

19. “Tunable Direct Band Gap of β-CuGaO2 and β-LiGaO2 Solid Solutions in the Full Visible Range”

I. Suzuki, Y. Mizuno, T. Omata
Inorg. Chem. 58, 4262-4267 (2019)

18. "The energy level of the Fe2+/3+-transition in BaTiO3 and SrTiO3 single crystals"

I. Suzuki, L.Gura, A. Klein
Phys. Chem. Chem. Phys. 21, 6238 (2019)

17. "Flux Growth of β-NaGaO2 Single Crystals"

I. Suzuki, A. Kakinuma, M. Ueda, T. Omata
J. Cryst. Growth. 504, 26-30 (2018)

16. "Controlling the electrical conductivity of ternary wurtzite-type and metastable β-AgGaO2 by impurity doping"

H. Nagatani, I. Suzuki, S. Takemura, S. Fujimoto, T. Omata
AIP Advances, 8, 85203-1-9 (2018)

15. "Wurtzite-derived quaternary oxide semiconductor Cu2ZnGeO4;

its structural characteristics, optical properties and electronic structure"

M. Kita, I. Suzuki, N. Ohashi, T. Omata
Inorg. Chem. 56, 14277−14283 (2017)

14. "Orientation control of β-NaGaO2 thin film: a precursor for β-CuGaO2 as a thin-film solar cell absorber"

I. Suzuki, M. Tanemura, T. Omata
J. Ceram. Soc. Jpn., 125, 872-875 (2017)

13. "Fabrication of β-CuGaO2 thin-films by ion-exchange of β-NaGaO2 thin-films"

I. Suzuki, H. Nagatani, M. Kita, T. Omata
Appl. Phys. Express 10, 095501(2017)

12. "Variation of crystal structure and optical properties of wurtzite-type oxide semiconductor alloys of β-Cu(Ga,Al)O2"

H. Nagatani, Y. Mizuno, I. Suzuki, M. Kita, N. Ohashi, T. Omata
J. Appl. Phys. 121, 235103 (2017)

11. "Multinary wurtzite-type oxide semiconductors: present status and perspectives"

I. Suzuki, T. Omata
Semicond. Sci. Technol. 32, 013007(2017)

10. "First-principles study of CuGaO2 polymorphs: Delafossite α-CuGaO2 and wurtzite β-CuGaO2"

I. Suzuki, H. Nagatani, M. Kita, Y. Iguchi, C. Sato, H. Yanagi, N. Ohashi, T. Omata
Inorg. Chem. 55, 7610−7616(2016)

9. "First principles calculations of ternary wurtzite β-CuGaO2"

I. Suzuki, H. Nagatani, M. Kita, Y. Iguchi, C. Sato, H. Yanagi, N. Ohashi, T. Omata
J. Appl. Phys. 119, 095701 (2016)

8. "Wurtzite-derived ternary I-III-O2 semiconductors"

T. Omata, H. Nagatani, I. Suzuki, M. Kita
Sci. Technol. Adv. Mater. 16, 024902 (2015)

7. "Widely bandgap tunable amorphous Cd-Ga-O oxide semiconductors exhibiting electron mobilities ≥10 cm2V−1s−1"

H. Yanagi, C. Sato, Y. Kimura, I. Suzuki, T. Omata, T. Kamiya, H. Hosono
Appl. Phys. Lett. 106, 082106 (2015)

6. "Structural and thermal properties of a ternary narrow gap oxide semiconductor; wurtzite-derived β-CuGaO2"

H. Nagatani, I. Suzuki, M. Kita, M. Tanaka, Y. Katsuya, O. Sakata, S. Miyoshi, S. Yamaguchi, T. Omata
Inorg. Chem. 54, 1698−1704 (2015)

5. "Structure of β-AgGaO2; ternary I-III-VI2 oxide semiconductor with a wurtzite-derived structure"

H. Nagatani, I. Suzuki, M. Kita, M. Tanaka, Y. Katsuya, O. Sakata and T. Omata
J. Solid State Chem. 222, 66–70 (2015)

4. "Wurtzite CuGaO2: A direct and narrow band gap oxide semiconductor applicable to solar cell absorber"

T. Omata, H. Nagatani, I. Suzuki, M. Kita, H. Yanagi and N. Ohashi,
J. Am. Chem. Soc. 136, 3378-3381 (2014)

3. "Pseudo-Binary Alloying System of ZnO-AgGaO2 Reducing the Energy Band Gap of Zinc Oxide"

I. Suzuki, H. Nagatani, Y. Arima, M. Kita and T. Omata,
Appl. Phys. Lett. 103, 222107 (2013)

2. "Fabrication of β-AgGaO2 thin film by rf-magnetron sputtering"

I. Suzuki, H. Nagatani, Y. Arima, M. Kita and T. Omata,
Thin Solid Films, 559, 112-115 (2013)

1. "Fabrication of ZnF2 Thin Films and Their Vacuum Ultraviolet Transparency"

I. Suzuki, T. Omata, Y. Shiratsuchi, R. Nakatani, N. Kitamura, S. Otsuka-Yao-Matsuo,
Thin Solid Films, 534, 508-514 (2013)

Conference talks

Talks to come

Previous talks (International conf. only)

I. Suzuki, K. Washizu, M. Kita, T.Omata, "Synthesis of solar-cell absorber β-CuGaO2 by ion exchange of β-LiGaO2", STAC-D2MatE 2024, Tsukuba, Japan, Feb 29 2024 (Poster)
I. Suzuki, T. Omata, "DFT prediction and experimental verification of possibility of ion-exchange reactions in wurtzite-type ternary oxide semiconductors applicable to optoelectronic devices in a wide wavelength regions", MRM2023/IUMRS-ICA2023, Kyoto, Japan, Dec 12 2023 (Oral)
R. Fujimaru, I. Suzuki, T. Omata, M. Kita "Evaluation of electrical characteristics of Cu3VO4 thin film deposited by ultrasonic spray pyrolysis", STI-Gigaku, Nagaoka, Japan, Nov 6, 2023 (Poster)
S. Izumi, M. Inoue, T. Homma, I. Suzuki, T. Omata, M. Kita "Band gap engineering of Cu2ZnGeO4 with wurtzite-related structure", STI-Gigaku, Nagaoka, Japan, Nov 6, 2023 (Poster)
S. Igarashi, I. Suzuki, T. Omata, M. Kita "Synthesis of β-CuGaO₂ thin films by cation-exchange in alcohol", STI-Gigaku, Nagaoka, Japan, Nov 6, 2023 (Poster)
T. Ishiyama, Y. Yamada, H. Nagashima, I. Suzuki, M. Fujioka, M. Ono, T. Omata, J. Nishii "Suppression of proton migration by SiO6 in phosphate glasses and its mitigation by AlO6 substitution", Solid State Proton Conductors (SSPC-21), Fukuoka, Japan, Sep 18, 2023 (Oral)
I. Suzuki, S. Kawanishi, S. R. Bauers, A. Zakutayev, M. Kim, H. Yanagi, T. Omata "N-type SnS and its application to homojunction solar cells", PVSEC-33, Nagoya, Japan, Nov 16, 2022 (Poster)
T. Omata, A. Sharma, I. Suzuki, T. Ishiyama, J. Nishii "Proton Conductivity and Thermal Stability of Anhydrous Silico- and Germano-Phosphoric Acid Glasses", 23rd International Conference on Solid State Ionics (SSI-23), Boston, USA, July 19, 2022 (Oral)
I. Suzuki, B. Huang, S. Kawanishi, T. Omata, A. Klein "Close to energy gap band bending at SnS interface", E-MRS 2022 Spring Meeting, Online, 2 June, 2022 (Oral)
I. Suzuki, S. Kawanishi, S. R. Bauers, A. Zakutayev, B. Huang, Z. Lin, H. Shibata, A. Klein, H. Yanagi, T. Omata "N-type SnS and its application to homojunction PV", 2022 MRS Spring Meeting & Exhibit, Online, May 23, 2022 (Invited, Oral)
I. Suzuki, S. Kawanishi, S.R. Bauers, A. Zakutayev, H. Shibata, M. Kim, H. Yanagi, T. Omata “N-type conduction in Cl-doped SnS thin film“, Materials Research Meeting 2021, Yokohama, Japan, December 14, 2021 (Oral)
T. Omata, I. Suzuki, A. Sharma,T. Kinoshita,T. Ishiyama, S. Kohara, T. Yamashita, H. Kawazoe, T. Fang, Y. Ren, M. Fujioka, M. Ono, G. Zhao, J. Nishii, “Understanding the effect of oxide components on proton mobility in phosphate glasses; statistical analysis and experimental studies“, Solid State Proton Conductors (SSPC-20), Online, October 1, 2021 (Oral)
S. Kawanishi, I. Suzuki, T. Omata, H. Shibata, “Solution growth of large single crystals of n type tin monosulfide“, ACCGE-22/OMVPE-20, Online, August 3, 2021 (Oral)
I. Suzuki, S. Kawanishi, S.R. Bauers, A. Zakutayev, H. Shibata, M. Kim, H. Yanagi, T. Omata, “N-Type SnS Thin Films Applicable for Homojunction Solar Cells”, 2021 Virtual MRS Spring Meeting & Exhibit, Online, April 18, 2021 (Oral)
I. Suzuki, S. Kawanishi, S.R. Bauers, A. Zakutayev, H. Shibata, H. Yanagi, T. Omata, “Fabrication of pn Homojunction of SnS and Its Photovoltaic Properties”, 2021 Virtual MRS Spring Meeting & Exhibit, Online, April 18, 2021 (Poster)
A. Klein, D. Moritz, K. Schuldt, I. Suzuki, “About the difficulties to achieve high photovoltages and conversion efficiencies with CuO and other Cu oxides”, Virtual Chalcogenide PV Conference 2020, Online, May 26, 2020 (Oral)
H. Yanagi, Y. Iguchi, K. Sato, K. Inoue, I. Suzuki, S. Kawanishi, “Growth of Halogen Doped n-Type SnS Single Crystals Using Self-Flux", Materials Research Meeting 2019, Yokohama, Japan, December 12, 2019 (Poster)
I. Suzuki, S. Kawanishi, Y. Iguchi, K. Sato, T. Omata, H. Yanagi, “Cl-doped SnS single crystal and its n-type conduction”, 2019 MRS Fall Meeting & Exhibit, Boston, USA, December 4, 2019 (Poster)
T. Watanabe, S. Suzuki, I. Suzuki, T. Omata, “Development of Mist-CVD Equipment for β-NaGaO2 Thin-Film Deposition”, TAIPEI TECH-IMRAM Symposium 2019, Sendai, Japan, November 26, 2019 (Poster)
H. Yanagi, Y. Iguchi, K. Sato, S. Kawanishi, I. Suzuki, “Growth of Cl-doped n-type SnS single crystals and their electrical properties” The 5th International Conference on Advanced Electromaterials, Jeju, Korea, November 6, 2019 (Oral)
M. Kita, I. Suzuki, N. Wada, T. Omata, “Phase transformations of the narrow gap oxide semiconductor Cu2ZnGeO4 with wurtzite-derived structure in Ar atmosphere” The 13th Pacific Rim Conference of Ceramic Societies (PACRIM13), Okinawa, Japan, October 28, 2019 (Poster)
I. Suzuki, B. Huang, A. Klein, T. Omata, “Band alignment and Fermi level shift of β-CuGaO2” The 11th International Symposium on Transparent Oxide and Related Materials for Electronics and Optics (TOEO-11), Nara, Japan, October 7, 2019 (Poster)
M. Onaka, S. Kawanishi, I. Suzuki, H. Yanagi, “Effects of Cl implantation to SnS thin films” The 11th International Symposium on Transparent Oxide and Related Materials for Electronics and Optics (TOEO-11), Nara, Japan, October 7, 2019 (Poster)
B. Huang, K. Schuldt, N. Bein, I. Suzuki, A. Klein, “Energy band alignment and electrical properties of ferroelectrics” Joint ISAF-ICE-EMF-IWPM-PFM meeting 2019, Lausanne, Switzerland, July 18, 2019 (Poster)
I. Suzuki, N. Ohashi, A. Klein, T. Omata, “Electronic structure and band alignment of ternary wurtzite-type oxide semiconductor, β-CuGaO2” The 11th International Conference on the Science and Technology for Advanced Ceramics (STAC-11), Tsukuba, Japan, July 9, 2019 (Oral)
A. Klein, I. Suzuki, B. Huang, K. Schuldt, C.C. Chavarria, “The Fermi energy in acceptor doped SrTiO3 and BaTiO3” Nonstoichiometric Compounds VII, Miyazaki, Japan, March 11, 2019 (Poster)
I. Suzuki, “Novel candidate for solar cell absorber: Ternary wurtzite-type β-CuGaO2” Research seminar at National Renewable Energy Laboratory (NREL), Colorado, USA, December 11, 2018 (Oral)
I. Suzuki, H. Nagatani, M. Kita, T. Omata, “Fabrication of β-CuGaO2 Thin Films”, 10th International Workshop on Zinc Oxide and Other Oxide Semiconductors (IWZnO 2018), Warsaw, Poland, September 12, 2018 (Poster)
I. Suzuki, H. Nagatani, S. Takemura, M. Kita, T. Omata, “Conductivity Control of Ternary Wurtzite β-AgGaO2 by Impurity Doping”, 10th International Workshop on Zinc Oxide and Other Oxide Semiconductors (IWZnO 2018), Warsaw, Poland, September 12, 2018 (Poster)
M. Kita, I. Suzuki, N. Wada, T. Omata, “"Cu deficiency in the narrow gap oxide semiconductor Cu2ZnGeO4 with wurtzite-derived structure"”, 10th International Workshop on Zinc Oxide and Other Oxide Semiconductors (IWZnO 2018), Warsaw, Poland, September 12, 2018 (Poster)
I. Suzuki, A. Klein, T. Omata, “ XPS study of the band alignment of β-CuGaO2 with other oxides”, Data Science in Life Science and Engineering Collaboration and Symposium, 5th CWRU-Tohoku Joint Workshop, Sendai, Japan, August 3, 2018 (Poster)
B. Huang, I. Suzuki, R. Giesecke, A. Klein,” The influence of electrode material on the resistance degradation of Fe-doped SrTiO3”, Electroceramics XVI, Hasselt, Belgium, July 9, 2018 (Poster)
I. Suzuki, A. Klein, “Direct observation of the Fe impurity levels in BaTiO3 single crystal by electrical measurement”, 2017 MRS Fall Meeting & Exhibit, Boston, USA, November 30, 2017 (Oral)
M. Kita, I. Suzuki, M. Inoue, T. Omata, “Crystal and electronic structure of quaternary narrow gap oxide semiconductor Cu2ZnGeO4 with a wurtzite-derived structure”, 2017 MRS Fall Meeting & Exhibit, Boston, USA, November 28, 2017 (Poster)
R. Giesecke, B. Huang, I. Suzuki, A. Klein, “Modification of Schottky barrier heights during resistance degradation of Fe-doped SrTiO3”, 21st International Conference on Solid State Ionincs, Padua, Italy, June 20, 2017 (Oral)
A. Kakinuma, I. Suzuki, M. Ueda, T. Omata, “Flux grouwth of ternary wurtzite β-NaGaO2 and β-LiGaO2 single crystals”, 9th International Workshop on Zinc Oxide and Related Materials (IWZnO 2016), Taipei, Taiwan, November 1, 2016 (Oral)
T. Omata, H. Nagatani, Y. Mizuno, I. Suzuki, M. Kita, N. Ohashi, “Band gap engineering of wurtzite β-CuGaO2 by alloying with β-CuAlO2 and β-LiGaO2 and their electronic structures”, 9th International Workshop on Zinc Oxide and Related Materials (IWZnO 2016), Taipei, Taiwan, November 1, 2016 (Oral)
M. Kita, I. Suzuki, H. Nagatani, Y. Mizuno, M. Inoue, T. Omata, “New quaternary narrow gap oxide semiconductor Cu2ZnGeO4 with a wurtzite-derived structure”, 9th International Workshop on Zinc Oxide and Related Materials (IWZnO 2016), Taipei, Taiwan, November 1, 2016 (Poster)
H. Nagatani, I. Suzuki, M. Kita,T. Omata, “Control of electrical conductivity of ternary wurtzite β-AgGaO2”, 9th International Workshop on Zinc Oxide and Related Materials (IWZnO 2016), Taipei, Taiwan, October 30, 2016 (Poster)
T. Omata, Y. Mizuno, I. Suzuki, H. Nagatani, M. Kita, “Ternary and quaternary wurtzite-type oxide semiconductors: b -CuGaO2 and its related materials”, Compound Semiconductor Week 2016, Toyama, Japan, June 30, 2016 (Oral)
I. Suzuki, H. Nagatani, M. Kita, T. Omata, “Fabrication of β-CuGaO2 thin films; An oxide thin-film solar cell absorber”, 2015 MRS Fall Meeting & Exhibit, Boston, USA, December 2, 2015 (Oral)
I. Suzuki, H. Nagatani, M. Kita, T. Omata, “Fabrication of β-CuGaO2 thin films; An oxide thin-film solar cell absorber”, The 9th International Conference on the Science and Technology for Advanced Ceramics (STAC-9) and the 9th Symposium on Transparent Oxide and Related Materials for Electronics and Optics (TOEO-9), Tsukuba, Japan, October 20, 2015 (Poster)
A. Kakinuma, I. Suzuki, M. Ueda, T. Omata, "Flux growth of β-NaGaO2 single crystals and their ion-exchange to fabricate β-CuGaO2 and β-AgGaO2", The 9th International Conference on the Science and Technology for Advanced Ceramics (STAC-9) and the 9th Symposium on Transparent Oxide and Related Materials for Electronics and Optics (TOEO-9), Tsukuba, Japan, October 20, 2015 (Poster)
Y. Mizuno, H. Nagatani, I. Suzuki, M. Kita, T. Omata, “Band gap engineering of wurtzite-type narrow band gap semiconductor β-CuGaO2”, The 9th International Conference on the Science and Technology for Advanced Ceramics (STAC-9) and the 9th Symposium on Transparent Oxide and Related Materials for Electronics and Optics (TOEO-9), Tsukuba, Japan, October 20, 2015 (Poster)
I. Suzuki, H. Nagatani, M. Kita, H. Yanagi, T. Omata, “Novel ternary wurtzite semiconductor β-CuGaO2”, 17th International Conference on II-VI Compounds and Related Materials, Paris, France, September 15, 2015 (Oral)
I. Suzuki, H. Nagatani, M. Kita, T. Omata, “Fabrication of β-CuGaO2 thin films”, 17th International Conference on II-VI Compounds and Related Materials, Paris, France, September 15, 2015 (Poster)
I. Suzuki, H. Nagatani, M. Kita, H. Yanagi, N. Ohashi, T. Omata, “Novel ternary wurtzite-type semiconductor, β-CuGaO2”, 2014 MRS Fall Meeting & Exhibit, Boston, USA, December 3, 2014 (Oral)
I. Suzuki, H. Nagatani, M. Kita, H. Yanagi, N. Ohashi, T. Omata, “First principle calculations of　wurtzite β-CuGaO2 and β-AgGaO2”, 2014 MRS Fall Meeting & Exhibit, Boston, USA, December 1, 2014 (Poster)
I. Suzuki, Y. Arima, M. Kita, T. Omata, “Band gap narrowing of ZnO by alloying with β-AgGaO2”, 8th International Workshop on Zinc Oxide and Related Materials (IWZnO 2014), Niagara Falls, Canada, September 9, 2014 (Poster)
I. Suzuki, H. Nagatani, M. Kita, Y. Iguchi, C. Sato, H. Yanagi, N. Ohashi, T. Omata, “First principle calculation of electronic band structure of wurtzite β-CuGaO2 and β-AgGaO2”, 8th International Workshop on Zinc Oxide and Related Materials (IWZnO 2014), Niagara Falls, Canada, September 8, 2014 (Poster)
H. Nagatani, I. Suzuki, M. Kita, H. Yanagi, N. Ohashi, T. Omata, “A new ternary oxide semiconductor; Wurtzite CuGaO2”, 8th International Workshop on Zinc Oxide and Related Materials (IWZnO 2014), Niagara Falls, Canada, September 8, 2014 (Poster)
I. Suzuki, H. Nagatani, M. Kita, Y. Iguchi, C. Sato, H. Yanagi, N. Ohashi, T. Omata, “First principle calculations of electronic band structures of wurtzite β-CuGaO2 and β-AgGaO2”, The 3rd International Seminar: International Workshop on Green Energy Conversion, Yamanashi, Japan, August 25, 2014 (Poster)
H. Nagatani, I. Suzuki, M. Kita, H. Yanagi, N. Ohashi, T. Omata, “A new direct and narrow band gap oxide semiconductor; Wurtzite CuGaO2”, The 3rd International Seminar: International Workshop on Green Energy Conversion, Yamanashi, Japan, August 25, 2014 (Poster)
Y. Mizuno, H. Nagatani, I. Suzuki, M. Kita, T. Omata, “Band gap engineering of wurtzite-derived CuGaO2 with CuAlO2”, The 3rd International Seminar: International Workshop on Green Energy Conversion, Yamanashi, Japan, August 25, 2014 (Poster)
I. Suzuki, H. Nagatani, M. Kita, Y. Iguchi, C. Sato, H. Yanagi, N. Ohashi, T. Omata, “First principle calculations of electronic band structures of wurtzite β-CuGaO2 and β-AgGaO2”, The Eighth International Conference on the Science and Technology for Advanced Ceramics (STAC8), Yokohama, Japan, June 26, 2014 (Poster)
H. Nagatani, I. Suzuki, M. Kita, H. Yanagi, N. Ohashi, T. Omata, “A new direct and narrow band gap oxide semiconductor; Wurtzite CuGaO2”, The Eighth International Conference on the Science and Technology for Advanced Ceramics (STAC8), Yokohama, Japan, June 26, 2014 (Poster)
I. Suzuki, Y. Arima, M. Kita, T. Omata, “Band gap engineering of ZnO by alloying with β-AgGaO2”, The 2nd International Seminar: International Workshop on Green Energy Conversion, Nagano, Japan, September 2, 2013 (Poster)
C. Sato, H. Yanagi, I. Suzuki, T. Omata, T. Kamiya, H. Hosono, “Band-gap engineering of high mobility amorphous oxide semiconductor, a-Cd-Ga-O”, The 2nd International Seminar: International Workshop on Green Energy Conversion, Nagano, Japan, September 2, 2013 (Poster)
I. Suzuki, Y. Arima, M. Kita, T. Omata, “Band gap narrowing of ZnO by alloying with β-AgGaO2”, 8th International Symposium on Transparent Oxide and Related Materials for Electronics and Optics (TOEO8), Tokyo, Japan, May 15, 2013 (Oral)
C. Sato, H. Yanagi, I. Suzuki, T. Omata, T. Kamiya, H. Hosono, “Band-gap control in amorphous oxide semiconductor Cd-Ga-O thin films”, 2013 MRS Spring Meeting & Exhibit, California, USA, April 3, 2013 (Oral)
I. Suzuki, Y. Arima, M. Kita, T. Omata, “New pseudo-binary alloy system of x(AgGaO2)1/2—(1-x)ZnO for band gap narrowing of ZnO”, 2013 MRS Spring Meeting & Exhibit, California, USA, April 2, 2013 (Poster)
I. Suzuki, T. Omata, Y. Shiratsuchi, R. Nakatani, S. Otsuka-Yao-Matsuo, “Fabrication of ZnF2 thin film and their transparency in vacuum ultraviolet”, IUMRS-ICA 12th International Conference in Asia, Taipei, Taiwan, September 11, 2011 (Poster)

Other activities and achievements

Press release

Committee and referee

Program committee & session Chair at MNC2019
Editor of High Temp. Mater. Process.
Referee for Journals: J. Mater. Sci. / J. Appl. Phys. / Chem. Sci. / Inorg. Chem. / Opt. Mater. / Superlattices and Microstruct. / and etc...

Funding (as a representative researcher only)

2022: Grant-in-Aid for Challenging Research (Exploratory)
2021: Grant-in-Aid for Scientific Research (B)
2020: The Murata Science Foundation
2019: Grant-in-Aid for Young Scientists
2016: JSPS overseas research fellow
2014: JSPS research fellow (DC2)

Patent

2020: n-type SnS thin films (JPN patent apl. 2020-108143)
2019: Arsenate compound (JPN patent apl. 2019-043850)
2013: β-CuGaO2 (JPN patent apl. 2013-66037)
2012: Band gap narrowing of ZnO (JPN patent apl. 2012-265431)

Honors and awards

Presentation Award: I. Suzuki, N. Ohashi, A. Klein, T. Omata"Electronic structure and band alignment of β-CuGaO2"The 38th workshop of electroceramics, Kawasaki, Japan (2018)
Silver Poster Award: I. Suzuki, H. Nagatani, M. Kita and T. Omata“Fabrication of β-CuGaO2 Thin Films; An Oxide Thin-Film Solar Cell Absorber”TOEO-9, Tsukuba, Japan (2015)
MRS Poster Award Nominee（MRS fall meeting, Boston, US (2014)