鈴木 一誓  IsseI Suzuki 

東北大学 多元物質科学研究所 小俣研究室
講師・博士(工学)
1987年生 東京都練馬区出身

Google scholar, Researchmap, ResearchGate

issei.suzuki [at] tohoku.ac.jp

こんにちは、鈴木です。SNS全盛ですが、古くさいホームページもいいなと思って作りました。
なにかございましたら上記のメールアドレス宛か、ResearchGateのメッセージでご連絡ください。

 研究テーマ

2011年から無機化合物の研究に携わっています。

研究キーワード:無機化合物 / β-CuGaO2, β-AgGaO2, β-LiGaO2 / 硫化錫(SnS)/ プロトン伝導体 /
イオン交換反応 / 第一原理計算 / 太陽電池 / 界面電子状態 / XPS

新しい酸化物半導体の合成

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 in (link).

n型SnSとその太陽電池への応用

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. 

中温作動型燃料電池の電解質および電極材料

Intermediate temperature fuel cells (PEFCs) is expected as the next-generation energy source. I have been working on the electrolyte and electrode for protonic fuel cells since 2018. 

新規無機化合物の第一原理計算

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.

界面における電子状態のXPSによる解析

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.

経歴

職歴

学歴

論文リスト

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

I. Suzuki, M. Kita, T. Omata
Chem. Mater., (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)

学会発表リスト(国内会議)

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