Professor, 2014.1-present, Department of Applied Physics, The University of Tokyo

Principal Research Manager, 2014.1-2019.3, Flexible Electronics Research Center (FLEC), AIST

Deputy Director, 2011.4-2013.12 Flexible Electronics Research Center (FLEC) , AIST

Group Leader, 2008.4-2011.3, Correlated Materials Photoelectronics Group, Photonics
Research Institute (PRI), AIST

Team Leader (2004.4-2008.3) & Senior Research Scientist (2003.3-2008.3),
Correlated Electron Research Center (CERC), AIST, Japan

Visiting Researcher, 2001.11-2002.8, Solid State Physics Laboratory, ETH Zurich,
Switzerland

Associate Professor, 1997.9-2003.2, Research Institute for Electronic Science, Hokkaido
University, Japan

Research Associate, 1992.1-1997.2, The University of Tokyo, Japan

Ph. D., 1988.4-1991.12, Department of Applied Physics, The University of
Tokyo, Japan

1. Keito Murata, Gyo Kitahara, Satoru Inoue, Toshiki Higashino, Satoshi Matsuoka, Shunto Arai, Reiji Kumai, Tatsuo Hasegawa. Stability of ternary interfaces and its effects on ideal switching characteristics in inverted coplanar organic transistors. Physical Review Applied.  21. 2(2024).

2. Satoru Inoue, Toshiki Higashino, Kiyoshi Nikaido, Ryo Miyata, Satoshi Matsuoka, Mutsuo Tanaka, Seiji Tsuzuki, Sachio Horiuchi, Ryusuke Kondo, Ryoko Sagayama, Reiji Kumai, Daiki Sekine, Takayoshi Koyanagi, Masakazu Matsubara, Tatsuo Hasegawa. Control of Polar/Antipolar Layered Organic Semiconductors by the Odd-Even Effect of Alkyl Chain. Advanced Science.(2024).

3. Toshiki Higashino, Satoru Inoue, Shunto Arai, Seiji Tsuzuki, Hiroyuki Matsui, Reiji Kumai, Kiyofumi Takaba, Saori Maki-Yonekura, Hirofumi Kurokawa, Ichiro Inoue, Kensuke Tono, Koji Yonekura, and Tatsuo Hasegawa. Effects of Thiophene-Fused Isomer on High-Layered Crystallinity in π-Extended and Alkylated Organic Semiconductors. Chemistry of Materials. 36. 2. 848-859(2024).

4. Yohei Uemura, Satoshi Matsuoka, Shunto Arai, Jun Harada, and Tatsuo Hasegawa, "Intersecting multiaxial domain walls in plastic ferroelectric crystal films",Phys. Rev. Materials 7, 035601 (2023).

5. Shunto Arai, Satoru Inoue, Mutsuo Tanaka, Seiji Tsuzuki, Ryusuke Kondo, Reiji Kumai, and Tatsuo Hasegawa, "Temperature-induced transformation between layered herringbone polymorphs in molecular bilayer organic semiconductors",Phys. Rev. Materials 7, 025602 (2023).

6. Yudai Hemmi, Yuji Ikeda, Radu A. Sporea, Satoru Inoue, Tatsuo Hasegawa, and Hiroyuki Matsui, ”Printed 700 V/V gain amplifiers based on organic source‐gated transistors with field plates”, Adv. Electron. Mater., (early view 2201263)(2023).

7. N. Takamura, T. Miyamoto, S. Liang, K. Asada, T. Terashige, Y. Takahashi, T. Hasegawa, and H. Okamoto, "Efficient Mott insulator-metal transition by an intense terahertz electric field pulse via quantum tunneling", Phys. Rev. B 107, 085147 (2023).

8. Yu Dong, Ming-Min Yang, Mao Yoshii, Satoshi Matsuoka, Sota Kitamura, Tatsuo Hasegawa, Naoki Ogawa, Takahiro Morimoto, Toshiya Ideue, and Yoshihiro Iwasa, ”Giant bulk piezophotovoltaic effect in 3R-MoS2”, Nature Nanotech. 18, 36-41 (2023).

9. 長谷川 達生、井上 悟「層状結晶性有機半導体による塗布型トランジスタの高急峻スイッチング」,応用物理 2022年91巻10号 p.613-618., (2022).

10. Tatsuo Hasegawa and Satoru Inoue, "Extremely sharp switching operation of printed transistors using highly layered crystalline organic semiconductors", (Tutorial Review) [Open access]JSAP Review vol.2022, (2022).

11. S. Matsuoka, K. Ogawa, R. Ono, K. Nikaido, S. Inoue, T. Higashino, M. Tanaka, J. Tsutsumi, R. Kondo, R. Kumai, S. Tsuzuki, S. Arai, T. Hasegawa, "Highly stable and isomorphic donor–acceptor stacking in a family of n-type organic semiconductors of BTBT-TCNQ derivatives", J. Mater. Chem. C 10, 16471-16479 (2022).

12. K. Nikaido, S. Inoue, R. Kumai, T. Higashino, S. Matsuoka, S. Arai, T. Hasegawa, "Mixing-Induced Orientational Ordering in Liquid-Crystalline Organic Semiconductors",Adv. Mater.Interfaces , 34, 72-83 (2022).

13. Miyata, S. Inoue, K. Nakajima, T. Hasegawa, ”Insulating Polymer Blend Organic Thin-Film Transistors Based on Bilayer-Type Alkylated Benzothieno[3,2-b]naphtho[2,3-b]thiophene”, ACS Appl. Mater.Interfaces 14, 17719–17726 (2022).

14. S. Inoue, K. Nikaido, T. Higashino, S. Arai, M. Tanaka, R. Kumai, S. Tsuzuki, S. Horiuchi, H. Sugiyama, Y. Segawa, K. Takaba, S. Maki-Yonekura, K. Yonekura, T. Hasegawa, ”Emerging Disordered Layered-Herringbone Phase in Organic Semiconductors Unveiled by Electron Crystallography”, Chem. Mater., (2021).

15. S. Matsuoka, J. Tsutsumi, T. Hasegawa, ”Giant Enhancement of Excitonic Electro-optic Response in Trap-Reduced Organic Transistors”, Phys. Rev. Applied 16, 044043;1-8 (2021).

16. G. Kitahara, M. Ikawa, S. Matsuoka, S. Arai, T. Hasegawa, ”Approaching Trap-Minimized Polymer Thin-Film Transistors”,Adv. Funct. Mater. 2105933;1-11 (2021).

17. H. Matsui, E. Takahashi, S. Tsuzuki, K. Takimiya, T. Hasegawa, “Field-Induced Electron Spin Resonance of Site-Selective Carrier Accumulation in Field-Effect Transistors Composed of Organic Semiconductor Solid Solutions”, ,Phys. Rev. Applied 16,034019;1-8 (2021) .

18. T. Higashino, S. Inoue, S. Arai, H. Matsui, N. Toda, S. Horiuchi, R. Azumi, T. Hasegawa, ”Architecting Layered Crystalline Organic Semiconductors Based on Unsymmetric π-Extended Thienoacenes”,Chem. Mater. 33 ,7379-7385 (2021) .

19. T. Hayashida, Y. Uemura, K. Kimura, S. Matsuoka, M. Hagihala, S. Hirose, H. Morioka, T. Hasegawa, and T. Kimura, ”Phase transition and domain formation in ferroaxial crystals”, Phys. Rev. Mater. 5, 124409 (2021).

20. T. Yamaguchi, K. Iwano, T. Miyamoto, N. Takamura, N. Kida, Y. Takahashi, T. Hasegawa, H. Okamoto, ”Excitonic optical spectra and energy structures in a one-dimensional Mott insulator demonstrated by applying a many-body Wannier functions method to a charge model”, Phys. Rev. B 103, 045124 (2021).

21. G. Kitahara, S. Inoue, T. Higashino, M. Ikawa, T. Hayashi, S. Matsuoka, S. Arai, and T. Hasegawa, “Meniscus-controlled printing of single-crystal interfaces showing extremely sharp switching transistor operation”, Science Advances 6,eabc8847:1-10 (2020).

22. T. Hayashida, Y. Uemura, K. Kimura, S. Matsuoka, D. Morikawa, S. Hirose, K. Tsuda, T. Hasegawa, and T. Kimura, “Visualization of ferroaxial domains in an order-disorder type ferroaxial crystal”, Nature Commun. 11,4582:1-8 (2020).

23. Y. Uemura, S. Matsuoka, J. Tsutsumi, S. Horiuchi, S. Arai, and T. Hasegawa, “Birefringent Field-Modulation Imaging of Transparent Ferroelectrics”, Phys. Rev. Appl. 14, 024060:1-8 (2020).

24. T. Hayashi, Y. Hirakawa, S. Inoue, S. Arai, and T. Hasegawa, “Anomalous Hydrodynamic Size Distributions of Alkylamine/Alkylacid-Encapsulated Silver Nanocolloids: Implications for Printing Ultrafine Conductive Patterns”, ACS Appl. Nano Mater. 3, 6884-6891 (2020).

25. T. Hamai, S. Inoue, S. Arai, and T. Hasegawa, “Trap-state suppression and band-like transport in bilayer-type organic semiconductor ultrathin single crystals”, Phys. Rev. Mater. 4,074601:1-8 (2020).

26. T. Higashino, S. Arai, S. Inoue, S. Tsuzuki, Y. Shimoi, S. Horiuchi, T. Hasegawa, R. Azumi, “Architecting layered molecular packing in substituted benzobisbenzothiophene (BBBT) semiconductor crystals”, CrystEngComm 22,3618-3626 (2020).

27. S. Arai, K. Morita, J. Tsutsumi, S. Inoue, M. Tanaka, T. Hasegawa, “Layered‐Herringbone Polymorphs and Alkyl‐Chain Ordering in Molecular Bilayer Organic Semiconductors”, Adv. Funct. Mater. 30, 1906406 (2020).

28. G. Kitahara, S. Matsuoka, S. Arai, and T. Hasegawa, “Use of surface photo-reactive nanometal printing for polymer thin-film transistors: contact resistance and short-channel effects”, MRS commun. 1-5 (2019).

29. J. Harada, Y. Kawamura, Y. Takahashi, Y. Uemura, T. Hasegawa, H. Taniguchi, K. Maruyama, “Plastic/Ferroelectric Crystals with Easily Switchable Polarization: Low-Voltage Operation, Unprecedentedly High Pyroelectric Performance, and Large Piezoelectric Effect in Polycrystalline Forms”, J. Am. Chem. Soc. 141,9349-9357 (2019).

30. Y. Hirakawa, K. Aoshima, S. Arai, and T. Hasegawa, “Phase and Dispersion Stability of Silver Nanocolloids for Nanoparticle-Chemisorption Printing”, ACS Appl. Nano Materials. 2,4342-4349 (2019).

31. T. Higashino, S. Inoue, Y. Sadamitsu, S. Arai, S. Horiuchi, and T. Hasegawa, “Bilayer-type Layered Herringbone Packing in 3-n-Octyl-9-phenyl-benzothieno[3,2-b]naphtho[2,3-b]thiophene”, Chem. Lett. 48, 453-456 (2019).

32. Y. Uemura, S. Arai, J. Tsutsumi, S. Matsuoka, H. Yamada, R. Kumai, S. Horiuchi, A. Sawa, and T. Hasegawa, “Field-Modulation Imaging of Ferroelectric Domains in Molecular Single-Crystal Films”, Phys. Rev. Applied 11, 014046:1-9 (2019).

33. S. Arai, S. Inoue, T. Hamai, R. Kumai, and T. Hasegawa, “Semiconductive single molecular bilayers realized using geometrical frustration”, Adv. Mater. 30,1707256:17 (2018).

34. S. Inoue, S. Shinamura, Y. Sadamitsu, S. Arai, S. Horiuchi, M. Yoneya, K. Takimiya, and T. Hasegawa, “Extended and Modulated Thienothiophenes for Thermally Durable and Solution-Processable Organic Semiconductors”, Chem. Mater. 30, 5050-5060 (2018).

35. K. Aoshima, Y. Hirakawa, T. Togashi, M. Kurihara, S. Arai, and T. Hasegawa, “Unique coexistence of dispersion stability and nanoparticle chemisorption in alkylamine/alkylacid encapsulated silver nanocolloids”, Sci. Rep. 8, 6133:1-9 (2018).

36. S. Matsuoka, J. Tsutsumi, T. Kamata, and T. Hasegawa, “Microscopic gate-modulation imaging of charge and field distribution in polycrystalline organic transistors”, J. Appl. Phys. 123, 135301:111 (2018).

37. J. Tsutsumi, S. Matsuoka, T. Kamata, T. Hasegawa, “Fast optical inspection of operations of large-area active-matrix backplane by gate modulation imaging”, Org. Electron. 55, 187193 (2018).

38. S. Matsuoka, J. Tsutsumi, H. Matsui, T. Kamata, and T. Hasegawa, “Nanosecond time-resolved microscopic gate-modulation imaging of polycrystalline organic thin-film transistors”, Phys. Rev. Applied 9, 024025:110 (2018).

39. T. Hamai, S. Arai, H. Minemawari, S. Inoue, R. Kumai, and T. Hasegawa, “Tunneling and origin of large access resistance in layered-crystal organic transistors”, Phys. Rev. Applied 8, 054011:112 (2017).

40. G. Kitahara, K. Aoshima, J. Tsutsumi, H. Minemawari, S. Arai and T. Hasegawa, “Low-voltage operation of organic thin-film transistors based on ultrafine printed silver electrodes”, Org. Electron. 50, 426428 (2017).

41. M. Yoneya, H. Minemawari, T. Yamada, and T. Hasegawa, “Interface-mediated self-assembly in inkjet printing of single-crystal organic semiconductor films”, J. Phys. Chem. C 121, 87968803 (2017).

42. H. Minemawari, M. Tanaka, S. Tsuzuki, S. Inoue, T. Yamada, R. Kumai, Y. Shimoi, and T. Hasegawa, “Enhanced layered-herringbone packing due to long alkyl chain substitution in solution-processable organic semiconductors”, Chem. Mater. 29, 12451254 (2017).

43. M. Yoneya, S. Matsuoka, J. Tsutsumi, and T. Hasegawa, “Self-assembly of donor–acceptor semiconducting polymers in solution thin films: a molecular dynamics simulation study”, J. Mater. Chem. C 5, 96029610 (2017).

44. J. Tsutsumi, S. Matsuoka, I. Osaka, R. Kumai, and T. Hasegawa, “Reduced exchange narrowing caused by gate-induced charge carriers in high-mobility donor-acceptor copolymers”, Phys. Rev. B 95, 115306:19 (2017).

45. K. Aoshima, S. Arai, K. Fukuhara, T. Yamada, and T. Hasegawa, “Surface modification of printed silver electrodes for efficient carrier injection in organic thin-film transistors”, Org. Electron. 41, 137142 (2017).

46. Y. Shibata, J. Tsutsumi, S. Matsuoka, H. Minemawari, S. Arai, R. Kumai, and T. Hasegawa, “Unidirectionally crystallized stable n-type organic thin-film transistors based on solution-processable donor-acceptor compounds”, Adv. Electron. Mater. 1700097:16 (2017).

47. T. Yamada, K. Fukuhara, K. Matsuoka, H. Minemawari, J. Tsutsumi, N. Fukuda, K. Aoshima, S. Arai, Y. Makita, H. Kubo, T. Enomoto, T. Togashi, M. Kurihara, and T. Hasegawa, “Nanoparticle chemisorption printing technique for conductive silver patterning with submicron resolution”, Nature Commun. 7, 11402:19 (2016).

48. Y. Noda, T. Yamada, K. Kobayashi, R. Kumai, S. Horiuchi, F. Kagawa, and T. Hasegawa, “Few-volt operation of printed organic ferroelectric capacitor”, Adv. Mater. 27, 64756481 (2015).

49. 堤潤也、松岡悟志、長谷川達生、「ゲート変調イメージングによる有機TFTアレイの一括評価技術」、応用物理 第85巻 No. 12, 10371041 (2016).

50. H. Koike, M. Chikamatsu, R. Azumi, J. Tsutsumi, K. Ogawa, W. Yamane, T. Nishiuchi, T. Kubo, T. Hasegawa, and K. Kanai, “Stable delocalized dinglet biradical hydrocarbon for organic field-effect transistors”, Adv. Funct. Mater. 26, 277283 (2016).

51. K. P. Goetz, J. Tsutsumi, S. Pookpanratana, J. Chen, N. S. Corbin, R. K. Behera, V. Coropceanu, C. A. Richter, C. A. Hacker, T. Hasegawa, and O. D. Jurchescu, “Polymorphism in the 1:1 charge-transfer complex DBTTF-TCNQ and its effects on optical and electronic properties”, Adv. Electron. Mater. 2, 1600203:110 (2016).

52. T. Hasegawa, “Physics of Organic Field Effect Transistors and the Materials”, Chap. 1 (p.141), in "Organic Electronics Materials and Devices" Ed: S. Ogawa (Springer Verlag, 2015).

53. J. Tsutsumi, S. Matsuoka, S. Inoue, H. Minemawari, T. Yamada and T.Hasegawa, "N-type field-effect transistors based on layered crystallinedonor-acceptor semiconductors with dialkylated benzothienobenzothiophenes as electron donors", J. Mater. Chem. C 3, 1976 (2015).

54. Y. Shibata, J. Tsutsumi, S. Matsuoka, K. Matsubara, Y. Yoshida, M. Chikamatsu and T. Hasegawa,“Uniaxially oriented polycrystalline thin films and air-stable n-type transistors based on donor-acceptor semiconductor (diC8BTBT)(FnTCNQ) [n = 0, 2, 4]”, Appl. Phys. Lett. 106, 143303:14 (2015).

55. Y. Noda, T. Yamada, K. Kobayashi, R. Kumai, S. Horiuchi, F. Kagawa, and T. Hasegawa, “Few-volt operation of printed organic ferroelectric capacitor”, Adv. Mater. 27, 64756481 (2015).

56. J. Tsutsumi, S. Matsuoka, T. Yamada, and T. Hasegawa, “Gate-modulation imaging of organic thin-film transistor arrays: Visualization of distributed mobility and dead pixels”, Org. Electron. 25, 289294 (2015).

57. S. Inoue, H. Minemawari, J. Tsutsumi, M. Chikamatsu, T. Yamada, S. Horiuchi, M. Tanaka, R. Kumai, M. Yoneya, and T. Hasegawa, “Effects of substituted alkyl chain length on solution-processable layered organic demiconductor crystals”, Chem. Mater. 27, 38093812 (2015).

58. Y. Noda, H. Minemawari, H. Matsui, T. Yamada, S. Arai, T. Kajiya, M. Doi, and T. Hasegawa,“Underlying mechanism of inkjet printing of uniform organic semiconductor films through antisolvent crystallization”, Adv. Funct. Mater. 25, 40224031 (2015).

59. J. Tsutsumi, T. Yamada and T. Hasegawa, "Electroabsorption study of charge-transfer excited state in donor-acceptor-type polymer", Trans. Mat. Res. Soc. Japan 39, 217 (2014).

60. J. Tsutsumi, H. Matsuzaki, N. Kanai, T. Yamada and T. Hasegawa, "Formation of relaxed charge-transfer excitons in donor-acceptor-type polymer solar cells", Jpn. J. Appl. Phys. 53, 05HB12 (2014).

61. 峯廻洋美、野田祐樹、山田寿一、長谷川達生、「有機半導体のダブルショット・インクジェット印刷技術」,化学工業（化学工業社）65巻 No.9、72-76 (2014).

62. H. Minemawari, T. Yamada and T. Hasegawa,"Crystalline film growth of TIPS-pentacene by double-shot inkjet printing technique",Jpn. J. Appl. Phys., 53, 05HC10 (2014).

63. H. Minemawari, J. Tsutsumi, S. Inoue, T. Yamada, R. Kumai and T. Hasegawa,"Crystal structure of asymmetric organic semiconductor 7-decyl-2-phenyl[1]benzothieno[3,2-b][1]benzothiophene",Applied Physics Express 7 091601(2014).

64. 長谷川達生、峯廻洋美、井川光弘、野田祐樹、山田寿一、「分子性半導体の印刷製造技術」, 固体物理 Vol. 49 No. 4, 205 (2014).

65. Y. Noda, H. Matsui, H. Minemawari, T. Yamada, and T. Hasegawa, “Observation and simulation of microdroplet shapes on surface-energy-patterned substrates: Contact line engineering for printed electronics”, J. Appl. Phys. 114, 044905:18 (2013).

66. 長谷川 達生、森 健彦 監修、「有機トランジスタ材料の評価と応用2」、シーエムシー出版 (2013/11).

67. 長谷川達生、「有機半導体の印刷製造技術」、応用物理 第82巻 No. 6, 493-496 (2013).

68. J. Tsutsumi, H. Matsuzaki, N. Kanai, T. Yamada, and T. Hasegawa, “Charge separation of charge-transfer excitons in donor-acceptor polymer solar cells”, J. Phys. Chem. 117, 1676916773 (2013).

69. J. Tsutsumi, H. Matsui, T. Yamada, R. Kumai, and T. Hasegawa, "Generation and Diffusion of Photocarriers in Molecular Donor-Acceptor Systems: Dependence on Charge-Transfer Gap Energy", J. Phys. Chem. C 116, 23957-23964 (2012).

70. Hiroyuki Matsui , Yuki Noda , and Tatsuo Hasegawa , "Hybrid Energy-Minimization Simulation of Equilibrium Droplet Shapes on Hydrophilic/Hydrophobic Patterned Surfaces ",Langmuir, 28 (44), pp 15450-15453,(2012).

71. M. Ikawa, T. Yamada, H. Matsui, H. Minemawari, J. Tsutsumi, Y. Horii, M. Chikamatsu, R. Azumi, R. Kumai, and T. Hasegawa, "Simple push coating of polymer thin-film transistors",Nat. Commun. 3:1176 doi: 10.1038/ncomms2190 (2012).

72. 長谷川達生、松井弘之、ミシェンコ アンドレイ「有機半導体界面における浅い局在状態密度分布のスペクトル解析」, 日本物理学会誌 第67巻 No. 10, p.695-699 (2012).

73. 松井弘之、長谷川達生「有機半導体における2 種類の運動による尖鋭化効果」, 電子スピンサイエンス学会誌 第10巻 Autumn Issue (19号) p82-87 (2012).

74. 長谷川達生、峯廻洋美、山田寿一「ダブルショット・インクジェット印刷による有機半導体の製造」, 未来材料 第12巻 No. 6, p.55-60 (2012).

75. H. Matsui, D. Kumaki, E. Takahashi, K. Takimiya, S. Tokito, and T. Hasegawa , "Correlation between interdomain carrier hopping and apparent mobility in polycrystalline organic transistors as investigated by electron spin resonance ", Phys. Rev. B 85.035308 (2012).

76. 堤潤也、長谷川達生, 「有機半導体における分子間電荷移動励起を用いた光電変換」, 固体物理 46巻 No. 6, 309 (2011).

77. H. Minemawari, T. Yamada, H. Matsui, J. Tsutsumi, S. Haas, R. Chiba, R. Kumai & T. Hasegawa ,　"Inkjet printing of single-crystal films", Nature , 475, 364-367 ( 2011).

78. S. Wall, D. Brida, S. R. Clark, H. P. Ehrke, D. Jaksch, A. Ardavan, S. Bonora, H. Uemura, Y. Takahashi, T. Hasegawa, H. Okamoto, G. Cerullo A. Cavalleri, “Quantum interference between charge excitation paths in a solid-state Mott insulator”, Nat. Phys. 7, 114118 (2011).

79. T. Hasegawa, M. Hiraoka, T. Yamada, "Double-shot inkjet printing of donor-acceptor-type organic charge-transfer complexes: Wet/nonwet definition and its use for contact engineering ", Thin Sol. Films 518, 14, 3988 (2010).

80. J. Tsutsumi, T. Yamada, H. Matsui, S. Haas, and T. Hasegawa, “Competition between charge-transfer exciton dissociation and direct photocarrier generation in molecular donor-acceptor compounds”, Phys. Rev. Lett. 105, 226601:14 (2010).

81. M. Kraus, S. Richler, A. Opitz, W. Brutting, S. Haas, T. Hasegawa, A. Hinderhofer, F. Schreiber, “High-mobility copper-phthalocyanine field-effect transistors with tetratetracontane passivation layer and organic metal contacts”, J. Appl. Phys. 107, 094503:16 (2010).

82. H. Matsui, A. S. Mishchenko, and T. Hasegawa, "Distribution of Localized States from Fine Analysis of Electron Spin Resonance Spectra in Organic Transistors", Phys. Rev. Lett. 104, 056602 (2010).

83. T.Hasegawa and J.Takeya, "Organic field-effect transistors using single crystals", Sci. Technol. Adv. Mater. 10, 024314 (2009).

84. T.Yamada, T.Hasegawa, M. Hiraoka, H. Matsui, Y.Tokura, and G.Saito, "Control of film morphology and its effects on subthreshold characteristics in dibenzotetrathiafulvalene organic thin-film transistors", Appl. Phys. Lett. 92, 233306 (2008).

85. H. Matsui, T. Hasegawa, Y. Tokura, M. Hiraoka, and T. Yamada, "Polaron motional narrowing of electron spin resonance in organic transistors", Phys. Rev. Lett. 100, 126601 (2008).

86. H. Okamoto, H. Matsuzaki, T. Wakabayashi, Y. Takahashi, and T. Hasegawa, "Photoinduced metallic state originating from spin-charge separation in a one-dimensional organic Mott insulator", Phys. Rev. Lett. 98, 037401 (2007).

87. K. Yonemitsu, N. Maeshima, and T. Hasegawa,"Suppression of rectification at metal-Mott insulator interfaces", Phys. Rev. B 76, 235118 (2007).

88. M. Hiraoka, T. Hasegawa, T. Yamada, Y. Takahashi, S. Horiuchi, and Y. Tokura, "On-substrate synthesis of molecular conductor films and circuits", Adv. Mater. 19, 3248 (2007).

89. Y. Takahashi, T. Hasegawa, S. Horiuchi, R. Kumai, Y. Tokura, and G. Saito, "High mobility organic field-effect transistor based on hexamethylenetetrathiafulvalene with organic metal electrodes", Chem. Mater. 19, 6382 (2007).

90. S. Horiuchi, T. Hasegawa, and Y. Tokura, "Molecular donor-acceptor compounds as prospective organic electronics materials", J. Phys. Soc. Jpn. 75, 051016 (2006).

91. K. Sakai, T. Hasegawa, M. Ichikawa, and Y. Taniguchi, "Field-effect characteristics of a one-dimensional platinum chain compound, bis(1,2-benzoquinonedioximato)platinum(II)", Chem. Lett. 35, 302 (2006).

92. M. Hiraoka, T. Hasegawa, Y. Abe, T. Yamada, Y.Tokura, H. Yamochi, G. Saito, T. Akutagawa, and T. Nakamura, "Inkjet printing of organic metal electrodes using charge-transfer compounds", Appl. Phys. Lett. 89, 173504 (2006).

93. Y. Takahashi, T. Hasegawa, Y. Abe, Y. Tokura, and G. Saito, "Organic metal electrodes for controlled p- and n-type carrier injections in organic field-effect transistors", Appl. Phys. Lett. 88, 073504 (2006).

94. Y. Abe, T. Hasegawa, Y. Takahashi, T. Yamada, and Y. Tokura, "Control of threshold voltage in pentacene thin-film transistors using carrier doping at the charge-transfer interface with organic acceptors", Appl. Phys. Lett. 87, 153506 (2005).

95. Y. Takahashi, T. Hasegawa, Y. Abe, Y. Tokura, K. Nishimura, and G. Saito, "Tuning of electron injections for n-type organic transistor based on charge-transfer compounds", Appl. Phys. Lett. 86, 063504 (2005).

96. T. Hasegawa, R. Kumai, Y. Takahashi, Y. Tokura, and H. Sawa, "Clamp-type pressure cell for full structure determination of molecular single crystals up to 1.5 GPa", Rev. Sci. Instrum. 76, 073903 (2005).

97. H. Sakamoto, K. Mizoguchi, and T. Hasegawa, "Magnetic properties of (BEDT-TTF)(ClMeTCNQ) studied by ESR under pressure: a neutral-ionic crossover and thermoinduced mesophase", Phys. Rev. Lett. 93, 186401 (2004).

98. T. Hasegawa, K. Mattenberger, J. Takeya, and B. Batlogg, "Ambipolar field-effect carrier injections in organic Mott insulators", Phys. Rev. B 69, 245115 (2004).

99. T. Sato, T. Hasegawa, T. Akutagawa, T. Nakamura, and R. Kondo, "2kF transitions in a series of (DMET)2(X1X2TCNQ) [X1, X2 = Br, Cl, F, CH3, H]; subsidiary lattice effect by the anion radicals", Phys. Rev. B 69, 075103 (2004).

100. T. Hasegawa, T. Akutagawa, T. Nakamura, "Novel magneto-lattice transition in the mixed-stack charge-transfer complexes with intercolumnar networks", Synth. Met. 133-134, 623 (2003).

101. R.Kondo, T.Hasegawa, S.Kagoshima, T.Mochida, Y.Iwasa, K.Hiraki, and T.Takahashi, "Superconductivity and metal-insulator transition in twin-columnar organic superconductor, (BETS)2(X2TCNQ) [X=Cl, Br]", J. Phys. Soc. Jpn. 70, 3023 (2001).

102. T.Hasegawa, T.Akutagawa, T.Nakamura, T.Mochida, R.Kondo, S.Kagoshima, and Y.Iwasa, "Neutral-ionic phase transition of (BEDT-TTF)(ClMeTCNQ) under pressure", Phys. Rev. B 64, 85106 (2001).

103. T.Hasegawa, T.Mochida, R.Kondo, S.Kagoshima, Y.Iwasa, T.Akutagawa, T.Nakamura, and G.Saito, "Mixed-stack charge-transfer complexes with intercolumnar networks", Phys. Rev. B 62, 10059 (2000).

104. R.Kondo, T.Hasegawa, T.Mochida, S.Kagoshima, and Y.Iwasa, "Donor-acceptor type superconductor, (BETS)2(Cl2TCNQ)", Chem. Lett. 1999, 333 (1999).

105. T.Hasegawa, K.Inukai, S.Kagoshima, T.Sugawara, T.Mochida, S.Sugiura, and Y.Iwasa, "(BEDT-TTF)(F1TCNQ) and (BEDT-TTF)(F2TCNQ)x(TCNQ)1-x (x ca.0.5): all-organic metals down to 2K", Chem. Commun. 1997, 1377 (1997).

106. T.Hasegawa, S.Kagoshima, T.Mochida, S.Sugiura, and Y.Iwasa, "Electronic states and anti-ferromagnetic order in mixed-stack charge-transfer compound (BEDT-TTF)(F2TCNQ)", Solid State Commun. 103, 489 (1997).

107. T.Hasegawa, Y.Iwasa, T.Koda, H.Kishida, Y.Tokura, S.Wada, H.Tashiro, H.Tachibana, and M.Matsumoto, "Nature of one-dimensional excitons in polysilanes", Phys. Rev. B 54, 11365 (1996).

108. T.Hasegawa, Y.Iwasa, T.Koda, H.Kishida, Y.Tokura, S.Wada, H.Tashiro, H.Tachibana, and M.Matsumoto, "Nature of one-dimensional excitons in polysilanes", Phys. Rev. B 54, 11365 (1996).

109. H.Kishida, T.Hasegawa, Y.Iwasa, T.Koda, Y.Tokura, H,Tachibana, M.Matsumoto, S.Wada, T.T.Lay, and H.Tashiro, "Electric-field-induced second-harmonic generation mediated by one-dimensional excitons in polysilanes", Phys. Rev. B 50, 7786 (1995).

110. T.Hasegawa, Y.Iwasa, T.Koda, H.Kishida, Y.Tokura, S.Wada, H.Tashiro, H.Tachibana, M.Matsumoto, and R.D.Miller, "Nonlinear optical study of polysilanes", in Light Emission from Novel Silicon Materials, J. Phys. Soc. Jpn. 63, 64 (1994).

111. T.Hasegawa, Y.Iwasa, H.Sunamura, T.Koda, Y.Tokura, H.Tachibana, M.Matsumoto, and S.Abe, "Nonlinear optical spectroscopy on one-dimensional excitons in silicon polymer, polysilane", Phys. Rev. Lett. 69, 668 (1992).

112. T.Hasegawa, Y.Iwasa, H.Kishida, T.Koda, Y.Tokura, H.Tachibana, and Y.Kawabata, "Two-photon resonant third-harmonic generation in polysilanes", Phys. Rev. B 45, 6317 (1992).

113. T.Hasegawa, K.Ishikawa, T.Kanetake, T.Koda, K.Takeda, H.Kobayashi, and K.Kubodera, "Excitonic resonant effect in the third-order nonlinear optical properties of blue and red-formpolydiacetylene films", Chem. Phys. Lett. 171, 239 (1990).