50. "Reactive sputtering of SnS thin films using sulfur plasma and a metallic tin target: achieving stoichiometry and large grains"
D. Motai, I. Suzuki*, T. Nogami, T. Omata
Submitted (2025) [arXiv preprint]
49. "Role of hydrogen in the n-type oxide semiconductor MgIn2O4: Experimental observation of electrical conductivity and first-principles insight"
S. Kudo, T. Yamasaki, I. Suzuki, A. Dorai, R. Costa-Amaral, S. Bae, Y. Kumagai*, H. Tanimura, T. Ichitsubo, T. Omata*
48. "Non-stoichiometry in SnS: How it affects thin-film morphology and electrical properties"
T. Nogami, I. Suzuki*, D. Motai, H. Tanimura, T. Ichitsubo, T. Omata
47. "Unconventional and Powerful Ion Sources for Solid-State Ion Exchange, Cu2SO4 and Cu3PO4: Exemplified by Synthesis of Meta-stable β-CuGaO2 from Stable β-LiGaO2"
I. Suzuki*, K. Washizu, D. Motai, M. Kita, T. Omata
Inorg. Chem., 64, 2165-2169 (2025)
46. "Enhancing Proton Mobility in Silicophosphoric Acid by Replacing Si with Al"
T. Ishiyama*, Y. Yamada, H. Nagashima, I. Suzuki, M. Fujioka, M. Ono, T. Omata*, J. Nishii
Inorg. Chem., 64, 105-112 (2025)
45. "Effects of Process Gas Pressure on Properties of WO3 Thin Films Deposited by RF Sputtering"
R. Matsuo, T. Yamasaki, I. Suzuki, S. Kawanishi, T. Omata*
J. Phys. Chem. C, 129, 1516-1524 (2025)
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)