Faculty Profiles - OKU Takeo

Papers - OKU Takeo

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Effects of co-addition of sodium chloride and copper(II) bromide to mixed-cation mixed-halide perovskite photovoltaic devices Reviewed International journal

N. Ueoka and T. Oku

Effects of co-addition of sodium chloride and copper(II) bromide to mixed-cation mixed-halide perovskite photovoltaic devices 3 7272 - 7283 2020.7

Fabrication and surface-enhanced Raman scattering properties of twodimensional gold and silver nanoparticle mixed assemblies by liquid–liquid interfacial precipitation method Reviewed

N. Koyama, S. Banya, T. Akiyama, K. Sugawa, and T. Oku

Applied Physics Express 13 055001-1 - 055001-4 2020.4

Photovoltaic characteristics of CH3NH3PbI3 perovskite solar cells added with ethylammonium bromide and formamidinium iodide Reviewed International journal

K. Nishi, T. Oku, T. Kishimoto, N. Ueoka and A. Suzuki

Coatings 10 410-1 - 410-10 2020.4

Electronic structures, spectroscopic properties, and thermodynamic characterization of sodium or potassium-incorporated CH3NH3PbI3 by first principles calculation Reviewed International journal

A. Suzuki, Y. Miyamoto, and T. Oku

Journal of Materials Science 55 9728 - 9738 2020.3

Fabrication and photocatalytic behavior of titanium oxide–gold nanoparticles composite ultrathin films prepared using surface sol–gel process Reviewed International journal

S. Mitsukawa, T. Akiyama, M, Hinoue, K. Shima, T. Takishita, S. Higashida, N. Koyama, K. Sugawa, M. Ogawa, H. Sakaguchi and T. Oku

Journal of Sol-Gel Science and Technology 93 563 - 569 2020.1

Dependence of electric power flow on solar radiation power in compact photovoltaic system containing SiC-based inverter with spherical Si solar cells Reviewed International journal

Y. Ando, T. Oku, M. Yasuda, K. Ushijima, H. Matsuo, M. Murozono

Heliyon 6 e03094-1 - e03094-10 2020.1

Effects of annealing temperature on decaphenylcyclopentasilane-inserted CH3NH3PbI3 perovskite solar cells Reviewed International journal

M. Taguchi, A. Suzuki, T. Oku, N. Ueoka, S. Minami, and M. Okita

Chemical Physics Letters 737 136822-1 - 136822-7 2019.10

Additive effects of alkali metals on Cu-modified CH3NH3PbI3-δClδ photovoltaic devices Reviewed International journal

N. Ueoka, T. Oku and A. Suzuki

RSC Advances 9 24231 - 24240 2019.8

First-principles calculation study of electronic structures of alkali metals (Li, K, Na and Rb)-incorporated formamidinium lead halide perovskite compounds Reviewed

Suzuki A., Oku T.

Applied Surface Science 483 912 - 921 2019.7

Language：English Publishing type：Research paper (scientific journal) Publisher：Applied Surface Science

© 2019 Electronic structures of alkali metals (Li, Na, K or Rb)-incorporated formamidinium lead halide perovskite compounds were investigated by first-principles calculation. The conduction band were supplied with electrons from energy levels at 2s, 3s, 4s and 5s orbital of alkali metal to energy levels at 6p orbital of Pb atom in the perovskite crystal. Deviation of charge distribution in the perovskite crystal promoted the photo-induced charge generation, electron correlation and electron-lattice interaction as phonon effectiveness. The chemical shifts of 127 I-NMR in the perovskite crystal were originated in a slight perturbation of the coordination structure with nuclear quadruple interaction based on the electric field gradient. The slight incorporation of alkali metal near the ligand structure decreased the enthalpy with the Gibbs free-energy by contribution of the entropy due to the P–I stretching vibration.

DOI： 10.1016/j.apsusc.2019.04.049

Scopus

Other Link： https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85064090102&origin=inward

Effects of guanidinium addition to CH3NH3PbI3-xClx perovskite photovoltaic devices Reviewed

T. Kishimoto, A. Suzuki, N. Ueoka and T. Oku

Journal of the Ceramic Society of Japan 127 491 - 497 2019.7

Fabrication and evaluation of K-doped MA0.8FA0.1K0.1PbI3(Cl) perovskite solar cells Reviewed International journal

H. Machiba, T. Oku, T. Kishimoto, N. Ueoka, and A. Suzuki

Chemical Physics Letters 730 117 - 123 2019.5

Fabrication and characterization of perovskite type solar cells using phthalocyanine complexes Reviewed International journal

A. Suzuki, H. Okumura, Y. Yamasaki, and T. Oku

Applied Surface Science 488 586 - 592 2019.5

Electronic structures and magnetic properties of transition metal doped CsPbI3 perovskite compounds by first principle calculation Reviewed International journal

A. Suzuki and T. Oku

Physics of the Solid State 61 1074 - 1085 2019.4

Additive effect of formamidinium chloride in methylammonium lead halide compound-based perovskite solar cells Reviewed International journal

A. Suzuki, M. Kato, N. Ueoka, and T. Oku

Journal of Electronic Materials 2019.3

Effects of TiO2 nanoparticles with different sizes on the performance of CH3NH3PbI3-xClx solar cells Reviewed International journal

N. Ueoka, T. Oku, A. Suzuki, H. Sakamoto, M. Yamada, S. Minami, and M. Okita

AIP Conference Proceedings 2067 020001-1 - 020001-10 2019.1

Effects of poly(methyl methacrylate) addition to perovskite photovoltaic devices Reviewed International journal

M. Taguchi, A. Suzuki, N. Ueoka, and T. Oku

AIP Conference Proceedings 2067 020018-1 - 020018-8 2019.1

Fabrication and photovoltaic properties of an invert-type organic thin-film solar cells incorporation of phosphorescent material into electron transport layer Reviewed International journal

Y. Matsumiya, T. Akiyama, I. Yamada, and T. Oku

AIP Conference Proceedings 2067 020013-1 - 020013-6 2019.1

Fabrication and characterization of perovskite solar cells added with zinc phthalocyanine to active layer Reviewed International journal

A. Suzuki, Y. Hayashi, Y. Yamasaki, and T. Oku

AIP Conference Proceedings 2067 020010-1 - 020010-6 2019.1

Effects of KBr or KCl addition to CH3NH3PbI3(Cl) photovoltaic devices International journal

H. Machiba, T. Oku, and A. Suzuki

AIP Conference Proceedings 2067 020009-1 - 020009-7 2019.1

Effects of decaphenylcyclopentasilane addition on photovoltaic properties of perovskite solar cells Reviewed International journal

M. Taguchi, A. Suzuki, T. Oku, S. Fukunishi, S. Minami, and M. Okita

Coatings 8 461-1 - 461-10 2018.12

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