Faculty Profiles - OKU Takeo

Papers - OKU Takeo

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Stability characterization of PbI2‑added CH3NH3PbI3−xClx photovoltaic devices Reviewed International journal

N. Ueoka and T. Oku

ACS Applied Materials & Interfaces 10 44443 - 44451 2018.12

Fabrication and characterization of CH3NH3PbI3 perovskite solar cells added with polysilanes Reviewed International journal

T. Oku, J. Nomura, A. Suzuki, H. Tanaka, S. Fukunishi, S. Minami, and S. Tsukada

International Journal of Photoenergy 2018 8654963-1 - 8654963-7 2018.10

Fabrication and Characterization of the copper bromides-added CH3NH3PbI3-xClx perovskite solar cells Reviewed International journal

Tanaka H., Ohishi Y., Oku T.

Synthetic Metals 244 128 - 133 2018.10

Language：English Publishing type：Research paper (scientific journal) Publisher：Synthetic Metals Participation form：Joint(The vice charge)

© 2018 Elsevier B.V. CH3NH3PbI3-xClx-based perovskite photovoltaic devices were fabricated and characterized. The effects of CuBr or CuBr2addition on the photovoltaic properties and microstructures of the perovskite phase were investigated. The conversion efficiencies of the perovskite solar cells added with copper bromides were improved compared with the standard CH3NH3PbI3-xClxdevices. The efficiency of the device with CuBr2added was higher than that with CuBr added.

DOI： 10.1016/j.synthmet.2018.07.008

Scopus

Other Link： https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85050679924&origin=inward

Time-dependent non-linear size change of C<inf>60</inf>-ethylenediamine adduct particles in formation process Reviewed

Akiyama T., Ono Y., Miyamura H., Saito J., Kimura K., Higashida S., Oku T.

Journal of Nanoparticle Research 20 ( 9 ) 2018.9

Language：English Publishing type：Research paper (scientific journal) Publisher：Journal of Nanoparticle Research

© 2018, Springer Nature B.V. Addition reaction between C60 and ethylenediamine occurred at room temperature in an ambient condition. C60-ethylenediamine adduct particles were prepared by mixing toluene solutions of C60 and ethyelenediamine. Average diameter of the C60-ethylenediamine adduct particles was changed non-linearly according to the reaction time, which were observed using transmission electron microscopy. Early stage of the reaction, the diameter of the adduct particles was changed from about 250 to about 430 nm. Then, the size of the adduct particles was converged to about 300 nm. During this addition reaction, the crystalline sizes of adduct particles were constant about 2–3 nm, regardless of the sizes of the adduct particles, which were determined by X-ray diffraction measurement. [Figure not available: see fulltext.].

DOI： 10.1007/s11051-018-4353-9

Scopus

Other Link： https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85053299309&origin=inward

Effects of transition metals incorporated into perovskite crystals on the electronic structures and magnetic properties by first-principles calculation Reviewed

Suzuki A., Oku T.

Heliyon 4 ( 8 ) 2018.8

Language：English Publishing type：Research paper (scientific journal) Publisher：Heliyon

© 2018 The Authors Additive effects of transition metals (M = Cr2+, Co2+, Cu2+and Y3+) on the electronic structures and magnetic properties of formamidinium lead halide perovskite compounds (FAPbI3, where FA = NH2CHNH2+) were investigated by first-principle calculation using density functional theory. In the case of Cr2+, Cu2+and Y3+-incorporated FAPbI3perovskite crystals, the electron density distribution of d-p hybrid orbital on the transition metal and iodine halogen-atoms were delocalized at frontier orbital. The total and partial density of state appeared the 3d-p hybrid orbital near the frontier orbital with narrowing band gap, yielding the wide broad absorption in the near-infrared region. The electronic correlation worked in between the localized spin on 3d orbital of the metal, and the itinerant carriers on the 5p orbital of the iodine halogen ligand and the 6p orbital of the lead atom in the perovskite crystal. The vibration behavior of the Raman and Infrared spectra were associated with change of polarization and slight distortion near the coordination structure. The considerable splitting of chemical shift of127I-NMR and207Pb-NMR in the Co2+and Cu2+-incorporated FAPbI3crystals were caused by crystal field splitting as Jahn-Teller effect with nearest-neighbor nuclear quadrupole interaction based on the charge distribution.

DOI： 10.1016/j.heliyon.2018.e00755

Scopus

Other Link： https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85052123274&origin=inward

Effects of transition metals incorporated into perovskite crystals on the electronic structures and magnetic properties by first-principles calculation Reviewed International journal

A. Suzuki and T. Oku

Heliyon 4 e00755-1 - e00755-22 2018.8

Possible applications of nanomaterials for nuclear fusion devices Invited Reviewed International journal

T. Oku

Energy Harvesting and Systems 5 11 - 27 2018.7

Structural stabilities of organic–inorganic perovskite crystals Reviewed

H. Tanaka, T. Oku, and N. Ueoka

Japanese Journal of Applied Physics 57 08RE12-1 - 08RE12-9 2018.7

Effects of Cu addition to perovskite CH3NH3PbI3-xClx photovoltaic devices with hot airflow during spin-coating Reviewed

H. Tanaka, Y. Ohishi, and T. Oku

Japanese Journal of Applied Physics 57 08RE10-1 - 08RE10-5 2018.7

Effects of PbI2 addition and TiO2 electron transport layers for perovskite solar cells Reviewed

N. Ueoka, T. Oku, H. Tanaka, A. Suzuki, H. Sakamoto, M. Yamada, S. Minami, S. Miyauchi, and S. Tsukada

Japanese Journal of Applied Physics 57 08RE05-1 - 08RE05-7 2018.7

Microstructures, optical and photovoltaic properties of CH3NH3PbI3(1−x)Clx perovskite films with CuSCN additive Reviewed International journal

Y. Shirahata and T. Oku

Materials Research Express 5 055504-1 - 055504-10 2018.5

Effects of excess PbI2 addition to CH3NH3PbI3-xClx perovskite solar cells Reviewed

N. Ueoka, T. Oku, Y. Ohishi, H. Tanaka, and A. Suzuki

Chemistry Letters 47 (2018) 528–531 47 528 - 531 2018.4

Highly (100)-oriented CH3NH3PbI3(Cl) perovskite solar cells prepared with NH4Cl using an air blow method Reviewed International journal

T. Oku, Y. Ohishi and N. Ueoka

RSC Advances 8 10389 - 10395 2018.3

Fabrication and characterization of perovskite CH3NH3Pb1-xSbxI3-3xBr3 photovoltaic devices Reviewed International journal

J. Yamanouchi, T. Oku, Y. Ohishi, M. Fukaya, N. Ueoka, H. Tanaka, and A. Suzuki

Advances in Materials Research 7 435 - 446 2018.3

Rietveld refinement of crystal structure of perovskite CH3NH3Pb(Sb)I3 solar cells Reviewed

Y. Ando, T. Oku, and Y. Ohishi

Japanese Journal of Applied Physics 57 02CE02-1 - 02CE02-5 2018.2

First-principles calculation study of electronic structures and magnetic properties of Mn-doped perovskite crystals for solar cell applications Reviewed

A. Suzuki and T. Oku

Japanese Journal of Applied Physics 57 02CE04-1 - 02CE04-7 2018.2

Fabrication and characterization of CH3NH3(Cs)Pb(Sn)I3(Cl) perovskite solar cells with TiO2 nanoparticle layers Reviewed

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

Japanese Journal of Applied Physics 57 02CE03-1 - 02CE03-7 2018.2

A state-of-the-art compact SiC photovoltaic inverter with maximum power point tracking function Reviewed International journal

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

AIP Conference Proceedings 1929 020002-1 - 020002-9 2018.1

Effects of CsBr addition on the performance of CH3NH3PbI3-xClx-based solar cells Reviewed International journal

N. Ueoka, T. Oku, Y. Ohishi, H. Tanaka, A. Suzuki, H. Sakamoto, M. Yamada, S. Minami, and S. Tsukada

AIP Conference Proceedings 1929 020026-1 - 020026-8 2018.1

Insertion effect of spin-coated films of C60-ethylenediamine adduct on organic thin-film solar cells

A. Yamada, D. Izumoto, T. Akiyama, K. Fujita, A. Suzuki, and T. Oku

AIP Conference Proceedings 1929 020020-1 - 020020-5 2018.1

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Papers - OKU Takeo