Search Results - "Tampo, Hitoshi"

Cu2O single crystal growth using CuCl flux and bandgap evaluation by Kawamura, Fumio, Nagai, Takehiko, Tampo, Hitoshi

“…•Novel methodology for single crystal growth.•Precise Cu2O bandgap: Eg = 1.95 eV.•Potential for enhanced solar cell efficiency.•Bridging the gap in Cu2O…”
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Improving the Open Circuit Voltage through Surface Oxygen Plasma Treatment and 11.7% Efficient Cu2ZnSnSe4 Solar Cell by Tampo, Hitoshi, Kim, Shinho, Nagai, Takehiko, Shibata, Hajime, Niki, Shigeru

“…The photovoltaic performance of Cu2ZnSnSe4 (CZTSe) solar cells subjected to surface oxygen plasma treatments is investigated. The observed improvements are…”
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Very small tail state formation in Cu2ZnGeSe4 by Nagaya, Keisuke, Fujimoto, Shohei, Tampo, Hitoshi, Kim, Shinho, Nishiwaki, Mitsutoshi, Nishigaki, Yukinori, Kato, Masato, Shibata, Hajime, Fujiwara, Hiroyuki

“…We find that coevaporated Cu2ZnGeSe4 has an ideal bandgap for solar cells (1.39 ± 0.01 eV) and shows quite reduced tail state absorption with a very low Urbach…”
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Pressure-Induced Transition from Wurtzite and Epitaxial Stabilization for Thin Films of Rocksalt MgSnN2 by Makiuchi, Kaede, Kawamura, Fumio, Jia, Junjun, Song, Yelim, Yata, Shunichiro, Tampo, Hitoshi, Murata, Hidenobu, Yamada, Naoomi

“…The thin-film synthesis of high-pressure phases in inorganic compounds remains a challenge. The synthesis of high-pressure phases in thin-film form opens…”
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Analysis for efficiency potential of II–VI compound, chalcopyrite, and kesterite-based tandem solar cells by Yamaguchi, Masafumi, Tampo, Hitoshi, Shibata, Hajime, Schygulla, Patrick, Dimroth, Frank, Kojima, Nobuaki, Ohshita, Yoshio

“…The development of high-performance solar cells offers a promising pathway toward achieving high power per unit cost for many applications. As single-junction…”
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Highly Controlled Codeposition Rate of Organolead Halide Perovskite by Laser Evaporation Method by Miyadera, Tetsuhiko, Sugita, Takeshi, Tampo, Hitoshi, Matsubara, Koji, Chikamatsu, Masayuki

“…Organolead-halide perovskites can be promising materials for next-generation solar cells because of its high power conversion efficiency. The method of precise…”
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Tunability of the bandgap of SnS by variation of the cell volume by alloying with A.E. elements by Kawamura, Fumio, Song, Yelim, Murata, Hidenobu, Tampo, Hitoshi, Nagai, Takehiko, Koida, Takashi, Imura, Masataka, Yamada, Naoomi

“…We clarified that the bandgap of inorganic materials is strongly correlated with their effective coordination number (ECoN) via first-principles calculations…”
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Examination of Suitable Bandgap Grading of Cu(InGa)Se2 Bottom Absorber Layers for Tandem Cell Application by Jeong, Changwook, Nagai, Takehiko, Ishizuka, Shogo, Tampo, Hitoshi, Hajime, Shibata, Kim, Shinho, Kim, Yangdo

“…A high‐efficiency tandem solar cell comprises of top and bottom solar cells. The bottom cell has a bandgap of ≈1.1 eV and is designed to absorb longer…”
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Sodium incorporation effect on morphological and photovoltaic properties for Cu2ZnSnSe4 solar cells by Tampo, Hitoshi, Kim, Shinho, Nagai, Takehiko, Shibata, Hajime

“…The effects of sodium incorporation in Cu2ZnSnSe4 (CZTSe) on morphological and photovoltaic properties were investigated as a function of the sodium supply…”
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Effect of Combined Alkali (KF + CsF) Post‐Deposition Treatment on Cu(InGa)Se2 Solar Cells by Kim, Shinho, Tampo, Hitoshi, Shibata, Hajime, Matsubara, Koji, Niki, Shigeru

“…This study reveals combined alkali (KF + CsF) post‐deposition treatment (PDT) effects on a Cu(InGa)Se2 (CIGSe) cell. Three different alkali‐PDTs (KF, CsF, and…”
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Growth and characterization of coevaporated Cu2SnSe3 thin films for photovoltaic applications by Kim, Kang Min, Tampo, Hitoshi, Shibata, Hajime, Niki, Shigeru

“…Cu2SnSe3 (CTSe) thin films were deposited at various growth temperatures (325–425°C) by coevaporation on soda-lime glass substrates without postannealing…”
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Determination of deep-level defects in Cu2ZnSn(S,Se)4 thin-films using photocapacitance method by Islam, Muhammad Monirul, Halim, Mohammad Abdul, Sakurai, Takeaki, Sakai, Noriyuki, Kato, Takuya, Sugimoto, Hiroki, Tampo, Hitoshi, Shibata, Hajime, Niki, Shigeru, Akimoto, Katsuhiro

“…Deep-level defects were investigated in Cu2ZnSn(S,Se)4 and Cu2ZnSnS4 thin-films using transient photocapacitance (TPC) spectroscopy. A deep-defect, OH1…”
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Determination and interpretation of the optical constants for solar cell materials by Fujiwara, Hiroyuki, Fujimoto, Shohei, Tamakoshi, Masato, Kato, Masato, Kadowaki, Hideyuki, Miyadera, Tetsuhiko, Tampo, Hitoshi, Chikamatsu, Masayuki, Shibata, Hajime

“…[Display omitted] •Effect of very rough surface on spectroscopic ellipsometry analysis is determined.•A simple procedure for the correction of underestimated…”
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Impacts of KF Post-Deposition Treatment on the Band Alignment of Epitaxial Cu(In,Ga)Se2 Heterojunctions by Nagai, Takehiko, Nishinaga, Jiro, Tampo, Hitoshi, Kim, Shinho, Hirayama, Kazuhiro, Matsunobe, Tatsuo, Chen, Guanzhong, Ide, Yuya, Ishizuka, Shogo, Shibata, Hajime, Niki, Shigeru, Terada, Norio

“…In this study, we investigated band alignments at CdS/epitaxial CuIn x Ga1–x Se2 (epi-CIGSe) and epi-CIGSe/GaAs heterointerfaces for solar cell applications…”
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Narrow-bandgap Cu2Sn1−xGexSe3 thin film solar cells by Kim, Kang Min, Kim, Shinho, Tampo, Hitoshi, Shibata, Hajime, Matsubara, Koji, Niki, Shigeru

“…Cu2Sn1−xGexSe3 (CTGSe) thin film solar cells were fabricated by coevaporation with post-annealing treatment. The CTGSe solar cells showed a remarkably improved…”
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Characterization of Surface and Heterointerface of Cu2ZnSn1–xGexSe4 for Solar Cell Applications by Nagai, Takehiko, Kim, Shinho, Tampo, Hitoshi, Tanigawa, Kohei, Iwamoto, Yuya, Hamada, Hiroya, Ohta, Nobuyoshi, Shibata, Hajime, Niki, Shigeru, Terada, Norio

“…This study analyzes the electronic structure of Cu2ZnSn1–xGexSe4 (CZTGSe) surface and band alignments of CdS and CZTGSe using the Ge/(Sn + Ge) composition…”
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Analysis of future generation solar cells and materials by Yamaguchi, Masafumi, Zhu, Lin, Akiyama, Hidefumi, Kanemitsu, Yoshihiko, Tampo, Hitoshi, Shibata, Hajime, Lee, Kan-Hua, Araki, Kenji, Kojima, Nobuaki

“…The efficiency potentials of future generation solar cells such as wide bandgap chalcopyrite, Cu2ZnSnS4 (CZTS), Cu2ZnSn(S,Se)4 (CZTSSe), multi quantum well…”
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Improving the performance of pure sulfide Cu(InGa)S2 solar cells via injection annealing system by Kwon, Ilyeong, Nagai, Takehiko, Ishizuka, Shogo, Tampo, Hitoshi, Shibata, Hajime, Kim, Shinho, Kim, Yangdo

“…In this study, we present an effective method of improving the performance of pure sulfide Cu(InGa)S2 (CIGS) solar cells via injection annealing system. The…”
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Effect of pre-annealing on Cu2ZnSnSe4 thin-film solar cells prepared from stacked Zn/Cu/Sn metal precursors by Kim, Kang Min, Kim, Shinho, Tampo, Hitoshi, Shibata, Hajime, Matsubara, Koji, Niki, Shigeru

“…The effects of pre-annealing the stacked metallic precursor (Zn/Cu/Sn/Mo/glass) on the structural and morphological properties of the resultant Cu2ZnSnSe4…”
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Temperature induced phase transformation in coevaporated Cu2SnSe3 thin films by Kim, Kang Min, Tampo, Hitoshi, Shibata, Hajime, Niki, Shigeru

“…Cu2SnSe3 (CTSe) thin films were prepared by coevaporation at different substrate temperatures (325-400 degree C). The dependence of the phase transformation of…”
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