Mitsutaro Umehara
Mitsutaro Umehara
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Cu2Sn1-xGexS3 (x= 0.17) thin-film solar cells with high conversion efficiency of 6.0%
M Umehara, Y Takeda, T Motohiro, T Sakai, H Awano, R Maekawa
Applied Physics Express 6 (4), 045501, 2013
Cu2ZnSnS4 photovoltaic cell with improved efficiency fabricated by high‐temperature annealing after CdS buffer‐layer deposition
S Tajima, M Umehara, M Hasegawa, T Mise, T Itoh
Progress in Photovoltaics: Research and Applications 25 (1), 14-22, 2017
Cu2Sn1− xGexS3 solar cells fabricated with a graded bandgap structure
M Umehara, S Tajima, Y Aoki, Y Takeda, T Motohiro
Applied Physics Express 9 (7), 072301, 2016
Analyzing machine learning models to accelerate generation of fundamental materials insights
M Umehara, HS Stein, D Guevarra, PF Newhouse, DA Boyd, JM Gregoire
npj Computational Materials 5 (1), 34, 2019
Energy level diagram around Ge-rich grain boundaries in Cu2Sn1-xGexS3 (CTGS) thin-film solar cells
M Umehara, Y Takeda, K Oh-Ishi, Y Aoki, T Motohiro, T Sakai, ...
Solar Energy Materials and Solar Cells 134, 1-4, 2015
Multi-component background learning automates signal detection for spectroscopic data
SE Ament, HS Stein, D Guevarra, L Zhou, JA Haber, DA Boyd, ...
npj Computational Materials 5 (1), 77, 2019
Combinatorial alloying improves bismuth vanadate photoanodes via reduced monoclinic distortion
PF Newhouse, D Guevarra, M Umehara, SE Reyes-Lillo, L Zhou, ...
Energy & Environmental Science 11 (9), 2444-2457, 2018
Photovoltaic properties of Cu2ZnSnS4 cells fabricated using ZnSnO and ZnSnO/CdS buffer layers
S Tajima, M Umehara, T Mise
Japanese journal of applied physics 55 (11), 112302, 2016
Laser annealing to form high-temperature phase of FeS2
M Umehara, Y Takeda, H Azuma, T Motohiro
Japanese Journal of Applied Physics 51 (2S), 02BP10, 2012
Wide bandgap Cu2ZnSn1− xGexS4 fabricated on transparent conductive oxide-coated substrates for top-cells of multi-junction solar cells
M Umehara, S Tajima, Y Takeda, T Motohiro
Journal of Alloys and Compounds 689, 713-717, 2016
Multi-modal optimization of bismuth vanadate photoanodes via combinatorial alloying and hydrogen processing
PF Newhouse, D Guevarra, M Umehara, DA Boyd, L Zhou, JK Cooper, ...
Chemical communications 55 (4), 489-492, 2019
Improvement of red light response of Cu2Sn1− xGexS3 solar cells by optimization of CdS buffer layers
M Umehara, Y Takeda, S Tajima, T Motohiro, T Sakai, R Maekawa
Journal of Applied Physics 118 (15), 2015
Enhanced bulk transport in copper vanadate photoanodes identified by combinatorial alloying
PF Newhouse, D Guevarra, L Zhou, Y Wang, M Umehara, DA Boyd, ...
Matter 3 (5), 1601-1613, 2020
Bi alloying into rare earth double perovskites enhances synthesizability and visible light absorption
PF Newhouse, L Zhou, M Umehara, DA Boyd, E Soedarmadji, JA Haber, ...
ACS Combinatorial Science 22 (12), 895-901, 2020
Alkaline-stable nickel manganese oxides with ideal band gap for solar fuel photoanodes
SK Suram, L Zhou, A Shinde, Q Yan, J Yu, M Umehara, HS Stein, ...
Chemical communications 54 (36), 4625-4628, 2018
Band slope in CdS layer of ZnO: Ga/CdS/Cu2ZnSnS4 photovoltaic cells revealed by hard X-ray photoelectron spectroscopy
K Kataoka, S Tajima, M Umehara, N Takahashi, N Isomura, K Kitazumi, ...
Applied Physics Letters 109 (20), 2016
Spike current induction by photogenerated charge accumulation at the surface sites of porous porphyrinic zirconium metal-organic framework electrodes in photoelectrochemical cells
S Moribe, Y Takeda, M Umehara, H Kikuta, J Ito, J Ma, Y Yamada, ...
Bulletin of the Chemical Society of Japan 96 (4), 321-327, 2023
Sintering Metal–Organic Framework Gels for Application as Structural Adhesives
I Miyazaki, Y Masuoka, A Ohshima, N Takahashi, A Suzumura, S Moribe, ...
Small 19 (25), 2300298, 2023
Hepatobiliary and Pancreatic: Hemosuccus pancreaticus due to an intraductal papillary mucinous neoplasm: A rare cause of obscure gastrointestinal bleeding
R Sugiura, K Kinoshita, H Naruse, Y Yamamoto, K Hatanaka, J Ito, ...
Journal of gastroenterology and hepatology 35 (3), 363, 2020
Combinatorial Synthesis of Oxysulfides in the Lanthanum–Bismuth-Copper System
M Umehara, L Zhou, JA Haber, D Guevarra, K Kan, PF Newhouse, ...
ACS Combinatorial Science 22 (6), 319-326, 2020
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