Research Center for Photovoltaic Technologies

Tsukuba, Japan

Research Center for Photovoltaic Technologies

Tsukuba, Japan
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Umezawa H.,Research Institute for Ubiquitous Energy Devices | Shikata S.,Research Institute for Ubiquitous Energy Devices | Shibata H.,Research Center for Photovoltaic Technologies | Imanishi T.,Molecular Profiling Research Center for Drug Discovery | And 8 more authors.
AIST Today (International Edition) | Year: 2013

Diamond is receiving much attention due to its outstanding properties as a power semiconductor material. The new buffer layer is a ZnMgO alloy fabricated by the sputtering method. Advantages of the new method are that ZnMgo is Cd-free and hence is effective to reduce the environmental load and the sputtering method is a dry process which is simple compared to wet processes. The conversion efficiency of the CIGS solar cell using the new buffer layer is 17.5%, which is comparable to that of CIGS solar cells using a conventional CdS buffer layer fabricated by wet processes. Interspecies hybridization after the speciation between humans and chimpanzees has been heated controversy in evolutionary biology. The estimated values varied significantly among chromosomes, the X chromosome being the smallest value, but the variation could be explained by the variation of mutation rates among chromosomes, not by the variation of divergence times.


Izaki M.,Toyohashi University of Technology | Sugiyama S.,Toyohashi University of Technology | Okamoto T.,Toyohashi University of Technology | Kusano Y.,Toyohashi University of Technology | And 4 more authors.
Progress in Photovoltaics: Research and Applications | Year: 2016

The effects of the immersion into a NH3 aqueous solution on the structural characteristics of the chemically deposited Zn(S,O,OH) layer and photovoltaic performance of the CIGS/Zn(S,O,OH) solar cells were investigated with structural and electrical characterizations. The as-deposited-Zn(S,O,OH) layer possessed a layered structure of upper Zn(OH)2 and Zn(S,O) layers, and the upper Zn(OH)2 layer was removed by the immersion. The conversion efficiency for the CIGS solar cell was improved from 6.8% to 13.7% by removing the upper Zn(OH)2 layer during the immersion. Copyright © 2015 John Wiley & Sons, Ltd.


Izaki M.,Toyohashi University of Technology | Sugiyama S.,Toyohashi University of Technology | Okamoto T.,Toyohashi University of Technology | Kusano Y.,Toyohashi University of Technology | And 4 more authors.
Progress in Photovoltaics: Research and Applications | Year: 2015

The effects of the immersion into a NH3 aqueous solution on the structural characteristics of the chemically deposited Zn(S,O,OH) layer and photovoltaic performance of the CIGS/Zn(S,O,OH) solar cells were investigated with structural and electrical characterizations. The as-deposited-Zn(S,O,OH) layer possessed a layered structure of upper Zn(OH)2 and Zn(S,O) layers, and the upper Zn(OH)2 layer was removed by the immersion. The conversion efficiency for the CIGS solar cell was improved from 6.8% to 13.7% by removing the upper Zn(OH)2 layer during the immersion. © 2015 John Wiley & Sons, Ltd.

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