2022 Fiscal Year Final Research Report

Realization of transparent coated solar cells by valence band control of copper halide compounds

Research Project

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Project/Area Number	20K04567
Research Category	Grant-in-Aid for Scientific Research (C)
Allocation Type	Multi-year Fund
Section	一般
Review Section	Basic Section 21050:Electric and electronic materials-related
Research Institution	Tsuruoka National College of Technology
Principal Investigator	Moriya Katsuhiko 鶴岡工業高等専門学校, その他部局等, 准教授 (90509671)
Co-Investigator(Kenkyū-buntansha)	田中久仁彦長岡技術科学大学, 工学研究科, 教授 (30334692)
Project Period (FY)	2020-04-01 – 2023-03-31
Keywords	透明塗布型太陽電池 / 透明p型半導体 / 銅ハライド化合物 / 非真空プロセス / 価電子帯制御 / 低コスト / 環境調和型半導体 / 生活環境改善
Outline of Final Research Achievements	Environmentally friendly CuI_(1-X)I_X (CuICl) thin films were fabricated as transparent p-type semiconductor materials by a non-vacuum process. And the composition dependence of the physical properties was clarified. In addition to establishing the potential as a transparent p-type semiconductor, we also proceeded with research with the goal of realizing a transparent coating-type solar cell that takes advantage of these physical properties. As a result, it was found that the bandgap gradually decreased when the mixture ratio X was between 1.0 and 0.8, and increased when X was between 0.6 and 0.0. In the ionization potential measurement, the measured value increased as X increased. From the above results, it was confirmed that the valence band can be controlled by changing the mixing ratio.
Free Research Field	電気電子材料
Academic Significance and Societal Importance of the Research Achievements	本研究の学術的意義，社会的意義は，資源戦略的に優れた環境調和型半導体材料である銅ハライド化合物を用い，低コストで透明薄膜太陽電池を実現することにある．透明p型半導体である銅ハライド化合物は組成比を変化することで，価電子帯の制御が可能であることが確認された．また，低コストで作製可能である溶液作製法により，銅ハライド化合物の形成が可能であることも確認した。これらの結果は，銅ハライド化合物を用いた透明塗布型薄膜太陽電池の作製に役立つことが期待される。