CuInSe2 (CIS) Thin Film Solar Cells by Direct Coating and Selenization of Solution Precursors

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• 作者：SeJin Ahn ; ChaeWoong Kim ; Jae Ho Yun ; Jihye Gwak ; Sunho Jeong ; Beyong-Hwan Ryu ; KyungHoon Yoon
• 刊名：Journal of Physical Chemistry C
• 出版年：2010
• 出版时间：May 6, 2010
• 年：2010
• 卷：114
• 期：17
• 页码：8108-8113
• 全文大小：338K
• 年卷期：v.114,no.17(May 6, 2010)
• ISSN：1932-7455

文摘

CuInSe₂ (CIS) absorber layer was formed by a direct nonvacuum coating and a subsequent selenization of precursor solutions of Cu(NO₃)₂ and InCl₃ dissolved in methanol. The viscosity of precursor solutions was adjusted by adding ethyl-cellulose (EC) to be suitable for the doctor-blade coating. During the coating and drying process Cu²⁺ ions in the starting solution were reduced to Cu⁺, resulting in precursor films consisting of CuCl crystals and amorphous In compound embedded in EC matrix. Selenization of the precursor films with Se vapor at elevated temperature generated double-layered films with an upper layer of chalcopyrite CIS and a carbon residue bottom layer. Significant In loss was observed during the selenization, which was attributed to the evaporation of the In₂Se binary phase, confirmed by investigating the change in the Cu/In ratio of the selenized film as a function of Se flux and substrate temperature. As a proof-of-concept, thin film solar cells were fabricated with the double-layered absorber film and the devices exhibited reproducible conversion efficiency as high as about 2%.