[19a-136-1~12] 13.9 Compound solar cells

[19a-136-12] Effects of Cu Doping on CdTe Thin-Film Solar Cells in Substrate Configuration

〇Tamotsu Okamoto¹, Yusuke Hayashi¹, Daichi Watanabe¹, Ayuki Murata¹ (1.KIT, Kisarazu Col.)

Keywords:CdTe solar cells, substrate-type solar cells, II-VI compounds

In this work, we attempted to fabricate the substrate-type CdTe solar cells by close-spaced sublimation (CSS) method. In order to evaluate acceptor concentration in CdTe layer, we performed C-V measurements. The depletion layer widths markedly increased due to the heat treatment after CdS deposition, and decreased due to the second Cu doping. These results indicate that acceptor concentration decreased due to the heat treatment after CdS deposition, and increased due to the second Cu doping. Therefore, we concluded that the cell performance improved due to the increase in acceptor concentration by the second Cu doping.