Solution-Processed Organic/Crystalline-Silicon Heterojunction Solar Cells with Improved Light-Induced Stability

Recently, there has been considerable interest in organic/c-Si heterojunction solar cells using organic conductive polymer such as poly(3,4-ethylenedioxythiphene):poly(styrenesulfonate) (PEDOT:PSS) that blocks electrons but passes holes. This PEDOT:PSS/c-Si heterojunction works as a photovoltaic device without using p-n junction and TCO layer. η has reached at 10-13% without using textured c-Si, anti-reflection (AR) coating layer. These findings suggest that the PEDOT:PSS/c-Si heterojunctions is a promising for high-efficiency solution-processed solar cells. Thus, we termed this type of solar cell as c-Si heterojunction with organic thin-layers, “HOT” solar cell. In the present paper, we demonstrate the increased η with improved stability for air storage and light exposure of PEDOT:PSS/c-Si heterojunctuon solar cells by removal of PSS matrix from SC PEDOT:PSS thin film using a mixture of organosulfonic acid and organic solvent.