Improvement of photovoltaic performances of organic thin-film solar cells by fast electron mobility oxadiazole as an exciton blocking layer material

摘要

We demonstrated improvements of photovoltaic performances of organic thin-film solar cells using an oxadiazole compound (Bpy-OXD) as an exciton blocking layer (EBL) material. Due to fast electron mobility of Bpy-OXD of above 10~(-3)cm~2/Vs, the photovoltaic cell with Bpy-OXD showed higher performance than that with bathocuproine, a conven-rntional EBL material. High amorphous nature of Bpy-OXD with high glass transition temperature of 106 ℃ probably also caused a part of the improvements because of protecting photovoltaic layers from damaging during upper metal electrode deposition.