Analysis of Improved Photoelectric Properties of Copper Phthalocyanine/C_(60) Organic Solar Cells: Effects of Substrate Temperature

摘要

Organic photovoltaic(OPV) cells are rapidly gaining attention due to their potential to be fabricated at low cost in thin, flexible, and light-weight forms. For efficient generation of photo-induced charges, C_(60) has been indispensable electron acceptors in building heterojunctions with various suitable electron donors, such as CuPc, and Alq_3 was always used as a new buffer layer to improve the degradation of heterojunction conductivity upon oxygen permeationIn this work, the photoelectric properties of organic solar cells(ITO/CuPc/C_(60)/ Al) were studied with a focus on the effect of substrate temperature. All the organic layers and the aluminum cathode were prepared onto ITO substrates by vacuum deposition at various substrate temperatures from room temperature to 363°C. With increasing the substrate temperature, an improvement in crystallization of bilayer films(CuPc/C_(60)) was observed by AFM. The results showed the photoconduction of the bilayer films increased because the bilayr films were well oriented, and the carrier mobility of the films were enhanced with the increase of the substrate temperature.