Fabrication and Optimization of Polymer Solar Cells Based on P3HT:PC70BM System

摘要

Efficient bulk heterojunction (BHJ) polymer solar cells (PSCs) based on P3HT:PC70 BM were fabricated by optimizing the processing parameters. The optimized thickness and annealing temperature have been found to be about 200 nm and 130 degrees C. The effect of cathode interfacial layers on device performance is related to the formation of interfacial dipole. Furthermore, the effect of optimum ZnO interfacial thickness (similar to 30 nm) on device performance is attributed to good interfacial conductivity and its optical property. The metal electrode deposited in the slow rate has a better influence on device performance. Based on these optimal conditions, the best power conversion efficiency (PCE) of 3.91% was obtained under AM1.5G and 100mW/cm(2) illumination. This detailed investigation provides an important reference for the fabrication and optimization of polymer photovoltaic devices.