Engineering Band Gap and Energy Levels of Conjugated Polymers for Organic Solar Cells:A Case Study of Benzodithiophene Based Polymers
【摘要】:正The bulk heterojunction(BHJ) organic photovoltaic cells of regioregular poly(3-hexylthiophene)(RR-P3HT) and[6,6]-phenyl C61-butyric acid methyl ester(PCBM) represent one of the most successful systems with reproducible efficiencies approaching 5%after careful optimization.However,with a fixed bandgap of 1.9 eV, P3HT can only harvest a small portion of the solar spectrum(maximum 22.4%).In recent years,low bandgap