A Series of New Medium-Bandgap Conjugated Polymers Based on Naphtho[1,2-c:5,6-c]bis(2-octyl-[1,2,3]triazole) for High-Performance Polymer Solar Cells

摘要

Bulk-heterojunction polymer solar cells (PSCs) have attracted considerable attention due to their potential for fabrication of light-weight, large-area and flexible light-harvesting devices through low-cost solution processing.in the past few years, significant improvements in power conversion efficiencies (PCEs) of PSCs have been achieved due to the invention of novel donor polymers, the usage of new device structures, the optimization of fabrication processing techniques, and the incorporation of effective interlayers. So far, the PCEs of single-junction PSCs had already exceeded 8% based on the blend of newly developed low-bandgap donor polymers and fullerene derivatives.Since it is very challenging to address the short-circuit current density (J_(sc)) /open-circuit voltage (V_(oc)) trade-off problem of narrow-bandgap donor polymers in single-junction PSCs,which will limit the use of full solar spectrum, multi-junction devices with a tandem structure by stacking two or more cells with bulk-heterojunc-ti'on layers having complementary absorption spectra have been considered as a promising way to further enhance the performance of PSCs.