Toward the Realization of A Practical Diketopyrrolopyrrole-Based Small Molecule for Improved Efficiency in Ternary BHJ Solar Cells

Abstract

An easily accessible DPP-based small molecule (DMPA-DTDPP) has been synthesized by a simple and efficient route. The resulting molecule, when incorporated into a P3HT:PCBM-based BHJ solar cell, is found to significantly improve the efficiency. The utility of DMPA-DTDPP as an additive yields an increase in the short circuit current density (Jsc) because DMPA-DTDPP serves as an energy funnel for P3HT excitons at the P3HT:PCBM interfaces, resulting in an improved overall power conversion efficiency, compared to the P3HT:PCBM control device. Considering the trouble-free and cost effective synthesis of DMPA-DTDPP, it may prove very useful in high-performance solar cells.