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Toward the Realization of a practical diketopyrrolopyrrole-based small molecule for improved efficiency in ternary
Junghoon Lee1, Myoung Hee Yun1, Jonggi Kim1
1Interdisciplinary School of Green Energy and KIER-UNIST, Advanced Center for Energy, Ulsan National Institute of Science and Technology (UNIST), Ulsan 689-798, South Korea.
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.
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