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

Authors

  • Junghoon Lee,

    1. Interdisciplinary School of Green Energy and KIER-UNIST, Advanced Center for Energy, Ulsan National Institute of Science and Technology (UNIST), Ulsan 689-798, South Korea.
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  • Myoung Hee Yun,

    1. Interdisciplinary School of Green Energy and KIER-UNIST, Advanced Center for Energy, Ulsan National Institute of Science and Technology (UNIST), Ulsan 689-798, South Korea.
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  • Jonggi Kim,

    1. Interdisciplinary School of Green Energy and KIER-UNIST, Advanced Center for Energy, Ulsan National Institute of Science and Technology (UNIST), Ulsan 689-798, South Korea.
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  • Jin Young Kim,

    1. Interdisciplinary School of Green Energy and KIER-UNIST, Advanced Center for Energy, Ulsan National Institute of Science and Technology (UNIST), Ulsan 689-798, South Korea.
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  • Changduk Yang

    Corresponding author
    1. Interdisciplinary School of Green Energy and KIER-UNIST, Advanced Center for Energy, Ulsan National Institute of Science and Technology (UNIST), Ulsan 689-798, South Korea.
    • Interdisciplinary School of Green Energy and KIER-UNIST, Advanced Center for Energy, Ulsan National Institute of Science and Technology (UNIST), Ulsan 689-798, South Korea.
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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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