Panchromatic small-molecule organic solar cells based on a pyrrolopyrrole aza-BODIPY with a small energy loss

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  • Feng, Ru
    Department of Applied Chemistry, Graduate School of Engineering, Kyushu University School of Chemistry and Chemical Engineering, Jiangsu University
  • Mori, Tatsuya
    Department of Applied Chemistry, Graduate School of Engineering, Kyushu University INAMORI Frontier Research Center (IFRC), Kyushu University
  • Yasuda, Takuma
    Department of Applied Chemistry, Graduate School of Engineering, Kyushu University INAMORI Frontier Research Center (IFRC), Kyushu University
  • Furuta, Hiroyuki
    Department of Applied Chemistry, Graduate School of Engineering, Kyushu University Center for Molecular Systems (CMS), Kyushu University
  • Shimizu, Soji
    Department of Applied Chemistry, Graduate School of Engineering, Kyushu University Center for Molecular Systems (CMS), Kyushu University

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A small photon energy loss (Eloss) is one of the requisites for achieving near-infrared (NIR) small-molecule organic solar cells (SM-OSCs). Herein, we present two novel pyrrolopyrrole aza-BODIPY (PPAB)-based panchromatic chromophores, TT-2PPAB and DFBT-2PPAB, with an acceptor-donor-acceptor configuration for photovoltaic studies. Among them, in combination with [6,6]-phenyl-C_<71> butyric acid methyl ester (PC_<71>BM) acceptor, TT-2PPAB exhibits a moderate power conversion efficiency (PCE) of 3.11% due to an Eloss of 0.48 eV, which is smaller than the empirical limit of 0.6 eV. Based on the electrochemistry and theoretical calculations, we revealed that the efficient photovoltaic performance of the TT-2PPAB-based device can be ascribed to the sufficiently deep LUMO level of TT-2PPAB for charge transfer to PC_<71>BM.

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