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Near‐Infrared Small Molecule Acceptor Enabled High‐Performance Nonfullerene Polymer Solar Cells with Over 13% Efficiency
Author(s) -
Gao Wei,
Liu Tao,
Ming Ruijie,
Luo Zhenghui,
Wu Kailong,
Zhang Lin,
Xin Jingming,
Xie Dongjun,
Zhang Guangye,
Ma Wei,
Yan He,
Yang Chuluo
Publication year - 2018
Publication title -
advanced functional materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 6.069
H-Index - 322
eISSN - 1616-3028
pISSN - 1616-301X
DOI - 10.1002/adfm.201803128
Subject(s) - materials science , energy conversion efficiency , polymer solar cell , acceptor , small molecule , polymer , absorption (acoustics) , optoelectronics , organic solar cell , crystallization , chemical engineering , chemistry , composite material , biochemistry , physics , engineering , condensed matter physics
One of the most promising approaches to achieve high‐performance polymer solar cells (PSCs) is to develop nonfullerene small molecule acceptors (SMAs) with an absorption extending to the near‐infrared (NIR) region. In this work, two novel SMAs, namely, BTTIC and BTOIC, are designed and synthesized, with optical bandgaps ( E g opt ) of 1.47 and 1.39 eV, respectively. Desipte the narrow E g opt , the PBDB‐T:BTTIC‐ and PBDB‐T:BTOIC‐based PSCs can maintain high V OC s of over 0.90 and 0.86 V, respectively, with low energy losses ( E loss ) < 0.6 eV. Meanwhile, due to the favorable morphology of the PBDB‐T:BTTIC blend, balanced carrier mobilities are achieved. The high external quantum efficiencies enable a high power conversion efficiency (PCE) up to 13.18% for the PBDB‐T:BTTIC‐based PSCs. In comparison, BTOIC shows an excessive crystallization propensity owing to its oxyalkyl side groups, which eventually leads to a relatively low PCE for the PBDB‐T:BTOIC‐based PSCs. Overall, this work provides insights into the design of novel NIR‐absorbing SMAs for nonfullerene PSCs.