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Fibril Network Strategy Enables High‐Performance Semitransparent Organic Solar Cells
Author(s) -
Xie Yuanpeng,
Cai Yunhao,
Zhu Lei,
Xia Ruoxi,
Ye Linglong,
Feng Xiang,
Yip HinLap,
Liu Feng,
Lu Guanghao,
Tan Songting,
Sun Yanming
Publication year - 2020
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.202002181
Subject(s) - materials science , organic solar cell , acceptor , transmittance , energy conversion efficiency , nanostructure , optoelectronics , absorption (acoustics) , band gap , nanotechnology , polymer , composite material , physics , condensed matter physics
The development of semitransparent organic solar cells (ST‐OSCs) represents a significant step toward the commercialization of OSCs. However, the trade‐off between power conversion efficiency (PCE) and average visible transmittance (AVT) restricts further improvements of ST‐OSCs. Herein, it is demonstrated that a fibril network strategy can enable ST‐OSCs with a high PCE and AVT simultaneously. A wide‐bandgap polymer PBT1‐C‐2Cl that can self‐assemble into a fibril nanostructure is used as the donor and a near‐infrared small molecule Y6 is adopted as the acceptor. It is found that a tiny amount of PBT1‐C‐2Cl in the blend can form a high speed pathway for hole transport due to the well distributed fibril nanostructure, which increases the transmittance in the visible region. Meanwhile, the acceptor Y6 guarantees sufficient light absorption. Using this strategy, the optimized ST‐OSCs yield a high PCE of 9.1% with an AVT of over 40% and significant light utilization efficiency of 3.65% at donor/acceptor ratio of 0.25:1. This work demonstrates a simple and effective approach to realizing high PCE and AVT of ST‐OSCs simultaneously.