A Wide-bandgap D-A Copolymer Donor Based on Chlorine Substituted Acceptor Unit for High Performance Polymer Solar Cells
A Wide-bandgap D-A Copolymer Donor Based on Chlorine Substituted Acceptor Unit for High Performance Polymer Solar Cells
复制标题
用于高性能聚合物太阳能电池的基于氯取代受体单元的宽带隙 D-A 共聚物供体
DOI：
10.1039/c9ta03272j
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发表时间：
2019
影响因子：
11.9
通讯作者：
Jie Min
中科院分区：
文献类型：
--
作者：
Tao Wang;Rui Sun;Shengjie Xu;Jie Guo;Wei Wang;Jing Guo;Xuechen Jiao;Jianbo Wang;Shuangfeng Jia;Xiaozhang Zhu;Yongfang Li;Jie Min
通过材料设计实现同时提高开路电压（Voc）、短路电流密度（Jsc）和填充因子（FF）的三重功能是实现高效稳定的聚合物太阳能电池（PSCs）的关键挑战。在此，我们开发了一种新的宽带隙供体-受体（d -a）共聚物J101，通过氯取代其2-烷基-苯并[d][1,2,3]三唑（BTz）单元，其最高已占据分子轨道（HOMO）能级下降。J101给体与含独立电子的融合环电子受体ZITI结合制备的PSCs具有显著的功率转换效率（PCE）为14.43%，高Voc为0.937 V，高Jsc为21.25 mA cm−2，高FF为72.48%，这得益于给体的低HOMO水平，合适的纳米级形貌，高效的电荷输运性质和减少的重组损失。以J101:ZITI共混物为基础的半透明聚苯乙烯材料的PCE为11.04%，平均可见光透过率（AVT）为21.69%。这项工作表明，氯取代的BTz单元是高性能不透明和半透明psc的优秀电子接受构件。
Realizing the triple functions of simultaneously improved open circuit voltage (Voc), short circuit current density (Jsc) and fill factor (FF) enabled by material design is a vital challenge for achieving efficient and stable polymer solar cells (PSCs). Herein, we developed a new wide-bandgap donor–acceptor (D–A) copolymer, J101, with a down-shifted highest occupied molecular orbital (HOMO) level by chlorine substitution on its 2-alkyl-benzo[d][1,2,3]triazole (BTz) unit. The PSCs fabricated by combining the J101 donor with the indenoindene-containing fused-ring electron acceptor ZITI demonstrated a remarkable power conversion efficiency (PCE) of 14.43% with a high Voc of 0.937 V, a high Jsc of 21.25 mA cm−2 and a high FF of 72.48%, benefitting from the low HOMO level of the donor, suitable nanoscale morphology, efficient charge transport properties and reduced recombination losses. Furthermore, semitransparent PSCs based on the optimized J101:ZITI blend exhibited the best PCE of 11.04% with an average visible transmittance (AVT) of 21.69%. This work demonstrates that the chlorine substituted BTz unit is an excellent electron-accepting building block for high-performance opaque and semitransparent PSCs.