A Non‐Fullerene Acceptor with Chlorinated Thienyl Conjugated Side Chains for High‐Performance Polymer Solar Cells via Toluene Processing,Chinese Journal of Chemistry

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A Non‐Fullerene Acceptor with Chlorinated Thienyl Conjugated Side Chains for High‐Performance Polymer Solar Cells via Toluene Processing
Chinese Journal of Chemistry ( IF 5.5 ) Pub Date : 2020-03-07 , DOI: 10.1002/cjoc.201900495
Guangwei Li ₁ , Jingnan Wu ₁ , Jin Fang ₁ , Xia Guo ₁ , Lei Zhu ₂ , Feng Liu ₂ , Maojie Zhang ₁ , Yongfang Li _{1,

3}

Affiliation

Small molecular acceptors (SMAs) BTC‐2F and BTH‐2F, based on heptacyclic benzodi(cyclopentadithiophene) electron‐donating core (CBT) with chlorinated‐thienyl conjugated and thienyl conjugated side chains, respectively, are designed and synthesized. Compared with non‐chlorine acceptor BTH‐2F, BTC‐2F exhibits slightly blue‐shifted absorption spectra, similar the lowest unoccupied molecular orbital (LUMO) (–3.91 eV), deeper highest occupied molecular orbital (HOMO) energy level and higher electron mobility than that of BTH‐2F. PM6, a wide bandgap polymer, is selected as the donor material to construct bulk heterojunction polymer solar cells processed with nonhalogenated solvent toluene. The optimized PM6:BTC‐2F‐based device presents a 12.9% power conversion efficiency (PCE), while the PCE of PM6:BTH‐2F‐based device is only 11.3%. The results suggest that it is an effective strategy to optimize the photoelectric properties of SMAs by incorporating chlorine atom into the conjugated side chains.

中文翻译：

含氯噻吩共轭侧链的非富勒烯受体，用于通过甲苯加工的高性能聚合物太阳能电池

设计并合成了基于七环苯并二（环戊二噻吩）供电子核（CBT）的小分子受体（SMAs）BTC-2F和BTH-2F，它们分别带有氯噻吩共轭和噻吩共轭侧链。与非氯受体BTH-2F相比，BTC-2F的吸收光谱略有蓝移，类似于最低的未占据分子轨道（LUMO）（–3.91 eV），更深的最高占据分子轨道（HOMO）能级和更高的电子迁移率比BTH-2F 选择PM6（一种带隙宽的聚合物）作为施主材料，以构建用非卤代溶剂甲苯处理的本体异质结聚合物太阳能电池。经过优化的基于PM6：BTC-2F的设备的功率转换效率（PCE）为12.9％，而基于PM6：BTH-2F的设备的PCE仅为11.3％。

更新日期：2020-03-07

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