苯并三唑
化学
聚合物
带隙
接受者
吸收(声学)
聚合
能量转换效率
电子受体
短路
聚合物太阳能电池
化学工程
材料科学
高分子化学
光化学
电压
光电子学
有机化学
复合材料
凝聚态物理
工程类
物理
量子力学
作者
Huiting Fu,Yuxiang Li,Jianwei Yu,Ziang Wu,Qunping Fan,Francis Lin,Han Young Woo,Feng Gao,Zonglong Zhu,Alex K.‐Y. Jen
摘要
Despite the significant progresses made in all-polymer solar cells (all-PSCs) recently, the relatively low short-circuit current density (Jsc) and large energy loss are still quite difficult to overcome for further development. To address these challenges, we developed a new class of narrow-bandgap polymer acceptors incorporating a benzotriazole (BTz)-core fused-ring segment, named the PZT series. Compared to the commonly used benzothiadiazole (BT)-containing polymer PYT, the less electron-deficient BTz renders PZT derivatives with significantly red-shifted optical absorption and up-shifted energy levels, leading to simultaneously improved Jsc and open-circuit voltage in the resultant all-PSCs. More importantly, a regioregular PZT (PZT-γ) has been developed to achieve higher regiospecificity for avoiding the formation of isomers during polymerization. Benefiting from the more extended absorption, better backbone ordering, and more optimal blend morphology with donor component, PZT-γ-based all-PSCs exhibit a record-high power conversion efficiency of 15.8% with a greatly enhanced Jsc of 24.7 mA/cm2 and a low energy loss of 0.51 eV.
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