聚合物
材料科学
混溶性
三元运算
接受者
轨道能级差
能量转换效率
聚合物太阳能电池
聚合
功勋
噻吩
化学工程
高分子化学
分子
化学
有机化学
光电子学
复合材料
计算机科学
物理
工程类
程序设计语言
凝聚态物理
作者
Chentong Liao,Yufei Gong,Xiaopeng Xu,Liyang Yu,Ruipeng Li,Qiang Peng
标识
DOI:10.1016/j.cej.2022.134862
摘要
All-polymer solar cells (All-PSCs) attracted increasing attention due to the outstanding thermal stability and mechanical properties. The current prevailing polymer acceptors for most efficient All-PSCs are polymerized high-performance small molecule acceptor of Y6, i.e. the dithienothiopheno[3,2-b]-pyrrolobenzothiadiazole (BTTP) based polymers. However, the BTTP-based polymers often show relatively shallow highest occupied molecular orbital (HOMO) energy level and high figure of merit (FOM), which limit the rational selection of paring donor polymers. Herein, we presented two low-cost polymer acceptors, namely as BTP-T2F and BTP-2T2F, based on lowly fused dithienopyrrolo[3,2b]benzothiadiazole (BTP, removing two thiophene cycles from BTTP). The BTP-based polymers exhibited deeper HOMO levels around −5.90 eV, which could match variable donor polymers with low-lying HOMO levels, such as low-cost PTQ10. Additionally, the synthesis was significantly simplified compared to BTTP-based polymers. A power conversion efficiency (PCE) of 14.32% was achieved in binary blend device containing PTQ10:BTP-2T2F. By adding a miscibility-enhancing PBDTCl-TPD as a third component, the top PCE of 16.04% was obtained in ternary blend All-PSCs. Combining the high device performance and low estimated cost, extraordinary cost-efficiency balance was realized within these BTP-based polymer acceptors.
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