基于单结二元和三元聚合物太阳能电池的 D-A 结构共聚物，具有低 HOMO 能级和两个非富勒烯受体,Molecular Systems Design & Engineering

当前位置： X-MOL 学术 › Mol. Syst. Des. Eng. › 论文详情

Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)

基于单结二元和三元聚合物太阳能电池的 D-A 结构共聚物，具有低 HOMO 能级和两个非富勒烯受体
Molecular Systems Design & Engineering ( IF 3.2 ) Pub Date : 2022-09-21 , DOI: 10.1039/d2me00166g
Mukhamed L. Keshtov, Dmitry Y. Godovsky, Ilya E. Ostapov, Vladimir G. Alekseev, Hemraj Dahiya, Rahul Singhal, Fang-Chung Chen, Ganesh D. Sharma

制备了以苯并二噻吩二酮(BDD)为强受体、二噻吩苯(DTB)为弱供体的供体-受体(D-A)共轭共聚物P(DTB-BDD) ，并对其光学和电化学性质进行了分析。P(DTB-BDD)表现出更深的最高占据分子轨道和 1.74 eV 的光学带隙。通过将P(DTB-BDD)与两种非富勒烯受体（即窄带隙 Y6 和中等带隙 DBTBT-IC ）混合来制造聚合物太阳能电池 (PSC) 。使用基于P(DTB-BDD)的本体异质结有源层的 PSC 的功率转换效率 (PCE) ：DBTBT-IC 和P(DTB-BDD):Y6分别为13.16%和12.62%。与 Y6 对应物相比，基于 DBTBT-IC 的 PSC 的开路电压更大是由于 DBTBT-IC 的 LUMO 能级上移，而基于 Y6 的 PSC 的高短路电流可能与Y6 的扩展吸收曲线。利用基于DBTBT-IC和Y6的器件的高开路电压和短路电流，通过优化两个受体之间的重量比并保持P（DTB-BDD）的量恒定来制备三元PSC ；基于P(DTB-BDD)生成的三元 PSC : DBTBT-IC : Y6 (1.0 : 0.2 : 1.0) 的 PCE 提高了 16.32%，高于二元 PSC。三元器件 PCE 的富集可能伴随着通过从 DBTBT-IC 到 Y6 的能量转移有效利用激子，并增加 D/A 界面面积以实现更有效的电荷转移。基于三元的 PSC 的开路电压介于 Y6 和基于 DBTBT-IC 的 PSC 之间，表明两种受体形成了合金。

"点击查看英文标题和摘要"

Single junction binary and ternary polymer solar cells-based D–A structured copolymer with low lying HOMO energy level and two nonfullerene acceptors

A donor–acceptor (D–A) conjugated copolymer denoted as P(DTB-BDD) consisting of benzodithiophenedione (BDD) as a strong acceptor and dithienobenzene (DTB) as a weak donor was prepared, and its optical and electrochemical properties were analyzed. P(DTB-BDD) exhibited a deeper highest occupied molecular orbital and an optical bandgap of 1.74 eV. Polymer solar cells (PSCs) were fabricated through blending P(DTB-BDD) with two non-fullerene acceptors, i.e., narrow bandgap Y6 and medium bandgap DBTBT-IC. The power conversion efficiencies (PCEs) of the PSCs using the bulk heterojunction active layer based on P(DTB-BDD):DBTBT-IC and P(DTB-BDD):Y6 were 13.16% and 12.62%, respectively. The larger open circuit voltage of the DBTBT-IC based PSCs as compared with that of the Y6 counterpart was due to the up-shifted LUMO energy level of DBTBT-IC, and the high short circuit current for the Y6 based PSCs may be associated with the extended absorption profile of Y6. Taking advantage of the high open circuit voltage and short circuit current of the devices based on DBTBT-IC and Y6, the ternary PSCs were prepared by optimizing the weight ratios between two acceptors and maintaining a constant amount of P(DTB-BDD); the resulting ternary PSCs based on P(DTB-BDD) : DBTBT-IC : Y6 (1.0 : 0.2 : 1.0) showed an improved PCE of 16.32%, which is greater than those for the binary PSCs. The enrichment in the PCE of the ternary device may be concomitant with the effective exploitation of excitons via energy transfer from DBTBT-IC to Y6 and increased the D/A interfacial area for more effective charge transfer. The open circuit voltage of the PSC based on ternary lies in between that for the Y6 and DBTBT-IC-based PSCs, demonstrating the formation of an alloy for the two acceptors.

更新日期：2022-09-21

点击分享查看原文

点击收藏

阅读更多本刊新发论文