材料科学
重组
有机太阳能电池
光电子学
工程物理
高能
纳米技术
聚合物
复合材料
生物
遗传学
基因
工程类
作者
Zhe Sun,Hyunggun Ma,Sangjin Yang,Yongjoon Cho,Seunglok Lee,Jaeyeong Park,Thi Le Huyen,Wonjun Kim,Seonghun Jeong,Seoyoung Kim,Changduk Yang
标识
DOI:10.1002/adfm.202403093
摘要
Abstract In the pursuit of high‐efficiency polythiophene (PT) organic solar cells (OSCs), a critical challenge is the reduction of nonradiative recombination. This study comprehensively explores polydithienylthiazolothiazole (PTTz)‐based PT terpolymers: PTTz‐Tz and PTTz‐TzT, in which it is demonstrate that molecular structure alterations greatly influence the aggregation kinetics and orientation of these polymers. Specifically, PTTz‐TzT achieves rapid ordering aggregation during spin coating, effectively suppressing excessive polymer aggregation and facilitating appropriate phase separation upon mixing with the acceptor. Meanwhile, PTTz‐TzT inherently adopts a face‐on orientation, resulting in more structured π–π stacking in the vertical direction after acceptor integration, compared to the intrinsic edge‐on orientation of PTTz‐Tz. These factors collectively contribute to lower Urbach energy and a substantial reduction of nonradiative recombination in PTTz‐TzT‐based OSCs, culminating in a high photovoltaic conversion efficiency (PCE) exceeding 16%. Furthermore, a prominent PCE of 19.11% is obtained by PTTz‐TzT via ternary blend strategy, which is among the highest values reported for the OSCs. This investigation underscores the significance of aggregation kinetics and orientation in PT‐based polymers, especially regarding Urbach energy and nonradiative recombination, and offers novel insights for designing high‐performance polythiophene donors.
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