材料科学
单重态
轨道能级差
辐射传输
三重态
有机太阳能电池
猝灭(荧光)
光电子学
光电流
光化学
聚合物
化学物理
原子物理学
激发态
光学
化学
荧光
物理
复合材料
分子
有机化学
作者
Bo Pang,Chentong Liao,Xiaopeng Xu,Shaoqian Peng,Jianlong Xia,Yuanyuan Guo,Yuan Xie,Yuting Chen,Chunhui Duan,Hongbin Wu,Ruipeng Li,Qiang Peng
标识
DOI:10.1002/adma.202211871
摘要
Suppressing the photon energy loss (Eloss ), especially the non-radiative loss, is of importance to further improve the device performance of organic solar cells (OSCs). However, typical π-conjugated semiconductors possess a large singlet-triplet energy gap (ΔEST ), leading to a lower triplet state than charge transfer state and contributing to a non-radiative loss channel of the photocurrent by the triplet state. Herein, a series of triplet polymer donors are developed by introducing a BNIDT block into the PM6 polymer backbone. The high electron affinity of BNIDT and the opposite resonance effect of the BN bond in BNIDT results in a lowered highest occupied molecular orbital (HOMO) and a largely reduced ΔEST . Moreover, the morphology of the active blends is also optimized by fine-tuning the BNIDT content. Therefore, non-radiative recombination via the terminal triplet loss channels and morphology traps is effectively suppressed. The PNB-3 (with 3% BNIDT):L8-BO device exhibits both small ΔEST and optimized morphology, favoring more efficient charge transfer and transport. Finally, the simultaneously enhanced Voc of 0.907 V, Jsc of 26.59 mA cm-2 , and FF of 78.86% contribute to a champion PCE of 19.02%. Therefore, introducing BN bonds into benchmark polymers is a possible avenue toward higher-performance of OSCs.
科研通智能强力驱动
Strongly Powered by AbleSci AI