Regulating Intramolecular Charge Transfer and Resonance Effects to Realize Ultrawide Bandgap Conjugated Polymer for High‐Performance All‐Polymer Solar Cells
作者:Shuai Zhang、Mian Cai、Chenyu Shang、Fuzhen Bi、Fan Feng、Zhengkun Du、Cheng Sun、Yonghai Li、Xichang Bao
DOI:10.1002/adfm.202301701
日期:2023.8
efficient polymer donors (PDs). Particularly, there are rare reports of high-performance PDs with ultrawide bandgaps, which are indispensable to maximally harvest high-energy photons for better light utilization. Herein, the significance of intramolecular charge transfer and quinoid resonance effects in regulating bandgaps of donor-acceptor conjugated materials is highlighted, and a novel polymer donor
全聚合物太阳能电池(APSC)由于卓越的稳定性和机械灵活性而受到越来越多的关注。然而,APSC 的功率转换效率 (PCE) 落后,归因于有效聚合物供体 ( PD ) 有限。特别是高性能PD的报道还很少见。具有超宽带隙,这对于最大限度地收集高能光子以实现更好的光利用是必不可少的。在此,强调了分子内电荷转移和醌型共振效应在调节供体-受体共轭材料带隙中的重要性,并报道了一种基于苯基/吡啶稠合菲啶(PD)部分的新型聚合物供体PBPD。因此,PBPD 具有高达 2.24 eV 的超宽光学带隙和 487-523 nm 的强吸收率,这恰好遵循太阳光谱的最强辐射。高能光子的放大光利用使基于PBPD:PY-IT的APSC具有15.29%的高功率转换效率,在超宽带隙P D的APSC中名列前茅,挑战了典型的PD s 带隙约为 1.80 eV。得益于PBPD独特的光响应和分子取向,含有PBPD的三元APSC获得了