Dopant‐Free Squaraine‐Based Polymeric Hole‐Transporting Materials with Comprehensive Passivation Effects for Efficient All‐Inorganic Perovskite Solar Cells

Development of high‐performance dopant‐free hole‐transporting materials (HTMs) with comprehensive passivation effects is highly desirable for all‐inorganic perovskite solar cells (PVSCs). Squaraines (SQs) could be a candidate for dopant‐free HTMs as they are natural passivators for perovskites. One major limitation of SQs is their relatively low hole mobility. Herein we demonstrate that polymerizing SQs into pseudo two dimensional (2D) p–π conjugated polymers could overcome this problem. By rationally using N,N‐diarylanilinosquaraines as the comonomers, the resulting polysquaraine HTMs not only exhibit suitable energy levels and efficient passivation effects, but also achieve very high hole mobility close to 0.01 cm^?2 V^?1 s^?1. Thus as dopant‐free HTMs for α‐CsPbI₂Br‐based all‐inorganic PVSCs, the best PCE reached is 15.5 %, outperforming those of the doped‐Spiro‐OMeTAD (14.4 %) based control devices and among the best for all‐inorganic PVSCs.     

聚方酸太阳电池材料的合成与表征

通过Yamamoto偶联反应,合成了主链含有1,2-取代方酸和1,3-取代方酸结构单元的新型共轭聚合物光伏材料PTST.其结构经过红外光谱和核磁共振表征得以确证.热分析、紫外-可见吸收光谱和电化学性质研究表明,所得新型共轭聚合物PTST具有良好的热稳定性;在270～700 nm光谱范围内有宽而强的吸收,基本覆盖了整个可见光区域;取代方酸结构单元的引入可使聚合物的最低未占有轨道(LUMO)和能隙(Eg)降低.当PTST仅为60%掺混时,即可使聚(3-己基噻吩)的荧光完全淬灭,说明P3HT与PTST之间存在明显的光电子转移.