Xiao Qi, Tian Jingjing, Xue Qifan, Wang Jing, Xiong Bijin, Han Mengmeng, Li Zhen, Zhu Zonglong, Yip Hin-Lap, Li Zhong'an
Key Laboratory for Material Chemistry of Energy Conversion and Storage, Ministry of Education, School of Chemistry and Chemical Engineering, Huazhong University of Science and Technology, Wuhan, 430074, P. R. China.
Institute of Polymer Optoelectronic Materials and Devices, State Key Laboratory of Luminescent Materials and Devices, South China University of Technology, Guangzhou, 510640, P. R. China.
Angew Chem Int Ed Engl. 2019 Dec 2;58(49):17724-17730. doi: 10.1002/anie.201907331. Epub 2019 Oct 22.
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 V s . Thus as dopant-free HTMs for α-CsPbI Br-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.
对于全无机钙钛矿太阳能电池（PVSCs）而言，开发具有全面钝化效果的高性能无掺杂空穴传输材料（HTMs）是非常必要的。方酸菁（SQs）可能是无掺杂HTMs的一个候选材料，因为它们是钙钛矿的天然钝化剂。SQs的一个主要限制是其相对较低的空穴迁移率。在此，我们证明将SQs聚合成准二维（2D）p-π共轭聚合物可以克服这个问题。通过合理使用N，N-二芳基苯胺基方酸菁作为共聚单体，所得的聚方酸菁HTMs不仅表现出合适的能级和有效的钝化效果，而且实现了非常高的空穴迁移率，接近0.01 cm² V⁻¹ s⁻¹。因此，作为基于α-CsPbI₂Br的全无机PVSCs的无掺杂HTMs，所达到的最佳光电转换效率（PCE）为15.5%，优于基于掺杂的Spiro-OMeTAD（14.4%）的对照器件，并且在全无机PVSCs中处于最佳水平之一。
