Yu XinYu, Gao Danpeng, Li Zhen, Sun Xianglang, Li Bo, Zhu Zonglong, Li Zhong'an
Key Laboratory for Material Chemistry of Energy Conversion and Storage, Ministry of Education, Hubei Key Laboratory of Material Chemistry and Service Failure, School of Chemistry and Chemical Engineering, Huazhong University of Science and Technology, Wuhan, 430074, P. R. China.
Department of Chemistry, City University of Hong Kong Kowloon, 999077, Hong Kong SAR, Hong Kong.
Angew Chem Int Ed Engl. 2023 Mar 6;62(11):e202218752. doi: 10.1002/anie.202218752. Epub 2023 Feb 6.
The commercialization of perovskite solar cells (PVSCs) urgently requires the development of green-solvent processable dopant-free hole transporting materials (HTMs). However, strong intermolecular interactions that ensure high hole mobility always compromise the solubility and film-forming ability in green solvents. Herein, we show a simple but effective design strategy to solve this trade-off, that is, constructing star-shaped D-A-D structure. The resulting HTMs (BTP1-2) can be processed by green solvent of 2-methylanisole (2MA), a kind of food additive, and show high hole mobility and multiple defect passivation effects. An impressive efficiency of 24.34 % has been achieved for 2MA-processed BTP1 based inverted PVSCs, the highest value for green-solvent processable HTMs so far. Moreover, it is manifested that the charge separation of D-A type HTMs at the photoinduced excited state can help to passivate the defects of perovskites, indicating a new HTM design insight.
钙钛矿太阳能电池（PVSCs）的商业化迫切需要开发可通过绿色溶剂加工的无掺杂空穴传输材料（HTMs）。然而，确保高空穴迁移率的强分子间相互作用总是会损害在绿色溶剂中的溶解度和成膜能力。在此，我们展示了一种简单而有效的设计策略来解决这种权衡，即构建星形D-A-D结构。所得的HTMs（BTP1-2）可以用一种食品添加剂2-甲基苯甲醚（2MA）这种绿色溶剂进行加工，并表现出高空穴迁移率和多种缺陷钝化效果。基于2MA加工的BTP1的倒置PVSCs实现了令人印象深刻的24.34%的效率，这是迄今为止绿色溶剂可加工HTMs的最高值。此外，结果表明D-A型HTMs在光致激发态的电荷分离有助于钝化钙钛矿的缺陷，这表明了一种新的HTM设计思路。
