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Antisolvent-Assisted In Situ Cation Exchange of Perovskite Quantum Dots for Efficient Solar Cells
Advanced Materials ( IF 27.4 ) Pub Date : 2023-02-26 , DOI: 10.1002/adma.202212160
Donglin Jia 1 , Jingxuan Chen 1 , Rongshan Zhuang 2 , Yong Hua 2 , Xiaoliang Zhang 1
Affiliation  

Cesium-formamidinium lead iodide perovskite quantum dots (FAxCs1−xPbI3 PQDs) show high potential for next-generation photovoltaics due to their outstanding optoelectronic properties. However, achieving composition-tunable hybrid PQDs with desirable charge transport remains a significant challenge. Herein, by leveraging an antisolvent-assisted in situ cation exchange of PQDs, homogeneous FAxCs1−xPbI3 PQDs with controllable stoichiometries and surface ligand chemistry are realized. Meanwhile, the crystallographic stability of PQDs is substantially improved by substituting the cations of the PQDs mediated by surface vacancies. Consequently, PQD solar cell delivers an efficiency of 17.29%, the highest value among the homostructured PQD solar cells. The high photovoltaic performance is attributed to the broadened light harvesting spectra, flattened energy landscape, and rationalized energy levels of highly oriented PQD solids, leading to efficient charge carrier extraction. This work provides a feasible approach for the stoichiometry regulation of PQDs to finely tailor the optoelectronic properties and tolerance factors of PQDs toward high-performing photovoltaics.

中文翻译:

用于高效太阳能电池的钙钛矿量子点的反溶剂辅助原位阳离子交换

铯-甲脒碘化铅钙钛矿量子点 (FA x Cs 1− x PbI 3 PQDs) 由于其出色的光电特性,在下一代光伏领域显示出巨大的潜力。然而,实现具有理想电荷传输的成分可调混合 PQD 仍然是一个重大挑战。在此,通过利用 PQD 的反溶剂辅助原位阳离子交换,均相 FA x Cs 1− x PbI 3实现了具有可控化学计量和表面配体化学的 PQD。同时,通过取代由表面空位介导的 PQD 阳离子,PQD 的晶体稳定性得到显着提高。因此,PQD 太阳能电池的效率为 17.29%,是同质结构 PQD 太阳能电池中的最高值。高光伏性能归因于加宽的光收集光谱、平坦的能量景观以及高度定向的 PQD 固体的合理化能级,从而导致有效的载流子提取。这项工作为 PQD 的化学计量调节提供了一种可行的方法,以精细调整 PQD 的光电特性和容差因子以实现高性能光伏。
更新日期:2023-02-26
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