Frontiers of Optoelectronics Pub Date : 2022-09-23 , DOI: 10.1007/s12200-022-00038-z Wentao Fan 1 , Qiyuan Gao 1 , Xinyi Mei 1 , Donglin Jia 1 , Jingxuan Chen 1 , Junming Qiu 1 , Qisen Zhou 1 , Xiaoliang Zhang 1
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Formamidinium lead triiodide (FAPbI3) perovskite quantum dots (PQDs) show great advantages in photovoltaic applications due to their ideal bandgap energy, high stability and solution processability. The anti-solvent used for the post-treatment of FAPbI3 PQD solid films significantly affects the surface chemistry of the PQDs, and thus the vacancies caused by surface ligand removal inhibit the optoelectronic properties and stability of PQDs. Here, we study the effects of different anti-solvents with different polarities on FAPbI3 PQDs and select a series of organic molecules for surface passivation of PQDs. The results show that methyl acetate could effectively remove surface ligands from the PQD surface without destroying its crystal structure during the post-treatment. The benzamidine hydrochloride (PhFACl) applied as short ligands of PQDs during the post-treatment could fill the A-site and X-site vacancies of PQDs and thus improve the electronic coupling of PQDs. Finally, the PhFACl-based PQD solar cell (PQDSC) achieves a power conversion efficiency of 6.4%, compared to that of 4.63% for the conventional PQDSC. This work provides a reference for insights into the surface passivation of PQDs and the improvement in device performance of PQDSCs.
Graphical abstract
中文翻译：
用于太阳能电池的 FAPbI3 钙钛矿量子点的配体交换工程
甲脒三碘化铅 (FAPbI 3 ) 钙钛矿量子点 (PQD) 由于其理想的带隙能量、高稳定性和溶液加工性，在光伏应用中显示出巨大的优势。用于FAPbI 3 PQD固体薄膜后处理的反溶剂显着影响PQDs的表面化学，因此表面配体去除引起的空位会抑制PQDs的光电性能和稳定性。在这里，我们研究了具有不同极性的不同反溶剂对FAPbI 3的影响。PQDs 并选择一系列有机分子对 PQDs 进行表面钝化。结果表明，乙酸甲酯可以有效地从 PQD 表面去除表面配体，而不会在后处理过程中破坏其晶体结构。在后处理过程中用作 PQD 短配体的苯甲脒盐酸盐 (PhFACl) 可以填充 PQD 的 A 位和 X 位空位，从而改善 PQD 的电子耦合。最后，基于 PhFACl 的 PQD 太阳能电池 (PQDSC) 实现了 6.4% 的功率转换效率，而传统 PQDSC 的功率转换效率为 4.63%。该工作为深入了解PQDs的表面钝化和PQDSCs器件性能的提升提供了参考。
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