Bai Yang, Hao Mengmeng, Ding Shanshan, Chen Peng, Wang Lianzhou
Australian Institute for Bioengineering and Nanotechnology, The University of Queensland, St Lucia, Brisbane, Queensland, 4072, Australia.
School of Chemical Engineering, The University of Queensland, St Lucia, Brisbane, Queensland, 4072, Australia.
Adv Mater. 2022 Jan;34(4):e2105958. doi: 10.1002/adma.202105958. Epub 2021 Nov 28.
The presence of surface ligands not only plays a key role in keeping the colloidal integrity and non-defective surface of metal halide perovskite quantum dots (PQDs), but also serves as a knob to tune their optoelectronic properties for a variety of exciting applications including solar cells and light-emitting diodes. However, these indispensable surface ligands may also deteriorate the stability and key properties of PQDs due to their highly dynamic binding and insulating nature. To address these issues, a number of innovative surface chemistry engineering approaches have been developed in the past few years. Based on an in-depth fundamental understanding of the surface atomistic structure and surface defect formation mechanism in the tiny nanoparticles, a critical overview focusing on the surface chemistry engineering of PQDs including advanced colloidal synthesis, in-situ surface passivation, and solution-phase/solid-state ligand exchange is presented, after which their unprecedented achievements in photovoltaics and other optoelectronics are presented. The practical hurdles and future directions are critically discussed to inspire more rational design of PQD surface chemistry toward practical applications.
表面配体的存在不仅在保持金属卤化物钙钛矿量子点（PQD）的胶体完整性和无缺陷表面方面起着关键作用，而且还作为一个调节旋钮，用于调整其光电特性，以实现包括太阳能电池和发光二极管在内的各种令人兴奋的应用。然而，这些不可或缺的表面配体由于其高度动态的结合和绝缘性质，也可能会降低PQD的稳定性和关键性能。为了解决这些问题，在过去几年中已经开发了许多创新的表面化学工程方法。基于对微小纳米颗粒表面原子结构和表面缺陷形成机制的深入基础理解，本文对PQD的表面化学工程进行了批判性概述，包括先进的胶体合成、原位表面钝化以及溶液相/固态配体交换，之后介绍了它们在光伏和其他光电子学方面取得的前所未有的成就。文中还批判性地讨论了实际障碍和未来方向，以激发对PQD表面化学进行更合理的设计，以实现实际应用。
