CsPbX3纳米晶稳定性的研究进展

Research Progress on the Stability of CsPbX3 Nanocrystals

全无机钙钛矿纳米晶具有窄发射、高量子效率及较高的载流子迁移率等优点,在高清柔性显示器和太阳能电池等领域具有广泛的应用前景。然而,钙钛矿纳米晶的表面配体处于高度动态结合的状态,容易在分离和提纯等过程中造成大量配体缺失,从而导致量子效率和稳定性下降。此外,钙钛矿材料本身的离子晶体特性使其对极性溶剂非常敏感,这些问题严重制约了钙钛矿纳米晶在光电器件中的实际应用。本文从钙钛矿纳米晶表面态出发,结合国内外的研究工作,分析了路易斯酸、路易斯碱及表面包覆策略对钙钛矿纳米晶光学性质和稳定性的影响,并对进一步优化提升钙钛矿纳米晶的稳定性进行了展望。

All inorganic perovskite nanocrystals with narrow-emission,high quantum efficiency and high carrier mobility have been widely applied in the fields of light emitting diodes and solar cells.However,present surface ligands of the perovskite nanocrystals are in a dynamic bonding state,which easily fall off during separation and purification processes,resulting in the deterioration of quantum efficiency and stability.Besides,the ionic characteristic of halide perovskites makes it extremely sensitive to polar solvents.These disadvantages severely restrict the practical application of perovskite nanocrystals in optoelectronic devices.In this review,based on the surface state of perovskite nanocrystals,the effects of passivation strategies with Lewis acid,Lewis base and surface coating on optical properties,and stability of CsPbX3 perovskite nanocrystals are analyzed in detail combined with the domestic and abroad research work.Further optimization and improvement of the stability of CsPbX3 are prospected.