Structural-property correlations of all-inorganic CsPbBr3 perovskites via synergetic controls by PbBr2, 2-mercapto-3-methyl-4-thiazoleacetic acid and water

Abstract The low resistance to moisture will be the main obstacle for the perovskites used in device package and solar cell application. Most of literatures refer to the route that the quantum dots should be incorporated into a wide variety of stabilized hosts. However, the generation of protecting layers requires complicated treatments and decreases solubility or dispersity. Moreover, morphological control of perovskite nanocrystals with the assistance of covering substrate is a big challenge. Self-assembly of colloidal nanocrystals into ordered architectures has caused considerable interests and enabled new ways to manipulate the physicochemical properties for targeted applications. Herein, we describe how inorganic halide perovskites (CsPbBr3) with five different shapes (cubic, dot, sheet, ring and complex-coated) are formed by adjusting the sequence of PbBr2, 2-mercapto-3-methyl-4-thiazoleacetic acid (MMTA) and water. Realization of long-term stability and high efficiency requires innovative designs in both internal chemical structure and external interface engineering. PbBr2 improves the ionic nature of CsPbBr3 due to its cation supplement strategy. MMTA plays an important role in cross-linking process and the hydrogen bond/coordination interactions can passivate the interfacial surface for optimizing the microstructure. Water is not always detrimental in producing irreversible degradation. The shape evolution from the individual particles into much extended structure leads to the formation of complex-coated- CsPbBr3 (CC- CsPbBr3). It can retain 40% of its original emission intensity in water for 36 h, whereas the typical cubic CsPbBr3 exhibits poor performance during water tolerance experiments and has been completely quenched within 12 h. A wide color gamut system with 153% of National Television System Committee (NTSC) space is developed for CC- CsPbBr3.