Chapter 6 - Recent advances in synthesis, surface chemistry of cesium lead-free halide perovskite nanocrystals and their potential applications

Abstract

Cesium lead halide perovskite nanocrystals (NCs) have emerged as a key material for optoelectronic applications owing to their outstanding optical properties and easy synthesis in solution. Nowadays, the scientific community is facing a daring challenge toward the synthesis of lead-free perovskite NCs with high stability and excellent optical properties for the fabrication of optoelectronic devices with enhanced performance. In this sense, cesium lead-free halide perovskites (CsLFHPs) are demonstrated as extremely less susceptible toward oxygen and moisture and suitable candidates for long-term device applications. Thus, synthesis and identification of CsLFHP NCs essentially need understanding of surface chemistry to improve their structural and optical properties. Recent experimental findings on synthesis and properties of CsLFHP nanomaterials emphasizing that the chelation effect of organic ligands on the surface of perovskite NCs have to be thoroughly examined to improve their properties. This chapter summarizes recent advances that have been made in synthesis and surface chemistry of CsLFHP nanomaterials. The crucial role of solvents and organic ligands in synthesizing different morphologies of CsLFHP NCs are evaluated. Important experimental observations that are different from the already demonstrated cesium lead halide perovskite nanomaterials are outlined. Further suggestions in improving the surface properties of CsLFHP nanomaterials and their potential applications in several areas are also discussed.