Deciphering the co-formation of layered two-dimensional hybrid CdCl2(hexylamine)2 and CdS nanocrystals

Abstract

While conventional quantum dots like CdS and ZnSe exhibit remarkable optical properties, their limitations in charge transport and size homogeneity pose challenges in device applications. Two-dimensional (2D) organic-inorganic hybrid derivatives offer a promising solution by enabling charge mobility in two dimensions while maintaining bandgap tunability and uniformity in size. Thus, the objective of this work is to synthesize one such 2D derivative of a IIB-VIA semiconductor – Cd2S2(hexylamine) and investigate the temperature-dependence of luminescent properties. However, structural and optical characterization following syntheses revealed that a 2D hybrid compound CdCl2(hexylamine)2 forms along with CdS nanoparticles. Further, optical studies indicate the formation of excitons in the system originating from the CdS nanocrystals. The variation in luminescent behaviour of these excitons is investigated at different temperatures below 300K.