Synthesis of Pure Metastable Wurtzite CZTS Nanocrystals by Facile One-Pot Method

Abstract

In this article, pure phase metastable wurtzite Cu2ZnSnS4 (CZTS) nanocrystals (NCs) were synthesized by a facile one-pot method. When pure 1-dodecanethiol (DDT) was used as the solvent, two coexisting CZTS phases (wurtzite and kesterite) were found. When an increased amount of oleylamine (OAm) was added to DDT, kesterite CZTS disappeared gradually, and the as-obtained CZTS NCs became smaller and more uniform. When 0.5 mL of OAm was added, rice-like pure phase metastable wurtzite CZTS NCs were obtained. The factors, including amount of OAm, reaction temperature, reaction time, and concentration of precursors, which influence the morphology, size, and monodispersity of CZTS NCs, were studied in detail. The results showed OAm played an important role in the formation of the final pure phase metastable wurtzite NCs. Time-dependent experiments were performed to observe the growth of CZTS NCs. The final CZTS NCs evolved from spherical-like Cu2S NCs through rhombus-like intermediate shaped NCs to rice-like pure ...