Abstract
Cu2ZnSnS4 (CZTS) nanocrystals have been synthesized via a simple heating-up method using Cu (acac)2, Zn (OAc)2·2H2O and SnCl2·2H2O as metal precursors, and sulfur powder, thioacetamide (TAA), dodecanethiol (DDT) as sulfur sources under same reaction conditions.The influence of different sulfur sources on the phase structure, morphology and optical properties of CZTS nanocrystals were investigated. The phase structure and morphology of the as-obtained nanocrystals were characterized by XRD, Raman, EDS and TEM measurements. The results indicated that the as-prepared CZTS were kesterite structure with S powder and TAA as sulfur sources, while wurtzite CZTS formed with DDT as sulfur source. The different release rate of H2S with different sulfur sources gave rise to different growth rate of the CZTS NCs. The band-gaps of CZTS NCs synhesized from TAA and DDT showed a blue shift due to the size-induced quantum confinement effect.
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