Abstract
Quaternary Cu-In-Zn-S (CIZS) alloy quantum dots (QDs) have been chemically synthesized by a hydrothermal method at 120°C and heating-up method using diesel as a high-boiling-point reaction solvent at 220°C. The resulting CuInS2 (CIS) QDs with small Zn addition of 10% into the precursors possessed tetragonal structure, spherical morphology, and small size of 3 nm, as characterized by x-ray diffraction (XRD) analysis, Raman spectroscopy, and high-resolution transmission electron microscopy (HR-TEM). The absorption (Abs) and photoluminescence (PL) spectra of the CIZS alloy QDs both shifted to shorter wavelength (higher energy) in comparison with CIS QDs. The absorption edge and PL peak of the CIZS alloy QDs shifted to shorter wavelength, and the corresponding intensity increased with decreasing temperature in the range of 15 K to 300 K.
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