Abstract We fabricated pure kesterite Cu2ZnSnS4 (CZTS) nanocrystals for solar cells by solvothermal synthesis. We investigated the effects of 0.5–2 mg/mL glycine complexing agent on the nanocrystals’ properties by comprehensive spectroscopic… Click to show full abstract
Abstract We fabricated pure kesterite Cu2ZnSnS4 (CZTS) nanocrystals for solar cells by solvothermal synthesis. We investigated the effects of 0.5–2 mg/mL glycine complexing agent on the nanocrystals’ properties by comprehensive spectroscopic and microscopic analysis, focusing on structural, morphological, compositional, and chemical properties. By controlling the glycine concentration, we obtained complete single-phase nanocrystals: high purity, good crystallinity, and copper-poor and Zn-rich composition. The nanocrystal diameter ranged ~50–60 nm. Thin films based on the nanocrystals were smooth, compact, free of cracks and holes, and had a grain size of up to 2.8 μm. The nanocrystals have an optical band gap between 1.51 and 2.27 eV and an absorption coefficient greater than 104 cm−1. The nanocrystal properties indicate promise for high-efficiency CZTS solar cells.
               
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