Size and shape controlled hydrothermal synthesis of kesterite Cu2ZnSnS4 nanocrystals

Abstract

Quaternary kesterite Cu₂ZnSnS₄ (CZTS) nanocrystals (NCs) have been synthesized using a simple, size and shape tunable, and low-cost hydrothermal technique without using toxic chemicals. The size and shape of the kesterite CZTS NCs could be controlled by using different complexing agents including non-complexing agent, hydrazine hydrate, tri-sodium citrate (Na₃-citrate), and tetra-acetate disodium salt (Na₂EDTA). The hydrothermally synthesized CZTS nanocrystals showed a kesterite structure, high optical absorption, and suitable band gap energy characteristics, indicating potential for application to thin film solar cells.