Abstract

The feasibility of a new fabrication route for films of the attractive solar absorber Cu 2ZnSnS 4 (CZTS) has been studied, consisting of electrodeposition of metallic precursors followed by annealing in sulfur vapour. Photoelectrochemical measurements using a Eu 3+ contact have been used to establish that the polycrystalline CZTS films are p-type with doping densities in the range (0.5–5) × 10 16 cm −3 and band gaps of 1.49 ± 0.01 eV, making them suitable for terrestrial solar energy conversion. It has been shown that a somewhat Cu-poor composition favours good optoelectronic properties.

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