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HDH and BCS conceived of the study and participated in its design and coordination. All authors read and approved the final manuscript.”
“Background The quaternary Cu2ZnSnS4 (CZTS) compound, derived from CuInS2 by replacing In(III) with Zn(II) and Sn(IV), has the Ro 61-8048 price advantages of optimum direct band gap (around 1.5 eV) for use in single-junction solar cells, abundance of the constituent elements, and high absorption coefficient (>104 cm-1) [1–5]. Thus, increasing attention has been paid on CZTS materials in recent years [6–10]. Low-cost solar cells based on CZTS films as absorber layers have achieved an increasing conversion efficiency [11–15]. CZTS nanocrystalline materials have been found to show potentials for use in negative electrodes for lithium ion batteries [16] and counter electrodes for high-efficiency dye-sensitized solar cells [17–19] and as novel photocatalysts for hydrogen production [20].