In this study, a novel and facile hot injection method for the synthesis of single phase CuSbSe2 crystallites was developed by using low toxic triethylene glycol (TEG) as both the solvent and reducing agent and triethylenetetramine (TETA) as co-reducing agent. The effects of the amounts of TETA addition and reaction temperatures on the phase development were investigated. The crystalline structures, morphologies, chemical compositions and optical characterization of the synthesized products were investigated using XRD, TEM, EDS, XPS, and UV-Vis-NIR. A single phase CuSbSe2 crystallites can be obtained by using triethylene glycol as the solvent and reducing agent and triethylenetetramine as co-reducing agent. TETA addition plays a key role in determining the final phase. The presence of the intermediate phase, Cu3SbSe4 phase could be due to the existence of Cu2+, resulting from the insufficient reducibility in the solution. A sufficient amount of TETA can facilitate the reduction of Cu2+ into Cu+, leading to the preformed Cu3SbSe4 phase dissolved and reacted with Sb2Se3 to form CuSbSe2. The obtained CuSbSe2 phase had a direct band gap with the band gap value of 1.06 eV.
All Science Journal Classification (ASJC) codes
- Chemical Engineering(all)