Synthesis of CZTSe nanoparticles through solvothermal route

In this paper, a simple, practical, and fast solvothermal route is presented for synthesizing the Cu2ZnSnSe4 nanoparticles. In this method, the precursors were dissolved in triethylenetetramine and placed in autoclave at 240 °C for 1 h under controlled pressure and constant stirring. The obtained CZTSe nanoparticles were characterized by X-ray diffraction (XRD), scanning electron microscope (SEM), energy-dispersive X-ray spectroscopy (EDX), and diffuse reflectance spectroscopy (DRS). The XRD and EDX analyses confirm the successful synthesis of pure kesterite structure. The particle size of CZTSe nanoparticles is in the range of 225 nm to 2 µm. The band-gap energy obtained from the DRS is about 1.2 eV which is very suitable for photovoltaic applications.