One pot hydrothermal synthesis and characterization of Cu_2ZnSn(S,Se)_4 nanocrystalline thin films: Photovoltaic performance

摘要

Herein, one step hydrothermal route was employed to synthesize the Cu_2ZnSn(S,Se)_4 nanocrystalline thin films. Optoelectronic and photoresponse properties were studied to explore the role of hydrothermal deposition on the growth of CZTSSe films. The UV-Vis-NIR spectroscopy of the CZTSSe films shows direct and allowed type of optical transition with band gap energy of 1.52 eV. XRD analysis of CZTSSe films confirm the formation pure phase kesterite crystal structure. Morphological studies confirms well grown, densely packed nanospeheres formation. The photoelctrochemical cell performance of CZTSSe film photocathode was investigated by using two electrode system. The illumination of CZTSSe photoelectrode shows improvement in the photocurrent with photoconversion efficiency (η) of 4.52 %. The achieved results confirms the hydrothermally grown CZTSSe photoelectrode is an promising material for thin film solar cell technology.