▎ 摘　　要

We have investigated photo-response of Cu2ZnSnS4 (CZTS) and have explored ways for enhancing the photo-response and conductivity using suitable nano-compositing strategies. In phase pure CZTS, gold nanoparticles and graphene flakes are used as nanofillers to make nano-composite samples. Photo-response of as-grown CZTS is improved by compositing gold with the observation of I-light/I-dark=1.29. With increasing gold nanoparticle size conductivity improved for CZTS gold composite. Compositing 1% graphene by weight has enhanced the current flow in the CTZS by 125 times. The graphene weight ratio in the composite is limited by absorbance reduction. The demonstrated high-quality CZTS nano-composite samples with improved optoelectrical properties holds tremendous promise for photovoltaic applications.