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This research presents the influence of copper(Cu)concentration on the properties of copper zinc tin sulfide(CZTS)nanoparticles(NPs)synthesized by a col-loidal method,employing oleylamine as an organic sol-vent.From the structural analysis,a pure phase of CZTS was obtained at an optimized molar ratio of 1.8∶1.1∶1∶4,and secondary phases were observed as the Cu concen-tration increased.The increment of the NPs size from 15 to 50 nm was noticed as a function of Cu concentration.Importantly,the optical bandgap energy was tuned from 1.35 to 1.68 eV with respect to Cu concentration.The sample synthesized at the molar ratio of 1.8∶1.1∶1∶4 showed a pure phase CZTS with desired elemental composition and bandgap.Furthermore,CZTS thin films were prepared by a doctor-blade method using synthesized NPs followed by annealing under a sulfur/nitrogen atmosphere.The annealed CZTS film showed a significant improvement in the morphological,electrical and optoelectronic properties.Thus,the annealed CZTS film can be efficiently used as an absorber layer in low-cost thin film solar cells.