Abstract
Pure-phase zincblende and wurtzite CuInS2 nanocrystals were synthesized by an environment-friendly, low-cost, ambient pressure triethylene glycol based solution route. Structure, morphology, chemical stoichiometry and optical property of the synthesized nanocrystals with different crystalline structure were characterized. The average size is 11.6nm for zincblende CuInS2 nanoparticles with size distribution ranged from 5.4nm to 19.6nm, and a broad size distribution ranged from 20nm to 150nm is for wurtzite CuInS2 nanoplates. Both zincblende and wurtzite CuInS2 have stoichiometric composition and strong absorption over the entire visible light spectrum and near infrared region. The synthesized CuInS2 nanocrystals were applied to prepare ethanol-based colloidal ink and then deposit thin films by dip-coating process. The synthesized thin films were annealed at 550°C in a selenization atmosphere. A power conversion efficiency of ~1.02% has been achieved by using zincblende CuInS2 nanocrystals as ink.
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