aSchool of Materials Science and Engineering, Tianjin University, Tianjin 300072, PR China
bCollege of Information Technical Science, Nankai University, Tianjin 300071, PR China
Single-phase and well-dispersed CuInSe2 nanoplates were synthesized by a facile, ambient pressure solution chemical route using triethylene glycol as solvent, copper(II) chloride, indium(III) chloride and selenium powder as precursors, ethylenediamine as assisting agent and polyvinylpyrrolidone as capping agent. Structure and growing morphology of the products synthesized with and without polyvinylpyrrolidone addition were compared by TEM, XRD and SAED. The well-dispersed CuInSe2 nanoplates were applied to prepare ethanol-based colloidal ink and then deposit flat and highly crystallographic oriented CuInSe2 thin films by layer-by-layer dip-coating ink and then annealing at 500–580 °C in Ar atmosphere. I–V characteristics of the PV test devices with the ink-coated CuInSe2 light-absorbing layers were evaluated.