Thin films of Cu-In composite nanoparticles were produced by electrophoretic deposition in colloidal suspensions. The
nanoparticles were prepared with high power pulsed laser ablation in liquid solvents. The nanoparticles inherited
composition (Cu/In ratio) from the target during laser ablation. The colloidal suspension was stable against
agglomeration without adding additional surfactant or dispersing agent. The success of electrophoretic deposition of the
nanoparticles was explained based on electrochemical interactions between the nanoparticles and the electrode. CuInSe2solar absorber layers were produced after annealing the thin films in selenium vapor under atmospheric pressure. Solar
cell devices were made on Mo metal sheet and Mo-coated soda-lime glass substrates with an energy conversion
efficiency of up to 3.4% under AM1.5G illumination. The results open up a new route of non-vacuum fabrication of thin
film chalcopyrite solar cells on flexible substrates with minimized chemical contamination, easy compositional control,
and high raw material utilization.ationDa
A method of non-vacuum synthesis of CuInSe2 (CIS) thin films is presented. The method is based on electrophoretic
deposition (EPD) of Cu-In composite nanoparticles in liquid solvents. Colloidal suspensions of Cu-In composite
nanoparticles are prepared with pulsed laser ablation without additional stabilizing agents. The charge acquisition of the
nanoparticles in solvents, deposition of particles on electrode surfaces will be explained. After selenization in selenium
vapor in atmospheric pressure, polycrystalline CIS films and solar cell devices are produced. We will demonstrate EPD
as a new choice of low-cost synthesis of thin film solar absorbers.
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