Optimization of CBD CdS process in high-efficiency Cu(In,Ga)Se_2-based solar cells

摘要

We present an optimization of the CdS chemical bath deposition process as applied to high-efficiency Cu(In,Ga)Se_2 photovoltaic thin-film absorber materials. Specifically, we investigated deposition time (thickness), bath temperature (65, 80 and 90 deg. C) and a Cd~2+ partial-electrolyte treatment of the chalcopyrite absorber prior to CdS deposition. We found that thinner CdS layers (grown On as-deposited absorbers) allowing more light to reach the junction are not necessarily conductive to higher short-circuit current Density.