Optimization of CdTe thin-film solar cell efficiency using a sputtered, oxygenated CdS window layer: Optimization of CdTe thin-film solar cell efficiency using a sputtered, oxygenated CdS window layer

摘要: A major source of loss in cadmium sulfide/cadmium telluride (CdS/CdTe) solar cells results from light absorbed the CdS window layer, which is not converted to electrical current. This film can be made more transparent by oxygen incorporation during sputter deposition at ambient temperature. Prior this work, material has produced high-efficiency devices on tin oxide-coated soda-lime-glass substrates used industrially. Numerous were fabricated over a variety process conditions produce an optimized device. Although does show consistent increase band gap with oxygenation, absorption layer virtually eliminated relevant spectrum, leading short-circuit Meanwhile, fill factor maintained, and open-circuit voltage increases relative baseline sublimated CdS. The trend device parameters oxygenation thickness increasing conduction offset window/CdTe interface. Optimization considering both initial efficiency stability resulted National Renewable Energy Laboratory verified 15.2%-efficient cell 3.2-mm soda-lime glass. was shown compatible SnO2-based conducting oxide high resistance coated using in-line processes. Copyright © 2015 John Wiley & Sons, Ltd