Stability of Cu(In x Ga 1− x )Se 2 Solar Cells Utilizing RbF Postdeposition Treatment under a Sulfur Atmosphere
Abstract
Alkali halide postdeposition treatments (PDTs) have become a key tool to maximize efficiency in Cu(InxGa1-x)Se-2 (CIGS) photovoltaics. RbF PDTs have emerged as an alternative to the more common Na- and K-based techniques. This study utilizes temperature-dependent current-voltage (JVT) measurements to study a unique RbF PDT performed in a S atmosphere. The samples are measured before and after 6 months in a desiccator to study device stability. Both samples contain Na and K which diffuse from the soda-lime glass substrate. A reference sample and a RbF + S PDT sample both show the development of a rear contact barrier after aging. The contact barrier is higher for the RbF + S PDT sample, leading to decreased current in forward bias. Series resistance is also higher in the RbF + S PDT device which leads to lower fill factor. However, after aging the reference sample has a larger decrease in open-circuit voltage (V-OC). Ideality factor measurements suggest Shockley-Read-Hall recombination dominates both samples. V-OC versus temperature and a temperature-dependent activation energy model are used to calculate diode activation energies for each sample condition. Both techniques produce similar values that indicate recombination primarily occurs within the bulk absorber.
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Adv Energy and Sustain Res - 2023 - Wands - Stability of Cu InxGa1 x Se2 Solar Cells Utilizing RbF Postdeposition Treatment.pdf (839.54 Ko)
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