Stability of Cu(In x Ga 1− x )Se 2 Solar Cells Utilizing RbF Postdeposition Treatment under a Sulfur Atmosphere
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- Department of Metallurgical and Materials Engineering Colorado School of Mines 1500 Illinois St Golden CO 80401 USA
- Materials, Chemical, and Computational Sciences Department National Renewable Energy Laboratory 15013 Denver West Pkwy Golden CO 80401 USA
- Nantes Université CNRS Institut des Matériaux de Nantes Jean Rouxel IMN F-44000 Nantes France
Alkali halide postdeposition treatments (PDTs) have become a key tool to maximize efficiency in Cu(In x Ga 1− 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.
- Research Organization:
- Colorado School of Mines, Golden, CO (United States); Nantes Universite (France); National Renewable Energy Laboratory (NREL), Golden, CO (United States)
- Sponsoring Organization:
- National Science Foundation (NSF); USDOE; USDOE Office of Energy Efficiency and Renewable Energy (EERE), Renewable Power Office. Solar Energy Technologies Office
- Grant/Contract Number:
- AC36-08GO28308; EE0008755
- OSTI ID:
- 1986390
- Report Number(s):
- NREL/JA--5900-85944; 2300052
- Journal Information:
- Advanced Energy and Sustainability Research, Journal Name: Advanced Energy and Sustainability Research Journal Issue: 11 Vol. 4; ISSN 2699-9412
- Publisher:
- Wiley Blackwell (John Wiley & Sons)Copyright Statement
- Country of Publication:
- Germany
- Language:
- English
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