Journal
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
Volume 7, Issue 24, Pages 5114-5120Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.jpclett.6b02415
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Funding
- U.S. Air Force Research Laboratory, Space Vehicles Directorate [FA9453-11-C-0253]
- U.S. National Science Foundation [CHE-1230246]
- Swiss National Science Foundation
- Swiss Federal Office of Energy [SI/501072-01]
- Wright Center Endowment for Photovoltaics Innovation and Commercialization
- Nano-Tera.ch
- Division Of Materials Research
- Direct For Mathematical & Physical Scien [1230246] Funding Source: National Science Foundation
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Perovskite/silicon tandem solar cells with high power conversion efficiencies have the potential to become a commercially viable photovoltaic option in the near future. However, device design and optimization is challenging because conventional characterization methods do not give clear feedback on the localized chemical and physical factors that limit performance within individual subcells, especially when stability and degradation is a concern. In this study, we use light beam induced current (LBIC) to probe photocurrent collection nonuniformities in the individual subcells of perovskite/silicon tandems. The choices of lasers and light biasing conditions allow efficiency-limiting effects relating to processing defects, optical interference within the individual cells, and the evolution of water-induced device degradation to be spatially resolved. The results reveal several types of microscopic defects and demonstrate that eliminating these and managing the optical properties within the multilayer structures will be important for future optimization of perovskite/silicon tandem solar cells.
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