Probing Photocurrent Nonuniformities in the Subcells of Monolithic Perovskite/Silicon Tandem Solar Cells
De Wolf, Stefaan
Watthage, Suneth C.
Phillips, Adam B.
Ellingson, Randy J.
Heben, Michael J.
KAUST DepartmentPhysical Sciences and Engineering (PSE) Division
Materials Science and Engineering Program
KAUST Solar Center (KSC)
King Abdullah University of Science and Technology (KAUST), KAUST Solar Center (KSC), Thuwal 23955-6900, Saudi Arabia
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AbstractPerovskite/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.
CitationSong Z, Werner J, Shrestha N, Sahli F, De Wolf S, et al. (2016) Probing Photocurrent Nonuniformities in the Subcells of Monolithic Perovskite/Silicon Tandem Solar Cells. The Journal of Physical Chemistry Letters 7: 5114–5120. Available: http://dx.doi.org/10.1021/acs.jpclett.6b02415.
SponsorsThis work is financially supported by the Wright Center Endowment for Photovoltaics Innovation and Commercialization, U.S. Air Force Research Laboratory, Space Vehicles Directorate (Contract No. FA9453-11-C-0253), U.S. National Science Foundation (Contract No. CHE-1230246), Swiss National Science Foundation, Nano-Tera.ch, and Swiss Federal Office of Energy, under Grant SI/501072-01.
PublisherAmerican Chemical Society (ACS)