Probing Photocurrent Nonuniformities in the Subcells of Monolithic Perovskite/Silicon Tandem Solar Cells

Zhaoning Song, Jeremie Werner, Niraj Shrestha, Florent Sahli, Stefaan De Wolf, Bjorn Niesen, Suneth C. Watthage, Adam B. Phillips, Christophe Ballif, Randy J. Ellingson, Michael J. Heben

Research output: Contribution to journalArticlepeer-review

18 Scopus citations

Abstract

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.
Original languageEnglish (US)
Pages (from-to)5114-5120
Number of pages7
JournalThe Journal of Physical Chemistry Letters
Volume7
Issue number24
DOIs
StatePublished - Dec 2016
Externally publishedYes

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