Imaging the Spatial Evolution of Degradation in Perovskite/Si Tandem Solar Cells After Exposure to Humid Air

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

Research output: Contribution to journalArticlepeer-review

9 Scopus citations

Abstract

Monolithically integrated two-terminal perovskite/Si tandem solar cells promise to achieve high power conversion efficiency. However, there is a concern that the stability of the perovskite top cell will limit the long-term performance of tandem devices. To investigate the impact of perovskite cell degradation on the photocurrent generation and collection in the individual subcells, we employed light beam induced current mapping to spatially resolve the photocurrent under controlled humidity conditions. The evolution of the device behavior is consistent with the formation of an optically transparent hydrated perovskite phase that allows the bottom Si cell to continue to generate photocurrent at the probing wavelength (532 nm). Additional measurements were performed on perovskite thin films on glass substrates to verify the interpretation.
Original languageEnglish (US)
Pages (from-to)1563-1568
Number of pages6
JournalIEEE Journal of Photovoltaics
Volume7
Issue number6
DOIs
StatePublished - Sep 14 2017

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