Efficient Hybrid Amorphous Silicon/Organic Tandem Solar Cells Enabled by Near-Infrared Absorbing Nonfullerene Acceptors

Abstract
Monolithically stacked tandem solar cells present opportunities to absorb more of the sun's radiation while reducing the degree of energetic loss through thermalization. In these applications, the bandgap of the tandem's constituent subcells must be carefully adjusted so as to avoid competition for photons. Organic photovoltaics based on nonfullerene acceptors (NFAs) have recently exploded in popularity owing to the ease with which their electrical and optical properties can be tuned through chemistry. Here, highly complementary and efficient 2-terminal tandem solar cells are reported based on a wide bandgap amorphous silicon absorber, and a narrow bandgap NFA bulk-heterojunction with power conversion efficiencies (PCEs) exceeding 15%. Interface engineering of this tandem device allows for high PCEs across a wide range of light intensities both above and below “1 sun.” Furthermore, the addition of an inorganic silicon subcell enhances the operational stability of the tandem by reducing the light-stress experienced by the bulk heterojunction, resolving a long-standing stumbling block in organic photovoltaic research.

Citation
Troughton, J., Neubert, S., Gasparini, N., Villalva, D. R., Bertrandie, J., Seitkhan, A., … Baran, D. (2021). Efficient Hybrid Amorphous Silicon/Organic Tandem Solar Cells Enabled by Near-Infrared Absorbing Nonfullerene Acceptors. Advanced Energy Materials, 2100166. doi:10.1002/aenm.202100166

Acknowledgements
J.T. would like to thank Dr. Xin Song for valuable discussions surround organic photovoltaic device fabrication. This publication is based upon work supported by the King Abdullah University of Science and Technology (KAUST) Office of Sponsored Research (OSR) under award numbers “KAUST OSR-CARF URF/1/3079-33-01,” “OSR-2018-CARF/CCF-3079,” and “OSR-2018-KAUST-KAU Initiative-3902.”

Publisher
Wiley

Journal
Advanced Energy Materials

DOI
10.1002/aenm.202100166

Additional Links
https://onlinelibrary.wiley.com/doi/10.1002/aenm.202100166

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