Monolithic perovskite/silicon tandem solar cell with >29% efficiency by enhanced hole extraction
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- 11 December 2020
- journal article
- research article
- Published by American Association for the Advancement of Science (AAAS) in Science
- Vol. 370 (6522), 1300-1309
- https://doi.org/10.1126/science.abd4016
Abstract
Tandem solar cells that pair silicon with a metal halide perovskite are a promising option for surpassing the single-cell efficiency limit. We report a monolithic perovskite/silicon tandem with a certified power conversion efficiency of 29.15%. The perovskite absorber, with a bandgap of 1.68 electron volts, remained phase-stable under illumination through a combination of fast hole extraction and minimized nonradiative recombination at the hole-selective interface. These features were made possible by a self-assembled, methyl-substituted carbazole monolayer as the hole-selective layer in the perovskite cell. The accelerated hole extraction was linked to a low ideality factor of 1.26 and single-junction fill factors of up to 84%, while enabling a tandem open-circuit voltage of as high as 1.92 volts. In air, without encapsulation, a tandem retained 95% of its initial efficiency after 300 hours of operation.Funding Information
- H2020 European Research Council (763977)
- Deutsche Forschungsgemeinschaft (423749265)
- Deutsche Forschungsgemeinschaft (03EE1017C - SPP 2196)
- Bundesministerium für Bildung und Forschung (03SF0540)
- Javna Agencija za Raziskovalno Dejavnost RS (P2-0197)
- Javna Agencija za Raziskovalno Dejavnost RS (J2-1727)
- Lietuvos Mokslo Taryba (S‐MIP‐19‐5/SV3‐1079)
- Bundesministerium für Wirtschaft und Energie (0324288C)
- Helmholtz Association
- EPSRC Centre for Doctoral Training in New and Sustainable Photovoltaics (CDT-PV (EP/L01551X/1))
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