Journal
SCIENCE
Volume 370, Issue 6522, Pages 1300-+Publisher
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.abd4016
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Funding
- Federal Ministry for Education and Research (BMBF) [03SF0540]
- Federal Ministry for Economic Affairs and Energy (BMWi) [0324288C]
- HyPerCells graduate school
- Helmholtz Association within the HySPRINT Innovation lab project
- Helmholtz Association within TAPAS project
- Helmholtz Association via HI-SCORE (Helmholtz International Research School)
- European Union [763977]
- Research Council of Lithuania of the SAM project [S-MIP-19-5/SV3-1079]
- Slovene Research Agency (ARRS) [P2-0197, J2-1727]
- Deutsche Forschungsgemeinschaft [423749265, 03EE1017C-SPP 2196]
- EPSRC [EP/L01551X/1]
- Erasmus+
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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.
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