Amran Al‐Ashouri; Eike Köhnen; Bor Li; Artiom Magomedov; Hannes Hempel; Pietro Caprioglio; J.A. Marquez; Anna Belen Morales‐Vilches; Ernestas Kasparavičius; Joel A. Smith; Nga Phung; Dorothee Menzel; Max Grischek; Lukas Kegelmann; Dieter Skroblin; Christian Gollwitzer; Tadas Malinauskas; Marko Jošt; Gašper Matič; B. Rech; Rutger Schlatmann; Marko Topič; Lars Korte; Antonio Abate; Bernd Stannowski; Dieter Neher; Martin Stolterfoht; Thomas Unold; Vytautas Getautis; Steve Albrecht · 2020 · Science
Paper
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.
Analysis
This paper presents a monolithic perovskite/silicon tandem solar cell achieving a certified power conversion efficiency of 29.15% through enhanced hole extraction and minimized recombination at the hole-selective interface.
Discovery
Constantin Bach; Dong Won Kim; Yitian Du; Yana Vaynzof; Carsten Deibel
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