# Monolithic perovskite/silicon tandem solar cell with >29% efficiency by enhanced hole extraction

“Monolithic perovskite/silicon tandem solar cell with >29% efficiency by enhanced hole extraction” (2020), by Amran Al‐Ashouri et al. Engineering research paper. Original abstract below, unchanged. No free PDF was found.

- Authors: Amran Al‐Ashouri, Eike Köhnen, Bor Li, Artiom Magomedov, Hannes Hempel, Pietro Caprioglio, Jose Antonio Marquez, Anna Belen Morales‐Vilches, Ernestas Kasparavičius, Joel A. Smith et al.
- Published: December 10, 2020
- Field: Engineering
- DOI: https://doi.org/10.1126/science.abd4016
- Source: https://vb.ktu.edu/KTU:ELABAPDB77663302&prefLang=en_US

## 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.

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