Resonant perovskite solar cells with extended band edge

Jiangang Feng, Xi Wang, Jia Li, Haoming Liang, Wen Wen, Ezra Alvianto, Cheng-Wei Qiu, Rui Su and Yi Hou ()
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Jiangang Feng: National University of Singapore
Xi Wang: National University of Singapore
Jia Li: National University of Singapore
Haoming Liang: National University of Singapore
Wen Wen: Nanyang Technological University
Ezra Alvianto: National University of Singapore
Cheng-Wei Qiu: National University of Singapore
Rui Su: Nanyang Technological University
Yi Hou: National University of Singapore

Nature Communications, 2023, vol. 14, issue 1, 1-8

Abstract: Abstract Tuning the composition of perovskites to approach the ideal bandgap raises the single-junction Shockley-Queisser efficiency limit of solar cells. The rapid development of narrow-bandgap formamidinium lead triiodide-based perovskites has brought perovskite single-junction solar cell efficiencies up to 26.1%. However, such compositional engineering route has reached the limit of the Goldschmidt tolerance factor. Here, we experimentally demonstrate a resonant perovskite solar cell that produces giant light absorption at the perovskite band edge with tiny absorption coefficients. We design multiple guide-mode resonances by momentum matching of waveguided modes and free-space light via Brillouin-zone folding, thus achieving an 18-nm band edge extension and 1.5 mA/cm2 improvement of the current. The external quantum efficiency spectrum reaches a plateau of above 93% across the spectral range of ~500 to 800 nm. This resonant nanophotonics strategy translates to a maximum EQE-integrated current of 26.0 mA/cm2 which is comparable to that of the champion single-crystal perovskite solar cell with a thickness of ~20 μm. Our findings break the ray-optics limit and open a new door to improve the efficiency of single-junction perovskite solar cells further when compositional engineering or other carrier managements are close to their limits.

Date: 2023
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DOI: 10.1038/s41467-023-41149-1

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