Triple-junction solar cells with cyanate in ultrawide-bandgap perovskites

Shunchang Liu, Yue Lu, Cao Yu, Jia Li, Ran Luo, Renjun Guo, Haoming Liang, Xiangkun Jia, Xiao Guo, Yu-Duan Wang, Qilin Zhou, Xi Wang, Shaofei Yang, Manling Sui, Peter Müller-Buschbaum and Yi Hou ()
Additional contact information
Shunchang Liu: National University of Singapore
Yue Lu: Beijing University of Technology
Cao Yu: Suzhou Maxwell Technologies
Jia Li: National University of Singapore
Ran Luo: National University of Singapore
Renjun Guo: National University of Singapore
Haoming Liang: National University of Singapore
Xiangkun Jia: National University of Singapore
Xiao Guo: National University of Singapore
Yu-Duan Wang: National University of Singapore
Qilin Zhou: National University of Singapore
Xi Wang: National University of Singapore
Shaofei Yang: Suzhou Maxwell Technologies
Manling Sui: Beijing University of Technology
Peter Müller-Buschbaum: Technical University of Munich
Yi Hou: National University of Singapore

Nature, 2024, vol. 628, issue 8007, 306-312

Abstract: Abstract Perovskite bandgap tuning without quality loss makes perovskites unique among solar absorbers, offering promising avenues for tandem solar cells1,2. However, minimizing the voltage loss when their bandgap is increased to above 1.90 eV for triple-junction tandem use is challenging3–5. Here we present a previously unknown pseudohalide, cyanate (OCN−), with a comparable effective ionic radius (1.97 Å) to bromide (1.95 Å) as a bromide substitute. Electron microscopy and X-ray scattering confirm OCN incorporation into the perovskite lattice. This contributes to notable lattice distortion, ranging from 90.5° to 96.6°, a uniform iodide–bromide distribution and consistent microstrain. Owing to these effects, OCN-based perovskite exhibits enhanced defect formation energy and substantially decreased non-radiative recombination. We achieved an inverted perovskite (1.93 eV) single-junction device with an open-circuit voltage (VOC) of 1.422 V, a VOC × FF (fill factor) product exceeding 80% of the Shockley–Queisser limit and stable performance under maximum power point tracking, culminating in a 27.62% efficiency (27.10% certified efficiency) perovskite–perovskite–silicon triple-junction solar cell with 1 cm2 aperture area.

Date: 2024
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DOI: 10.1038/s41586-024-07226-1

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