Monolithic all-perovskite tandem solar cells with 24.8% efficiency exploiting comproportionation to suppress Sn(ii) oxidation in precursor ink

Renxing Lin; Ke Xiao; Zhengyuan Qin; Qiaolei Han; Chunfeng Zhang; Mingyang Wei; Makhsud I. Saidaminov; Yuan Gao; Jun Xu; Min Xiao; Aidong Li; Jia Zhu; Edward H. Sargent; Hairen Tan

doi:10.1038/s41560-019-0466-3

Monolithic all-perovskite tandem solar cells with 24.8% efficiency exploiting comproportionation to suppress Sn(ii) oxidation in precursor ink

Renxing Lin, Ke Xiao, Zhengyuan Qin, Qiaolei Han, Chunfeng Zhang, Mingyang Wei, Makhsud I. Saidaminov, Yuan Gao, Jun Xu, Min Xiao, Aidong Li, Jia Zhu^*, Edward H. Sargent, Hairen Tan

^*Corresponding author for this work

Chemistry

Research output: Contribution to journal › Article › peer-review

906 Scopus citations

Abstract

Combining wide-bandgap and narrow-bandgap perovskites to construct monolithic all-perovskite tandem solar cells offers avenues for continued increases in photovoltaic (PV) power conversion efficiencies (PCEs). However, actual efficiencies today are diminished by the subpar performance of narrow-bandgap subcells. Here we report a strategy to reduce Sn vacancies in mixed Pb–Sn narrow-bandgap perovskites that use metallic tin to reduce the Sn⁴⁺ (an oxidation product of Sn²⁺) to Sn²⁺ via a comproportionation reaction. We increase, thereby, the charge-carrier diffusion length in narrow-bandgap perovskites to 3 μm for the best materials. We obtain a PCE of 21.1% for 1.22-eV narrow-bandgap solar cells. We fabricate monolithic all-perovskite tandem cells with certified PCEs of 24.8% for small-area devices (0.049 cm²) and of 22.1% for large-area devices (1.05 cm²). The tandem cells retain 90% of their performance following 463 h of operation at the maximum power point under full 1-sun illumination.

Original language	English (US)
Pages (from-to)	864-873
Number of pages	10
Journal	Nature Energy
Volume	4
Issue number	10
DOIs	https://doi.org/10.1038/s41560-019-0466-3
State	Published - Oct 1 2019

Funding

This work is supported by the National Key R&D Programme of China (grant no. 2018YFB1500102), the Thousand Talent Programme for Young Outstanding Scientists in China and the Fundamental Research Funds for the Central Universities (grant no. 0213/14380122). The work of C.Z. is supported by the National Key R&D Programme of China (grant no. 2017YFA0303703) and the National Natural Science Foundation of China (grant no. 91833305). The work of J.Z. is supported by the National Natural Science Foundation of China (grant no. 11574143). The authors thank Q. Shi at SIMIT (Shanghai) for his guidance on the J–V measurements of tandem solar cells.

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Renewable Energy, Sustainability and the Environment
Fuel Technology
Energy Engineering and Power Technology

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

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10.1038/s41560-019-0466-3

Cite this

Lin, R., Xiao, K., Qin, Z., Han, Q., Zhang, C., Wei, M., Saidaminov, M. I., Gao, Y., Xu, J., Xiao, M., Li, A., Zhu, J., Sargent, E. H., & Tan, H. (2019). Monolithic all-perovskite tandem solar cells with 24.8% efficiency exploiting comproportionation to suppress Sn(ii) oxidation in precursor ink. Nature Energy, 4(10), 864-873. https://doi.org/10.1038/s41560-019-0466-3

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Monolithic all-perovskite tandem solar cells with 24.8% efficiency exploiting comproportionation to suppress Sn(ii) oxidation in precursor ink

Abstract

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UN SDGs

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