Tin–Lead Alloying for Efficient and Stable All-Inorganic Perovskite Solar Cells

Yang, Zuobao; Zhang, Xiaohong; Yang, Weiyou; Eperon, Giles E.; Ginger, David S.

doi:10.1021/acs.chemmater.9b04265

Tin–Lead Alloying for Efficient and Stable All-Inorganic Perovskite Solar Cells

Journal Article · Sun Mar 15 00:00:00 EDT 2020 · Chemistry of Materials

DOI:https://doi.org/10.1021/acs.chemmater.9b04265· OSTI ID:1604969

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Ningbo Univ. of Technology (China); University of Washington Department of Chemistry
Ningbo Univ. of Technology (China)
Cavendish Lab., Cambridge (United Kingdom); Univ.of Washington, Seattle, WA (United States); National Renewable Energy Lab. (NREL), Golden, CO (United States)
Univ. of Washington, Seattle, WA (United States)

Cesium containing all-inorganic perovskites have received considerable interest in photovoltaics research because of their potential for improved stability compared to their organic-inorganic hybrid counterparts. However, the inorganic perovskites studied thus far still suffer from lower power conversion efficiency and long-term instability, due to an unfavorable bandgap and either phase instability or air-sensitivity. Herein, A strategy to mitigate these concerns is investigated by alloying tin and lead on the B site to form tin-lead alloyed low-bandgap (~1.34 eV) inorganic CsSn_0.3Pb_0.7I₃ perovskites. Solar cells made using this material in an inverted full-structured architecture with a PEDOT:PSS hole transport materials (HTM) attain power conversion efficiency (PCE) up to 9.41% (stabilized PCE 7.23%). Furthermore, a simple HTM-free device without PEDOT:PSS layer is demonstrated more stable than the full-structured device and exhibits a PCE of 7.60% (stabilized PCE 7.31%) – the highest efficiency to date for an inorganic perovskite with a bandgap below 1.40 eV. This simplified device structure shows good reproducibility and stability. Finally, this work provides a possible route for fabricating low-cost, high stability devices with competitive efficiencies.

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Research Organization:: Univ. of Washington, Seattle, WA (United States). Dept. of Chemistry

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22); Zhejiang Provincial Nature Science Foundation of China; Natural Science Foundation of Ningbo Municipal Government of China; Foundation of Department of Education of Zhejiang Province; National Natural Science Foundation of China (NNSFC); National Science Foundation (NSF); National Institutes of Health (NIH)

Grant/Contract Number:: SC0013957

OSTI ID:: 1604969

Journal Information:: Chemistry of Materials, Journal Name: Chemistry of Materials Journal Issue: 7 Vol. 32; ISSN 0897-4756

Publisher:: American Chemical Society (ACS)Copyright Statement

Country of Publication:: United States

Language:: English

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Tin–Lead Alloying for Efficient and Stable All-Inorganic Perovskite Solar Cells

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