Highly stable and efficient all-inorganic lead-free perovskite solar cells with native-oxide passivation

Min Chen, Ming-Gang Ju, Hector F. Garces, Alexander D. Carl, Luis K. Ono, Zafer Hawash, Yi Zhang, Tianyi Shen, Yabing Qi, Ronald L. Grimm, Domenico Pacifici, Xiao Cheng Zeng, Yuanyuan Zhou () and Nitin P. Padture ()
Additional contact information
Min Chen: Brown University
Ming-Gang Ju: University of Nebraska-Lincoln
Hector F. Garces: Brown University
Alexander D. Carl: Worcester Polytechnic Institute
Luis K. Ono: Okinawa Institute of Science and Technology Graduate University
Zafer Hawash: Okinawa Institute of Science and Technology Graduate University
Yi Zhang: Brown University
Tianyi Shen: Brown University
Yabing Qi: Okinawa Institute of Science and Technology Graduate University
Ronald L. Grimm: Worcester Polytechnic Institute
Domenico Pacifici: Brown University
Xiao Cheng Zeng: University of Nebraska-Lincoln
Yuanyuan Zhou: Brown University
Nitin P. Padture: Brown University

Nature Communications, 2019, vol. 10, issue 1, 1-8

Abstract: Abstract There has been an urgent need to eliminate toxic lead from the prevailing halide perovskite solar cells (PSCs), but the current lead-free PSCs are still plagued with the critical issues of low efficiency and poor stability. This is primarily due to their inadequate photovoltaic properties and chemical stability. Herein we demonstrate the use of the lead-free, all-inorganic cesium tin-germanium triiodide (CsSn0.5Ge0.5I3) solid-solution perovskite as the light absorber in PSCs, delivering promising efficiency of up to 7.11%. More importantly, these PSCs show very high stability, with less than 10% decay in efficiency after 500 h of continuous operation in N2 atmosphere under one-sun illumination. The key to this striking performance of these PSCs is the formation of a full-coverage, stable native-oxide layer, which fully encapsulates and passivates the perovskite surfaces. The native-oxide passivation approach reported here represents an alternate avenue for boosting the efficiency and stability of lead-free PSCs.

Date: 2019
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DOI: 10.1038/s41467-018-07951-y

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