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Highly efficient tin perovskite solar cells achieved in a wide oxygen concentration range

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Abstract

Tin perovskite solar cells (TPSCs) as one of the most promising candidates for lead-free PSCs have large potential to be industrialized in the future. However, TPSCs have often been fabricated at an extremely low oxygen concentration to avoid oxidation from Sn2+ to Sn4+, which is not applicable to their large scale production. In this work, we construct a carbonylate antioxidant capping layer atop the perovskite surface via a solvent engineering method to prevent oxygen permeation into the perovskite layer during the fabrication process of the device to enlarge the oxygen region from 0.1 ppm to 100 ppm. Meanwhile, a pinhole-free perovskite film with a large grain size, reduced Sn4+ defects and long carrier recombination lifetime was fabricated. As a result, high-performance TPSCs could be achieved in a wide range of oxygen concentration with a power conversion efficiency (PCE) of 9.47% at 0.1 ppm oxygen and 9.03% at 100 ppm oxygen, respectively; the device was stable, maintaining over 93% of its initial PCE after operating at the maximum power point under continuous light soaking (AM 1.5G, 100 mW cm−2) for 600 hours.

Graphical abstract: Highly efficient tin perovskite solar cells achieved in a wide oxygen concentration range

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Article information


Submitted
01 Dec 2019
Accepted
06 Jan 2020
First published
07 Jan 2020

J. Mater. Chem. A, 2020, Advance Article
Article type
Paper

Highly efficient tin perovskite solar cells achieved in a wide oxygen concentration range

X. He, T. Wu, X. Liu, Y. Wang, X. Meng, J. Wu, T. Noda, X. Yang, Y. Moritomo, H. Segawa and L. Han, J. Mater. Chem. A, 2020, Advance Article , DOI: 10.1039/C9TA13159K

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