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Issue 4, 2020
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Band-bending induced passivation: high performance and stable perovskite solar cells using a perhydropoly(silazane) precursor

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Abstract

Surface passivation of the perovskite photo absorber is a key factor to improve the photovoltaic performance. So far robust passivation strategies have not yet been revealed. Here, we demonstrate a successful passivation strategy which controls the Fermi-level of the perovskite surface by improving the surface states. Such Fermi-level control caused band-bending between the surface and bulk of the perovskite, which enhanced the hole-extraction from the absorber bulk to the HTM side. As an added benefit, the inorganic passivation layer improved the device light stability. By depositing a thick protection layer on the complete device, a remarkable waterproofing effect was obtained. As a result, an enhancement of VOC and the conversion efficiency from 20.5% to 22.1% was achieved. We revealed these passivation mechanisms and used perhydropoly(silazane) (PHPS) derived silica to control the perovskite surface states.

Graphical abstract: Band-bending induced passivation: high performance and stable perovskite solar cells using a perhydropoly(silazane) precursor

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Article information


Submitted
27 Jun 2019
Accepted
05 Nov 2019
First published
06 Nov 2019

Energy Environ. Sci., 2020,13, 1222-1230
Article type
Paper

Band-bending induced passivation: high performance and stable perovskite solar cells using a perhydropoly(silazane) precursor

H. Kanda, N. Shibayama, A. J. Huckaba, Y. Lee, S. Paek, N. Klipfel, C. Roldán-Carmona, V. I. E. Queloz, G. Grancini, Y. Zhang, M. Abuhelaiqa, K. T. Cho, M. Li, M. D. Mensi, S. Kinge and M. K. Nazeeruddin, Energy Environ. Sci., 2020, 13, 1222
DOI: 10.1039/C9EE02028D

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