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

Abstract

Surface passivation of the perovskite photo absorber is a key factor to improve 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 surface states. Such Fermi-level control caused a 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, the remarkable waterproofing effect was obtained. As a result, an enhancement of VOC and 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 state.

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Publication details

The article was received on 27 Jun 2019, accepted on 05 Nov 2019 and first published on 06 Nov 2019


Article type: Paper
DOI: 10.1039/C9EE02028D
Energy Environ. Sci., 2019, Accepted Manuscript

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

    H. Kanda, N. Shibayama, A. Huckaba, Y. Lee, S. paek, N. Klipfel, C. Roldán Carmona, V. I.E. Queloz, G. Grancini, Y. Zhang, M. Abuhelaiqa, K. Cho, M. Li, M. Mensi, S. Kinge and M. K. Nazeeruddin, Energy Environ. Sci., 2019, Accepted Manuscript , DOI: 10.1039/C9EE02028D

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