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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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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., 2020, Advance Article

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    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, Advance Article , DOI: 10.1039/C9EE02028D

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