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

Hiroyuki Kanda, Naoyuki Shibayama, Aron Joel Huckaba, Yonghui Lee, Sanghyun Paek, Nadja Klipfel, Cristina Roldán-Carmona, Valentin Ianis Emmanuel Queloz, Giulia Grancini, Yi Zhang, Mousa Abuhelaiqa, Kyung Taek Cho, Mo Li, Mounir Driss Mensi, Sachin Kinge, Mohammad Khaja Nazeeruddin

Research output: Contribution to journalArticlepeer-review

117 Scopus citations

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.

Original languageEnglish
Pages (from-to)1222-1230
Number of pages9
JournalEnergy and Environmental Science
Volume13
Issue number4
DOIs
StatePublished - Apr 2020

Bibliographical note

Publisher Copyright:
© The Royal Society of Chemistry.

ASJC Scopus subject areas

  • Environmental Chemistry
  • Renewable Energy, Sustainability and the Environment
  • Nuclear Energy and Engineering
  • Pollution

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