Complementary bulk and surface passivations for highly efficient perovskite solar cells by gas quenching

Shi Tang, Jueming Bing, Jianghui Zheng, Jianbo Tang, Yong Li, Mohannad Mayyas, Yongyoon Cho, Timothy W. Jones, Terry Chien Jen Yang, Lin Yuan, Mike Tebyetekerwa, Hieu T. Nguyen, Michael P. Nielsen, N. J. Ekins-Daukes, Kourosh Kalantar-Zadeh, Gregory J. Wilson, David R. McKenzie, Shujuan Huang, Anita W.Y. Ho-Baillie*

*Corresponding author for this work

    Research output: Contribution to journalArticlepeer-review

    23 Citations (Scopus)

    Abstract

    The power conversion efficiency (PCE) of metal halide perovskite solar cells (PSCs) has improved dramatically from 3.8% to 25.5% in only a decade. Gas quenching is a desirable method for fabricating high-efficiency cells as it does not consume antisolvents and is compatible with large-area deposition methods such as doctor blading and slot-die coating. To further improve PCEs for gas-quenched PSCs, here, we develop complementary bulk and surface passivation strategies by incorporating potassium iodide (KI) in the perovskite precursor and applying n-hexylammonium bromide (HABr) to the perovskite surface. We show that (1) KI induces a spatial-compositional change, improving grain boundary properties; (2) KI and HABr reduce traps, especially at levels close to the mid-gap; and (3) HABr greatly improves the built-in potential of the device, thereby improving voltage output. The champion device achieves a steady-state PCE of 23.6% with a VOC of 1.23V, which is, to the best of our knowledge, the highest for PSC by gas quenching to date.

    Original languageEnglish
    Article number100511
    JournalCell Reports Physical Science
    Volume2
    Issue number8
    DOIs
    Publication statusPublished - 18 Aug 2021

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