Concurrent cationic and anionic perovskite defect passivation enables 27.4% perovskite/silicon tandems with suppression of halide segregation

Furkan H. Isikgor, Francesco Furlan, Jiang Liu, Esma Ugur, Mathan K. Eswaran, Anand S. Subbiah, Emre Yengel, Michele De Bastiani, George T. Harrison, Shynggys Zhumagali, Calvyn T. Howells, Erkan Aydin, Mingcong Wang, Nicola Gasparini, Thomas G. Allen, Atteq ur Rehman, Emmanuel Van Kerschaver, Derya Baran, Iain McCulloch, Thomas D. AnthopoulosUdo Schwingenschlögl, Frédéric Laquai, Stefaan De Wolf

    Research output: Contribution to journalArticlepeer-review

    112 Scopus citations

    Abstract

    Stable and efficient perovskite/silicon tandem solar cells require defect passivation and suppression of light-induced phase segregation of the wide-band-gap perovskite. Here, we report how molecules containing both electron-rich and electron-poor moieties, such as phenformin hydrochloride (PhenHCl), can satisfy both requirements, independent of the perovskite's surface chemical composition and its grain boundaries and interfaces. PhenHCl-passivated wide-band-gap (∼1.68 eV) perovskite p-i-n single-junction solar cells deliver an open-circuit voltage (VOC) ∼100 mV higher than control devices, resulting in power conversion efficiencies (PCEs) up to 20.5%. These devices do not show any VOC losses after more than 3,000 h of thermal stress at 85°C in a nitrogen ambient. Moreover, PhenHCl passivation improves the PCE of textured perovskite/silicon tandem solar cells from 25.4% to 27.4%. Our findings provide critical insights for improved passivation of metal halide perovskite surfaces and the fabrication of highly efficient and stable perovskite-based single-junction and tandem solar cells.

    Original languageBritish English
    Pages (from-to)1566-1586
    Number of pages21
    JournalJoule
    Volume5
    Issue number6
    DOIs
    StatePublished - 16 Jun 2021

    Keywords

    • defects
    • passivation
    • perovskite
    • phase segregation
    • photovoltaics
    • silicon
    • solar cells
    • tandems
    • wide band-gap

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