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

Furkan Halis Isikgor, Francesco Furlan, Jiang Liu, Esma Ugur, Mathan Kumar Eswaran, Anand Selvin Subbiah, Emre Yengel, Michele de Bastiani, George T. Harrison, Shynggys Zhumagali, Calvyn Travis Howells, Erkan Aydin, Mingcong Wang, Nicola Gasparini, Thomas 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

8 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. PhenHClpassivated 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 85C 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 languageEnglish (US)
Pages (from-to)1566-1586
Number of pages21
JournalJoule
Volume5
Issue number6
DOIs
StatePublished - Jun 16 2021

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