1. Concurrent cationic and anionic perovskite defect passivation enables 27.4% perovskite/silicon tandems with suppression of halide segregation
- Author
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Frédéric Laquai, Iain McCulloch, Thomas D. Anthopoulos, Emre Yengel, Mingcong Wang, Shynggys Zhumagali, Furkan Halis Isikgor, Esma Ugur, Mathan Kumar Eswaran, Atteq ur Rehman, George T. Harrison, Stefaan De Wolf, Nicola Gasparini, Thomas Allen, Michele De Bastiani, Emmanuel Van Kerschaver, Calvyn Travis Howells, Udo Schwingenschlögl, Erkan Aydin, Francesco Furlan, Derya Baran, Jiang Liu, and Anand S. Subbiah
- Subjects
Materials science ,Passivation ,Silicon ,Tandem ,business.industry ,Wide-bandgap semiconductor ,chemistry.chemical_element ,Halide ,02 engineering and technology ,010402 general chemistry ,021001 nanoscience & nanotechnology ,01 natural sciences ,0104 chemical sciences ,General Energy ,chemistry ,Chemical engineering ,Photovoltaics ,Grain boundary ,0210 nano-technology ,business ,Perovskite (structure) - Abstract
Summary 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.
- Published
- 2021