Journal article
Role of fluoride and fluorocarbons in enhanced stability and performance of halide perovskites for photovoltaics
Physical review materials, v 4(12)
28 Dec 2020
Featured in Collection : UN Sustainable Development Goals @ Drexel
Abstract
Halide perovskites are promising absorber materials for photovoltaics due to their high efficiency and lowtemperature solution processing, though the instabilities inherent to these systems remain a primary obstacle to their utilization. In this research update, we review the chemical, structural, and functional effects of fluoride and fluorinated organic additives in halide perovskites, especially on stability and photovoltaic performance. We detail the evidence that, when incorporated as its anion, fluoride is typically localized to perovskite surfaces and grain boundaries. Due to its high electronegativity, fluoride and fluorinated species can impart strong ionic and intermolecular bonding with perovskite materials, passivating surfaces and diminishing their susceptibility to further chemical reactivity. Additionally, fluorocarbon-based additives impart hydrophobicity to perovskite films and serve as physiochemical barriers to reactive infiltrating species. To understand how these effects operate in different contexts, herein we summarize the dual role surface defects play in both diminishing photovoltaic efficiency and introducing structural instabilities in various ABX(3) perovskite halide materials: hybrid organic/inorganic lead halide, all-inorganic cesium lead halide, and tin halide perovskites. We review three avenues of fluorine inclusion in perovskites: fluoride substitution at the anion site, partial incorporation of fluorinated organic cations at the A site, and large- and small-molecule fluorocarbon-based additives. We conclude with a perspective on the prospects for fluorine-based enhancement of halide perovskites and suggestions for new analytical and synthetic chemistries that will deepen our understanding and control of these systems.
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Details
- Title
- Role of fluoride and fluorocarbons in enhanced stability and performance of halide perovskites for photovoltaics
- Creators
- Benjamin M. Lefler - Drexel UniversitySteven J. May - Drexel UniversityAaron T. Fafarman - Drexel University
- Publication Details
- Physical review materials, v 4(12)
- Publisher
- Amer Physical Soc
- Number of pages
- 24
- Grant note
- CMMI-1562223 / National Science Foundation; National Science Foundation (NSF)
- Resource Type
- Journal article
- Language
- English
- Academic Unit
- Materials Science and Engineering; Chemical and Biological Engineering
- Web of Science ID
- WOS:000603568500001
- Scopus ID
- 2-s2.0-85099125412
- Other Identifier
- 991019167685404721
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Data related to this publication, from InCites Benchmarking & Analytics tool:
- Web of Science research areas
- Materials Science, Multidisciplinary