Strain analysis of black-to-yellow phase transitions in CsPbI3

Strain analysis of black-to-yellow phase transitions in CsPbI3 | Research Square window.SnipcartSettings = { analytics: { enabled: false } }; (function() { var accessVector = localStorage.getItem('access_vector') || ''; window.dataLayer = window.dataLayer || []; if (accessVector) { window.dataLayer.push({ user: { profile: { profileInfo: { snid: accessVector } } } }); } })(); (function(w,d,s,l,i){w[l]=w[l]||[];w[l].push({'gtm.start':new Date().getTime(),event:'gtm.js'});var f=d.getElementsByTagName(s)[0],j=d.createElement(s),dl=l!='dataLayer'?'&l='+l:'';j.async=true;j.src='https://www.googletagmanager.com/gtm.js?id='+i+dl;f.parentNode.insertBefore(j,f);})(window,document,'script','dataLayer','GTM-K279D39R'); Browse Preprints In Review Journals COVID-19 Preprints AJE Video Bytes Research Tools Research Promotion AJE Professional Editing AJE Rubriq About Preprint Platform In Review Editorial Policies Our Team Advisory Board Help Center Sign In Submit a Preprint Cite Share Download PDF Article Strain analysis of black-to-yellow phase transitions in CsPbI 3 Dexin Yang, Bangwei Jin, Ruihao Gong, Dongchen Lan, Xuefeng Zhang This is a preprint; it has not been peer reviewed by a journal. https://doi.org/ 10.21203/rs.3.rs-5947683/v1 This work is licensed under a CC BY 4.0 License Status: Posted Version 1 posted You are reading this latest preprint version Abstract All-inorganic halide perovskite cesium lead iodide (CsPbI 3 ) has emerged as a promising semiconductor and optoelectronic material. However, its optically active black phases easily transform into the non-optically active yellow phase, limiting practical applications. Here, strain variations during phase transitions in CsPbI 3 are investigated using a strain/order parameter coupling model, based on lattice parameters measured over the temperature range of 100–650 K. Structural and thermal analyses suggest that the large positive ( e ₁- e ₂) strain is the primary driver responsible for the transformation of black CsPbI₃ into the yellow phase. The impact of this strain on the phase stability of CsPbI₃-based films is further validated by comparing films on different substrates and with varying compositions. Our findings uncover the key metric that determines the phase stability of CsPbI 3 , providing insights for the design of stable, optically active all-inorganic halide perovskite. Physical sciences/Physics/Condensed-matter physics/Phase transitions and critical phenomena Physical sciences/Materials science/Materials for energy and catalysis Full Text Additional Declarations There is NO Competing Interest. Supplementary Files SupplementaryInformationCsPbI3.docx Supplementary Information for: Strain analysis of black-to-yellow phase transitions in CsPbI3 Cite Share Download PDF Status: Posted Version 1 posted You are reading this latest preprint version Research Square lets you share your work early, gain feedback from the community, and start making changes to your manuscript prior to peer review in a journal. As a division of Research Square Company, we’re committed to making research communication faster, fairer, and more useful. We do this by developing innovative software and high quality services for the global research community. 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Also discoverable on Platform About Our Team In Review Editorial Policies Advisory Board Help Center Resources Author Services Accessibility API Access RSS feed Manage Cookie Preferences © Research Square 2026 | ISSN 2693-5015 (online) Privacy Policy Terms of Service Do Not Sell My Personal Information {"props":{"pageProps":{"initialData":{"identity":"rs-5947683","acceptedTermsAndConditions":true,"allowDirectSubmit":true,"archivedVersions":[],"articleType":"Article","associatedPublications":[],"authors":[{"id":422400213,"identity":"17a9d71c-bb68-40da-8cec-54bbbbb03c83","order_by":0,"name":"Dexin 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However, its optically active black phases easily transform into the non-optically active yellow phase, limiting practical applications. Here, strain variations during phase transitions in CsPbI\u003csub\u003e3\u003c/sub\u003e are investigated using a strain/order parameter coupling model, based on lattice parameters measured over the temperature range of 100\u0026ndash;650 K. Structural and thermal analyses suggest that the large positive (\u003cem\u003ee\u003c/em\u003e₁-\u003cem\u003ee\u003c/em\u003e₂) strain is the primary driver responsible for the transformation of black CsPbI₃ into the yellow phase. The impact of this strain on the phase stability of CsPbI₃-based films is further validated by comparing films on different substrates and with varying compositions. 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