Carlos Escorihuela-Sayalero, Ares Sanuy, Luis Carlos Pardo, Claudio Cazorla
{"title":"Orientational Disorder and Molecular Correlations in Hybrid Organic–Inorganic Perovskites: From Fundamental Insights to Technological Applications","authors":"Carlos Escorihuela-Sayalero, Ares Sanuy, Luis Carlos Pardo, Claudio Cazorla","doi":"10.1021/acsami.4c12762","DOIUrl":null,"url":null,"abstract":"Hybrid organic–inorganic perovskites (HOIP) have emerged in recent years as highly promising semiconducting materials for a wide range of optoelectronic and energy applications. Nevertheless, the rotational dynamics of the organic components and many-molecule interdependencies, which may strongly impact the functional properties of HOIP, are not yet fully understood. In this study, we quantitatively analyze the orientational disorder and molecular correlations in archetypal perovskite CH<sub>3</sub>NH<sub>3</sub>PbI<sub>3</sub> (MAPI) by performing comprehensive molecular dynamics simulations and entropy calculations. We found that, in addition to the usual vibrational and orientational contributions, rigid molecular rotations around the C–N axis and correlations between neighboring molecules noticeably contribute to the entropy increment associated with the temperature-induced order–disorder phase transition, Δ<i>S</i><sub><i>t</i></sub>. Molecular conformational changes are equally infrequent in the low-<i>T</i> ordered and high-<i>T</i> disordered phases and have a null effect on Δ<i>S</i><sub><i>t</i></sub>. Conversely, the couplings between the angular and vibrational degrees of freedom are substantially reinforced in the high-<i>T</i> disordered phase and significantly counteract the phase-transition entropy increase resulting from other factors. Furthermore, the tendency for neighboring molecules to be orientationally ordered is markedly local, consequently inhibiting the formation of extensive polar nanodomains at both low and high temperatures. This theoretical investigation not only advances the fundamental knowledge of HOIP but also establishes physically insightful connections with contemporary technological applications like photovoltaics, solid-state cooling, and energy storage.","PeriodicalId":5,"journal":{"name":"ACS Applied Materials & Interfaces","volume":"108 1","pages":""},"PeriodicalIF":8.3000,"publicationDate":"2024-12-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"ACS Applied Materials & Interfaces","FirstCategoryId":"88","ListUrlMain":"https://doi.org/10.1021/acsami.4c12762","RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"MATERIALS SCIENCE, MULTIDISCIPLINARY","Score":null,"Total":0}
引用次数: 0
Abstract
Hybrid organic–inorganic perovskites (HOIP) have emerged in recent years as highly promising semiconducting materials for a wide range of optoelectronic and energy applications. Nevertheless, the rotational dynamics of the organic components and many-molecule interdependencies, which may strongly impact the functional properties of HOIP, are not yet fully understood. In this study, we quantitatively analyze the orientational disorder and molecular correlations in archetypal perovskite CH3NH3PbI3 (MAPI) by performing comprehensive molecular dynamics simulations and entropy calculations. We found that, in addition to the usual vibrational and orientational contributions, rigid molecular rotations around the C–N axis and correlations between neighboring molecules noticeably contribute to the entropy increment associated with the temperature-induced order–disorder phase transition, ΔSt. Molecular conformational changes are equally infrequent in the low-T ordered and high-T disordered phases and have a null effect on ΔSt. Conversely, the couplings between the angular and vibrational degrees of freedom are substantially reinforced in the high-T disordered phase and significantly counteract the phase-transition entropy increase resulting from other factors. Furthermore, the tendency for neighboring molecules to be orientationally ordered is markedly local, consequently inhibiting the formation of extensive polar nanodomains at both low and high temperatures. This theoretical investigation not only advances the fundamental knowledge of HOIP but also establishes physically insightful connections with contemporary technological applications like photovoltaics, solid-state cooling, and energy storage.
期刊介绍:
ACS Applied Materials & Interfaces is a leading interdisciplinary journal that brings together chemists, engineers, physicists, and biologists to explore the development and utilization of newly-discovered materials and interfacial processes for specific applications. Our journal has experienced remarkable growth since its establishment in 2009, both in terms of the number of articles published and the impact of the research showcased. We are proud to foster a truly global community, with the majority of published articles originating from outside the United States, reflecting the rapid growth of applied research worldwide.