Journal article
Quantitative Phase-Change Thermodynamics and Metastability of Perovskite-Phase Cesium Lead Iodide
The journal of physical chemistry letters, v 8(6), pp 1278-1282
16 Mar 2017
PMID: 28256139
Featured in Collection : UN Sustainable Development Goals @ Drexel
Abstract
The perovskite phase of cesium lead iodide (alpha-CsPbI3 or "black" phase) possesses favorable optoelectronic properties for photovoltaic applications. However, the stable phase at room temperature is a nonfunctional "yellow" phase (delta-CsPbI3). Black-phase polycrystalline thin films are synthesized above 330 degrees C and rapidly quenched to room temperature, retaining their phase in a metastable state. Using differential scanning calorimetry, it is shown herein that the metastable state is maintained in the absence of moisture, up to a temperature of 100 degrees C, and a reversible phase-change enthalpy of 14.2 (+/- 0.5) kJ/mol is observed. The presence of atmospheric moisture hastens the black-to-yellow conversion kinetics without significantly changing the enthalpy of the transition, indicating a catalytic effect, rather than a change in equilibrium due to water adduct formation. These results delineate the conditions for trapping the desired phase and highlight the significant magnitude of the entropic stabilization of this phase.
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Details
- Title
- Quantitative Phase-Change Thermodynamics and Metastability of Perovskite-Phase Cesium Lead Iodide
- Creators
- Subham Dastidar - Drexel UniversityChristopher J. Hawley - Drexel UniversityAndrew D. Dillon - Drexel UniversityAlejandro D. Gutierrez-Perez - Drexel UniversityJonathan E. Spanier - Drexel UniversityAaron T. Fafarman - Drexel University
- Publication Details
- The journal of physical chemistry letters, v 8(6), pp 1278-1282
- Publisher
- American Chemical Society; Washington, DC
- Number of pages
- 5
- Grant note
- 1604293 / Directorate For Engineering; National Science Foundation (NSF); NSF - Directorate for Engineering (ENG) N00014-14-1-0761 / ONR; Office of Naval Research
- Resource Type
- Journal article
- Language
- English
- Academic Unit
- Chemical and Biological Engineering; Mechanical Engineering and Mechanics
- Web of Science ID
- WOS:000396975600030
- Scopus ID
- 2-s2.0-85015156822
- Other Identifier
- 991019169517404721
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InCites Highlights
Data related to this publication, from InCites Benchmarking & Analytics tool:
- Web of Science research areas
- Chemistry, Physical
- Materials Science, Multidisciplinary
- Nanoscience & Nanotechnology
- Physics, Atomic, Molecular & Chemical