期刊
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
卷 8, 期 6, 页码 1278-1282出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.jpclett.7b00134
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资金
- ONR [N00014-14-1-0761]
- [CBET-1604293]
- [CMMI-1463412]
- Div Of Chem, Bioeng, Env, & Transp Sys
- Directorate For Engineering [1604293] Funding Source: National Science Foundation
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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