The perovskite phase of cesium lead iodide (α-CsPbI3 or "black" phase), possesses favorable optoelectronic properties for photovoltaic applications. However, the stable phase at room temperature is a non-functional, "yellow" phase (δ-CsPbI3). Herein, black phase polycrystalline thin films are synthesized above 330°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°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.
This research output has an Altmetric Attention Score of 1. This is our high-level measure of the quality and quantity of online attention that it has received. This Attention Score, as well as the ranking and number of research outputs shown below, was calculated when the research output was last mentioned on 07 March 2017.
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#98
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