期刊
ACS ENERGY LETTERS
卷 3, 期 8, 页码 1787-1794出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsenergylett.8b00672
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资金
- UK Government
- Engineering and Physical Sciences Research Council (EPSRC) UK [EP/M005143/1, EP/M015254/2]
- Marie Sklodowska-Curie action [706552-APPEL]
- Leverhulme Trust [RL-2012-001]
- Graphene Flagship (Horizon2020 Grant) [696656Graphene Core 1]
- PRACE AISBL
- UK EPSRC [EP/P020259/1]
- PRACE
- EPSRC [EP/M015254/1, EP/M024881/1, EP/J009857/1, EP/M005143/1, EP/M015254/2, EP/M020517/1, EP/R023581/1] Funding Source: UKRI
- Engineering and Physical Sciences Research Council [EP/M024881/1, EP/M015254/1] Funding Source: researchfish
Room-temperature films of black-phase cesium lead iodide (CsPbI3) are widely thought to be trapped in a cubic perovskite polymorph. Here, we challenge this assumption. We present structural refinement of room-temperature black-phase CsPbI3 in an orthorhombic polymorph. We demonstrate that this polymorph is adopted by both powders and thin films of black-phase CsPbI3, fabricated either by high-or low-temperature processes. We perform electronic band structure calculations for the orthorhombic polymorph and find agreement with experimental data and close similarities with orthorhombic methylammonium lead iodide. We investigate the structural transitions and thermodynamic stability of the various polymorphs of CsPbI3 and show that the orthorhombic polymorph is the most stable among its other perovskite polymorphs, but it remains less stable than the yellow nonperovskite polymorph.
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