期刊
INORGANIC CHEMISTRY
卷 56, 期 1, 页码 84-91出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.inorgchem.6b02318
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资金
- FP7 European Union (Marie Curie Initial Training Network) [DESTINY/316494]
- Greek government
- European Regional Development Fund of the European Union under the National Strategic Reference Framework NSRF
- Regional Operational Program of Attica (Project: Advanced Materials and Devices for Energy Harvesting and Management within KRIPIS action)
- Regional Operational Program of Attica (Project: Thales-Investing in knowledge society through the European Social Fund/NANO-MESO-MIS within Operational Program Education and Lifelong Learning) [377064]
- Greek General Secretariat for Research and Technology
- European Commission, through the European Social Fund for Regional Development [NSRF 20072013, 447963]
The CsSnI3 perovskite and the corresponding SnF2-containing material with nominal composition CsSnI2.95F0.05 were synthesized by solid-state reactions and structurally characterized by powder X-ray diffraction. Both materials undergo rapid phase transformation upon exposure to air from the black orthorhombic phase (B-gamma-CsSnI3) to the yellow orthorhombic phase (Y-CsSnI3), followed by irreversible oxidation into Cs2SnI6 within several hours. The phase transition occurs at a significantly lower rate in the SnF2-containing material rather than in the pure perovskite. The high hole-carrier concentration of the materials prohibits the detection of Raman signals for B-gamma-CsSnI3 and induces a very strong plasmonic reflectance in the far-IR. In contrast, far-IR phonon bands and a rich Raman spectrum are observed for the Y-CsSnI3 modification below 140 cm(-1) with weak frequency shift gradients versus temperatures between -95 and +170 degrees C. Above 170 degrees C, the signal is lost due to B-alpha-CsSnI3 re-formation. The photoluminescence spectra exhibit residual blue transformation initiation.
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