TY - JOUR
T1 - Structural Stability, Vibrational Properties, and Photoluminescence in CsSnI3 Perovskite upon the Addition of SnF2
AU - Kontos, Athanassios G.
AU - Kaltzoglou, Andreas
AU - Siranidi, Eirini
AU - Palles, Dimitrios
AU - Angeli, Giasemi K.
AU - Arfanis, Michalis K.
AU - Psycharis, Vassilis
AU - Raptis, Yannis S.
AU - Kamitsos, Efstratios I.
AU - Trikalitis, Pantelis N.
AU - Stoumpos, Constantinos C.
AU - Kanatzidis, Mercouri G.
AU - Falaras, Polycarpos
N1 - Funding Information:
This work is financially supported by the FP7 European Union (Marie Curie Initial Training Network DESTINY/316494), the Greek government, the European Regional Development Fund of the European Union under the National Strategic Reference Framework NSRF 2007-2013, the Regional Operational Program of Attica (Projects: Advanced Materials and Devices for Energy Harvesting and Management within KRIPIS action and Thales-Investing in knowledge society through the European Social Fund/NANOMESO- MIS 377064 within the Operational Program Education and Lifelong Learning).
Publisher Copyright:
© 2016 American Chemical Society.
PY - 2017/1/3
Y1 - 2017/1/3
N2 - 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-γ-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-γ-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 °C. Above 170 °C, the signal is lost due to B-α-CsSnI3 re-formation. The photoluminescence spectra exhibit residual blue shifts and broadening as a sign of structural transformation initiation.
AB - 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-γ-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-γ-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 °C. Above 170 °C, the signal is lost due to B-α-CsSnI3 re-formation. The photoluminescence spectra exhibit residual blue shifts and broadening as a sign of structural transformation initiation.
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U2 - 10.1021/acs.inorgchem.6b02318
DO - 10.1021/acs.inorgchem.6b02318
M3 - Article
C2 - 28043139
AN - SCOPUS:85008957346
SN - 0020-1669
VL - 56
SP - 84
EP - 91
JO - Inorganic chemistry
JF - Inorganic chemistry
IS - 1
ER -