TY - JOUR
T1 - Optical properties due to electronic transitions in two-dimensional semiconductors (CnH2n+1NH3)2PbI4
AU - Ishihara, Teruya
AU - Takahashi, Jun
AU - Goto, Takenari
N1 - Copyright:
Copyright 2015 Elsevier B.V., All rights reserved.
PY - 1990
Y1 - 1990
N2 - Optical spectra in the visible and uv regions are investigated in layer-type perovskite compounds (CnH2n+1NH3)PbI4 with n=4, 6, 8, 9, 10, and 12. The spacing between the PbI4 layers changes from 15.17 for n=4 to 24.51 for n=12. In spite of these different spacings, the optical spectra are almost the same for these compounds, which means that the interaction between the layers is weak. The lowest exciton is located at 2.56 eV at 1.6 K, and its oscillator strength and binding energy are 0.7 per formula unit and 320 meV, respectively. These values are very large compared with those in a three-dimensional analog PbI2. The large oscillator strength and binding energy can be explained by the small dielectric constant of the alkylammonium "barrier layer, which strengthens the Coulomb interaction between an electron and a hole.
AB - Optical spectra in the visible and uv regions are investigated in layer-type perovskite compounds (CnH2n+1NH3)PbI4 with n=4, 6, 8, 9, 10, and 12. The spacing between the PbI4 layers changes from 15.17 for n=4 to 24.51 for n=12. In spite of these different spacings, the optical spectra are almost the same for these compounds, which means that the interaction between the layers is weak. The lowest exciton is located at 2.56 eV at 1.6 K, and its oscillator strength and binding energy are 0.7 per formula unit and 320 meV, respectively. These values are very large compared with those in a three-dimensional analog PbI2. The large oscillator strength and binding energy can be explained by the small dielectric constant of the alkylammonium "barrier layer, which strengthens the Coulomb interaction between an electron and a hole.
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U2 - 10.1103/PhysRevB.42.11099
DO - 10.1103/PhysRevB.42.11099
M3 - Article
AN - SCOPUS:0000319439
VL - 42
SP - 11099
EP - 11107
JO - Physical Review B
JF - Physical Review B
SN - 0163-1829
IS - 17
ER -