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Dielectrically Confined Excitons and Polaritons in Natural Superlattices -Perovskite Lead Iodide Semiconductors

Published online by Cambridge University Press:  16 February 2011

N. A. Gippius ,
E. A. Muljarov ,
S. G. Tikhodeev ,
T. Ishihara  and
L. V. KELDYSH
N. A. Gippius
Affiliation:
General Physics Institute, 38, Vavilova str., Moscow, 117333, Russia
E. A. Muljarov
Affiliation:
General Physics Institute, 38, Vavilova str., Moscow, 117333, Russia
S. G. Tikhodeev
Affiliation:
General Physics Institute, 38, Vavilova str., Moscow, 117333, Russia
T. Ishihara
Affiliation:
Dept. of Physics, Faculty of Sci., Tohoku University, Sendai 980, Japan
L. V. KELDYSH
Affiliation:
P.N. Lebedev, Physical Institute, Moscow, Russia
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Abstract

A large class of new layered semiconductors — lead iodide compounds — is of great interest because of possible optoelectronic applications due to pronounced excitonic effects. These compounds may be regarded as naturally grown semiconductor/insulator superlat-tices, with perovskite lead iodide (semiconductor) layers sandwiched by alkylammonium (insulator) layers. Exciton binding energies and oscillator strength in these structures are enhanced due to the so-called “dielectric confinement” caused by large difference between dielectric constants of adjoining layers. The binding energies, wave functions,& diamagnetic coefficient of excitons in these naturally grown superlattices are calculated with allowance for the image potential and the superlattice structure of the compounds. The localization of excitons in lead iodide layers causes also a strong dependence of a polariton spike in reflection spectra on the polarization of electromagnetic wave. The results obtained are in agreement with the experimental data.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 328: Symposium Q – Electrical, Optical, and Magnetic Properties of Organic Solid State Materials , 1993 , 775
Copyright
Copyright © Materials Research Society 1994

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References

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