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Optical spectra of microcrystals of the layered semiconductor PbI grown in glass matrices

Semiconductors, ISSN: 1063-7826, Vol: 32, Issue: 2, Page: 136-139
1998
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The transmittance, luminescence, and Raman spectra in PbI microcrystals of 2H polytype, grown in the voids of alkali-borosilicate glasses (void dimensions 4-30 nm), are investigated. Depending on the conditions of growth, the exciton states of the microcrystalline systems were found to shift toward higher energies by 35-60 meV relative to the free exciton energy in bulk single crystals as a result of the quantum-well effect. The resonant Raman spectra of PbI microcrystals exhibit not only the conventional Raman component A, but also components associated with the appearance of the E and A optical phonons and the two-phonon processes. © 1998 American Institute of Physics.

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