Optical properties of size quantized PbSe films chemically deposited on GaAs

M. Shandalov; J. P. Makai; J. Balazs; Z. S.J. Horvath; N. Gutman; A. Sa'ar; Y. Golan

doi:10.1051/epjap:2007172

Optical properties of size quantized PbSe films chemically deposited on GaAs

M. Shandalov^*, J. P. Makai, J. Balazs, Z. S.J. Horvath, N. Gutman, A. Sa'ar, Y. Golan

^*Corresponding author for this work

Racah Institute of Physics

Research output: Contribution to journal › Article › peer-review

15 Scopus citations

Abstract

PbSe films were chemically deposited with a range of controlled microstructures, from nanocrystalline to monocrystalline films. The crystal size in the nanocrystalline films was controlled in a range 7 to 25 nm with a fairly narrow size distribution, which allowed fine-tuning of the PbSe energy gap. The optical properties of the films were investigated using infrared (IR) transmission and IR photoluminescence measurements. The nanocrystalline PbSe films showed single bandgap values in the technologically important near-IR region. Two bandgap values, corresponding to both bulk and confined nanocrystals, were obtained for films with mixed microstructure. Strong blue shifts in both the absorption and emission peaks of the nanocrystalline layers were obtained. The bandgaps of the PbSe films were found to be in good agreement with theoretical calculations. The results point out the potential of these films for nanoscale optical device applications operating in the near-IR range.

Original language	English
Pages (from-to)	75-80
Number of pages	6
Journal	EPJ Applied Physics
Volume	41
Issue number	1
DOIs	https://doi.org/10.1051/epjap:2007172
State	Published - Jan 2008

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AU - Shandalov, M.

AU - Makai, J. P.

AU - Balazs, J.

AU - Horvath, Z. S.J.

AU - Gutman, N.

AU - Sa'ar, A.

AU - Golan, Y.

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AB - PbSe films were chemically deposited with a range of controlled microstructures, from nanocrystalline to monocrystalline films. The crystal size in the nanocrystalline films was controlled in a range 7 to 25 nm with a fairly narrow size distribution, which allowed fine-tuning of the PbSe energy gap. The optical properties of the films were investigated using infrared (IR) transmission and IR photoluminescence measurements. The nanocrystalline PbSe films showed single bandgap values in the technologically important near-IR region. Two bandgap values, corresponding to both bulk and confined nanocrystals, were obtained for films with mixed microstructure. Strong blue shifts in both the absorption and emission peaks of the nanocrystalline layers were obtained. The bandgaps of the PbSe films were found to be in good agreement with theoretical calculations. The results point out the potential of these films for nanoscale optical device applications operating in the near-IR range.

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Optical properties of size quantized PbSe films chemically deposited on GaAs

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