Stark effects on band gap and surface phonons of semiconductor quantum dots in dielectric hosts

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The authors have investigated quantum-confined Stark effect (QCSE) on GaAs and CdSe nanocrystals and the electric field effect on surface phonons of GaAs nanocrystals isolated in sapphire substrates. For a strongly quantum-confined system, GaAs quantum dots illustrated no exciton energy shift. When the excitons are weakly confined in CdSe, a {approximately} 2 meV red-shift was observed. On the other hand, the results of the electric field effect on surface phonon are dramatic both phonon oscillator strength and frequency. As the strength of the electric field increases, the total intensity of the surface phonon decreases. At the same time, an additional ... continued below

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7 p.

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Mu, R.; Ueda, A.; Tung, Y.S.; Henderson, D.O.; Zhu, J.G.; Budai, J.D. et al. January 1, 1996.

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Description

The authors have investigated quantum-confined Stark effect (QCSE) on GaAs and CdSe nanocrystals and the electric field effect on surface phonons of GaAs nanocrystals isolated in sapphire substrates. For a strongly quantum-confined system, GaAs quantum dots illustrated no exciton energy shift. When the excitons are weakly confined in CdSe, a {approximately} 2 meV red-shift was observed. On the other hand, the results of the electric field effect on surface phonon are dramatic both phonon oscillator strength and frequency. As the strength of the electric field increases, the total intensity of the surface phonon decreases. At the same time, an additional peak was also observed at 277 cm{sup {minus}1}, which is about 3 cm{sup {minus}1} above the center frequency of the surface phonon mode of GaAs nanocrystals embedded in a sapphire host.

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7 p.

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OSTI as DE96008101

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  • Fall meeting of the Materials Research Society (MRS), Boston, MA (United States), 27 Nov - 1 Dec 1995

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  • Other: DE96008101
  • Report No.: CONF-951155--109
  • Grant Number: AC05-96OR22464;FG05-94ER45521
  • DOI: 10.2172/219349 | External Link
  • Office of Scientific & Technical Information Report Number: 219349
  • Archival Resource Key: ark:/67531/metadc671557

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  • January 1, 1996

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  • June 29, 2015, 9:42 p.m.

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  • May 2, 2016, 4:14 p.m.

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Mu, R.; Ueda, A.; Tung, Y.S.; Henderson, D.O.; Zhu, J.G.; Budai, J.D. et al. Stark effects on band gap and surface phonons of semiconductor quantum dots in dielectric hosts, report, January 1, 1996; Tennessee. (digital.library.unt.edu/ark:/67531/metadc671557/: accessed September 22, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.