Interband and intraband optical transitions in mercury chalcogenide colloidal quantum dots

Research output: Chapters, Conference Papers, Creative and Literary Works (RGC: 12, 32, 41, 45)32_Refereed conference paper (with ISBN/ISSN)peer-review

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Detail(s)

Original languageEnglish
Title of host publication2017 IEEE 17th International Conference on Nanotechnology (IEEE-NANO)
PublisherInstitute of Electrical and Electronics Engineers Inc.
Pages641-644
ISBN (Electronic)9781509030286
ISBN (Print)9781509030293
Publication statusPublished - Jul 2017

Publication series

NameProceedings of the IEEE Conference on Nanotechnology
Volume2017
ISSN (Electronic)1944-9380

Conference

Title17th IEEE International Conference on Nanotechnology (IEEE NANO 2017)
LocationPittsburgh Marriott City Center
PlaceUnited States
CityPittsburgh
Period25 - 28 July 2017

Abstract

We study the optical transitions in mercury chalcogenide colloidal quantum dots (CQDs) by using Fourier transform infrared spectrometer. The optical absorption measurements revealed distinct optical transition processes in mercury telluride (HgTe) CQDs and mercury selenium (HgSe) CQDs. The results show that the spectral absorbance of HgTe CQDs is broadband, which is originated from the interband optical transition between valence band to conduction band, while that of HgSe CQDs is narrowband. And we speculate that the narrowband absorption is resulted from the intraband transition in HgSe CQDs. Furthermore, both the interband energy gaps of HgTe CQDs and intraband energy gaps of HgSe CQDs have been estimated based on the spectral absorbance. The extracted energy gaps are in good agreement with the calculated values by two-band Kroning-Penny model.

Citation Format(s)

Interband and intraband optical transitions in mercury chalcogenide colloidal quantum dots. / Tang, Xin; Wu, Guangfu; Lai, King Wai Chiu.

2017 IEEE 17th International Conference on Nanotechnology (IEEE-NANO). Institute of Electrical and Electronics Engineers Inc., 2017. p. 641-644 8117308 (Proceedings of the IEEE Conference on Nanotechnology; Vol. 2017).

Research output: Chapters, Conference Papers, Creative and Literary Works (RGC: 12, 32, 41, 45)32_Refereed conference paper (with ISBN/ISSN)peer-review