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Optical properties of InAs/In0.15Ga0.85As quantum dots-in-a-well studied by piezomodulated reflectance spectroscopy

โœ Scribed by C. Wang; Y. Yang; X.M. Chen; C.S. Xia; Z.L. Liu; H.Y. Cui; W. Lu

Publisher
Elsevier Science
Year
2008
Tongue
English
Weight
756 KB
Volume
40
Category
Article
ISSN
1386-9477

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โœฆ Synopsis

Piezomodulated reflectance (PzR) spectroscopy has been used to study the InAs/In 0.15 Ga 0.85 As quantum dots-in-a-well (DWELL) samples in the temperature range of 70-300 K. The optical transitions from ground state to excited states in InAs DWELL were observed. The heavy-and light-hole transitions from the hybrid quantum well (HQW) were identified by combining the one-dimensional effective mass approximation (EMA) with the selected modulation effect in PzR spectrum. A remarkable red shift of the ground state has been observed in the InAs DWELL with optimized growth of In 0.15 Ga 0.85 As quantum well layers. Cooling both DWELL samples produces an abnormal broadening of the QD transitions in PzR spectra.

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