Characteristics of InGaAs quantum dots grown on tensile-strained GaAs P
Journal of Applied Physics, ISSN: 0021-8979, Vol: 97, Issue: 9
2005
- 30Citations
- 22Captures
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Article Description
InGaAs quantum dots (QDs) embedded in tensile-strained GaAs1-x Px (x=0.0-0.45) barrier layers are grown using low-pressure metal-organic chemical-vapor deposition. Variable-temperature photoluminescence (PL) measurement demonstrates that the lowest-energy QD transition can be blueshifted up to 90 nm compared with similar structures utilizing GaAs barriers. Temperature-dependent PL measurements and atomic force microscopy surface imaging show that the InGaAs QDs grown on GaAsP exhibit reduced height, which is consistent with shorter-wavelength emission. Preliminary results from broad stripe (100 μm wide) diode lasers utilizing two stacks of InGaAs QDs embedded in GaAs0.82 P0.18 barriers exhibit a 30% reduction in threshold current density compared with similar laser structures which have GaAs barriers. © 2005 American Institute of Physics.
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