Photoluminescence study of InAs/InGaAs sub-monolayer quantum dot infrared photodetectors with various numbers of multiple stack layers
Journal of Luminescence(2019)
摘要
This study investigated the effects of the number of stacking layers (S) on the optical properties of InAs/InGaAs sub-monolayer quantum dot (SML-QD) infrared photodetectors by photoluminescence spectroscopy. As S was increased from two to six, the room temperature PL emission energies were redshifted remarkably (~84 meV) and the full width at half maximum was increased by approximately 10 meV due to a change in the size distribution of SML-QDs. Furthermore, the excitation intensity-dependent PL spectra of the SML-QD (S = 6) showed improved PL integrated intensity caused by a change in the QD distribution and density. With increasing S, the carrier thermal activation energies (Ea) for the InAs QD and InGaAs quantum well (QW) increased by approximately 27 and 8 meV, respectively, due to the QD size effect. These results suggest that the mini-band structure of multiple SML-QDs formed with a very thin spacer thickness (~1 nm) could be tuned by controlling S.
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