Choi, YC Kim, TG Park, YM Park, YJ 2024-01-21T06:43:20Z 2024-01-21T06:43:20Z 2021-09-02 2004-07 0374-4884 https://pubs.kist.re.kr/handle/201004/137454 The optical properties of In0.5Ga0.5As-GaAs single-layer quantum dots (SL-QDs) and three vertically stacked double-layer quantum dots (DL-QDs) with different spacer thicknesses, grown by solid-source molecular beam epitaxy (MBE) in Stranski-Krastonow (S-K) growth mode, are investigated by micro-photoluminescence (mu-PL) spectroscopy. Interestingly, mu-PL spectra of all DL-QDs are observed at energies lower by approximately 40 meV, compared with those of SL-QDs, indicating the effective coupling of DL-QDs, along with multiple sub-peaks on the right shoulder of the luminescence center. A reduction in overall energies of the quantum dot (QD) in terms of electronic coupling, and the creation of multiple energy states in terms of mutual interactions among the DL-QDs of different sizes and shapes, are considered to be possible reasons for this phenomenon. The excitation-power-dependent mu-PL spectra also show state-filling effects in the lowest energy levels of the DL-QDs. English KOREAN PHYSICAL SOC OPTICAL-PROPERTIES COMPUTATION RESONANCE SURFACES ISLANDS STATES GROWTH A micro-photoluminescence study of vertically stacked InGaAs-GaAs double-layer quantum dots Article 1 JOURNAL OF THE KOREAN PHYSICAL SOCIETY, v.45, no.1, pp.134 - 137 JOURNAL OF THE KOREAN PHYSICAL SOCIETY 45 1 134 137 scie scopus kci 000222795800030 2-s2.0-3843075117 Physics, Multidisciplinary Physics Article; Proceedings Paper OPTICAL-PROPERTIES COMPUTATION RESONANCE SURFACES ISLANDS STATES GROWTH quantum dot micro-photoluminescence molecular beam epitaxy