Self-assembled InAs quantum dot molecules are grown on GaAs substrates without following any special protocols by using metal-organic chemical vapor deposition.The effects of indium composition and the thickness of th...Self-assembled InAs quantum dot molecules are grown on GaAs substrates without following any special protocols by using metal-organic chemical vapor deposition.The effects of indium composition and the thickness of the InGaAs cap layer on the optical properties of InAs quantum dot molecules are investigated by photoluminescence.With increasing indium composition and thickness of the InGaAs cap layer,the ground-state wavelength of the emission spectrum redshifts and the peak intensity decreases.In addition,the structural and optical properties of quantum dots and quantum dot molecules are comparatively studied,and the results show that when quantum dots turn into quantum dot molecules,the emission wavelength red shifts.展开更多
基金by the National High-Technology Research and Development Program of China(No 2007AA03Z414)the National Natural Science Foundation of China under Grant Nos 60777019 and 61077058.
文摘Self-assembled InAs quantum dot molecules are grown on GaAs substrates without following any special protocols by using metal-organic chemical vapor deposition.The effects of indium composition and the thickness of the InGaAs cap layer on the optical properties of InAs quantum dot molecules are investigated by photoluminescence.With increasing indium composition and thickness of the InGaAs cap layer,the ground-state wavelength of the emission spectrum redshifts and the peak intensity decreases.In addition,the structural and optical properties of quantum dots and quantum dot molecules are comparatively studied,and the results show that when quantum dots turn into quantum dot molecules,the emission wavelength red shifts.
