Abstract We have investigated the temperature dependence of the photoluminescence (PL) spectrum of self-organized InAs/GaAs quantum dots. A distinctive double-peak feature of the PL spectra from quantum dots has been observed, and a bimodal distribution of dot sizes has also been confirmed by scanning tunneling microscopy image for uncapped sample. The power-dependent PL study demonstrates that the distinctive PL emission peaks are associated with the ground-state emission of islands in different size branches. The temperature-dependent PL study shows that the PL quenching temperature for different dot families is different. Due to lacking of the couple between quantum dots, an unusual temperature dependence of the linewidth and peak energy of the dot ensemble photoluminescence has not been observed. In addition, we have tuned the emission wavelength of InAs QDs to 1.3 μm at room temperature.
Received: 08 September 1999
Revised: 09 October 1999
Accepted manuscript online:
PACS:
68.35.B-
(Structure of clean surfaces (and surface reconstruction))
Fund: Project supported by the National Natural Science Foundation of China(Grant Nos. 69776016 and 19823001) and the State Key Program for Basic Research.
Cite this article:
Guo Zhong-sheng (郭忠圣), Wang Hai-long (王海龙), Ning Dong (宁东), Feng Song-lin (封松林) PHOTOLUMINESCENCE STUDY OF InAs/GaAs SELF-ORGANIZED QUANTUM DOTS WITH BIMODAL SIZE DISTRIBUTION 2000 Chinese Physics 9 384
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