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Applied Science and Convergence Technology 2006; 15(3): 308-313

Published online May 1, 2006

Copyright © The Korean Vacuum Society.

Optical Properties of Self assembled InAs Quantum Dots with Bimodal Size Distribution

S. I. Jung , H. Y. Yeo , I. Yun , I. K. Han , J. I. Lee


We report a photoluminescence (PL) study on the growth process of self-assembled InAs quantum dots (QDs) under the various growth conditions. Distinctive double-peak feature was observed in the PL spectra of the QD samples grown at the relatively high substrate temperature. From the excitation power-dependent PL and the temperature dependent PL measurements, the double-peak feature is associated with the ground state transitions from InAs QDs with two different size branches. In addition, the variation in the bimodal size distribution of the QD ensembles with different InAs coverage is demonstrated.

Keywords: 양자점,InAs,이중크기분포,Photoluminescence,Quantum dot,Bimodal size distribution,Photoluminescence

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