Influence of the temperature on the carrier capture into self-assembled InAs/GaAs quantum dots

Author(s)

Duarte, C. A. ; Silva, E. C. F. da ; Quivy, A. A. ; Silva, M. J. da ; Martini, S. ; Leite, J. R. ; Meneses, E. A. ; Laureto, E.

• Document type: Journal article
• Source: Journal of Applied Physics; v. 93, n. 10, p. 6279-6283, May 2003.
• Field of knowledge: Physical Sciences and Mathematics - Physics

Abstract

Photoluminescence (PL) spectroscopy and atomic-force microscopy (AFM) were used to investigate the size evolution of InAs quantum dots on GaAs(001) as a function of the amount of InAs material. Different families of islands were observed in the AFM images and unambiguously identified in the PL spectra, together with the signal of the wetting layer. PL measurements carried out at low and intermediate temperatures showed a thermal carrier redistribution among dots belonging to different families. The physical origin of this behavior is explained in terms of the different temperature dependence of the carrier-capture rate into the quantum dots. At high temperatures, an enhancement of the total PL-integrated intensity of the largest-sized quantum dots was attributed to the increase of diffusivity of the photogenerated carriers inside the wetting layer. (AU)

• FAPESP's process: 98/12779-0 - Experimental and theoretical study of the epitaxial semiconductor nanostructures derived from III-V compounds
• Grantee: Gennady Gusev
• Support Opportunities: Research Projects - Thematic Grants