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The Strathprints institutional repository is a digital archive of University of Strathclyde research outputs.

Strathprints serves world leading Open Access research by the University of Strathclyde, including research by the Strathclyde Institute of Pharmacy and Biomedical Sciences (SIPBS), where research centres such as the Industrial Biotechnology Innovation Centre (IBioIC), the Cancer Research UK Formulation Unit, SeaBioTech and the Centre for Biophotonics are based.

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Optical and electrical properties of stacked binary InAs-GaAs quantum dot structures prepared under surfactant-mediated growth conditions

Alduraibi, M. and Missous, M. and Luke Sam, P. and Tierno, Alessio and Keatings, Stefanie Renaud and Ackemann, Thorsten (2010) Optical and electrical properties of stacked binary InAs-GaAs quantum dot structures prepared under surfactant-mediated growth conditions. Journal of Physics Conference Series, 245 (1). ISSN 1742-6588

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Abstract

The structural, optical and electrical properties of a 10-layer InAs/GaAs quantum dots (QDs) system having InAs layers (2.9ML) grown under surfactant growth conditions, using only an impinging In beam, were investigated. This growth mode still resulted in the formation of quantum dots, but with dot sizes smaller and sample quality better than those for normal growth (NG) of ~3ML InAs-GaAs QD structures. Room temperature photoluminescence measurements showed PL emission from this sample at 1200-1300 nm, i.e. reaching the telecom O-band. At low substrate growth temperatures (LT), 250oC, and under the same “Arsenic free” growth condition an InAs/GaAs superlattice structure without the formation of QD was successfully grown with up to 2.9MLs of InAs, which was not achievable under NG conditions. Both samples showed a noticeable photocurrent when illuminated with 1.2 - 1.3 µm lasers. Thus they can be used as photoconductive materials that can be excited at the telecom wavelengths of 1.3 µm for Terahertz or other optoelectronic applications.