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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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Selective modification of band gap in GaInNAs/GaAs structures by quantum-well intermixing

Macaluso, R. and Sun, H.D. and Dawson, M.D. and Robert, F. and Bryce, A.C. and Marsh, J.H. and Riechert, H. (2003) Selective modification of band gap in GaInNAs/GaAs structures by quantum-well intermixing. Applied Physics Letters, 82 (24). pp. 4259-4261. ISSN 0003-6951

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Abstract

We report an investigation of selective quantum-well intermixing (QWI) in 1.3-µm GaInNAs/GaAs multi quantum wells by silica-cap-induced disordering processes. After thermal annealing under specific conditions, controlled shifts of band gap at room temperature of over 200 nm have been observed in sputtered SiO2-capped samples, while uncapped and SiO2-capped samples by plasma-enhanced chemical vapor deposition demonstrated negligible shift. This selective modification of the band gap in GaInNAs quantum wells has been confirmed by detailed photoluminescence and photoluminescence excitation spectroscopy, and by secondary ion mass spectrometry. The controlled tuning of the band gap of GaInNAs/GaAs by QWI is important for a wide range of photonic integrated circuits and advanced device applications.