Details

Autor(en) / Beteiligte

• Shakfa, Mohammad Khaled
• Chernikov, Alexey
• Kalincev, Dimitri
• Chatterjee, Sangam
• Lu, Xianfeng
• Johnson, Shane R.
• Beaton, Dan A.
• Tiedje, Thomas
• Koch, Martin

Titel

Carrier relaxation dynamics in a Ga(AsBi) single quantum well under high-intensity excitation conditions

Ist Teil von

• Physica status solidi. C, 2013-09, Vol.10 (9), p.1234-1237

Ort / Verlag

Berlin: WILEY-VCH Verlag

Erscheinungsjahr

2013

Link zum Volltext

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• The carrier dynamics of a Ga(AsBi)/GaAs single quantum well (SQW) with a Bi content of 5.5% are studied by means of time‐resolved photoluminescence (PL). Random fluctuation of the alloy compositions and the presence of Bi clusters in the QW material, lead to localized states and have a significant influence on the mechanism of the PL emission. Under low excitation conditions, the PL emission is dominated by the recombination of localized electron‐hole pairs. The PL spectra exhibit a considerable blue‐shift with increased excitation intensity due to the filling of localized states. At high excitation intensities, additional PL signatures at the high energy side of the main emission peak evolve, corresponding to higher confined states of the quantum well. Also, the role of the carrier hopping between localized states becomes smaller. In addition, a shortening of the PL decay time is observed at increased lattice temperatures due to the delocalization of carriers, leading to faster non‐radiative recombination. The latter is accompanied by the quenching of the PL intensity. (© 2013 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)