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Open Access Nano Review

Magnetotransport study on as-grown and annealed n- and p-type modulation-doped GaInNAs/GaAs strained quantum well structures

Ömer Dönmez1, Fahrettin Sarcan1, Ayse Erol1*, Mustafa Gunes12, Mehmet Çetin Arikan1, Janne Puustinen3 and Mircea Guina3

Author Affiliations

1 Department of Physics, Faculty of Science, Istanbul University, Vezneciler, Istanbul 34134, Turkey

2 Material Engineering, Adana Science and Technology University, Seyhan, Adana 01180, Turkey

3 Optoelectronics Research Centre, Tampere University of Technology, Korkeakoulunkatu, Tampere 33720, Finland

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Nanoscale Research Letters 2014, 9:141  doi:10.1186/1556-276X-9-141

Published: 24 March 2014

Abstract

We report the observation of thermal annealing- and nitrogen-induced effects on electronic transport properties of as-grown and annealed n- and p-type modulation-doped Ga1 - xInxNyAs1 - y (x = 0.32, y = 0, 0.009, and 0.012) strained quantum well (QW) structures using magnetotransport measurements. Strong and well-resolved Shubnikov de Haas (SdH) oscillations are observed at magnetic fields as low as 3 T and persist to temperatures as high as 20 K, which are used to determine effective mass, 2D carrier density, and Fermi energy. The analysis of temperature dependence of SdH oscillations revealed that the electron mass enhances with increasing nitrogen content. Furthermore, even the current theory of dilute nitrides does not predict a change in hole effective mass; nitrogen dependency of hole effective mass is found and attributed to both strain- and confinement-induced effects on the valence band. Both electron and hole effective masses are changed after thermal annealing process. Although all samples were doped with the same density, the presence of nitrogen in n-type material gives rise to an enhancement in the 2D electron density compared to the 2D hole density as a result of enhanced effective mass due to the effect of nitrogen on conduction band. Our results reveal that effective mass and 2D carrier density can be tailored by nitrogen composition and thermal annealing-induced effects.

PACS

72.00.00; 72.15.Gd; 72.80.Ey

Keywords:
GaInNAs; Magnetotransport; Shubnikov de Haas; Transport; Nitrogen-dependent effective mass