Role of nitrogen in the mobility drop of electrons in modulation-doped GaAsN/AlGaAs heterostructures |
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Authors: | Robert Mouillet Louis-Anne de VaulchierEmmanuelle Deleporte Yves GuldnerLaurent Travers Jean-Christophe Harmand |
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Institution: | a LPMC, Ecole Normale Supérieure, 24 rue Lhomond, 75231 Paris Cedex 05, France b Laboratoire de Photonique et Nanostructures (CNRS), Route de Nozay 91460 Marcoussis, France |
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Abstract: | We report transport properties of a 2 dimension electron gas (2DEG) in molecular beam epitaxy-grown GaAs1−xNx/AlGaAs modulation-doped heterostructures. Quantum oscillations in far infrared cyclotron resonance prove the efficient electron transfer and formation of the 2DEG. The 2DEG mobility strongly depends on the N concentration in the channel layer. It shows a drastic decrease as compared to N-free samples, even for the smallest amount of N (0.02%). For this N composition, the electron effective mass was found to be 0.073m0. Reduced growth temperature (450 °C) was found to improve the mobility of N-containing channels. Examination of transport properties from 4 to 300 K and cyclotron resonance experiments give evidence of the presence of ionised impurity-like scattering centres in GaAsN. |
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Keywords: | 73 40 73 61 E 76 40 |
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