OBSERVATION OF A 2-DIMENSIONAL ELECTRON-GAS IN MODULATION-DOPED ZNTE CDSE QUANTUM-WELLS/

Citation
Ip. Smorchkova et N. Samarth, OBSERVATION OF A 2-DIMENSIONAL ELECTRON-GAS IN MODULATION-DOPED ZNTE CDSE QUANTUM-WELLS/, Applied physics letters, 72(24), 1998, pp. 3193-3195
Citations number
16
Categorie Soggetti
Physics, Applied
Journal title
ISSN journal
00036951
Volume
72
Issue
24
Year of publication
1998
Pages
3193 - 3195
Database
ISI
SICI code
0003-6951(1998)72:24<3193:OOA2EI>2.0.ZU;2-Q
Abstract
We demonstrate the formation of a two-dimensional electron gas in latt ice-matched, modulation-doped ZnTe/CdSe quantum well structures. Despi te the well-known difficulty in n doping the II-VI semiconductor ZnTe, we find that the unusual type-II band alignment between ZnTe and CdSe allows the efficient transfer of free carriers from n-ZnTe into a CdS e quantum well since the deep donor levels in the n-ZnTe barrier lie a bove the confined ground state in the CdSe well. The sizeable well dep th (similar to 1.35 eV) enables the fabrication of two-dimensional ele ctron gases with sheet concentrations up to similar to 6x10(12) cm(-2) , and with a low-temperature mobility up to 1.4 x 10(4) cm(2)/V s. (C) 1998 American Institute of Physics.