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MOVPE growth and characterisation of ZnTe epilayers on (1 0 0)ZnTe:P substrates

TitoloMOVPE growth and characterisation of ZnTe epilayers on (1 0 0)ZnTe:P substrates
Tipo di pubblicazioneArticolo su Rivista peer-reviewed
Anno di Pubblicazione2003
AutoriLovergine, N., Traversa M., Prete P., Yoshino K., Ozeki M., Pentimalli Marzia, Tapfer Leander, and Mancini A.M.
RivistaJournal of Crystal Growth
Volume248
Paginazione37-42
ISSN00220248
Parole chiaveHomoepitaxy, Impurities, Metallorganic vapor phase epitaxy, Photoluminescence, Secondary ion mass spectrometry, Substrates, Zinc compounds
Abstract

The growth of ZnTe by atmospheric pressure metalorganic vapour phase epitaxy on (100)ZnTe:P substrates is reported. The epilayers were grown at 340°C after in situ H2 heat cleaning of the substrate for surface oxide removal. Secondary ion mass spectrometry analysis of as-grown samples has shown that in situ treatment temperatures above 240°C are necessary. Moreover, no phosphorous incorporation occurs in the epilayers by either diffusion from the substrate or auto-doping through the vapour. Carbon is instead incorporated in the epilayers at concentrations higher than in the substrate. 4.2K photoluminescence (PL) measurements show a dominant band edge emission, whose main component at 2.3809eV is identified, by comparison with reflectance spectra, with the 1s-state free exciton line, its FWHM being 2.2meV. A weak 2s-state exciton line also appears on the high-energy side of the ground-state emission, further confirming the high optical quality and purity of the epilayers. Donor and acceptor bound exciton lines are also identified within the band edge region, whilst free-to-bound and donor-acceptor pair bands below 2.37eV in the PL spectra are ascribed to luminescence from the substrate. © 2002 Elsevier Science B.V. All rights reserved.

Note

cited By 6; Conference of Proceedings of the eleventh international conference on MOVPE XI ; Conference Date: 3 June 2002 Through 7 June 2002; Conference Code:60605

URLhttps://www.scopus.com/inward/record.uri?eid=2-s2.0-0037292516&doi=10.1016%2fS0022-0248%2802%2901855-9&partnerID=40&md5=055b6b914302d670317930c1551c23f3
DOI10.1016/S0022-0248(02)01855-9
Citation KeyLovergine200337