Issue
Le Journal de Physique IV
Volume 03, Number C5, Octobre 1993
Third International Conference on Optics of Excitons in Confined
Page(s) C5-429 - C5-432
DOI https://doi.org/10.1051/jp4:1993592
Third International Conference on Optics of Excitons in Confined

Le Journal de Physique IV 03 (1993) C5-429-C5-432

DOI: 10.1051/jp4:1993592

Non-linear piezoelectric effect in CdTe and CdZnTe

R. ANDRÉ1, C. BODIN1, J. CIBERT1, L.S. DANG1 and G. FEUILLET2

1  Laboratoire de Spectrométrie Physique, URA 08 du CNRS, Université Joseph Fourier, Grenoble I, BP. 87, 38402 Saint Martin d'Hères cedex, France
2  DRFMC - SP2M - PSC, Centre d'Etudes Nucléaires de Grenoble, BP. 85X, 38041 Grenoble cedex, France


Abstract
Strained quantum wells (QWs) grown along the polar axis (111) in a zincblende semiconductor exhibit a piezoelectric field. This field strongly modifies the energy of excitons confined in QWs. We have extracted, from optical measurements of excitonic transitions, the piezoelectric field value in a large set of QWs : CdTe/CdZnTe, CdTe/CdMnTe, CdZnTe/CdMnTe. By suitably choosing the composition of alloys, we have obtained different values of strains (compressive or extensive) due to the lattice mismatch between QWs and barriers. The non-linear piezoelectric effect appears clearly when plotting the piezoelectric tensor component e14 versus lattice mismatch. For example el4 increases from 0.07 C/m2 to 0.15 C/m2 when the lattice mismatch varies from - 0.3% to - 1.7%.



© EDP Sciences 1993