HgTe–CdTe heterojunction valence-band discontinuity

Abstract
In this paper we present experimental data related to the determination of the valence-band offset between HgTe and CdTe. Magneto-optical and resonant Raman scattering data are consistent with a small valence-band offset, i.e., Λ<100 meV. From our x-ray photoelectron spectroscopy (XPS) measurements carried out on CdTe//HgTe(1̄1̄1̄)B and HgTe//CdTe(1̄1̄1̄)B we found Λ=0.36±0.06 eV in very good agreement with data previously reported. We discuss the different assumptions made in the determination of Λ by XPS. The reason for such a discrepancy is not understood at the present time even though we propose two factors which could contribute to such a difference.
Keywords