Electrical contacts to semi-insulating (Cd,Mn)Te:V

Marta Witkowska-Baran ,  Andrzej Mycielski ,  Andrzej J. Szadkowski ,  Wojciech Kaliszek ,  Barbara Witkowska 

Polish Academy of Sciences, Institute of Physics, al. Lotników 32/46, Warszawa 02-668, Poland


The high-resistivity (Cd,Mn)Te is believed to be suitable to succesfully replace the commonly used (Cd,Zn)Te system as a material for manufacturing large-area X- and γ-ray detectors.

The purpose of our study was to elaborate a method of preparing high quality (Cd,Mn)Te crystal plates as well as a technique of producing good electrical contacts to that material.

(Cd,Mn)Te was grown using the Bridgman method. The crystals were doped with vanadium to the level of 1016 cm-3 . The crystals are twinned in the (111) plane, but by slicing the crystal parallel to the twinning plane we obtained monocrystalline plates of large area (e.g. 30 × 30 mm2), which is essential for application purposes. Proper annealing of those plates in cadmium vapours allowed us to reduce the number of cadmium vacancies forming during the growth process. Due to the vanadium dopant acting as a compensating centre we obtained a semi-insulating material. In order to obtain good contacts to the (Cd,Mn)Te plates we used the method proposed initially for CdTe by D. Rioux [1]. The ZnTe:Sb layers (~1 μm thick) were grown on the epi-ready (Cd,Mn)Te:V plates by the MBE technique. The grown layers were p‑type and formed a good electrical contact to the crystal plates. Finally - a standard tech­nique was used to cover the ZnTe layer by a metal layer. The contacts formed on both the (100) and (111) surfaces of (Cd,Mn)Te were studied. We believe that the contacts to the (111) surface are important for applications.
In the paper we describe techniques of preparing electrical contacts and results of their characterization.

This work was partially funded by the Polish Ministry of Science and Higher Education
through grant 3 T08A 046 30.

[1] D. Rioux, D. W. Niles, H. Höchst, J. Appl. Phys. 73, 12 (1993)

Legal notice
  • Legal notice:

    Copyright (c) Pielaszek Research, all rights reserved.
    The above materials, including auxiliary resources, are subject to Publisher's copyright and the Author(s) intellectual rights. Without limiting Author(s) rights under respective Copyright Transfer Agreement, no part of the above documents may be reproduced without the express written permission of Pielaszek Research, the Publisher. Express permission from the Author(s) is required to use the above materials for academic purposes, such as lectures or scientific presentations.
    In every case, proper references including Author(s) name(s) and URL of this webpage: http://science24.com/paper/8211 must be provided.


Related papers
  1. (Cd, Mn)Te Crystals for X and Gamma Radiation Detectors - an Alternative Material to CdTe and (Cd,Zn)Te. 
  2. SEM studies of the etched surface of (Cd,Mn)Te
  3. The influence of growth atmosphere on the self-selection of the grains during ZnO crystal growth
  4. Far-infrared and Raman Spectroscopy of CdTe0.97Se0.03(In)
  5. Influence of hydrogen on hydrogenated cadmium telluride optical spectra
  6. Additional  Phonon Modes related to intrinsic defects in CdHgTe
  7. Phonon and vibrational spectra of real crystals obtained using the synchrotron radiation
  8. ZnO homoepitaxial growth by Atomic Layer Epitaxy technique.
  9. Preparation of the ZnO substrate surface
  10. Influence of hydrogen on optical spectra of hydrogenated CdTe
  11. Effect of the Annealing Atmosphere on the Quality of ZnO Crystal Surface
  12. Structure properties of bulk ZnO crystals
  13. Materials requirements in the group - CdTe, CdZnTe and CdMnTe - and recent advances for X-ray and gamma-ray applications.
  14. Applications of the II-VI semimagnetic semiconductors
  15. Is the (Cd,Mn)Te crystal a prospective material for X-ray and γ-ray detectors?
  16. The local crystalline structure of ZnCdTe alloys obtained by Far Infrared Synchrotron Radiation measurements
  17. Defects induced by oxygen and hydrogen in CdTe crystals
  19. Structural and optical characterization of epitaxial layers of CdTe/PbTe grown on BaF2 (111) substrates
  20. Low-frequency magnons and phonons in hexagonal MnTe
  22. CVT contactless growth of ZnO crystals
  23. Mn doped ZnTe (110) (1x1) surface in Resonant Photoemission study
  24. Differential Reflectivity and Photoemission study of ZnTe and CdTe(110) surface

Presentation: Poster at E-MRS Fall Meeting 2006, Symposium F, by Marta Witkowska-Baran
See On-line Journal of E-MRS Fall Meeting 2006

Submitted: 2006-05-24 17:33
Revised:   2009-06-07 00:44
Web science24.com
© 1998-2022 pielaszek research, all rights reserved Powered by the Conference Engine