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:
  

  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: https://science24.com/paper/8211 must be provided.

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 CdTe_0.97Se_0.03(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
18. ELECTRICAL AND OPTICAL PROPERTIES OF ZnO AND ZnO:Cr CRYSTALS, GROWN BY CVT METHOD
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
21. HIGH PRESSURE ANNEALING-INDUCED REDUCTION IN DEGREE OF COMPENSATION IN (Zn,Mn)Te CRYSTALS
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