posted on 2012-03-21, 00:00authored byY. Chang, C.H. Grein, C.R. Becker, X.J. Wang, Q. Duan, S. Ghosh, P. Dreiske, R. Bommena, J. Zhao, M. Carmody, F. Aqariden, S. Sivananthan
CdZnTe-based heterojunctionp-i-n or M-π-n detectors using HgTe/CdTe superlattice contacts are modeled and designed to reduce leakage currents under high electric fields and thereby improve X-ray and γ-ray detector performance. The employment of an n-type HgTe/CdTe superlattice as a contact layer can theoretically result in significantly less leakage current compared to a contact layer using either bulk semiconductors or metal contacts. The benefits arise from the ability to design HgTe/CdTesuperlattices to have large carrier effective masses in the electric field direction, which results in low carrier velocities. Nevertheless the density of states is lower than that of a comparable bulk semiconductor, which results in low carrier concentrations.
Funding
This work was supported by Department of Energy, NNSA Service Center, Office of Nonproliferation Research and Development (NA-22) Proliferation Detection Program under grant number DE-FG52-08NA28765.