Istituto dei materiali per l'elettronica ed il magnetismo     
Dubecky F., Zatko B., Bohacek P., Gombia E., Hubik P., Chromik S. Study of bulk semi-insulating radiation detectors: Role of ohmic contact metallization in electrical charge transport and detection performance. In: Proceedings of the Ieee, vol. ASDAM 2008 pp. 295 - 298. Institute of Electrical and Electronics Engineers, Inc, 2008.
Current-voltage characteristics of radiation detectors structures based on semi-insulating GaAs obtained with new types of metallizations used to form quasi-ohmic contacts are dscribed. three different metals (In, Gd and Mg), having lower work function in comparison with the standard AuGeNi alloy,were used.Such contacts, which could replace standard alloyed N+ ohmic contact, show an unusual electrical chargetransport asdeduced from the measured I-V characteristics. Pulse-height spectra of Am241and Co57 radionuclide sources detected by the structures are also reported.
DOI: 10.1109/ASDAM.2008.4743341
Subject GaAs
radiation detectors
ohmic contacts
73.40.Sx, 73.61.Ey

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