Characterization of CdMnTe radiation detectors using current and charge transients  

作　　者：R.Rafiei M.I.Reinhard A.Sarbutt S.Uxa D.Boardman G.C.Watt E.Belas K.Kim A.E.Bolotnikov R.B.James 

机构地区：[1]Australian Nuclear Science and Technology Organisation,Lucas Heights,NSW,2234,Australia [2]School of Electrical,Electronic and Computer Engineering,The University of Western Australia,Crawley,WA,6009,Australia [3]Faculty of Mathematics and Physics,Institute of Physics,Charles University,Ke Karlovu 5,Prague 2,CZ-12116,Czech Republic [4]Brookhaven National Laboratory,Upton,NY 11973,USA [5]Department of Radiologic Science,Korea University,Seoul,136-703,Korea

出　　处：《Journal of Semiconductors》2013年第7期19-25,共7页半导体学报（英文版）

基　　金：supported in part by the Cooperative Research Centre for Biomedical Imaging Development

摘　　要：Charge transport characteristics of Cd_（0.95）Mn_（0.05）Te：In radiation detectors have been evaluated by combining time resolved current transient measurements with time of flight charge transient measurements.The shapes of the measured current pulses have been interpreted with respect to a concentration of net positive space-charge, which has resulted in an electric field gradient across the detector bulk.From the recorded current pulses the charge collection efficiency of the detector was found to approach 100%.From the evolution of the charge collection efficiency with applied bias,the electron mobility-lifetime product ofμ_nτ_n =（8.5±0.4）×10^（-4） cm^2/V has been estimated.The electron transit time was determined using both transient current technique and time of flight measurements in the bias range of 100-1900 V.From the dependence of drift velocity on applied electric field the electron mobility was found to beμ_n =（718±55） cm^2/（V·s） at room temperature.Charge transport characteristics of Cd_（0.95）Mn_（0.05）Te：In radiation detectors have been evaluated by combining time resolved current transient measurements with time of flight charge transient measurements.The shapes of the measured current pulses have been interpreted with respect to a concentration of net positive space-charge, which has resulted in an electric field gradient across the detector bulk.From the recorded current pulses the charge collection efficiency of the detector was found to approach 100%.From the evolution of the charge collection efficiency with applied bias,the electron mobility-lifetime product ofμ_nτ_n =（8.5±0.4）×10^（-4） cm^2/V has been estimated.The electron transit time was determined using both transient current technique and time of flight measurements in the bias range of 100-1900 V.From the dependence of drift velocity on applied electric field the electron mobility was found to beμ_n =（718±55） cm^2/（V·s） at room temperature.

关 键 词：radiation detector CDMNTE CMT detector fabrication transient current technique time of flighttechnique 

分 类 号：TL81[核科学技术—核技术及应用]