Fermi Level Position in the Cadmium Telluride Detector

The Fermi level position behavior in the CdTe single crystal was analyzed. The CdTe sample is p-type with the acceptor concentration N_A =10¹⁶ cm^-3. The CdTe sample transport characteristics were measured during time period of 17 hours. During this measurement the temperature was increased from 300 K up to 400 K and then decreased down to 300 K. The Fermi level position was calculated for this measurement. Calculations show that the Fermi level position doesn ´t change simultaneously with the temperature changing. The holes concentration depends on the Fermi level. The closer the Fermi level to the acceptor level, the higher the holes concentration.