TEMPERATURE-DEPENDENT SPACE-CHARGE-LIMITED CURRENTS IN AMORPHOUS AND DISORDERED SEMICONDUCTORS

The temperature dependent space-charge-limited currents (SCLCs), manif ested by the dependence of the apparent pre-exponential factor of spac e-charge-limited (SCL) conductivity on the injection dependent activat ion energy, is examined. Starting from the exact theory of SCLC, the f ormula for the activation energy of SCL injection dependent conductivi ty was derived, The method of SCL currents seems to be a unique method to determine the true electrical conductivity pre-exponential factor of the electrical conductivity. Systematic determination of the relati on of the pre-exponential factor of the conductivity on its activation energy during the measurements of voltage and temperature dependencie s of SCL currents gives information on the reliability of the reconstr uction of the density-of-electronic states. (C) 1996 American Institut e of Physics.