Temperature dependence of Schottky diode characteristics prepared with photolithography technique

Abstract

A Richardson constant (RC) of 8.92 Acm(-2)K(-2) from the conventional Richardson plot has been obtained because the current-voltage data of the device quite well obey the thermionic emission (TE) model in 190-320 K range. The experimental nT versus T plot of the device has given a value of T-0 = 7.40 K in temperature range of 160-320 K. The deviations from the TE current mechanism at temperatures below 190 K have been ascribed to the patches introduced by lateral inhomogeneity of the barrier heights. Therefore, an experimental RC value of 7.49 A(cmK)(-2) has been obtained by considering Tung's patch model in the temperature range of 80-190 K. This value is in very close agreement with the known value of 8.16 Acm(-2)K(-2) for n-type GaAs.