The current-voltage (I-V) and capacitance-voltage (C-V) characteristics of
metal-organic compound conductive polymer-semiconductor
Al/P2ClAn(C2H5COOH)/p-Si structures were measured in the
temperature range 80–340 K. P2ClAn: the poly(2-chloroaniline). The P2ClAn
emeraldine salt was synthesized chemically by using propionic
(C2H5COOH) acid. The analysis of I-V characteristics based on the
thermoionic emission (TE) mechanism has revealed a decrease of zero-bias
barrier height and a increase of the ideality factor at lower temperatures.
Temperature dependence of the barrier height (BH) has shown a disagreement
with those calculated from C-V characteristics. This behaviour is attributed to
Schottky barrier inhomogeneities at interface. The temperature coefficient of
BH has been found to be -2.9×10-4 eV/K for
Al/P2ClAn(C2H5COOH)/p-Si. ln(I0/$T^{2})$ versus 1/T plot gives
activation energy and Richardson constant $A^{\ast}$ as 0.12 eV and
3.82×10-9 A/K2 cm2, respectively.