The electrical measurements in poly(2-chloroaniline) based thin film sandwich devices

Al/P2ClAn(CH3COOH)/p-Si/Al structure has been obtained by evaporation of the polymer P2ClAn(CH3COOH) on the front surface of p-type silicon substrate, P2ClAn: the poly(2-chloroaniline). The P2ClAn emeraldine salt was chemically synthesized by using acetic acid (CH3COOH). It has been seen that the current–voltage characteristics of the heterojunction obey to space charge-limited current model. Furthermore, P2ClAn(CH3COOH) was characterized by using Fourier Transform Infrared (FTIR) and Ultraviolet–Visible (UV–Vis) spectroscopies. An average value of μ, 2.43 × 10− 5 cm2 V− 1 s− 1, was obtained for the mobility of the P2ClAn(CH3COOH); this value is in agreement with the value of about 10− 4 cm2 V− 1 s− 1 given for the conjugated polymeric thin films in the literature. Low capacitance–voltage–frequency and conductance–frequency measurements have been made at the voltages of 0.00, 0.02 and 0.30 V in the frequency range of 100 Hz–2.0 MHz. An average value of 7.91 × 1011 cm− 2 eV− 1 for interface state density has been obtained from the frequency–capacitance characteristics.