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

• Published in: Thin solid films 2007-06, Vol.515 (18), p.7253-7258
• Main Authors: Özdemir, Ahmet Faruk, Gök, Ayşegül, Türüt, Abdülmecit
• Format: Article
• Language: English
• Subjects: Capacitance and current characteristics; Condensed matter: electronic structure, electrical, magnetic, and optical properties; Electrical properties; Electronic structure and electrical properties of surfaces, interfaces, thin films and low-dimensional structures; Electronic transport phenomena in thin films and low-dimensional structures; Exact sciences and technology; Heterojunction; Metal–organic semiconductor–inorganic semiconductor contact; Physics; Polymer; Surface and interface; Traps
• ISSN: 0040-6090; 1879-2731
• DOI: 10.1016/j.tsf.2007.02.104

Al/P2ClAn(CH 3COOH)/p-Si/Al structure has been obtained by evaporation of the polymer P2ClAn(CH 3COOH) 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 (CH 3COOH). It has been seen that the current–voltage characteristics of the heterojunction obey to space charge-limited current model. Furthermore, P2ClAn(CH 3COOH) was characterized by using Fourier Transform Infrared (FTIR) and Ultraviolet–Visible (UV–Vis) spectroscopies. An average value of μ, 2.43 × 10 − 5  cm 2 V − 1 s − 1 , was obtained for the mobility of the P2ClAn(CH 3COOH); this value is in agreement with the value of about 10 − 4  cm 2 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 × 10 11 cm − 2 eV − 1 for interface state density has been obtained from the frequency–capacitance characteristics.