H. AKTHER1
1=Dr. Hasina Akther, Assistant Professor, Department of Physics, Bangladesh University of Textiles, Dhaka, Bangladesh.
Email: hasinabutex@gmail.com
ABSTRACT
The study was conducted at the Department of Physics, Bangladesh University of Textiles (BUTEX), Dhaka, Bangladesh during 2018. Plasma Polymerized N, N, 3, 5 tetramethylaniline PPTMA) thin films were deposited by a capacitive coupled glow discharge reactor. PPTMA thin films were grown onto glass substrates at room temperature using N, N, 3, 5 tetramethylaniline as a precursor. The current density-voltage characteristic of as deposited PPTMA at different thickness has been investigated at different temperatures. The J-V characteristics show two slopes at the lower and higher voltage regions. It is observed that space charge limited conduction is operative in the higher voltage region in PPTMA thin films. From the experimental studies the carrier mobility and the free carrier density are found to be about 1.310-13m2 V-1s-1 and 21021m-3 respectively. The activation energies are about 0.19 0.02 eV at the lower temperature region and 0.85 0.05 eV at the higher temperature region for both the applied voltages. The capacitance and ac electrical conductance of PPTMA thin films were measured as functions of frequency (100 < f < 105 Hz) and temperature (300 < T < 450K). The electrical conductivity is more dependent on temperature in the low frequency region than that in the high frequency region. In PPTMA thin films the conduction may be dominated by hopping of carriers between the localized states at low temperatures and thermally excited at the high temperatures.
Keywords: N, N, 3, 5 tetramethylaniline , Plasma polymerization, Organic materials, Electrical property and Dielectric constant.