Abstract:
Polythiophene (PT) and Chlorophyll (CHLO) were organic materials. Polythiophene
was the conducting polymer that can exhibit electronic properties such as organic
solar cell which approach to those of some semiconductors. Chlorophyll was organic
materials which can react as photo receptor. In this work, materials were deposited in
bulk hetero-junction. Spin coating method was a technique that used to deposite the
combination of PT and CHLO thin film on the Aurum (Au) layer where Au thin film
would be prepared with three different ratio of 1:1, 1:5, 1:10 and reversed. The optical
characterization of thin film was measured using UV-Visible Spectrophotometer to
study the optical absorption and to calculate the energy gap of CHLO and PT and the
combinations of them. Four Point Probe, Pyronometer Sensor with Data Logger were
used to determine the film electrical properties. The electrical conductivity of the thin
film with different ratio was measured in the dark and under the light. From the
optical absorption study, the maximum wavelength of CHLO:PT thin film one peak.
The value of energy gap of CHLO was 5 .12 e V whereas PT was 3. 78 e V. The energy
band gap for the CHLO:PT thin film in ratio 1:1, 1:5, 1:10, 5:1 and 10:1 was 4.18 eV,
4.08 eV, 3.91 eV, 4.49 eV and 4.54 eV respectively. The conductivity of
CHLO:PT/Au in the dark were in the ranges of0.277 sm·
1
1
• While the
and 1.389 sm·
conductivity of CHLO:PT/Au in different intensities of light were in the ranges of
0 .154 sm ·
1
and 2 .218 sm · 1. Therefore, 1 : 1 thin film was chosen because of the
electrical conductivity exceeded the optimum rate value.