Abstract:
This work was focused on the study of electrical conductivity to the combination of
Polythiophene thin film (PT) and Chlorophyll thin film (CHLO) by layered on Indium
Tin Oxide substrate (ITO) as p-n heterojunction solar cell. Polythiophene thin film is
deposited to the ITO substrate by using electrochemistry method. Chlorophyll thin
film is coated on Polythiophene thin film by using the spin coating method. Current
and voltage of ITO/PT/CHLO thin film is measured in the dark and under different
light intensity by using the four point probe. The result shows that Polythiophene thin
film is successfully coated with Chlorophyll on ITO substrate with different
thicknesses. Electrical conductivity in the dark showed an increasing with the
increasing of Polythiophene thin film thickness. While, with the increasing of
Chlorophyll thin film thickness, electrical conductivity in the dark is consecutively
change. Electrical conductivity under different intensity of light increased with the
increasing of light intensity. Electrical conductivity under intensity of light are
diminished with the increasing of Polythiophene thin film thickness. While electrical
conductivity is increase with the increasing of the light intensity and the increasing of
Chlorophyll thin film thickness. In conclussion, combination of the thinnest
Polythiophene thin film with the thickest Chlorophyll thin film produce the highest
electrical conductivity reach up to ± 0.1 Sm-1 (raise 22% under illumination compared
to the electrical conductivity in the dark condition). This study is suitable to generate a
solar cell.