The main focus in this work is to study the electrical properties and efficiency of the mixtureof organic materials that can absorb wide range of light spectrum. Polythiophene (PT) as the main active ingredient acts as a acceptor that absorb light in range 200 -350 nm, while the tris (8-hidroxyquinoline aluminum)(Alq3)and chlorophyll acts as a donor that can absorb light from 350 nm to 700 nm. The combination of PT:Alq3:Chlo is called as bulk heterojunction in organic solar cell.The thin film of the mixture was deposited by using spin coating technique. The energy gap and electrical conductivity of thin films were measured by UV-VIS and 4-point probe respectively. The efficiency of thin film solar cell was determined by 2-point probe. Result of energy band gap of PT:Alq3:Chlo thin film is about 3.72+ 0.02 eV. The electrical conductivity showed increase with the increasing of light intensity. The conductivity of PT:Alq3:Chlo thin film at ratio 3:1:2 under radiation of 100Wm-2 is about 0.250+ 0.001 Scm-1 andthe power conversion efficiency is ~7.16%.
In this work, ZnO nanorod has been grown by hydrothermal solution method. The samples were prepared by two stages. The first stage was seeding process where the ZnO nanoparticles are spin-casted onto ITO coated glasses and the second stage was hydrothermal process. The morphology of nanorods were investigated by using scanning electron microscope (SEM) and different of length and diameter of nanorods with different growth durations have been observed. The differences of diameters and aspect ratio of nanorods have affected the optical and electrical properties of the ZnO-coated thin film with dye due to its surface area and morphologies of growth rod. Aspect ratio of ZnO nanorods increases by increasing the reaction time (growth time). From the band gap energy study, the thin film with the longest ZnO nanorods growth time has the lowest band gap energy (3.55 eV). The higher aspect ratio of the nanorod affected the conductivity, by increasing the conductivity when combined with N3 dye.
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