Fabrictaion of an active layer of organic solar cell (OSC) by using spray coating

Khairunisa, Binti Kamarudin (2017) Fabrictaion of an active layer of organic solar cell (OSC) by using spray coating. [Final Year Project Report] (Unpublished)

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Abstract

Organic solar cell (OSC) is a renewable energy device that used to convert sunlight into electrical energy. OSC consists of single layer, bilayer and bulk-heterojunction structures. Bulk-heterojunction structure consists of anode electrode, hole transporting layer, active layer, electron transporting layer, cathode electrode and substrate. Nowadays, OSC has a lot of demand because of its production is cheaper than the inorganic solar cell where the spray coating method is introduced due to its ability to reduce waste of fluid quantity and low investment costs. Therefore, this study was conducted in order to observe the difference of surface morphology and thickness between spin and spray coating methods when an active layer of P3HT:PCBM in chlorobenzene was fabricated on the glass substrate. Apart from that, I also want to examine at which parameters of spray coating method are able to produce a filmthickness near to the thickness of the spin coating method. Therefore, the parameters included the distance between nozzle and glass substrate, number of spray times and pressure of airbrush have been taken into account. The data of thickness measurement for spin and spray coating methods was graphed with high-low lines in order to facilitate reporting of observational studies. Furthermore, the comparison between surface morphology of spin and spray coated samples have also been observed and studied by using the SEM and AFM images. The SEM and AFM are used to read across the surface of the samples and they are capable to sense the smallest variations on the surface of a material. However, the AFM can produce a greater level of detail for surfaces when compared to SEM. Based on the results of this study, the spray coating method is able to produce a film-thickness nearest to the thickness of spin coating at the parameters of 10 cm height, 8 spray times and airbrush pressure of 0.1 MPa. Besides, the spray coating method is also able to produce a smoother surface morphology than spin coating method.

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