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Optimizing the power convertion efficiency of organic solar cells

Shishir, Md Tanvir Alam (2017). Optimizing the power convertion efficiency of organic solar cells. Bachelor of Engineering (4th Year Project) Thesis, Charles Darwin University.

Document type: Thesis
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Author Shishir, Md Tanvir Alam
Title Optimizing the power convertion efficiency of organic solar cells
Institution Charles Darwin University
Publication Date 2017-06
Thesis Type Bachelor of Engineering (4th Year Project)
Supervisor Singh, Jai
0906 - Electrical and Electronic Engineering
Abstract Sun is the main energy source for the entire solar system. Every year 385000 exajoules(EJ) of energy reaches from the sun to the earth, which is approximately 8000 times higher than the total energy demand of entire mankind. Solar cells convert sunlight into electrical energy. There are various types of solar cells, and the two main types are organic and inorganic solar cells. Organic solar cells (OSC) are cheap, flexible, light weight and have simpler fabrication process compared to the inorganic solar cells. But the main disadvantage of OSC is that the electrical power conversion efficiency is very poor owing to poor exciton diffusion and low charge carrier mobility. There are various types of OSCs depending on their junction type, architecture and materials. Bulk Heterojunction OSC is the most promising type, its power conversion efficiency is around 11.6%. The operation of OSC depends on four steps: 1) Photon absorption and the creation of excitons 2) Exciton diffusion to the donor-acceptor interface 3) Exciton relaxation into a charge transfer exciton state and simultaneous dissociation into free charge carriers and 4) Collection of free charge carriers at their respective electrodes (here, holes go the anode and electrons to the cathode). Optimization of any of these mechanisms can lead to improvement in the overall photoconversion efficiency (PCE) of the OSC. In this thesis, different organic material properties will be studied, and a new ideas will be proposed to improve the exciton diffusion to the donor-acceptor interface.
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Created: Tue, 01 Aug 2017, 14:24:12 CST by Jessie Ng