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Designing of bulk heterojunction organic thin film solar cells for optimal photovoltaic performance

Asif, Umar (2015). Designing of bulk heterojunction organic thin film solar cells for optimal photovoltaic performance. Master Thesis, Charles Darwin University.

Document type: Thesis
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Author Asif, Umar
Title Designing of bulk heterojunction organic thin film solar cells for optimal photovoltaic performance
Institution Charles Darwin University
Publication Date 2015
Thesis Type Master
Subjects 0906 - Electrical and Electronic Engineering
090608 - Renewable Power and Energy Systems Engineering (excl. Solar Cells)
Abstract Organic solar cells (OSCs) have recently been centre of attention for researchers due to many advantages they have on inorganic solar cells (ISCs). Some of the key advantages include low cost, easy fabrication techniques, large scale production and thinness [1]. Organic solar cells can be categorised into different types depending on their architecture; type of junction, active layer and electrode materials. There are four main processes involved in operation of an OSC; namely photon absorption and exciton formation, exciton transportation to the interface, exciton dissociation at the interface and collection of free charges to respective electrodes [6]. These four processes contribute to the overall efficiency of OSCs. Improving any of the four processes may help to increase the overall efficiency of OSCs [6]. The aim here is to work on these processes to improve the overall efficiency of OSCs.

At present bulk heterojunction solar cells (BHJ) are considered to be the most efficient organic solar cells. Till date the maximum efficiency achieved for an OSC is close to 10% which is still relatively low compared to many inorganic solar cells in the market [2]. In this thesis different organic material properties have been studied for their use as donor and acceptor materials. Improved rate of dissociation of excitons have been achieved using best possible donor acceptor materials. A new idea of possible creation of excitons in the acceptor material has been presented here. These excitons created in acceptor could dissociate at the interface to contribute towards overall efficiency of OSCs. Organic Solar Cells selected based on their properties and rates of dissociation, have been optimized with the layer thickness using semiconducting thin film optics simulation software (SETFOS).
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