Optoelectronic modeling of organic photovoltaic enhanced with plasmonic nanoparticles (Master thesis)
The maximum organic solar cell efficiencies are about 11-12%. Meanwhile the inorganic solar cells have efficiencies of 25%. However the efficiency of organic solar cells is constantly increasing, as well as their stability, through improvements in materials (active polymers, electrodes’ materials etc.) and in their production processes. The low OSCs efficiencies come from the low charge carrier mobilities in the organic semiconductors and high recombination rates. These two factors limit the thickness of the active layers and therefore the absorption. In order to increase the absorption within the active layer, we use a variety of light trapping mechanisms like the use of photonic structures, or metallic nanostructures. The most widespread technique is the usage of plasmonic nanostructures, which takes advantage of the plasmonic phenomena in order to enhance the efficiency. In this work we perform a full optoelectronic study of the behavior of two different nanoparticle sizes under two configurations each inside the active layer, keeping the active layer thickness fixed. The target is to study the effect of carrier mobility (electrons and holes, in the range from 10-7 to 10-10 m2/Vs for each carrier) on the plasmonic enhancement each plasmonic configuration causes. The results are always compared to a device without nanoparticles. We find that for different mobility values there is a different plasmonic configuration that yields the highest performance enhancement. In general, there is no mobility value combination for which we cannot find a proper plasmonic configuration. On the flip side, there are cases where the wrong plasmonic configuration can lead to serious performance losses. In most cases the largest losses are caused by small nanoparticles close to the anode side, a fact that is in agreement with recent optical simulations.
|Institution and School/Department of submitter:||Πανεπιστήμιο Ιωαννίνων. Πολυτεχνική Σχολή. Τμήμα Μηχανικών Επιστήμης Υλικών|
|Keywords:||Οργανικά φωτοβολταϊκά,Εντοπισμένα επιφανειακά πλασμόνια,Μεταλλικά νανοσωματίδια,Επανασυνδυασμός φορέων,Organic photovoltaics,Surface plasmon resonance,Metal nanoparticles,Carrier reconbination|
|Appears in Collections:||Διατριβές Μεταπτυχιακής Έρευνας (Masters)|
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|Μ.Ε. ΘΕΟΔΩΣΗ ΑΝΝΑ 2019.pdf||13.08 MB||Adobe PDF||View/Open|
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