Rachel Aga (Advisor), William Feld (Committee Chair), Ioana Sizemore (Committee Member)
Master of Science (MS)
The choice of solvent and additive has been shown to affect efficiency of organic solar cell devices. To gain a basic understanding of the role of solvents in influencing overall device performance, we present a comparative study on the physical properties of donor: acceptor mixtures in different solvents. Investigations have been carried out for P3HT (poly(3-hexylthiophene-2,5-diyl)), PTB7 (poly[4,8-bis[(2-ethylhexyl)oxy]benzo[1,2-b:4,5-b']-dithiophene-2,6-diyl][3-fluro-2-[2-ethylhexyl)carbonyl[thieno[3,4-b]thiophenediyl]]), PC61BM ([6,6]-phenyl-C60-butyric acid methyl ester), and PC71BM ([6,6]-phenyl-C70-butyric acid methyl ester). The physical properties reported are based on UV-Vis absorption spectroscopy, resistance measurements, cyclic voltammetry measurements, and surface energy characterizations of the organic films. The solvents used to prepare the organic films are chlorobenzene and 1,2-dichlorobenzene, with and without 1,8-diiodooctane as an additive. The use of different solvents affects the intensity of absorption in the UV-Vis region and the extent of conjugation of the polymers. The surface energy measurements suggest corresponding modifications on the surface morphology of the films.
Department or Program
Department of Chemistry
Year Degree Awarded
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