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Organic photovoltaics (OPV ) is an emerging solar power technology in which the active layer consists of molecules that are built-up mostly from carbon and hydrogen. Motivations to use organic semiconductors include solution processibility and relative ease of tuning the optoelectronic properties by chemical design. OPV can also be extremely thin, flexible, and can potentially be mass-produced in a roll-to-roll (R2R) manner. However, OPV technologies still face major scientific challenges: high performance materials with good synthetic accessibility must be developed, processing solvents must be benign and renewable, and processing conditions must be relatable with large-scale printing.

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