Special Seminar: Organic Solar Cells Revisited
Seminar | August 10 | 1-2 p.m. | Cory Hall, 540 A/B
Bulk-heterojunction polymer solar cells (PSCs) are composed of a blend active layer of a p-type conjugated polymer as donor and an n-type semiconductor as acceptor sandwiched between an anode and a cathode where at least one of the two electrodes should be transparent. Over the last decade soluble fullerene derivatives (PC60BM,PC70BM,ICBA) were the only choice of n-type semiconductors for PSCs while there have been over thousands of donor materials synthesized as donor materials such as conjugated polymers, small molecules, dyes and so on so forth. Efficiencies have reached up to 12% with fullerene derivatives with tedious nano-morphology re-arrangements using solvent additives. However, the voltage output of the fullerene blends remained low (70%. Non-fullerene acceptors, i.e. small molecule acceptors, emerged as a new horizon to organic photovoltaics in the last few years. Due to their ease of structural modification and better miscibility with donor materials efficiencies up to 14 % have already been achieved in just few years.
This talk will give a thorough overview of organic solar cells for printable organic electronics applications. In particular, the state-of-the-art of organic solar cells will be discussed, strategies to exceed the current limitations of fullerene solar cells using small molecule acceptors will be elaborated and presented.
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