Origin of the Efficient Polaron Pair Dissociation in Polymer--Fullerene Blends

Details Origin of the Efficient Polaron Pair Dissociation in Polymer--Fullerene Blends Origin of the Efficient Polaron Pair Dissociation in Polymer--Fullerene Blends

2009-06-13

arxiv.org/abs/0906.2486v2

Phys. Rev. Lett. 103, 036402 (2009)

Physics

Condensed Matter

Materials Science

4 pages, 2 figures. Changes: text shortened during proof stage

Scientific paper

10.1103/PhysRevLett.103.036402

The separation of photogenerated polaron pairs in organic bulk heterojunction solar cells is the intermediate but crucial step between exciton dissociation and charge transport to the electrodes. In state-of-the-art devices, above 80% of all polaron pairs are separated at fields of below $10^7$V/m. In contrast, considering just the Coulomb binding of the polaron pair, electric fields above $10^8$V/m would be needed to reach similar yields. In order to resolve this discrepancy, we performed kinetic Monte Carlo simulations of polaron pair dissociation in donor--acceptor blends, considering delocalised charge carriers along conjugated polymer chain segments. We show that the resulting fast local charge carrier transport can indeed explain the high experimental quantum yields in polymer solar cells.

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