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Binding energy of singlet excitons and charge transfer complexes in MDMO-PPV:PCBM solar cells

The influence of an external electric field on the photoluminescence intensity of singlet excitons and charge transfer complexes is investigated for a poly[2-methoxy-5-(3',7'-dimethyloctyloxy)-1,4-phenylenevinylene] (MDMO-PPV) diode and a bulk heterojunction of the PPV in combination with [6,6]-phenyl-C61 butyric acid methylester (PCBM), respectively. The experimental data is related to the dissociation probability derived from the Onsager-Braun model. In this way, a lower limit for the singlet exciton binding energy of MDMO-PPV is determined as (327 +- 30) meV, whereas a significantly lower value of (203 +- 18) meV is extracted for the charge transfer complex in a MDMO-PPV:PCBM blend.

preprint2011arXivOpen access
Julia KernSebastian SchwabCarsten DeibelVladimir Dyakonov
cond-mat.mtrl-sciphysics.chem-ph
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Julia KernSebastian SchwabCarsten DeibelVladimir Dyakonov

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