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arXiv · 1110.2671

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

Julia Kern·Sebastian Schwab·Carsten Deibel·Vladimir Dyakonov
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Abstract

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.

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Julia Kern, Sebastian Schwab, Carsten Deibel, Vladimir Dyakonov. 2011-10-12. Binding energy of singlet excitons and charge transfer complexes in MDMO-PPV:PCBM solar cells. https://doi.org/10.1002/pssr.201105430

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