Bulk vs. surface recombination in polymer-fullerene solar cells

Carsten Deibel; Thomas Strobel; Alexander Wagenpfahl; Moritz Limpinsel; Markus Mingebach; Vladimir Dyakonov

doi:10.1117/12.826022

27 August 2009 Bulk vs. surface recombination in polymer-fullerene solar cells

Carsten Deibel, Thomas Strobel, Alexander Wagenpfahl, Moritz Limpinsel, Markus Mingebach, Vladimir Dyakonov

Proceedings Volume 7416, Organic Photovoltaics X; 74160Q (2009) https://doi.org/10.1117/12.826022
Event: SPIE Photonic Devices + Applications, 2009, San Diego, California, United States

Abstract

State-of-the art polymer-fullerene solar cells reach power conversion efficiencies of up to 6%, featuring low polaron recombination rates. In order to identify limiting factors, we investigated the photocurrent of poly(3-hexyl thiophene) (P3HT):[6,6]-phenyl-C61 butyric acid methyl ester (PCBM) solar cells experimentally. From our investigations, we find the photocurrent to be determined mainly by polaron pair dissociation and charge extraction. Focussing on the polaron pair dissociation, we apply Monte Carlo simulations in order to understand the unexpectedly high internal yield of this separation process. We find that a long effective conjugation length of the polymer chains leads to delocalisation of the positively charged constituent of polaron pairs, a hole, making it easier to escape the Coulomb attraction to the electron. However, we identify an additional loss mechanisms, which our Monte Carlo simulations show to be significant: losses of polaron pairs at the semiconductor/electrode interfaces due to diffusion of the pairs. We discuss how the different processes influencing the photocurrent can be accounted for analytically.

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Carsten Deibel, Thomas Strobel, Alexander Wagenpfahl, Moritz Limpinsel, Markus Mingebach, and Vladimir Dyakonov "Bulk vs. surface recombination in polymer-fullerene solar cells", Proc. SPIE 7416, Organic Photovoltaics X, 74160Q (27 August 2009); https://doi.org/10.1117/12.826022

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KEYWORDS

Polarons

Solar cells

Monte Carlo methods

Polymers

Diffusion

Electrodes

Heterojunctions

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