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Influence of doping on charge carrier collection in normal and inverted geometry polymer : fullerene solar cells

Title data

Dibb, George F. A. ; Muth, Mathis-Andreas ; Kirchartz, Thomas ; Engmann, Sebastian ; Hoppe, Harald ; Gobsch, Gerhard ; Thelakkat, Mukundan ; Blouin, Nicolas ; Tierney, Steven ; Carrasco-Orozco, Miguel ; Durrant, James R. ; Nelson, Jenny:
Influence of doping on charge carrier collection in normal and inverted geometry polymer : fullerene solar cells.
In: Scientific Reports. Vol. 3 (2013) . - p. 3335.
ISSN 2045-2322
DOI: https://doi.org/10.1038/srep03335

Project information

Project title:
Project's official titleProject's id
Fotophysik synthetischer und biologischer multichromophorer SystemeNo information

Project financing: Andere

Abstract in another language

While organic semiconductors used in polymer:fullerene photovoltaics are generally not intentionally doped, significant levels of unintentional doping have previously been reported in the literature. Here, we explain the differences in photocurrent collection between standard (transparent anode) and inverted (transparent cathode) low band-gap polymer:fullerene solar cells in terms of unintentional p-type doping. Using capacitance/voltage measurements, we find that the devices exhibit doping levels of order 1016 cm−3, resulting in space-charge regions ~100 nm thick at short circuit. As a result, low field regions form in devices thicker than 100 nm. Because more of the light is absorbed in the low field region in standard than in inverted architectures, the losses due to inefficient charge collection are greater in standard architectures. Using optical modelling, we show that the observed trends in photocurrent with device architecture and thickness can be explained if only charge carriers photogenerated in the depletion region contribute to the photocurrent.

Further data

Item Type: Article in a journal
Refereed: Yes
Institutions of the University: Faculties
Faculties > Faculty of Biology, Chemistry and Earth Sciences
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Chemistry
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Chemistry > Chair Macromolecular Chemistry I
Profile Fields
Profile Fields > Emerging Fields
Profile Fields > Emerging Fields > Energy Research and Energy Technology
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Chemistry > Professorship Applied Functional Polymers > Professorship Applied Functional Polymers - Univ.-Prof. Dr. Mukundan Thelakkat
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Chemistry > Professorship Applied Functional Polymers
Result of work at the UBT: Yes
DDC Subjects: 500 Science > 540 Chemistry
Date Deposited: 12 Apr 2016 06:57
Last Modified: 21 Jul 2016 07:12
URI: https://eref.uni-bayreuth.de/id/eprint/1152