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Stoichiometry, mobility, and performance in bulk heterojunction solar cells
Linköping University, Department of Physics, Chemistry and Biology, Biomolecular and Organic Electronics . Linköping University, The Institute of Technology.
Linköping University, Department of Physics, Chemistry and Biology, Biomolecular and Organic Electronics . Linköping University, The Institute of Technology.
Linköping University, Department of Physics, Chemistry and Biology, Biomolecular and Organic Electronics . Linköping University, The Institute of Technology.
2007 (English)In: Applied Physics Letters, ISSN 0003-6951, E-ISSN 1077-3118, Vol. 91, no 7, 071108- p.Article in journal (Refereed) Published
Abstract [en]

Bipolar transport in blends of a copolymer of fluorene, thiophene and electron accepting groups, and the substituted fullerene [6,6]-phenyl-C61-butyric acid methylester have been studied through charge extraction by linearly increasing voltage on solar cells and with field effect transistors. Between 10% and 90% polymer has been used and the results show a clear correlation to solar cell performance. Optimal solar cells comprise 20% polymer and have a power conversion efficiency of 3.5%. The electron mobility is increasing strongly with fullerene content, but is always lower than the hole mobility, thus explaining the low amount of polymer in optimized devices.

Place, publisher, year, edition, pages
2007. Vol. 91, no 7, 071108- p.
Keyword [en]
electron mobility, field effect transistors, fullerenes, hole mobility, polymer blends, solar cells, stoichiometry
National Category
Natural Sciences
Identifiers
URN: urn:nbn:se:liu:diva-12824DOI: 10.1063/1.2771524OAI: oai:DiVA.org:liu-12824DiVA: diva2:17127
Available from: 2007-12-05 Created: 2007-12-05 Last updated: 2017-12-14
In thesis
1. Electronic Transport in Polymeric Solar Cells and Transistors
Open this publication in new window or tab >>Electronic Transport in Polymeric Solar Cells and Transistors
2007 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

The main topic of this dissertation is electronic charge transport in polymeric and molecular organic materials and material blends intended for solar cell applications. Charge transport in polymers is a strange beast and carrier mobility is rarely a well-defined number. Measurements on different sample geometries and under different conditions tend to give different results and when everything is to be related to solar cell performance it is imperative that there is a way to correlate the results from different measurements. Polymer solar cells utilize composite materials for their function. This puts an additional twist on charge transport studies, as there will also be interaction between the different phases to take into account.

Several measurement techniques have been used and their interrelationships as well as information on their relevance for solar cells have been investigated. Field effect transistors (FET) with an organic active layer have proved to be one of the more versatile measurement geometries and are also an interesting topic in itself. FETs are discussed both as a route for material characterization and as components. A main result correlates bias stress in organic field effect transistors with the electronic structure of the material.

Power conversion efficiency in solar cells is discussed with respect to electrical properties. The interaction of different blend materials and the impact of stoichiometry on transport properties in the active layer have been investigated. Results indicate that charge transport properties frequently are a key determining factor for which material combinations and ratios that works best.

Some work on the conductive properties of nano-fibers coated with semiconducting polymers has also been done and is briefly discussed. The conductive properties of nano-fibers have been studied through potential imaging.

Place, publisher, year, edition, pages
Institutionen för fysik, kemi och biologi, 2007. 70 p.
Series
Linköping Studies in Science and Technology. Dissertations, ISSN 0345-7524 ; 1142
National Category
Physical Sciences
Identifiers
urn:nbn:se:liu:diva-10380 (URN)978-91-85895-50-2 (ISBN)
Public defence
2007-11-20, Planck, Fysikhuset, Campus Valla, Linköpings Universitet, Linköping, 10:15 (English)
Opponent
Supervisors
Available from: 2007-12-05 Created: 2007-12-05 Last updated: 2017-01-11Bibliographically approved

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Andersson, Lars MattiasZhang, FenglingInganäs, Olle

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