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Bipolar transport observed through extraction currents on organic photovoltaic blend materials
Linköpings universitet, Institutionen för fysik, kemi och biologi, Biomolekylär och Organisk Elektronik. Linköpings universitet, Tekniska högskolan.
Linköpings universitet, Institutionen för fysik, kemi och biologi, Biomolekylär och Organisk Elektronik. Linköpings universitet, Tekniska högskolan.
Linköpings universitet, Institutionen för fysik, kemi och biologi, Biomolekylär och Organisk Elektronik. Linköpings universitet, Tekniska högskolan.
2006 (engelsk)Inngår i: Applied Physics Letters, ISSN 0003-6951, Vol. 89, s. 142111-Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

Both electron and hole mobilities have been simultaneously measured through charge extraction by linearly increasing voltage on polymer heterojunction solar cells with varying stoichiometry of polymer and acceptor. The polymer is a low band gap copolymer of fluorene, thiophene, and electron accepting groups named APFO-Green 5, and the acceptor is [6,6]-phenyl-C61-butyric acid methylester. Results are correlated to field effect transistor measurements on the same material system. A monotonous increase in mobility for both carrier types is observed with increased acceptor loading.

sted, utgiver, år, opplag, sider
2006. Vol. 89, s. 142111-
Emneord
polymer blends, organic semiconductors, fullerene compounds, solar cells, electron mobility, hole mobility, stoichiometry, carrier density
HSV kategori
Identifikatorer
URN: urn:nbn:se:liu:diva-12823DOI: 10.1063/1.2360199OAI: oai:DiVA.org:liu-12823DiVA, id: diva2:17126
Tilgjengelig fra: 2007-12-05 Laget: 2007-12-05
Inngår i avhandling
1. Electronic Transport in Polymeric Solar Cells and Transistors
Åpne denne publikasjonen i ny fane eller vindu >>Electronic Transport in Polymeric Solar Cells and Transistors
2007 (engelsk)Doktoravhandling, med artikler (Annet vitenskapelig)
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.

sted, utgiver, år, opplag, sider
Institutionen för fysik, kemi och biologi, 2007. s. 70
Serie
Linköping Studies in Science and Technology. Dissertations, ISSN 0345-7524 ; 1142
HSV kategori
Identifikatorer
urn:nbn:se:liu:diva-10380 (URN)978-91-85895-50-2 (ISBN)
Disputas
2007-11-20, Planck, Fysikhuset, Campus Valla, Linköpings Universitet, Linköping, 10:15 (engelsk)
Opponent
Veileder
Tilgjengelig fra: 2007-12-05 Laget: 2007-12-05 Sist oppdatert: 2017-01-11bibliografisk kontrollert

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