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Stoichiometry, mobility, and performance in bulk heterojunction solar cells
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.
2007 (Engelska)Ingår i: Applied Physics Letters, ISSN 0003-6951, E-ISSN 1077-3118, Vol. 91, nr 7, s. 071108-Artikel i tidskrift (Refereegranskat) 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.

Ort, förlag, år, upplaga, sidor
2007. Vol. 91, nr 7, s. 071108-
Nyckelord [en]
electron mobility, field effect transistors, fullerenes, hole mobility, polymer blends, solar cells, stoichiometry
Nationell ämneskategori
Naturvetenskap
Identifikatorer
URN: urn:nbn:se:liu:diva-12824DOI: 10.1063/1.2771524OAI: oai:DiVA.org:liu-12824DiVA, id: diva2:17127
Tillgänglig från: 2007-12-05 Skapad: 2007-12-05 Senast uppdaterad: 2017-12-14
Ingår i avhandling
1. Electronic Transport in Polymeric Solar Cells and Transistors
Öppna denna publikation i ny flik eller fönster >>Electronic Transport in Polymeric Solar Cells and Transistors
2007 (Engelska)Doktorsavhandling, sammanläggning (Övrigt vetenskapligt)
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.

Ort, förlag, år, upplaga, sidor
Institutionen för fysik, kemi och biologi, 2007. s. 70
Serie
Linköping Studies in Science and Technology. Dissertations, ISSN 0345-7524 ; 1142
Nationell ämneskategori
Fysik
Identifikatorer
urn:nbn:se:liu:diva-10380 (URN)978-91-85895-50-2 (ISBN)
Disputation
2007-11-20, Planck, Fysikhuset, Campus Valla, Linköpings Universitet, Linköping, 10:15 (Engelska)
Opponent
Handledare
Tillgänglig från: 2007-12-05 Skapad: 2007-12-05 Senast uppdaterad: 2017-01-11Bibliografiskt granskad

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