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Photogenerated Charge Transport in Organic Electronic Materials: Experiments Confirmed by Simulations
Stanford Univ, CA 94305 USA.
Linköping University, Department of Physics, Chemistry and Biology, Complex Materials and Devices. Linköping University, Faculty of Science & Engineering.ORCID iD: 0000-0002-7104-7127
2019 (English)In: Advanced Materials, ISSN 0935-9648, E-ISSN 1521-4095, Vol. 31, no 22, article id 1806004Article, review/survey (Refereed) Published
Abstract [en]

The performance of organic optoelectronic devices, such as organic photovoltaic (OPV) cells, is to a large extent dictated by their ability to transport the photogenerated charge, with relevant processes spanning a wide temporal (fs-mu s) and spatial (1-100 nm) range. However, time-resolved techniques can access only a limited temporal window, and often contradict steady-state measurements. Here, commonly employed steady-state and time-resolved techniques are unified over an exceptionally wide temporal range (fs-mu s) in a consistent physical picture. Experimental evidence confirmed by numerical simulations shows that, although various techniques probe different time scales, they are mutually consistent as they probe the same physical mechanisms governing charge motion in disordered media-carrier hopping and thermalization in a disorder-broadened density of states (DOS). The generality of this framework is highlighted by time-resolved experimental data obtained on polymer:fullerene, polymer:polymer, and small-molecule blends with varying morphology, including recent experiments revealing that low donor content OPV devices operate by long-range hole tunneling between non-nearest-neighbor molecules. The importance of nonequilibrium processes in organic electronic materials is reviewed, with a particular focus on experimental data and understanding charge transport physics in terms of material DOS.

Place, publisher, year, edition, pages
WILEY-V C H VERLAG GMBH , 2019. Vol. 31, no 22, article id 1806004
Keywords [en]
charge carrier mobility; kinetic Monte Carlo simulations; nonequilibrium phenomena; organic solar cells; thermalization
National Category
Condensed Matter Physics
Identifiers
URN: urn:nbn:se:liu:diva-159288DOI: 10.1002/adma.201806004ISI: 000475696300003PubMedID: 30719756OAI: oai:DiVA.org:liu-159288DiVA, id: diva2:1341118
Note

Funding Agencies|Knut and Alice Wallenberg Foundation [KAW 2016.0494]

Available from: 2019-08-07 Created: 2019-08-07 Last updated: 2019-08-07

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