Work

Efficiency of Exciton and Charge Carrier Photogeneration in a Semiconducting Polymer

Year: 2004

Type: article

Abstract: We determine the efficiencies for the formation of excitons and charge carriers following ultrafast photoexcitation of a semiconducting polymer (MEH-PPV). The simultaneous, quantitative determination of exciton and charge photoyields is achieved through subpicosecond studies of both the real and the imaginary components of the complex conductivity over a wide frequency range. Predominantly excitons, with near-unity quantum efficiency, are generated on excitation, while only a very small fraction (<10(-2)) of free charges are initially excited, consistent with rapid ( approximately 100 fs) hot exciton dissociation. These initial charges are very short lived, decaying on subpicosecond time scales.

Source: Physical Review Letters

DOI: 10.1103/physrevlett.92.196601

Authors: E. Hendry, J. M. Schins, L. P. Candeias, L. D. A. Siebbeles, M. Bonn

Institutions: Leiden University, Delft University of Technology, Institute for Atomic and Molecular Physics

Language: English

Topic: Organic Electronics and Photovoltaics

Subfield: Electrical and Electronic Engineering

Field: Engineering

Domain: Physical Sciences

Open Access status: green

Funder: Nederlandse Organisatie voor Wetenschappelijk Onderzoek

Awards: Ultrafast studies of chemical reactions at surfaces, Ultrafast dynamics of excitons and charge carriers in functional materials