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Electronic structure dynamics in a low bandgap polymer studied by time-resolved photoelectron spectroscopy.
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2016 (English)In: Physical Chemistry, Chemical Physics - PCCP, ISSN 1463-9076, E-ISSN 1463-9084, Vol. 18, no 31, p. 21921-9Article in journal (Refereed) Published
Abstract [en]

Means to measure the temporal evolution following a photo-excitation in conjugated polymers are a key for the understanding and optimization of their function in applications such as organic solar cells. In this paper we study the electronic structure dynamics by direct pump-probe measurements of the excited electrons in such materials. Specifically, we carried out a time-resolved photoelectron spectroscopy (TRPES) study of the polymer PCPDTBT by combining an extreme ultraviolet (XUV) high harmonic generation source with a time-of-flight spectrometer. After excitation to either the 1st excited state or to a higher excited state, we follow how the electronic structure develops and relaxes on the electron binding energy scale. Specifically, we follow a less than 50 fs relaxation of the higher exited state and a 10 times slower relaxation of the 1st excited state. We corroborate the results using DFT calculations. Our study demonstrates the power of TRPES for studying photo-excited electron energetics and dynamics of solar cell materials.

Place, publisher, year, edition, pages
Royal Society of Chemistry, 2016. Vol. 18, no 31, p. 21921-9
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Physical Sciences Chemical Sciences
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URN: urn:nbn:se:kth:diva-225438DOI: 10.1039/c6cp04136aISI: 000381418000102PubMedID: 27440450Scopus ID: 2-s2.0-84981214280OAI: oai:DiVA.org:kth-225438DiVA, id: diva2:1195419
Note

QC 20180416

Available from: 2018-04-05 Created: 2018-04-05 Last updated: 2018-04-16Bibliographically approved

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