Journal
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
Volume 18, Issue 31, Pages 21921-21929Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c6cp04136a
Keywords
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Funding
- Knut and Alice Wallenberg foundation (KAW)
- VINNOVA in Sweden
- Swedish Research Council (VR)
- European Research Council under the European Union [321319]
- Carl Tryggers foundation
- Swedish Energy agency
- Swedish Research Council FORMAS
- AForsk
- KAW
- Goran Gustafsson Foundation
- European Research Council (ERC) [321319] Funding Source: European Research Council (ERC)
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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.
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