Hedley, Gordon J. and Steiner, Florian and Vogelsang, Jan and Lupton, John M. (2018) Fluctuations in the Emission Polarization and Spectrum in Single Chains of a Common Conjugated Polymer for Organic Photovoltaics. SMALL, 14 (51): 1804312. ISSN 1613-6810, 1613-6829
Full text not available from this repository. (Request a copy)Abstract
Measuring the nanoscale organization of conjugated polymer chains used in organic photovoltaic (OPV) blends is vital if one wants to understand the materials. This is made very difficult with high efficiency OPV polymers such as PTB7 that form aggregates, as a lack of periodicity and a high degree of disorder make understanding of the nanoscale organization challenging. Here, single molecule spectroscopy is used to observe single chains and aggregates of PTB7. Using four detectors the photoluminescence intensity, wavelength, polarization, and lifetime are simultaneously monitored. Fast (milliseconds) and slow (seconds) fluctuations are observed over a time window of 30 s in all of these observables from single aggregates and chains as individual chromophores activate and deactivate, leading to dynamical changes in the emission spectrum and dipole orientation. This information can be used to help reconstruct the spatial and spectral organization of disordered aggregates of PTB7, thereby adding valuable new information on how the chains are arranged in space.
Item Type: | Article |
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Uncontrolled Keywords: | MOLECULE FLUORESCENCE; SPECTROSCOPY; PHOTOPHYSICS; DISORDER; LIGHT; nanoscale organization; organic semiconductors; single molecule spectroscopy; spectroscopic fluctuations |
Subjects: | 500 Science > 530 Physics |
Divisions: | Physics > Institute of Experimental and Applied Physics > Chair Professor Lupton > Group John Lupton |
Depositing User: | Dr. Gernot Deinzer |
Date Deposited: | 04 Oct 2019 09:35 |
Last Modified: | 04 Oct 2019 09:35 |
URI: | https://pred.uni-regensburg.de/id/eprint/13424 |
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