Photo-induced charge separation process in (PCBM-C120O)/(M3EH-PPV) blend solid film studied by means of X and K-bands ESR at 77 and 120 K |
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| Authors: | A Konkin U Ritter P Scharff H-K Roth A Aganov NS Sariciftci DAM Egbe |
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| Affiliation: | 1. Ilmenau Technical University, Institute for Physics, Weimarer Str.32, D-98684 Ilmenau, Germany;2. Ilmenau Technical University, Center for Micro- and Nanotechnologies, Gustav-Kirchhoff-Str.7, D-98693 Ilmenau, Germany;3. Thuringian Institute for Textile and Plastics Research, Breitscheidstr. 97, 07407 Rudolstadt, Germany;4. Kazan State University, Physical Department, Kremljevskaja 18, Kazan, Russia;5. Linz Institute for Organic Solar Cells, Johannes Kepler University Linz, Altenbergerstrasse 69, 4040 Linz, Austria |
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| Abstract: | The new fullerene dimer adduct PCBM-C120O was studied as an electron acceptor by light-induced ESR (LESR) when blended with the electron donor-conjugated polymer M3EH-PPV in a thin solid film. ESR parameters for the PCBM-C120O anion radical and the M3EH-PPV polaron (triaxial gx,y,z factors) were determined by X- and K-band ESR techniques at temperatures of 77 and 120 K. It was found that isotropic g0 of PCBM-C120O anion radical ESR spectra obtained in this blend under illumination is close to g-factors of electrochemically reduced (C120-O)? and does not coincide with the analogous parameter of (C120-O)2? (reported in literature). Spin relaxation parameters (T1 and T2) of the PCBM-C120O anion radical and M3EH-PPV positive polaron are similar to T1, T2 for light-induced ion radicals in the P3HT/PCBM blend. |
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