Regensburg 2016 – scientific programme
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 32: Focus: Triplet States in Organic Optoelectronics I
CPP 32.10: Talk
Wednesday, March 9, 2016, 12:30–12:45, H37
Recombination spectroscopy of organic solar cells by EDMR — Michael Eckardt1,2, René Wieczorek1,2, Frédéric Laquai3, and •Wolfgang Harneit1,2 — 1Institut für Physikalische Chemie, JGU Mainz — 2Fachbereich Physik, Universität Osnabrück — 3KAUST, Saudi Arabia
Electrically Detected Magnetic Resonance (EDMR) is used to unravel different charge carrier recombination processes in P3HT:PCBM bulk heterojunction solar cells. Specifically, the dependence of the EDMR signal due to mobile P3HT polarons on electrical bias and illumination is correlated quantitatively to both, photo- and dark current of the cell. At moderate forward bias and all the way to reverse bias, solar cell operation and EDMR are dominated by recombination of photo-generated carriers. Near open circuit, injected charges accumulate near the electrodes, leading to additional recombination that depends strongly on details of fabrication and aging. EDMR allows quantifying this loss channel, which influences fill factor and maxiumum extractable power, with high precision.