Pulsed electrically detected magnetic resonance for thin film silicon and organic solar cells

Alexander Schnegg, Jan Behrends, Matthias Fehr, Klaus Lips
2012 Physical Chemistry, Chemical Physics - PCCP  
5 In thin film solar cells based on non-crystalline thin film silicon or organic semiconductors structural disorder leads to localized states that induce device limiting charge recombination and trapping. Both processes frequently involve paramagnetic states and become spindependent. In the present perspectives article we report on advanced pulsed electrically detected magnetic resonance (pEDMR) experiments for the study of spin dependent transport processes in fully processed thin film solar
more » ... d thin film solar cells. We reflect on recent advances in pEDMR spectroscopy and demonstrate its capabilities on two different state of the art thin film solar cell concepts based on 10 microcrystalline silicon and organic MEH-PPV:PCBM blends, recently studied at HZB. Benefiting from the increased capabilities of novel pEDMR detection schemes we were able to ascertain spin-dependent transport processes and microscopically identify paramagnetic states and their role in the charge collection mechanism of solar cells.
doi:10.1039/c2cp41258f pmid:22941053 fatcat:afl5z2v6ejgd3kq4o2ixj65bny