title: CW and pulsed electrically detected magnetic resonance spectroscopy at 263GHz/12T on operating amorphous silicon solar cells.
abstract: Here we describe a new high frequency/high field continuous wave and pulsed electrically detected magnetic resonance (CW EDMR and pEDMR) setup, operating at 263GHz and resonance fields between 0 and 12T. Spin dependent transport in illuminated hydrogenated amorphous silicon p-i-n solar cells at 5K and 90K was studied by in operando 263GHz CW and pEDMR alongside complementary X-band CW EDMR. Benefiting from the superior resolution at 263GHz, we were able to better resolve EDMR signals originating from spin dependent hopping and recombination processes. 5K EDMR spectra were found to be dominated by conduction and valence band tail states involved in spin dependent hopping, with additional contributions from triplet exciton states. 90K EDMR spectra could be assigned to spin pair recombination involving conduction band tail states and dangling bonds as the dominating spin dependent transport process, with additional contributions from valence band tail and triplet exciton states.
authors.affiliation: Berlin Joint EPR Lab, Institut für Silizium-Photovoltaik, Helmholtz Zentrum Berlin für Materialien und Energie, Germany. Electronic address: mohammad.akhtar@helmholtz-berlin.de.
authors.forename: W
authors.initials: W
authors.lastname: Akhtar
authors.affiliation: Berlin Joint EPR Lab, Institut für Silizium-Photovoltaik, Helmholtz Zentrum Berlin für Materialien und Energie, Germany. Electronic address: alexander.schnegg@helmholtz-berlin.de.
authors.forename: A
authors.initials: A
authors.lastname: Schnegg
authors.affiliation: Laboratory of Magnetic Resonance, International Tomography Center SB RAS, Russia; Novosibirsk State University, Russia.
authors.forename: S
authors.initials: S
authors.lastname: Veber
authors.affiliation: Berlin Joint EPR Lab, Fachbereich Physik, Freie Universität Berlin, Germany.
authors.forename: C
authors.initials: C
authors.lastname: Meier
authors.affiliation: Berlin Joint EPR Lab, Institut für Silizium-Photovoltaik, Helmholtz Zentrum Berlin für Materialien und Energie, Germany.
authors.forename: M
authors.initials: M
authors.lastname: Fehr
authors.affiliation: Berlin Joint EPR Lab, Institut für Silizium-Photovoltaik, Helmholtz Zentrum Berlin für Materialien und Energie, Germany.
authors.forename: K
authors.initials: K
authors.lastname: Lips
keywords: Amorphous silicon; Conduction band tail; Electrically detected magnetic resonance; Solar cell; Valence band tail