CW and pulsed electrically detected magnetic resonance spectroscopy at 263GHz/12T on operating amorphous silicon solar cells.

Autor: Akhtar W; Berlin Joint EPR Lab, Institut für Silizium-Photovoltaik, Helmholtz Zentrum Berlin für Materialien und Energie, Germany. Electronic address: mohammad.akhtar@helmholtz-berlin.de., Schnegg A; Berlin Joint EPR Lab, Institut für Silizium-Photovoltaik, Helmholtz Zentrum Berlin für Materialien und Energie, Germany. Electronic address: alexander.schnegg@helmholtz-berlin.de., Veber S; Laboratory of Magnetic Resonance, International Tomography Center SB RAS, Russia; Novosibirsk State University, Russia., Meier C; Berlin Joint EPR Lab, Fachbereich Physik, Freie Universität Berlin, Germany., Fehr M; Berlin Joint EPR Lab, Institut für Silizium-Photovoltaik, Helmholtz Zentrum Berlin für Materialien und Energie, Germany., Lips K; Berlin Joint EPR Lab, Institut für Silizium-Photovoltaik, Helmholtz Zentrum Berlin für Materialien und Energie, Germany.
Jazyk: angličtina
Zdroj: Journal of magnetic resonance (San Diego, Calif. : 1997) [J Magn Reson] 2015 Aug; Vol. 257, pp. 94-101. Date of Electronic Publication: 2015 Jun 11.
DOI: 10.1016/j.jmr.2015.05.012
Abstrakt: 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.
(Copyright © 2015 Elsevier Inc. All rights reserved.)
Databáze: MEDLINE
Externí odkaz: