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Triplet excitons as sensitive spin probes for structure analysis of extended defects in microcrystalline silicon
Meier, Christoph ;  Teutloff, Christian ;  Behrends, Jan ;  Bittl, Robert ;  Astakhov, Oleksandr ;  Lips, Klaus

HaupttitelTriplet excitons as sensitive spin probes for structure analysis of extended defects in microcrystalline silicon
AutorMeier, Christoph
AutorTeutloff, Christian
AutorBehrends, Jan
AutorBittl, Robert
AutorAstakhov, Oleksandr
AutorLips, Klaus
Seitenzahl13 Seiten
DDC530 Physik
Auch erschienen inPhysical Review B. - 94 (2016), 4, Artikel Nr. 045302
ZusammenfassungElectrically detected magnetic resonance (EDMR) spectroscopy is employed to study the influence of triplet excitons on the photocurrent in state-of-the-art microcrystalline silicon thin-film solar cells. These triplet excitons are used as sensitive spin probes for the investigation of their electronic and nuclear environment in this mixed-phase material. According to low-temperature EDMR results obtained from solar cells with different 29Si isotope concentrations between 0.01% and 50%, the triplet excitons reside at extended defects in the crystallites of microcrystalline silicon that give rise to shallow states in the silicon band gap. The excitons possess a rather delocalized wave function, couple to electron spins in conduction band tail states nearby, and take part in a spin-dependent recombination process. Our study shows that extended defects such as grain boundaries or stacking faults in the crystalline part of the material act as charge carrier traps that can influence the material conductivity.
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Fachbereich/EinrichtungFB Physik
Arbeitsbereich/InstitutInstitut für Experimentalphysik
Erscheinungsjahr2016
Dokumententyp/-SammlungenWissenschaftlicher Artikel
SpracheEnglisch
RechteCopyright des Verlags
Erstellt am01.03.2017 - 00:00:00
Letzte Änderung01.03.2017 - 00:00:00
 
Statische URLhttp://edocs.fu-berlin.de/docs/receive/FUDOCS_document_000000026496
SEPID55484
ISSN2469-9950
DOI10.1103/PhysRevB.94.045302
Zugriffsstatistik
 

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