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n-Doping of organic semiconductors for enhanced electron extraction from solution processed solar cells using alkali metals

Schneider, Tanja; Czolk, Jens; Landerer, Dominik; Gärtner, Stefan; Puetz, Andreas; Bruns, Michael; Behrends, Jan; Colsmann, Alexander

Abstract (englisch):
To improve charge carrier injection into or extraction from organic optoelectronic devices, electrically doped layers are often employed. Whereas n-doping of organic semiconductors has been widely used in vacuum processed optoelectronic devices, adequate solution processes to enable future device printing are underdeveloped. In this work, we study n-doping of 1,3,5-tris(1-phenyl-1H-benzimidazol-2-yl)benzene (TPBi) in a solution process, using sodium as the electron donor. Upon addition of elementary sodium to a clear TPBi/toluene solution, we observed a change in color, indicating charge carrier transfer between sodium and TPBi. The optical and electrical properties of doped and undoped TPBi were characterized in solution and in the corresponding thin-films. Electron Paramagnetic Resonance (EPR) measurements revealed an increase of the number of unpaired spins upon doping, indicating the presence of doping-induced charge carriers. Implementing TPBi:Na as electron extraction layers in organic solar cells, we found almost the same device performance as compared to state-of-the-art solar cells comprising zinc oxide electron extraction layers.

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DOI: 10.5445/IR/1000060430
DOI: 10.1039/c6ta04770j
Zitationen: 4
Web of Science
Zitationen: 4
Zitationen: 5
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Angewandte Materialien - Energiespeichersysteme (IAM-ESS)
Karlsruhe Nano Micro Facility (KNMF)
Lichttechnisches Institut (LTI)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2016
Sprache Englisch
Identifikator ISSN: 2050-7488
KITopen-ID: 1000060430
HGF-Programm 49.02.06 (POF III, LK 02) ToF-SIMS
Erschienen in Journal of materials chemistry / A
Verlag Royal Society of Chemistry (RSC)
Band 4
Heft 38
Seiten 14703-14708
Bemerkung zur Veröffentlichung RSC geförderter Open Access-Artikel
Nachgewiesen in Dimensions
Web of Science
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