Mechanism for Oxygen-Enhanced Photoconductivity in Rubrene: Electron Transfer Doping▽This publication involves research sponsored by the U.S. Department of Energy under grant no. DE FG02-04ER 46118 and Columbia University

Autor:	Ashok Maliakal, Arthur P. Ramirez, Judy Y.-C. Chen, Steffen Jockusch, Colin Nuckolls, Bumjung Kim, Alberto Modelli, Maria Francesca Ottaviani, Nicholas J. Turro, Woo-Young So
Rok vydání:	2009
Předmět:	Chemistry General Chemical Engineering Radical Photoconductivity Doping General Chemistry Photochemistry Acceptor law.invention Electron transfer chemistry.chemical_compound Radical ion law Materials Chemistry Rubrene Electron paramagnetic resonance
Zdroj:	Chemistry of Materials. 21:5519-5526
ISSN:	1520-5002 0897-4756
Popis:	The oxygen-enhanced photoconductivity observed in crystalline rubrene is investigated using electron paramagnetic resonance (EPR) spectroscopy and steady-state and time dependent photoconductivity (PC) measurements. The EPR data indicate the presence of rubrene radical cation and oxygen radical anion pairs formed within the crystalline structure when rubrene is irradiated in the presence of oxygen. Radical lifetimes determined using EPR spectroscopy correlate well with transient PC data and provide strong evidence that the rubrene radical cation is the charge carrier responsible for enhanced conduction. This process is reversible, although photodegradation is also observed. The oxygen-enhanced PC of rubrene is thus explained by an electron transfer mechanism that generates radical cation “hole” carriers within the crystal via the oxygen acceptor.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::9a4e8a8de598aae8baac8014ba061477 https://doi.org/10.1021/cm902699s Zobrazit plný text záznamu