Mechanism for Oxygen-Enhanced Photoconductivity in Rubrene: Electron Transfer Doping

被引：32

作者：

Maliakal, Ashok J. ^{[1
]}

Chen, Judy Y. -C. ^{[2
]}

So, Woo-Young ^{[3
]}

Jockusch, Steffen ^{[2
]}

Kim, Bumjung ^{[2
]}

Ottaviani, Maria Francesca ^{[4
]}

Modelli, Alberto ^{[5
,6
]}

Turro, Nicholas J. ^{[2
]}

Nuckolls, Colin ^{[2
]}

Ramirez, Arthur P. ^{[1
]}

机构：

[1] LGS Innovat, Florham Pk, NJ 07932 USA

[2] Columbia Univ, Dept Chem, New York, NY 10027 USA

[3] Columbia Univ, Dept Appl Phys, New York, NY 10027 USA

[4] Univ Urbino, Inst Chem Sci, I-61029 Urbino, Italy

[5] Univ Bologna, Dept Chem, I-40126 Bologna, Italy

[6] CIRSA, I-48100 Ravenna, Italy

来源：

CHEMISTRY OF MATERIALS | 2009年 / 21卷 / 22期

关键词：

ORGANIC SEMICONDUCTORS; SUPEROXIDE ANION; CHARGE-TRANSPORT; SURFACE; PARAMETERS; PENTACENE; DIFFUSION; GROWTH; ESR;

D O I：

10.1021/cm902699s

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

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.

引用

页码：5519 / 5526

页数：8

共 45 条

[1] Interaction of oxygen with conjugated polymers: Charge transfer complex formation with poly(3-alkylthiophenes) [J].