Oxygen-related band gap state in single crystal rubrene

被引：107

作者：

Mitrofanov, Oleg ^{[1
]}

Lang, David V.

Kloc, Christian

Wikberg, J. Magnus

Siegrist, Theo

So, Woo-Young

Sergent, M. A.

Ramirez, Arthur P.

机构：

[1] Bell Labs, Lucent Technol, Murray Hill, NJ 07974 USA

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

来源：

PHYSICAL REVIEW LETTERS | 2006年 / 97卷 / 16期

关键词：

D O I：

10.1103/PhysRevLett.97.166601

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

A molecular exciton signature is established and investigated under different ambient conditions in rubrene single crystals. An oxygen-related band gap state is found to form in the ambient atmosphere. This state acts as an acceptor center and assists in the fast dissociation of excitons, resulting in a higher dark and photoconductivity of oxidized rubrene. The band gap state produces a well-defined photoluminescence band at an energy 0.25 eV below the energy of the 0-0 molecular exciton transition. Two-photon excitation spectroscopy shows that the states are concentrated near the surface of naturally oxidized rubrene.

引用

页数：4

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