The role of electron photoemission in the 'photoconductivity' of semiconducting polymers

被引：31

作者：

Moses, D ^{[1
]}

Soci, C ^{[1
]}

Miranda, P ^{[1
]}

Heeger, AJ ^{[1
]}

机构：

[1] Univ Calif Santa Barbara, Inst Polymers & Organ Solids, Santa Barbara, CA 93103 USA

来源：

CHEMICAL PHYSICS LETTERS | 2001年 / 350卷 / 5-6期

基金：

美国国家科学基金会;

关键词：

D O I：

10.1016/S0009-2614(01)01317-3

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：

We present the excitation profile of the transient and steady-state photoconductivity of poly(phenylene vinylene) and its soluble derivatives over a wide spectral range up to hv = 6.2 eV. An apparent increase in the 'photoconductivity' at hv > 3-4 eV arises from external current generated by electron photoemission (PE). After quenching the PE by adding a gas mixture of CO2 + SF6 (90%:10%) into the sample chamber, the bulk photoconductivity is nearly independent of photon energy in all polymers studied. The single threshold for photoconductivity is spectrally close to the onset of pi-pi* absorption, a behavior that is inconsistent with a large exciton binding energy. (C) 2001 Elsevier Science B.V. All rights reserved.

引用

页码：531 / 536

页数：6

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