Confined and delocalized polarons in π-conjugated oligomers and polymers:: A study of the effective conjugation length -: art. no. 241204

被引：79
|
作者：
Wohlgenannt, M [1 ]
Jiang, XM
Vardeny, ZV
机构：
[1] Univ Iowa, Dept Phys & Astron, Iowa City, IA 52242 USA
[2] Univ Utah, Dept Phys, Salt Lake City, UT 84112 USA
来源：
PHYSICAL REVIEW B | 2004年 / 69卷 / 24期
关键词：
D O I：
10.1103/PhysRevB.69.241204
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
We studied optical absorption of polarons in pi-conjugated oligomers and polymers using the photoinduced absorption technique as well as chemical doping spectra from the literature. We find that the photon energy of the polaron low-energy transition obeys a relationship that depends only on the oligomer-length in a wide class of unsubstituted and substituted oligomer solutions and films. Based on this observation, we show that polarons in polymer films can be either confined as in oligomers or quite delocalized, depending on the individual pi-conjugated semiconductor. In high mobility polymer films polarons may be delocalized over several chains.
引用
收藏
页码：241204 / 1
页数：4
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