Direct determination of the exciton binding energy of conjugated polymers using a scanning tunneling microscope

被引：267

作者：

Alvarado, SF ^{[1
]}

Seidler, PF

Lidzey, DG

Bradley, DDC

机构：

[1] IBM Corp, Div Res, Zurich Res Lab, CH-8803 Ruschlikon, Switzerland

[2] Univ Sheffield, Dept Phys, Sheffield S3 7RH, S Yorkshire, England

来源：

PHYSICAL REVIEW LETTERS | 1998年 / 81卷 / 05期

关键词：

D O I：

10.1103/PhysRevLett.81.1082

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We report scanning tunneling spectroscopy measurements of the threshold energy for injecting electrons or holes into thin, conjugated polymer films deposited on Au(111) substrates. Combining these results with optical absorption measurements, we estimate an exciton binding energy of E-b = 0.36 +/- 0.10 eV for poly[(2-methoxy-5-dodecyloxy)-1,4-phenylenevinylene-co-1,4-phenylenevinylene] and E-b = 0.30 +/- 0.10 eV for poly(9,9'-dioctylfluorene). In addition, we determine the alignment of the electronic levels of the polymers relative to the substrate.

引用

页码：1082 / 1085

页数：4

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