Band Bending in Conjugated Polymer Layers

被引：191

作者：

Lange, Ilja ^{[1
]}

Blakesley, James C. ^{[1
]}

Frisch, Johannes ^{[2
]}

Vollmer, Antje ^{[3
]}

Koch, Norbert ^{[2
,3
]}

Neher, Dieter ^{[1
]}

机构：

[1] Univ Potsdam, Inst Phys & Astron, D-14476 Potsdam, Germany

[2] Humboldt Univ, Inst Phys, D-12489 Berlin, Germany

[3] Helmholtz Zentrum Mat & Energie GmbH, BESSY II, D-12489 Berlin, Germany

来源：

PHYSICAL REVIEW LETTERS | 2011年 / 106卷 / 21期

关键词：

LEVEL ALIGNMENT; INTERFACES; TRANSPORT; MOBILITY; ORGANIC/METAL; TRANSISTORS; COPOLYMERS; FLUORENE;

D O I：

10.1103/PhysRevLett.106.216402

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We use the Kelvin probe method to study the energy-level alignment of four conjugated polymers deposited on various electrodes. Band bending is observed in all polymers when the substrate work function exceeds critical values. Through modeling, we show that the band bending is explained by charge transfer from the electrodes into a small density of states that extends several hundred meV into the band gap. The energetic spread of these states is correlated with charge-carrier mobilities, suggesting that the same states also govern charge transport in the bulk of these polymers.

引用

页数：4

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