Local charge trapping in conjugated polymers resolved by scanning Kelvin probe microscopy.
Local charge trapping in conjugated polymers resolved by scanning Kelvin probe microscopy.
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DOI：
10.1103/physrevlett.103.256803
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发表时间：
2009-12
影响因子：
8.6
通讯作者：
T. Hallam;Mijung Lee;Ni Zhao;I. Nandhakumar;M. Kemerink;M. Heeney;I. McCulloch;H. Sirringhaus
中科院分区：
文献类型：
--
作者：
T. Hallam;Mijung Lee;Ni Zhao;I. Nandhakumar;M. Kemerink;M. Heeney;I. McCulloch;H. Sirringhaus
共轭聚合物的微观结构在单个高分子链的长度尺度上是不均匀的，但人们对这如何影响它们的电子性质知之甚少。在这里，我们使用扫描开尔文探针显微镜和分辨率增强的碳纳米管尖端来研究100纳米尺度上的电荷在链延伸的半结晶共轭聚合物中的传输。结果表明，晶区间的无序晶界构成了择优的电荷俘获位置，并在积聚条件下导致载流子浓度在100 nm尺度上的变化。
The microstructure of conjugated polymers is heterogeneous on the length scale of individual polymer chains, but little is known about how this affects their electronic properties. Here we use scanning Kelvin probe microscopy with resolution-enhancing carbon nanotube tips to study charge transport on a 100 nm scale in a chain-extended, semicrystalline conjugated polymer. We show that the disordered grain boundaries between crystalline domains constitute preferential charge trapping sites and lead to variations on a 100 nm scale of the carrier concentration under accumulation conditions.