Direct observation and measurement of mobile charge carriers in a monolayer organic semiconductor on a dielectric substrate.
Direct observation and measurement of mobile charge carriers in a monolayer organic semiconductor on a dielectric substrate.
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DOI：
10.1021/nn200760r
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发表时间：
2011-07
期刊：
影响因子：
17.1
通讯作者：
Ye-Ping Jiang;Q. Qi;Rui Wang;Jun Zhang;Q. Xue;C. Wang;Chao Jiang;X. Qiu
中科院分区：
文献类型：
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作者：
Ye-Ping Jiang;Q. Qi;Rui Wang;Jun Zhang;Q. Xue;C. Wang;Chao Jiang;X. Qiu
我们报告了生长在电介质表面的单层有机半导体的电学特性。利用电显微镜（EFM）探针与不同大小的并五烯岛之间的静电相互作用，表征了并五烯单层膜中载流子的动态响应。这些岛屿是通过将粘合的五苯单层分割成分离的区域而在原位形成的。并五苯岛的介电响应与大小有关，表明在有机单层中存在可移动电荷。局部电容谱分析表明，在高偏置电压下，p型并五苯单层中的载流子可以被耗尽，从而可以进一步确定有机半导体超薄膜中的载流子浓度。
We report the electrical characterization of a single layer of an organic semiconductor grown on a dielectric surface. The dynamic response of the charge carriers in the monolayer film of pentacene was characterized through the electrostatic interactions between an electric force microscope (EFM) probe and pentacene islands of various sizes. These islands were formed in situ by segmenting a coalesced pentacene monolayer into separated regions. The size-dependent dielectric responses of the pentacene islands suggest that mobile charges exist in the organic monolayer. Local capacitance spectroscopy revealed that the charge carriers in the p-type pentacene monolayer could be depleted at high bias voltages, enabling a further determination of the charge-carrier concentration in the organic semiconductor ultrathin film.