Molecular reorganization in organic field-effect transistors and its effect on two-dimensional charge transport pathways.
Molecular reorganization in organic field-effect transistors and its effect on two-dimensional charge transport pathways.
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DOI：
10.1021/nn304733w
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发表时间：
2013-02
期刊：
影响因子：
17.1
通讯作者：
F. Liscio;C. Albonetti;K. Broch;Arian Shehu;S. Quiroga;Laura Ferlauto;C. Frank;S. Kowarik;Roberto Nervo;A. Gerlach;S. Milita;F. Schreiber;F. Biscarini
中科院分区：
文献类型：
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作者：
F. Liscio;C. Albonetti;K. Broch;Arian Shehu;S. Quiroga;Laura Ferlauto;C. Frank;S. Kowarik;Roberto Nervo;A. Gerlach;S. Milita;F. Schreiber;F. Biscarini
有机薄膜晶体管中的电荷传输发生在与栅极电介质接触的前几个分子层中。在这里，我们证明了这些器件中的电荷传输途径对第一单层的取向缺陷极其敏感，这些缺陷源于特定的生长条件。虽然这些缺陷在生长过程中部分愈合，但它们导致第一单层中的电荷载流子耗尽，并驱动电流在第一单层上方的单层中流动。此外，残余缺陷导致较低的晶体有序性和电荷迁移率。这些结果，这是不直观地解释了静电参数，已获得通过结合在原位真实的时间结构和电学特性与非原位AFM测量，在相关的n型有机半导体，N，N '-双（正辛基）-二氰基-3，4：9，10-双二甲酰亚胺升华生长在一个准层的模式在不同的衬底温度下的薄膜。
Charge transport in organic thin film transistors takes place in the first few molecular layers in contact with the gate dielectric. Here we demonstrate that the charge transport pathways in these devices are extremely sensitive to the orientational defects of the first monolayers, which arise from specific growth conditions. Although these defects partially heal during the growth, they cause depletion of charge carriers in the first monolayer, and drive the current to flow in the monolayers above the first one. Moreover, the residual defects induce lower crystalline order and charge mobility. These results, which are not intuitively explained by electrostatics arguments, have been obtained by combining in situ real time structural and electrical characterization together with ex situ AFM measurements, on thin films of a relevant n-type organic semiconductor, N,N'-bis(n-octyl)-dicyanoperylene-3,4:9,10-bis dicarboximide grown by sublimation in a quasi-layer-by-layer mode at different substrate temperatures.