Electronic functionalization of the surface of organic semiconductors with self-assembled monolayers
Electronic functionalization of the surface of organic semiconductors with self-assembled monolayers
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DOI：
10.1038/nmat2059
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发表时间：
2008-01-01
期刊：
影响因子：
41.2
通讯作者：
Podzorov, V.
中科院分区：
文献类型：
--
作者：
Calhoun, M. F.;Sanchez, J.;Podzorov, V.
自组装单层膜（SAMs）广泛应用于金属和氧化物的表面改性。在这里，我们展示了一种新型的分子自组装：有机硅烷SAMs在有机半导体表面的生长。值得注意的是，SAM的生长导致有机材料表面电导率的显著增加，对于具有强电子吸出能力的SAM来说，电导率可能非常大。例如，有机分子晶体中全氟烷基硅烷诱导的电导率接近每平方10(-5)S，比有机场效应晶体管中通常达到的最大电导率高出两个数量级。观察到的大电子效应为有机半导体分子自组装的纳米级表面功能化开辟了新的机会。特别是，sam诱导的电导率显示出对环境中存在的不同分子种类的敏感性，这使得该系统对化学传感应用非常有吸引力。
Self-assembled monolayers (SAMs) are widely used in a variety of emerging applications for surface modification of metals and oxides. Here, we demonstrate a new type of molecular self-assembly: the growth of organosilane SAMs at the surface of organic semiconductors. Remarkably, SAM growth results in a pronounced increase of the surface conductivity of organic materials, which can be very large for SAMs with a strong electron-withdrawing ability. For example, the conductivity induced by perfluorinated alkyl silanes in organic molecular crystals approaches 10(-5) S per square, two orders of magnitude greater than the maximum conductivity typically achieved in organic field-effect transistors. The observed large electronic effect opens new opportunities for nanoscale surface functionalization of organic semiconductors with molecular self-assembly. In particular, SAM-induced conductivity shows sensitivity to different molecular species present in the environment, which makes this system very attractive for chemical sensing applications.