Molecular Engineering of Organic Semiconductors
Molecular Engineering of Organic Semiconductors
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有机半导体分子工程
DOI：
10.1007/978-94-017-1952-0_10
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发表时间：
1993
期刊：
影响因子：
--
通讯作者：
R. Hajlaoui
中科院分区：
文献类型：
--
作者：
F. Garnier;F. Deloffre;A. Yassar;G. Horowitz;R. Hajlaoui
在基于这些有机半导体的场效应晶体管上测量了一系列未取代、α烷基取代和β烷基取代的噻吩低聚物的载流子迁移率μ fet。随着共轭长度的增加，μ fet随共轭长度的增加而急剧上升。对于给定的长度，在一个位置上的烷基取代导致迁移率进一步显著增加，在α，ω二己基性噻吩的情况下，迁移率达到接近1 cm2V−1s−1的值。x射线数据显示，这些重要的数值表明分子间电荷转移效率高，这是由于这些分子的薄膜呈现出多结晶性和长范围结构有序。这种结构组织高度依赖于低聚物的烷基取代性质，从而允许其半导体性质的分子工程。在微型器件上进行场效应管的表征，在具有交互矩阵的平板显示和数字器件领域开辟了各种应用。
The carrier mobility μFETof a series of unsubstituted, α alkyl susbtituted and β alkyl susbtituted thiophene oligomersnThas been measured on field-effect transistors based on these organic semiconductors. A steep rise of μFETwith conjugation lengthnhas been observed up to the hexamer6T. For a given lengthn, alkyl substitution in a position leads to a further important increase of mobility, which reaches values close o 1 cm2V−1s−1in the case of α,ω dihexyl sexithiophene. These important values, which express high efficiency in intermolecular charge transfer, are attributed to polycrystallinity and long range structural ordering, which appear in thin films of these molecules, as shown by X-ray data. This structural organization is highly dependent on the nature of alkyl substitution of the oligomers, thus allowing a molecular engineering of their semiconducting properties. FET characterizations on micro-scaled devices open various applications in the fields of flat panel display with interactive matrices, and also of digital devices.