Structural Odd–Even Effect Impacting the Dimensionality of Transport in BTBT-CnOH Organic Field Effect Transistors,Advanced Electronic Materials

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Structural Odd–Even Effect Impacting the Dimensionality of Transport in BTBT-CnOH Organic Field Effect Transistors
Advanced Electronic Materials ( IF 5.3 ) Pub Date : 2021-09-27 , DOI: 10.1002/aelm.202100265
Gilles H. Roche _{1,

2} , Gudrun Bruckner ₁ , Dan G. Dumitrescu ₃ , Joël J. E. Moreau ₁ , Arie Lee ₄ , Guillaume Wantz ₂ , Olivier J. Dautel ₁

Affiliation

The synthesis and characterization of a series of [1]benzothieno[3,2-b][1]benzothiophene (BTBT) molecules disubstituted by hydroxy aliphatic chains in positions 2 and 7 (BTBT-CnOH), where the intralayer molecular stacking alternates between a classical and an inverted herringbone mode as a function of whether the alkyl sides chains have an even or an odd number of carbon atoms are reported. This odd–even effect does not only affect the interlayer distance of the lamellar structures and the melting points, but also the electronic properties. The BTBT-CnOH odd series develops a classical herringbone pattern with edge-to-edge S⋯S interaction chains linked together by face-to-edge S⋯S interaction chains with 2D mobility. However, the even series has only edge-to-edge interactions in an inverted herringbone organization and thus only a 1D conducting character. These two types of herringbone patterns have different field effect transistor characteristics and mobilities, those of the odd members being systematically higher than their even neighbors. This is the first example of an odd–even effect impacting the electronic properties of an organic semiconductor.

中文翻译：

影响 BTBT-CnOH 有机场效应晶体管中传输维数的结构奇偶效应

一系列[1]苯并噻吩[3,2- b ][1]苯并噻吩（BTBT）分子在2位和7位被羟基脂肪链二取代（BTBT-C n OH）的合成和表征，其中层内分子堆积根据报告的烷基侧链是否具有偶数或奇数个碳原子，在经典和倒置人字形模式之间交替。这种奇偶效应不仅会影响层状结构的层间距离和熔点，还会影响电子特性。的BTBT-C Ñ OH奇数系列开发了一种经典的人字形图案，边缘到边缘的 S⋯S 相互作用链通过具有 2D 移动性的面对面 S⋯S 相互作用链连接在一起。然而，偶数系列在倒置的人字形组织中仅具有边缘到边缘的相互作用，因此只有一维传导特征。这两种人字形图案具有不同的场效应晶体管特性和迁移率，奇数成员的系统性地高于其偶数邻居。这是影响有机半导体电子特性的奇偶效应的第一个例子。

更新日期：2021-09-27

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