Organic semiconductors

Abstract

A semiconducting compound comprises the structure: where X1and X2are independently S, Se, Si, R1R2, O, CR3, N, NR4, where R1to R4independently comprise hydrogen, straight, branched or cyclic alkyl, akenyl or alkynyl groups, preferably having 1 to 20 carbons, alkoxy, aryl, silyl or amino; where each of Ar1to Ar4is optional and independently comprises, if present, an aryl or heteroaryl group; and where Y1to Y4independently comprise hydrogen, reactive groups, optionally substituted straight, branched or cyclic alkyl, alkoxy, akenyl, alkynyl, amido or amino groups, preferably having 1 to 20 carbon atoms, optionally substantial aryl or heteroaryl where at least one of Y1to Y4does not comprise hydrogen. Also shown is an electronic device having an organic semiconductor portion e.g. a thin film transistor, and method of manufacturing an electronic device by applying a solution of semiconducting compound.

Description

technical field [0001] The present invention relates generally to organic semiconductors, and more particularly to organic semiconductors used to form part of thin film transistors. Background technique [0002] Transistors can be divided into two main types: bipolar junction transistors and field effect transistors. Both types have a common structure comprising three electrodes with a semiconductor material disposed between them in the channel region. The three electrodes of a bipolar junction transistor are called emitter, collector, and base, while in field effect transistors, the three electrodes are called source, drain, and gate. Since the current between the emitter and collector is controlled by the current flowing between the base and emitter, bipolar junction transistors can be described as current-operated devices. In contrast, field effect transistors can be described as voltage-operated devices since the current flowing between source and drain is controlled b...

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Problems solved by technology

[0028] However, the increased conjugation levels required to enable compounds to form such π-π stacking can also lead to a reduction in the bandgap and stability of the semiconductor, leading to poor performance and short lifetimes.

[0029] Furthermore, due to the molecular sizes required to obtain a wide range of conjugations, these compounds can be highly insoluble, which poses particular problems for synthesis and makes them difficult to use in efficient transistor production methods such as inkjet printing.

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