均一な特性を有する有機トランジスタアレイ

摘要

It is generally known that the improvement of uniformity of electrical performance of printed electronic devices is a big challenge to be overcome to achieve their practical application. However, it has been hard to achieve both high electrical performance and high performance uniformity in a number of devices. Here we report on the fabrication of printed organic thin-film transistor (TFT) arrays with very uniform and high electrical performances. The organic TFTs were printed on source/drain electrodes using dithieno[2,3-d;2',3'-d']benzo[1,2-b;4,5-b']dithiophene (DTBDT-C6), as the semiconducting layer, from a semiconductor solution by using a dispensor. By controlling both the drop volume and the DTBDT-C6 solution area by the printing system, and restricting the flow of DTBDT-C6 solution by the bank and source/drain electrodes, a large single-domain crystalline with good reproducibility grew along the channels of TFTs. One hundred transistors on a plastic substrate exhibited excellent uniformities in electrical performances, as well as a high mobility of 1.9 cm~2/V·sec. The most notable result was an extraordinary small standard deviation in the threshold voltage.%本研究は、優れた電気特性、均一なデバイス性能、そして機械的柔軟性を持つプリンテツドOTFTデバイスの作製が可能であることを示した。我々は過去の研究でほとんど取り上げられることのなかった均一性に着目し、フレキシブルな基板上に印刷で作製したOTFTデバイスが充分均一な電気特性を有することを明らかにした。デバイスは特に閾値電圧とターンオン電圧の極めて均一な分布を示し、この結果は回路設計の観点から重要である。これらの結果は、プリンテツドOTFTデバイスを用いた工業的な論理回路の開発を大きく促進し、新しい用途開発を推進させると思われる。