Department of Electrical and Computer Engineering (ECE), Inter-university Semiconductor Research Center (ISRC), Seoul National University , Seoul 08826, Republic of Korea.
Department of Physics and Astronomy, Seoul National University , Seoul 08826, Republic of Korea.
ACS Appl Mater Interfaces. 2017 Mar 15;9(10):8819-8829. doi: 10.1021/acsami.6b14702. Epub 2017 Mar 1.
We report a one-step interface engineering methodology which can be used on both polymer electrodes and gate dielectric for all-inkjet-printed, flexible, transparent organic thin-film transistors (OTFTs) and inverters. Dimethylchlorosilane-terminated polystyrene (PS) was introduced as a surface modifier to cured poly(4-vinylphenol) dielectric and poly(3,4-ethylenedioxythiophene):polystyrenesulfonate (PEDOT:PSS) electrodes without any pretreatment. On the untreated and PS interlayer-treated dielectric and electrode surfaces, 6,13-bis(triisopropylsilylethynyl)pentacene was printed to fabricate OTFTs and inverters. With the benefit of the PS interlayer, the electrical properties of the OTFTs on a flexible plastic substrate were significantly improved, as shown by a field-effect mobility (μ) of 0.27 cm V s and an on/off current ratio (I/I) of greater than 10. In contrast, the untreated systems showed a low μ of less than 0.02 cm V s and I/I ∼ 10. Additionally, the all-inkjet-printed inverters based on the PS-modified surfaces exhibited a voltage gain of 7.17 V V. The all-organic-based TFTs and inverters, including deformable and transparent PEDOT:PSS electrodes with a sheet resistance of 160-250 Ω sq, exhibited a light transmittance of higher than 70% (at wavelength of 550 nm). Specifically, there was no significant degradation in the electrical performance of the interface engineering-assisted system after 1000 bending cycles at a radius of 5 mm.
我们报告了一种一步式界面工程方法，可用于全喷墨打印、柔性、透明有机薄膜晶体管（OTFT）和逆变器的聚合物电极和栅介质。用二甲基氯硅烷封端的聚苯乙烯（PS）作为表面改性剂，无需任何预处理，就可用于固化的聚（4-乙烯基苯酚）电介质和聚（3,4-乙撑二氧噻吩）：聚苯乙烯磺酸盐（PEDOT：PSS）电极。在未经处理和 PS 层处理的电介质和电极表面上，打印了 6,13-双（三异丙基硅基乙炔基）并五苯，以制造 OTFT 和逆变器。得益于 PS 层，柔性塑料衬底上的 OTFT 的电性能得到了显著改善，场效应迁移率（μ）为 0.27 cm V s，导通/关断电流比（I/I）大于 10。相比之下，未经处理的系统显示出小于 0.02 cm V s 的低 μ 和 I/I ∼ 10。此外，基于 PS 改性表面的全喷墨打印逆变器表现出 7.17 V V 的电压增益。包括具有 160-250 Ω/sq 片电阻的可变形和透明 PEDOT：PSS 电极的全有机 TFT 和逆变器，透光率高于 70%（在 550nm 波长处）。具体而言，在半径为 5mm 的情况下进行 1000 次弯曲循环后，界面工程辅助系统的电性能没有明显下降。
