Air Stability of Organic Thin-Film Transistors with Thiol-Functionalized Gold Bottom Source and Drain Contacts

IF 5.3 2区 材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY
Tobias Wollandt, Sabrina Steffens, Karla Cordero-Solano, Florian Letzkus, Joachim N. Burghartz, Hagen Klauk
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引用次数: 0

Abstract

The contact resistance and the intrinsic channel mobility of p-channel and n-channel organic thin-film transistors (TFTs) based on four different vacuum-deposited small-molecule semiconductors are monitored while the TFTs are stored in ambient air. The TFTs are fabricated in the inverted coplanar (bottom-gate, bottom-contact) device architecture, and the gold contact surface is functionalized using thiols. The initial contact resistance of all TFTs is quite small, between and 125 and 450 Ωcm, but it degrades quite rapidly over a span of 150 h, by 43% to 500%, depending on the semiconductor. Simultaneously, the intrinsic channel mobility degrades only slightly (between 11% and 50%), indicating that device degradation occurs primarily at the contact-semiconductor interface. Across all investigated parameters, DPh-DNTT is found to yield the most air-stable TFTs among the semiconductors investigated here.

Abstract Image

巯基化金底源和漏极触点有机薄膜晶体管的空气稳定性
研究了四种不同的真空沉积小分子半导体材料制备的p沟道和n沟道有机薄膜晶体管(TFTs)在空气中贮存时的接触电阻和固有沟道迁移率。tft采用倒共面(底部栅极,底部触点)器件结构制造,并使用硫醇对金接触面进行功能化。所有tft的初始接触电阻都非常小,介于125和450 Ωcm之间,但根据半导体的不同,它在150小时内降解得非常快,下降了43%到500%。同时,固有通道迁移率仅略微下降(在11%到50%之间),表明器件退化主要发生在接触-半导体界面。在所有研究的参数中,DPh-DNTT被发现在研究的半导体中产生最稳定的空气tft。
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来源期刊
Advanced Electronic Materials
Advanced Electronic Materials NANOSCIENCE & NANOTECHNOLOGYMATERIALS SCIE-MATERIALS SCIENCE, MULTIDISCIPLINARY
CiteScore
11.00
自引率
3.20%
发文量
433
期刊介绍: Advanced Electronic Materials is an interdisciplinary forum for peer-reviewed, high-quality, high-impact research in the fields of materials science, physics, and engineering of electronic and magnetic materials. It includes research on physics and physical properties of electronic and magnetic materials, spintronics, electronics, device physics and engineering, micro- and nano-electromechanical systems, and organic electronics, in addition to fundamental research.
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