Abstract
Flexible organic thin-film transistors (OTFTs) have received extensive attention due to their outstanding advantages such as light weight, low cost, flexibility, large-area fabrication, and compatibility with solution-processed techniques. However, compared with a rigid substrate, it still remains a challenge to obtain good device performance by directly depositing solution-processed organic semiconductors onto an ultrathin plastic substrate. In this work, ultrathin flexible OTFTs are successfully fabricated based on spin-coated 2,7-dioctyl[1]benzothieno[3,2-b]benzothiophene (C8-BTBT) films. The resulting device thickness is only ~320 nm, so the device has the ability to adhere well to a three-dimension curved surface. The ultrathin C8-BTBT OTFTs exhibit a mobility as high as 4.36 cm2 V−1 s−1 and an on/off current ratio of over 106. These results indicate the substantial promise of our ultrathin flexible C8-BTBT OTFTs for next-generation flexible and conformal electronic devices.
Highlights
With the booming demand of microelectronic products, portable electronics, wearable electronics, and even epidermal and bio-implanted electronics have been the emerging research fields in recent decades [1,2,3,4]
We present the realization of substrate-free flexible C8-BTBT organic thin-film transistors (OTFTs) on poly(vinyl alchol) (PVA) dielectric via a simple spin-coating method
This indicated that no obvious damage occurred to our the peeling process and adhesion, which benefitted from the ultrathin thickness. These results further ultrathin device during the peeling process and adhesion, which benefitted from the ultrathin indicate that high-performance ultrathin OTFTs show strong potential for next-generation flexible and thickness. These results further indicate that high-performance ultrathin OTFTs show strong conformal electronic devices. flexible and conformal electronic devices
Summary
With the booming demand of microelectronic products, portable electronics, wearable electronics, and even epidermal and bio-implanted electronics have been the emerging research fields in recent decades [1,2,3,4]. The field-effect performance of our obtained ultrathin flexible current ratio of the device over 10OTFT (AFM) image image of of the thin film on a Typical transfer and output characteristics the C8-BTBT thin film on a PVA dielectric layer.
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