NDLI: Key Issues With Printed Flexible Thin Film Transistors and Their Application in Disposable RF Sensors

Content Provider	IEEE Xplore Digital Library
Author	Jinsoo Noh Minhoon Jung Younsu Jung Chisun Yeom Myungho Pyo Gyoujin Cho
Copyright Year	1963
Abstract	This paper addresses the key issues that must be overcome to realize fully printed TFT-based flexible devices via commercially viable methods. In particular the threshold voltage (V_th) variation in printed TFTs is a serious impediment to the successful launch of fully printed TFT-based devices in the market. The underlying causes of the V_th variation in fully printed TFTs were analyzed by considering the misalignment of printed drain-source to gate electrodes, the rheology of electronic inks and effects from external sources of charge. By alleviating the influences of external sources of charge using a printed passivation layer, V_th variation is maintained below 30% using a fully printed process. Based on the attainable variation range, the required number of integrated TFTs was estimated to fabricate a fully printed TFT-based radio frequency (RF) sensor device. A practical compromise enables fully printed RF sensors to be realized via the scalability of printing processes that mitigate V_th variation by minimizing the level of TFT integration. Prototypes of fully printed RF sensors with human interactive capability-an RF sensor label, and an RF e-sensor (cyclic voltammetry) tag-are enabled with as few as 26 printed TFTs, demonstrating that low-cost and high throughput manufacturing of printed electronics is feasible.
Sponsorship	IEEE Publication
Starting Page	554
Ending Page	566
Page Count	13
File Size	2195847
File Format	PDF
ISSN	00189219
Volume Number	103
Issue Number	4
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2015-01-01
Publisher Place	U.S.A.
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Thin film transistors Printed circuits Radio frequency Flexible electronics Electrodes Sensors Logic gates Radio frequency sensors printed thin film transistor Printed electronics printed radio frequency (RF) $e$-sensors printed radio frequency sensors
Content Type	Text
Resource Type	Article
Subject	Computer Science Electrical and Electronic Engineering

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4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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