Sensors based on organic thin film transistors

Feng Yan, S. M. Mok, P. Lin, H. L.W. Chan

Research output: Chapter in book / Conference proceedingConference article published in proceeding or bookAcademic researchpeer-review


Organic thin-film transistors (OTFT) are excellent candidates for the application on disposable sensors due to their potentially low-cost and easy fabrication process. Two types of OTFT-based sensors have been studied. One is light sensitive phototransistor based on the composite of poly(3-hexylthiophene) and Ti02 nanoparticles. The device shows a quick change of channel current under light exposure, which can be attributed to a positive shift of the threshold voltage induced by accumulated electrons trapped by the Ti02 nanoparticles in the channel. Another one is for sensing DNA hybridization. Both single and double strand DNA molecules are immobilized on the surface of the Au source/drain electrodes of different devices, inducing a dramatic change in the performance of the OTFTs. Single strand DNA and double strand DNA are differentiated successfully in the experiments indicating that this is a promising technique for sensing DNA hybridization without labeling.
Original languageEnglish
Title of host publicationECS Transactions - Thin Film Transistors 9, TFT 9
Number of pages10
Publication statusPublished - 1 Dec 2008
EventThin Film Transistors 9, TFT 9 - 214th ECS Meeting - Honolulu, HI, United States
Duration: 13 Oct 200816 Oct 2008


ConferenceThin Film Transistors 9, TFT 9 - 214th ECS Meeting
Country/TerritoryUnited States
CityHonolulu, HI

ASJC Scopus subject areas

  • Engineering(all)


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