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Mobility of Air-Stable p-type Polythiophene Field-Effect Transistors Fabricated Using Oxidative Chemical Vapor Deposition

Air-stable organic field-effect transistors (FETs) based on an unsubstituted polythiophene (PT) channel, processed using oxidative chemical vapor deposition (oCVD), have been investigated. The intrinsic properties of PT, including its rigid backbone structure and resistance to reactions with water a...

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Bibliographic Details
Published in:Journal of electronic materials 2020-06, Vol.49 (6), p.3465-3471
Main Authors: Lee, Sunghwan, Song, Han Wook, Cho, Jae Yong, Radevski, Nik, Truc, Linh Nguyen Thi, Sung, Tae Hyun, Jiang, Zhong-Tao, No, Kwangsoo
Format: Article
Language:English
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Summary:Air-stable organic field-effect transistors (FETs) based on an unsubstituted polythiophene (PT) channel, processed using oxidative chemical vapor deposition (oCVD), have been investigated. The intrinsic properties of PT, including its rigid backbone structure and resistance to reactions with water and oxygen, lead to excellent air stability of oCVD PT-based FET devices. The effect of the channel/metalization contact resistance on the field-effect mobility ( μ FE ) of PT-based FETs has also been investigated. Due to the channel/metallization contact resistance, the actual voltages applied to the channel are found to be significantly lower than the intended drain bias because of the voltage drops that occur at the source/drain contacts. Transmission-line measurements reveal that more than 30% of the intended drain bias is lost at all gate voltages applied to the channel. Reconstructed output characteristics excluding the contact effect allow the extraction of a corrected μ FE , which is approximately 40% higher than that with contact resistance.
ISSN:0361-5235
1543-186X
DOI:10.1007/s11664-020-07967-5