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- Title
Efficient charge carrier control on single walled carbon nanotube thin film transistors using water soluble polymer coatings.
- Authors
Li, Zhao; Ding, Jianfu; Lapointe, François; Malenfant, Patrick R. L.
- Abstract
SWCNT-based thin-film transistors (TFTs) typically display unipolar p-type electrical characteristics in ambient condition due to the O2/H2O redox couple. However, complementary circuits that combine both p and n channels are preferred due to lower power requirements. Typical approaches with small molecule or polymeric dopants often yield ambipolar devices, or unstable n-type devices while concomitantly suppressing the on-current and mobility. Herein, we demonstrate a charge carrier control strategy using aqueous-based polymeric coatings that enable n-type devices with comparable performance to p-type devices. Specifically, we used a polyvinyl alcohol (PVA) coating layer containing a minority fraction of polyethyleneimine (PEI) (0.06–1.1 % w/w) to effectively switch the transfer characteristics from p-type to n-type, while maintaining decent electrical characteristics. Moreover, we demonstrate the ability to fine-tune the n branch threshold voltage via the annealing temperature. A similar strategy provides a balanced p branch on-current by incorporating PVA as a minor component (0.1-6 % w/w) into a polyacrylic acid (PAA) matrix. Through effective n-type conversion and p-type balancing, we demonstrate a simple SWCNT-based inverter. Considering the low-cost, environmentally friendly compositions and aqueous processability, this approach is attractive for large scale complementary printable circuits.
- Subjects
THIN film transistors; SINGLE walled carbon nanotubes; AQUEOUS polymeric coatings; CHARGE carriers; CARBON nanotubes; WATER use; POLYMERS; POLYVINYL alcohol
- Publication
Journal of Materials Science: Materials in Electronics, 2021, Vol 32, Issue 19, p23923
- ISSN
0957-4522
- Publication type
Article
- DOI
10.1007/s10854-021-06852-z