|
|||||
|
|
Facile conversion of polymer organic thin film transistors from ambipolar and p-type into unipolar n-type using polyethyleneimine (PEI)-modified electrodes |
|
| Authors: | Bin Sun Wei Hong Emmanuel Thibau Hany Aziz Zheng-Hong Lu Yuning Li |
| Affiliation: | 1. Department of Chemical Engineering, Waterloo Institute for Nanotechnology (WIN), 200 University Avenue West, Waterloo, Ontario N2L 3G1, Canada;2. Department of Materials Science and Engineering, University of Toronto, 184 College St., Toronto, Ontario M5S 3E4, Canada;3. Department of Electrical and Computer Engineering, Waterloo Institute for Nanotechnology (WIN), 200 University Avenue West, Waterloo, Ontario N2L 3G1, Canada |
| Abstract: | We report here a successful polarity conversion of organic thin film transistors (OTFTs) based on several polymer semiconductors with low-lying LUMO (lowest unoccupied molecular orbital) energy levels (?−4 eV) from ambipolar and even p-type into unipolar n-type devices using an ultrathin layer (∼2–5 nm) of polyethyleneimine (PEI) to modify the source and drain contacts. The work function of gold is substantially reduced with the PEI layer on its surface, which effectively suppresses the injection of holes and thus enables electron-only charge transport of these polymers in OTFTs. This general approach of electrode work function modification broadens the scope of available polymer semiconductors for use in printed electronics where n-channel OTFTs are needed. |
| Keywords: | Ambipolar polymer semiconductors n-Type polymer semiconductors Polarity conversion Organic thin film transistors Work function reduction |
| 本文献已被 ScienceDirect 等数据库收录！ | |