Poly(ethyleneimine) Doping of CNTFETs: Effect of Solvent and Optimization of Doping Parameters
Carbon Nanotube Field Effect Transistor (CNTFET) when doped with the polymer Poly(ethyleneimine) (PEI) changes its behaviour from p-type to n-type. The solvent used to disperse this polymer plays a very important role in doping process. In this work we report the effect of two solvents: Methanol and DI water. We observe that DI water solvent gives better electrical characteristics such as higher ON current and gives higher yield of n-type CNTFET devices. We have reported the optimization of both the doping time and the concentration of the polymer solution to get the higher yield of n-type CNTFETs.
The authors would like to acknowledge the usage of National Nano fabrication Centre (NNfC) and Micro and Nano Characterization Facility (MNCF) at Centre for Nanoscience and Engineering (CeNSE), Indian Institute of Science (IISc) Bangalore.
- 7.K. Maehashi, T. Kishimoto, Y. Ohno, K. Inoue, K. Matsumoto, Complementary voltage inverters with large noise margin based on carbon nanotube field-effect—transistors with SiNx top-gate insulators. J. Vac. Sci. Technol. B Nanotechnol. Microelectron. Mater. Process. Meas. Phenom. 30(3), 03D108 (2012)Google Scholar
- 12.Q. Cao, S. Han, G.S. Tulevski, Fringing-field dielectrophoretic assembly of ultrahigh-density semiconducting nanotube arrays with a self-limited pitch. Nat. Commun. 5, ncomms6071 (2014)Google Scholar