title: Piperidine induced polarity conversion in single-walled carbon nanotube field effect transistors.
abstract: Piperidine is found to be an efficient electron doping agent that converts as-prepared p-type single-walled carbon nanotube (SWCNT) field effect transistors (FETs) into n-type SWCNT-FETs. Electron transfer from the amine group in piperidine to the SWCNTs is suggested to be the origin of the p- to n-type conversion. The effect of electron doping is further supported by the Raman tangential G(+) and G(-)-peak downshift up to 3 cm(-1) without the peak broadening. No detectable change in the Raman D-peak suggests non-covalent attachment of piperidine to the SWCNTs. A low temperature (110 °C) Si(3)N(4) passivation layer is used to maintain the long term air stability of the converted n-type devices. A complementary SWCNT inverter is demonstrated through integrating the n- and p-type SWCNT-FETs.
authors.affiliation: Microelectronics Centre, School of Electrical and Electronic Engineering, Nanyang Technological University, Singapore.
authors.forename: Kumar
authors.initials: K
authors.lastname: Raj
authors.forename: Qing
authors.initials: Q
authors.lastname: Zhang
authors.forename: Chao
authors.initials: C
authors.lastname: Liu
authors.forename: Mary B Chan
authors.initials: MB
authors.lastname: Park