Department of Physics, Engineering Physics & Astronomy

Department of Physics, Engineering Physics & Astronomy
Department of Physics, Engineering Physics & Astronomy

Carbon Nanotube Transistors and 1D Electroluminescence

Richard Martel
Canada Research Chair on Nanostructures and Interfaces, Department of Chemistry, Universite de Montreal, Quebec

Wednesday, January 26, 2005
12:30 PM @ Stirling A

Abstract:

Single-walled carbon nanotubes (SWNT) are a 1D molecular nanostructure made of conjugated C-C bonds. The nanotube band structure consists of a unique set of 1D subbands enabling sharp optical transitions as well as exceptional electrical conduction at room temperature. The structure and the band structure of SWNTs enable also novel 1D electron-hole phenomena that are potentially interesting in optoelectronics. In this talk, I will quickly review the electrical and optical properties of semiconducting SWNTs and show recent results with SWNT optoelectronic devices. In particular, I will present novel photo- emitters based on ambipolar nanotube field-effect transistors. These nanotube electrical emitters are currently the smallest light source ever made and their emission occurs through a direct band-gap carrier recombination process in 1D. Their spectra in the near IR region present information on the both the excitonic states and the carrier dynamics in the nanotube device. It is however a non-conventional emitter for that it does not require the presence of dopant and p/n junction. More details on the operation of the device will be presented.

Refreshments will be available after the talk. All are welcome!