Invited Presentation: Optoelectronic and Thermal Transport Properties of Carbon Nanotubes and Related Materials

I will report our latest results studying the optoelectronic properties and thermal transport characteristics of nanoscale materials and devices. In carbon nanotubes pn-junctions, we observe Zener tunneling behavior and photocurrent generation in quasi-metallic nanotubes¹ and non-ideal diode behavior in semiconducting nanotube². We observe enhanced photoluminescence and photocurrent in monolayer MoS₂ under ionic liquid gating conditions due passivation of surface states. The Fabry-Perot resonance in GaAs nanowires can also be significantly enhanced through surface passivation and local field enhancement. Lastly, the thermal interface conductance across graphene/hexagonal boron nitride heterojunctions are measured using an electrical heating/optical measurement technique.

1.    Amer, M.R., S.-W. Chang, R. Dhall, J. Qiu and S. Cronin, Zener Tunneling and Photocurrent Generation in Quasi-Metallic Carbon Nanotube pn-Devices. Nano Letters, DOI: 10.1021/nl402334e (2013).

2.    Chang, S.-W., K. Bergemann, R. Dhall, J. Zimmerman, S. Forrest and S. Cronin, Non-ideal Diode Behavior and Band Gap Renormalization in Carbon Nanotube P-N Junctions. IEEE Transactions on Nanotechnology, DOI: 10.1109/TNANO.2013.2287124 (2013).