10.1021/nn3025496.s001
Xu Xie
Xu
Xie
Ahmad E. Islam
Ahmad E.
Islam
Muhammad A. Wahab
Muhammad A.
Wahab
Lina Ye
Lina
Ye
Xinning Ho
Xinning
Ho
Muhammad A. Alam
Muhammad A.
Alam
John A. Rogers
John A.
Rogers
Electroluminescence in Aligned Arrays of Single-Wall Carbon Nanotubes with Asymmetric Contacts
American Chemical Society
2012
metal contact
SWNT LEDs
threshold
exciton
metal contacts offer
Aligned Arrays
devices result
photon emission
electroluminescence
nanoscale emitters
wall carbon nanotubes
semiconductor light
terminal geometries
Asymmetric ContactsHigh quantum efficiencies
2012-09-25 00:00:00
Journal contribution
https://acs.figshare.com/articles/journal_contribution/Electroluminescence_in_Aligned_Arrays_of_Single_Wall_Carbon_Nanotubes_with_Asymmetric_Contacts/2483821
High quantum efficiencies and low current thresholds are important properties for all classes of semiconductor light emitting devices (LEDs), including nanoscale emitters based on single wall carbon nanotubes (SWNTs). Among the various configurations that can be considered in SWNT LEDs, two terminal geometries with asymmetric metal contacts offer the simplest solution. In this paper, we study, experimentally and theoretically, the mechanisms of electroluminescence in devices that adopt this design and incorporate perfectly aligned, horizontal arrays of individual SWNTs. The results suggest that exciton mediated electron–hole recombination near the lower work-function contact is the dominant source of photon emission. High current thresholds for electroluminescence in these devices result from diffusion and quenching of excitons near the metal contact.