Enhanced semiconductor nanocrystal conductance via solution grown contacts.
We report a 100000-fold increase in the conductance of individual CdSe nanorods when they are electrically contacted via direct solution phase growth of Au tips on the nanorod ends. Ensemble UV-vis and X-ray photoelectron spectroscopies indicate this enhancement does not result from alloying of the nanorod. Rather, low temperature tunneling and high temperature (250-400 K) thermionic emission across the junction at the Au contact reveal a 75% lower interface barrier to conduction compared to a control sample. We correlate this barrier lowering with the electronic structure at the Au-CdSe interface. Our results emphasize the importance of a nanocrystal surface structure for robust device performance and the advantage of this contact method.
Sheldon
Matthew T
MT
University of California, Berkeley, California 94720, USA.
Trudeau
Paul-Emile
PE
Mokari
Taleb
T
Wang
Lin-Wang
LW
Alivisatos
A Paul
AP