Cooperative Charging in a Nanocrystal Assembly Gated By Ionic Liquid

Details Cooperative Charging in a Nanocrystal Assembly Gated By Ionic Liquid Cooperative Charging in a Nanocrystal Assembly Gated By Ionic Liquid

2011-09-08

arxiv.org/abs/1109.1858v1

Phys. Rev. B 84, 245304 (2011)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

9 pages, 4 figures

Scientific paper

10.1103/PhysRevB.84.245304

In order to make a densely packed assembly of undoped semiconductor nanocrystals conductive, it is usually gated by a room temperature ionic liquid. The ionic liquid enters the pores of the super-crystal assembly under the influence of an applied voltage. We study the capacitance of such a device as a function of the gate voltage. We show that, counter-intuitively, the capacitance of the system is the sum of delta-functions located at a sequence of critical gate voltages. At each critical voltage every nanocrystal acquires one additional electron.

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