University of Minnesota
School of Physics & Astronomy
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Boris Shklovskii

“Cooperative Charging in a Nanocrystal Assembly Gated By Ionic Liquid”
Tianran Chen, Brian Skinner, and B. I. Shklovskii, Phys. Rev. B 84, 245304 (2011)

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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 supercrystal 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, counterintuitively, the capacitance of the system is the sum of δ-functions located at a sequence of critical gate voltages. At each critical voltage, every nanocrystal acquires one additional electron.