  We report a high-throughput and easy-to-implement approach to fabricate
microchannels of nanocrystal superlattices with dimensions of ~4 micrometer^2,
thus approaching the size of typical single-crystalline domains. By means of
microcontact printing, highly ordered superlattices with microscale dimensions
are transferred onto photolithographically prepatterned microelectrodes,
obtaining well-defined superlattice microchannels. We present step-by-step
guidelines for microfabrication, nanocrystal self-assembly and patterning to
archive large quantities of up to 330 microchannels per device for
statistically meaningful investigations of charge transport in
single-crystalline superlattice domains. As proof-of-concept, we perform
conductivity and field-effect transistor measurements on microchannels of PbS
nanocrystal superlattices. We find that the electric transport within
microchannel superlattices is orders of magnitude more efficient than within
conventional large-scale channels, highlighting the advantage of the near
single-crystalline microchannels presented in this paper.
