  We report an easy and broadly applicable method for the controlled
self-assembly of atomically precise Au32(nBu3P)12Cl8 nanoclusters into
micro-crystals. This enables the determination of emergent optoelectronic
properties resulting from long-range order in such assemblies. Compared to the
same nanoclusters in glassy, polycrystalline ensembles, we find a 100-fold
increase in the electric conductivity and charge carrier mobility as well as
additional optical transitions. We show that these effects are due to a
vanishing energetic disorder and a drastically reduced activation energy to
charge transport in the highly ordered assemblies. This first
structure-transport correlation on self-assembled superstructures of atomically
precise gold nanoclusters paves the way towards functional materials with novel
collective optoelectronic properties.
