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We investigate how temperature affects transport through large networks ofnonlinear conductances with distributed thresholds. In monolayers ofweakly-coupled gold nanocrystals, quenched charge disorder produces a range oflocal thresholds for the onset of electron tunneling. Our measurementsdelineate two regimes separated by a cross-over temperature $T^*$. Up to $T^*$the nonlinear zero-temperature shape of the current-voltage curves survives,but with a threshold voltage for conduction that decreases linearly withtemperature. Above $T^*$ the threshold vanishes and the low-bias conductanceincreases rapidly with temperature. We develop a model that accounts for thesefindings and predicts $T^*$.Comment: 5 pages including 3 figures; replaced 3/30/04: minor changes; final  versio

Percolating through Networks of Random Thresholds: Finite Temperature Electron Tunneling in Metal Nanocrystal Arrays