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We present results for electronic transport measurements on largethree-dimensional arrays of CdSe nanocrystals. In response to a step in theapplied voltage, we observe a power-law decay of the current over five ordersof magnitude in time. Furthermore, we observe no steady-state dark current forfields up to 10^6 V/cm and times as long as 2x10^4 seconds. Although thepower-law form of the decay is quite general, there are quantitative variationswith temperature, applied field, sample history, and the material parameters ofthe array. Despite evidence that the charge injected into the film during themeasurement causes the decay of current, we find field-scaling of the currentat all times. The observation of extremely long-lived current transientssuggests the importance of long-range Coulomb interactions between charges ondifferent nanocrystals.Comment: 11 pages, 10 figure

Electronic transport in films of colloidal CdSe nanocrystals