Electronic transport in films of colloidal CdSe nanocrystals

摘要: We present results for electronic transport measurements on large three-dimensional arrays of CdSe nanocrystals. In response to a step in the applied voltage, we observe power-law decay current over five orders magnitude time. Furthermore, no steady-state dark fields up ${10}^{6} \mathrm{V}/\mathrm{c}\mathrm{m}$ and times as long $2\ifmmode\times\else\texttimes\fi{}{10}^{4} \mathrm{s}.$ Although form is quite general, there are quantitative variations with temperature, field, sample history, material parameters array. Despite evidence that charge injected into film during measurement causes current, find field scaling at all times. The observation extremely long-lived transients suggests importance long-range Coulomb interactions between charges different