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(Color online) vs for device A (Al electron injecting electrode) for , , , . Empty symbols: measured data; solid lines: fit to the data using Eq. (1); for Eq. (3) was used as well. Inset: versus the square root of the net electric field , extracted using the transit time obtained from the fits. The solid line is a linear fit of vs .
EL (a), EA (b) and C (c) vs for device B ( electron injecting electrode). In (b) the magnitude of EA is plotted. There is a sign change in EA at , above which bipolar injection sets on and both EL and negative contribution to are apparent.
(Color online) Frequency dependence of the capacitance for device B ( electron injecting electrode) at (two-dimensional plot) and various other bias voltages (three-dimensional inset). Empty symbols: measured data; solid lines: fit to the data using Eqs. (1) and (3).
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