This letter presents a simple theory to calculate the threshold voltage of charge storage in acoustic-charge-transport devices and experimental results that correlate well with the theory. It is found both experimentally and theoretically that the threshold voltage of charge storage increases with increasing surface acoustic wave power and nominal charge-transport depth. The threshold voltage of charge storage is also shown to be relatively independent of the amount of charge stored and is shown to decrease with increasing negative bias on the charge-storage electrode.
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