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This section discusses some results from measurements of the threshold voltage Vt on chip H7#43. The array exhibits a sharp nonlinearity where the current jumps from essentially zero to a finite value (figure 5). The experimental definition of Vt is the voltage where the current rises above the noise level, which is of the order of 25 pA.
The ramp was run 10 000 times so that several Vt values could be collected and a histogram could be made. Figure 6 displays an example histogram. We discovered that sometimes two or even three peaks appeared in the histograms. The reason for this is unknown.
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