Figure 7
(a) Frequency of voltage oscillations vs the external temperature for \(C_{\mathrm{ext}} = 150\) nF (dark cyan triangles) and \(C_{\mathrm{ext}} = 40\) nF (pink stars). The curves obtained by the model of capacitor charging and discharging37 (pink dashed and dark cyan solid lines) are also plotted. (b) TCAD simulated periods of charging \(\tau _{\mathrm{ch}}\) (downward triangles) and discharging \(\tau _{\mathrm{dis}}\) (upward triangles) for \(C_\mathrm{ext} = 150\) nF. The dotted and dashed lines are the curves for \(\tau _{\mathrm{ch}}\), \(\tau _{\mathrm{dis}}\) by applying the circuit equations37.
