“…These field strengths correspond to reverse voltages of 500V and 800V, respectively, on our diode. Electron-beam potential profiling above these values for state-of-the-art reverse voltages in PSCD necessitates AE detection and more expensive apparatus (Commizoli andOpila 1987, Waldrop andHarris 1975). In addition, the reduction in signal between SE and AE may reduce the achievable voltage resolution.…”