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Drift mobility of electrons in AlGaN/GaN MOSHFET

Drift mobility of electrons in AlGaN/GaN MOSHFET

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The dependence of electron mobility μn on sheet electron concentration in the channel has been measured for the first time in AlGaN/GaN MOSHFETs. The maximum value of μn ≃ 1400 cm2/Vs observed at ns = 7 × 1012 cm-2, is very close to the value derived from Hall measurements made on the same wafer. As the gate-bias voltage VG approaches the threshold value VT (VGVT), the measured value of μn is ~100 cm2/Vs. This is very close to the value of electron mobility in a bulk GaN layer. The mechanism controlling the mobility against sheet-carrier density dependence is discussed.

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