1) Consider a non-ideal MOS structure with the following band diagram at zero ga

Question

1) Consider a non-ideal MOS structure with the following band diagram at zero gate bias (VG = 0). a) Is this nMOS or pMOS technology? b) What is the polarity (+ or -) of the flat band voltage? Briefly explain your reasoning. c) What is the polarity (+ or -) of the threshold voltage? Briefly explain your reasoning. d) Is this an enhancement mode or depletion mode device? Briefly explain your reasoning. e) Sketch the charge density in the semiconductor for this structure at zero gate bias (VG = 0) and identify the source of each block of charge.

Explanation / Answer

1) PMOS technology

2) flat band voltage is of positive polarity type

3) thresold voltage is of negative polarity type

4) enhancement mode type because it has more acceptor level in thresold voltage side

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