How does the P-Gate structure achieve e-mode in GaN HEMTs ?

03 December 2018 1 4K Report

If the negative bound charges at the P-GaN/barrier interface due to change in polarization are all it takes to lift the conduction band, what's the role of the P-type doping? Difference in polarization gives the bound charges, doping has nothing to do with polarization. Why is the doping necessary?

J. Anaya

Dear Franklin,

it is doped because you need to rise the band gap, take a look to this paper:

https://www.sciencedirect.com/science/article/pii/S1369800117316554

Kind regards,

Julian

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