Field effect transistor construction adopting heavy doped conduction substrate, inverse groove and earthed source pole
A field effect transistor, heavily doped technology, applied in semiconductor devices, electrical components, circuits, etc., can solve the problems of larger package size, larger device size, and increased device cost.
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[0023] Refer to figure 2 A cross-sectional view of an inverted trench FET device of the present invention with bottom source and top drain (ie, the source is at the bottom and the drain is at the top) and the source of the N-channel is grounded. The N-channel reverse-groove FET device whose source is grounded is supported on a P+ substrate 105 that functions as a bottom source. The alternative is to form P-channel devices on an N+ Si substrate, or use silicon carbide, gallium nitride (GaN) or other semiconductor substrates. A P epitaxial growth layer 110 is formed on top of the substrate 105. The active unit area is arranged on the substrate, and the termination area is usually arranged on the periphery of the substrate. The FET device 100 has a plurality of trenches opening on the top surface of the substrate, which are as deep as the lower part of the epitaxial growth layer 110. The trench opened in the active cell area is wider to form a gate. The sidewall of the trench to whic...
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