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P channel enhancement mode MOSFET has P type material at the Source and also at the Drain. There is an N type material between them.
The gate is close to but separated from the N type material. If you negatively charge the gate, it forces electrons out of the N type material, and it starts acting like a P type material. Thus forming the P channel.
That means that while the gate is negatively charged, electrically speaking, the channel is positively charged. The N type material has electrons removed from it, forming temporary holes that electrons can slip through relatively easily. The enhancement mode transistor conducts current fairly well in that case.
On the other hand, positively charging the gate, just helps put more electrons in the N type material. So there’s solid PNP material, which doesn’t conduct.
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