[SOLVED] why in APD PIN most multiplication happens in intrinsic region????

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stackprogramer

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hi,my question is about APD detector:
why in APD PIN most multiplication happens in intrinsic region????and a little in n or p region?
a reason that i think is big resistance in intrinsic region
 

finally i conclude that when multiplication is happened that electric field is high,and in this region is true this point.
 

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