it is the channel too short to make PLDOS of p-i-n junction looks like that

[njuxyh]

Hi :
recently, i have plot a PLDOS of P-i-N  junction model, and found the pictures look like  that :
i guess it is the too short channel length or too heavily doped on N region or p region? THANKS VERY MUCH IF SOMEONE COULD HELP ME

[Daniele Stradi]

The PLDOS shows clearly that the channel is too short. The PLDOS should be flat in the vicinity of the left and right boundaries. See, e.g., Fig. 1 in PHYS. REV. APPLIED 10, 014026 (2018).

Best regards,
Daniele