Author Topic: p-type, n-type doping, transmission  (Read 3821 times)

0 Members and 1 Guest are viewing this topic.

Offline Lim changmin

  • Heavy QuantumATK user
  • ***
  • Posts: 28
  • Country: kr
  • Reputation: 0
    • View Profile
p-type, n-type doping, transmission
« on: July 8, 2024, 03:58 »
Hello, I am trying to dope amorphous silicon bulk structure with n, p-type and then try to calculate transmission spectrum, the results shows same.
I calculated same structure and just changed the type of doping.
I attached the py file that I used.

The only difference I made is n and p type doping
external_potential = AtomicCompensationCharge([
    ('doping_0', 2.0207760480856165e-07)
    ]) for n-type and

external_potential = AtomicCompensationCharge([
    ('doping_0', - 2.0207760480856165e-07)
    ]) for p-type

The transmission results appear same, so I attached only 1 figure.
So I was wondering if the results can show same results even if the doping is different

Thank you


Offline Anders Blom

  • QuantumATK Staff
  • Supreme QuantumATK Wizard
  • *****
  • Posts: 5585
  • Country: dk
  • Reputation: 101
    • View Profile
    • QuantumATK at Synopsys
Re: p-type, n-type doping, transmission
« Reply #1 on: July 29, 2024, 23:36 »
This is because you never apply the doping to any atoms, so it's not active.

However, it anyway would not make much sense to use this charge doping method for a bulk structure, because all it really does it shift the Fermi level. It's a technique that can be used in an interface like a p-n junction to shift the Fermi level differently in two parts of the system, to mimic n or p doping. But in a bulk crystal, it will just rigidly shift the zero level reference, and the transmission remains the same.

It's a bit hard to see what the purpose of bulk transmission for an amorphous material would be, but perhaps you should just add an explicit dopant atom (and then I would look at the DOS, not transmission).