$gaussiantraps

Function gaussian-distribution traps.
Note that currently Gaussian-distribution traps only consider how carrier traps. The recombination with opposite carriers are not well considered. So it is only suitable for condition where the lifetime is very long.

Format

$gaussiantraps
 Gaussiantrap_num
 type Nt Et σ degeneracy $\tau_n~~~ \tau_p$

Parameter Explanation

• type : type = 1 is electron trap and type = 2 is hole trap. Type 201 is the hole trap relatives to Ev. The program will will convert 201 to 2 by adding Eg to the set Et. type 11 is the filled able electron traps and type 21 are the filled able hole traps. type 211 is Et relative to Ev.

• Gaussiantrap_num: =1/ How many Gaussian traps levels. Currently only support 1. In the future, more traps might be allowed.

• Nt : total trap concerntraion. The positive and negative value is decided by type. There is no need to put (+ or -) here. For example 1.0e16 $(cm^{-3})$
  

• Et : the depth of traps central. $(eV)$. The position of Et is decided by related position to Ec. For example, if trap is 1.1eV below conduction band, -1.1eV is used. Hole trap is using the same definition as electron trap, which is related to Ec also.
  

• σ : the FWHM of trap. $(eV)$
  

• degeneracy the degeneracy of traps we usually set as 1.
  

• $\tau_n$ : nonradiative lifetime of electrons. $(Sec.)$
  

• $\tau_p$ : nonradiative lifetime of holes. $(Sec.)$
  

Note that usually $\tau = \frac{1}{N_{t}v_{th}\sigma}$. Therefore, when Nt is increased, the non-radiative lifetime should decrease as well. Users need to adjust this by themselves.

Example

$gaussiantraps
1
1 9e16 -3.3 0.12 1 1e-8 1e-8 
1 9e16 -3.3 0.12 1 1e-8 1e-8 
2 1e18 -3.3 0.12 1 1e-8 1e-8 
2 1e18 -3.3 0.12 1 1e-8 1e-8
201 1e18 0.1 0.12 1 1e-8 1e-8

Note If Eg=3.4eV, 201 1e18 0.1 0.12 1 1e-8 1e-8 ,  0.1-3.4 = -3.3eV which is equal to 2 1e18 -3.3 0.12 1 1e-8 1e-8

The $gaussiantraps setting in GUI interface is here
1. After setting up the general structure, press Additional Function.
2. Check the box for Gaussian Traps and fill in these fields as needed!

Related commands: $traps (2D) , $multitraps