$gaussiantraps

出自 DDCC TCAD TOOL Manual
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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


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