$useBTBT

Modeling the band to band tunneling (BTBT) with the BTBT formalism. g a e f0 p exp -b e a2 e f0 p2 exp -b2 e f0 is set as 1v cm if only a is used please set a2 0.0 b2 0.0 p2 0.0 g cm -3 s -1 a cm -3 s -1 b mv cm $G=a\times |E{|}^p\times exp(-\frac{b}{|E|})$

For example:

$useBTBT 
a b p a2 b2 p2 
a b p a2 b2 p2 
a b p a2 b2 p2 
a b p a2 b2 p2
...
...
... N layers

In each layer, you will need to set the a b p coefficients. If you don't want to consider BTBT in this layer. please set a and a2 0.0