$adddiffusivedope

$adddiffusivedope is the command to put diffusive dopant distribution in the device. The doping density decay can be either exponential decay or Gaussian distribution. The command is

$adddiffusivedope
N_region
type  regionID Ndope  activation_energy  x_left  y_bottom  x_right y_top $\alpha_x$ $\alpha_y$  
type  regionID Ndope  activation_energy  x_left  y_bottom  x_right y_top $\alpha_x$ $\alpha_y$  
...
...
Nth_type ....  

type: Can be 1, 11, 111, 2, 12, 112. Please see below
regionID:  The region No to use the diffusive doping
Ndope: Na pr Nd  Posive is for n-type, negative is for p-type
$alphax$ and $alphay$ is the diffusion length in x and y direction. The unit is $\mu m$

For type = 1
x_left < x < x_right  y_bottom < y < y_top :  $N_{d,a} = Ndope$
x < x_left    : $N_{d,a} = Ndope * exp(-\alpha_{x}(|x-x_{left}|))$ 
x > x_right   : $N_{d,a} = Ndope * exp(-\alpha_{x}(|x-x_{left}|))$ 
y < y_bottom  : $N_{d,a} = Ndope * exp(-\alpha_{y}(|y-y_{bottom}|))$ 
y > y_top     : $N_{d,a} = Ndope * exp(-\alpha_{y}(|y-y_{top}|))$