Life Time and Diffusion Length in Silicon

 
Here are some values in tabulated form taken from data given by Wacker Siltronic.
Note that the conversion between diffusion length L and lifetime t involves the diffusion constant D via L = (Dt)1/2  which in turn contains the mobility µ via D = (kT/e) · µ.
The mobility µ, however, is a function of doping type and doping level. It comes as no surprise that the table must distinguish between doping type and level - and the differences can amount to a factor of 3!
Diffusion-
length L [µm]

Carrier Lifetime [µs]
n-type
p-type
10 Wcm 100 Wcm 10 Wcm 100 Wcm
100 8 8 3 3
200 34 32 13 11
300 76 72 30 24
400 135 129 54 44
500 211 201 84 68
700 414 394 165 133
1 000 845 804 336 2723
5 000 21 121 20 109 8393 6 798

With frame With frame as PDF

go to 3.1.1 Silicon: General Properties and Technologies

© H. Föll (Semiconductor - Script)