Confused by material description in device descriptor file

[amal banerjee]

Could some Aestimo guru please help:

The 'sample_pn.py' contains:

# REGIONS
# Region input is a two-dimensional list input.
# An example:
# Si p-n diode. Firstly lets picturize the regional input.
#| Thickness (nm) | Material | Alloy fraction | Doping(cm^-3) | n or p type |
# Layer 0 |  250.0  |  Si  |  0  | 1e16 | n  |
# Layer 1 |  250.0  |  Si  |  0  | 1e16 | p  |

But right after that:

material1 =[[3140.5, 'Si', 0.0, 0.0, 0.7e+17, 'p','b'],
                      [3140.5, 'Si', 0.0, 0.0, 0.7e+16, 'n','b']]
material =[[500, 'Si', 0.0, 0.0, 1e+19, 'p','b'],
                    [500, 'Si', 0.0, 0.0,1e+19, 'n','b']]

Could you please explain: 

1. what the extra 0.0 right after the alloy fraction is for ?

2. is the 'b' supposed to mean, right after the doping type n|p ?

Thanks in advance.

[Sefer Bora Lisesivdin]

Dear Banarjee,

The first is for the x alloy fraction, and the second is for the y alloy fraction. The second one can be used in quaterneries like InxGa(1-x)AsyP(1-y). For Si, they are not used. For ternary alloys like AlxGa1-xAs, y is not used. The b and w at the end are used for quantum wells. B is for barrier layers, and W is for the well layer.

İyi çalışmalar,

Sefer Bora Lisesivdin

Professor of Physics, PhD, SMIEEE
Gazi University, Department of Physics, Ankara, TURKEY.

Tel: +90-312-2021391
Cellular: +90-541-6602672
Web (group): http://www.lrgresearch.org
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Email: bo...@gazi.edu.tr

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