protected override void Set_Material_Parameters()
{
material = Material.Substrate;
Material specific_material = Material.GaAs;
ILayer tmp_layer;
if (specific_material == Material.GaAs)
{
tmp_layer = new GaAs_Layer(new Slab(0.0, 0.0), -1);
}
else if (specific_material == Material.AlGaAs)
{
// create a temporary gaas layer to obtain the material properties from (assume typical 33% AlGaAs)
tmp_layer = new AlGaAs_Layer(new Slab(0.0, 0.0), -1, 0.33);
}
else
{
throw new NotImplementedException();
}
permitivity = tmp_layer.Permitivity;
// set the GaAs band gap and acceptor/donor energies are positivie and show how far from the band gap centre the donors are
this.band_gap = tmp_layer.Band_Gap;
allow_donors = true;
this.acceptor_energy = tmp_layer.Acceptor_Energy; this.donor_energy = tmp_layer.Donor_Energy;
}
static ILayer Create_Layer(Dictionary<string, object> data)
{
// get various necessary properties from this list
Material mat = Layer_Tool.GetMaterial((string)data["mat"]);
Geometry_Type geom_type;
if (data.ContainsKey("geom")) { geom_type = GetGeometryType((string)data["geom"]); } else geom_type = Geometry_Type.slab;
// set geometry
IGeom geom;
switch (geom_type)
{
case Geometry_Type.slab:
geom = new Slab((double)data["zmin"], (double)data["zmax"]);
break;
case Geometry_Type.sheet:
geom = new Sheet((double)data["zmin"]);
break;
case Geometry_Type.strip:
geom = new Strip((double)data["zmin"], (double)data["zmax"], (double)data["dx"], (double)data["dy"], (double)data["width"], (double)data["theta"]);
break;
case Geometry_Type.half_slab:
geom = new Half_Slab((double)data["zmin"], (double)data["zmax"], (double)data["dx"], (double)data["dy"], (double)data["theta"]);
break;
case Geometry_Type.half_strip:
geom = new Half_Strip((double)data["zmin"], (double)data["zmax"], (double)data["dx"], (double)data["dy"], (double)data["width"], (double)data["theta"]);
break;
case Geometry_Type.triangle_slab:
geom = new Triangle_Slab((double)data["zmin"], (double)data["zmax"], (double)data["x0"], (double)data["y0"], (double)data["theta1"], (double)data["theta2"]);
break;
default:
throw new NotImplementedException("Error - Unknown geometry");
}
// create layer
ILayer result;
switch (mat)
{
case Material.GaAs:
result = new GaAs_Layer(geom, (int)data["layer_no"]);
break;
case Material.AlGaAs:
result = new AlGaAs_Layer(geom, (int)data["layer_no"], (double)data["x"]);
break;
case Material.InGaAs:
result = new InGaAs_Layer(geom, (int)data["layer_no"], (double)data["x"]);
break;
case Material.InAlAs:
result = new InAlAs_Layer(geom, (int)data["layer_no"], (double)data["x"]);
break;
case Material.PMMA:
result = new PMMA_Layer(geom, (int)data["layer_no"]);
break;
case Material.Al2O3:
result = new Al2O3_Layer(geom, (int)data["layer_no"]);
break;
case Material.Metal:
result = new Metal_Layer(geom, (int)data["layer_no"]);
break;
case Material.Air:
result = new Air_Layer(geom, (int)data["layer_no"]);
break;
// substrate always comes from -infty
case Material.Substrate:
result = new Substrate_Layer(new Slab(-1.0 * double.MaxValue, (double)data["zmax"]), (int)data["layer_no"]);
break;
default:
throw new NotImplementedException("Error - Unknown material");
}
// if this is actually a composite layer, then rewrite result... (this is simpler than putting a "Composite" material for the switch above)
if (data.ContainsKey("composite"))
if ((bool)data["composite"])
result = Create_Composite_Layer(result, data, geom);
// and set dopent levels if necessary
if (data.ContainsKey("nd") || data.ContainsKey("na"))
{
if (!data.ContainsKey("nd"))
data.Add("nd", 0.0);
if (!data.ContainsKey("na"))
data.Add("na", 0.0);
// use a factor of 10^-21 to convert from cm^-3 to nm^-3
data["na"] = 1.0e-21 * (double)data["na"];
data["nd"] = 1.0e-21 * (double)data["nd"];
result.Set_Dopents((double)data["na"], (double)data["nd"]);
}
return result;
}
