def test_BL_correction():
wl = np.linspace(800, 950, 4) * 1e-9
GaAs = material("GaAs")()
thick_cell = SolarCell([Layer(material=GaAs, width=si("20um"))])
opts = State()
opts.position = None
prepare_solar_cell(thick_cell, opts)
position = np.arange(0, thick_cell.width, 1e-9)
opts.position = position
opts.recalculate_absorption = True
opts.no_back_reflexion = False
opts.BL_correction = False
opts.wavelength = wl
solve_tmm(thick_cell, opts)
no_corr = thick_cell.absorbed
opts.BL_correction = True
solve_tmm(thick_cell, opts)
with_corr = thick_cell.absorbed
assert with_corr == approx(
np.array([6.71457872e-01, 6.75496354e-01, 2.09738887e-01, 0]))
assert no_corr == approx(
np.array([6.71457872e-01, 6.75496071e-01, 2.82306407e-01, 0]))
def test_inc_coh_tmm():
GaInP = material("GaInP")(In=0.5)
GaAs = material("GaAs")()
Ge = material("Ge")()
optical_struct = SolarCell([
Layer(material=GaInP, width=si("5000nm")),
Layer(material=GaAs, width=si("200nm")),
Layer(material=GaAs, width=si("5um")),
Layer(material=Ge, width=si("50um")),
])
wl = np.linspace(400, 1200, 5) * 1e-9
options = State()
options.wavelength = wl
options.optics_method = "TMM"
options.no_back_reflection = False
options.BL_correction = True
options.recalculate_absorption = True
c_list = [
["c", "c", "c", "c"],
["c", "c", "c", "i"],
["c", "i", "i", "c"],
["i", "i", "i", "i"],
]
results = []
for i1, cl in enumerate(c_list):
options.coherency_list = cl
solar_cell_solver(optical_struct, "optics", options)
results.append(optical_struct.absorbed)
A_calc = np.stack(results)
A_data = np.array(
[[0.5742503, 0.67956899, 0.73481184, 0.725372, 0.76792856],
[0.5742503, 0.67956899, 0.73481184, 0.725372, 0.76792856],
[0.5742503, 0.67956899, 0.73474943, 0.70493469, 0.70361194],
[0.5742503, 0.67956899, 0.70927724, 0.71509221, 0.71592772]])
assert A_calc == approx(A_data)
default_options.light_source = LightSource(source_type='standard',
version='AM1.5g',
x=default_options.wavelength,
output_units='photon_flux_per_m')
# IV control
default_options.voltages = np.linspace(0, 1.2, 100)
default_options.mpp = False
default_options.light_iv = False
default_options.internal_voltages = np.linspace(-6, 4, 1000)
default_options.position = None
default_options.radiative_coupling = False
# Optics control
default_options.optics_method = 'BL'
default_options.recalculate_absorption = False
default_options = merge_dicts(default_options, ASC.db_options, PDD.pdd_options,
rcwa_options)
def solar_cell_solver(solar_cell, task, user_options=None):
""" Solves the properties of a solar cell object, either calculating its optical properties (R, A and T), its quantum efficiency or its current voltage characteristics in the dark or under illumination. The general options for the solvers are passed as dicionaries.
:param solar_cell: A solar_cell object
:param task: Task to perform. It has to be "optics", "iv", "qe", "equilibrium" or "short_circuit". The last two only work for PDD junctions
:param user_options: A dictionary containing the options for the solver, which will overwrite the default options.
:return: None
"""
if type(user_options) in [State, dict]:
options = merge_dicts(default_options, user_options)
Layer(material=GaAs, width=si("200nm")),
Layer(material=GaAs, width=si("5um")),
],
kind="DA",
),
Layer(material=Ge, width=si("50um")),
])
wl = np.linspace(250, 1700, 300) * 1e-9
options = State()
options.wavelength = wl
options.optics_method = "TMM"
options.no_back_reflection = False
options.BL_correction = True
options.recalculate_absorption = True
options.positions = [1e-8, 1e-9, 1e-8, 1e-7]
options.theta = 0
c_list = [
["c", "c", "c", "c"],
["c", "c", "c", "i"],
["c", "i", "i", "c"],
["i", "i", "i", "i"],
]
titles = [
"All coherent",
"Bottom Ge layer explicity incoherent",
"Both layers of GaAs junction incoherent",
"All layers incoherent",