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6. Circuit and Device Simulation of Solar Cells and Modules 49

Table 1.3 Main Circuit Parameters of the Two Case Studies
Photowatt BP
Parameter PWP 201 MSX-60
I sc (A) 1.0317 3.87
V oc (V) 16.7785 21.1
I mp (A) 0.9120 3.56
V mp (V) 12.6490 17.1
36 36
N s
K V (V/K) NA 0.08
K I (A/K) NA 3 10 3

For the Photowatt-PWP 201, the two extraction methods are applied. Regarding
method 1, the ideality factor for the module is estimated to be n ¼ 45.1958.
Regarding method 2, the initial value of the shunt resistance is R sho ¼ 561.034 ac-
cording to measurements. Table 1.4 shows the extracted parameters using the two
methods. Fig. 1.40A shows the IeV characteristics.
Considering BP MSX-60, the first extraction method is only applied because of
the difficulty in determining the initial value of the shunt resistance. Here, the ide-
ality factor for the module is estimated to be n ¼ 46.8 (1.3 36). Also, Table 1.4
shows the extracted parameters and Fig. 1.40B presents the IeV characteristics
for the module at two different temperatures compared with the results obtained
from the datasheet. There is good agreement between the simulated and measured
characteristics proving that the single-diode model is satisfactory for describing
the behavior of the conventional solar cells and modules.

6.2 TCAD SIMULATION OF SOLAR CELLS

It is important to predict the device operation by TCAD (Technology Computer
Aided Design) simulations before fabrication. TCAD modeling and simulation plays

Table 1.4 Extracted Model Parameters of the Two Case Studies
Photowatt BP
PWP 201 MSX-60
Parameter Method 1 Method 2 Method 1
N 45.1958 45.5330 48.6
R s (U) 1.3483 1.3329 0.1606
R sh (U) 543.4009 559.7011 385.8654
I s (A) 1.3278 10 6 1.4690 10 6 1.9080 10 7
I ph (A) 1.0343 1.0342 3.8716