Consider a small module based on interconnected tandem cells of hydrogenated amorphous and microcrystalline silicon as depicted in the figure below. The Voc of a single tandem cell is 1.35V and the short-circuit density Jsc is 12mA/cm2.
Which combination of the external parameters can reflect the external parameters of the module depicted in the figure above?
a) Voc,module=16.2V, Isc,module=60mA
b) Voc,module=16.2V, Isc,module=120mA
c) Voc,module=32.4V, Isc,module=720A
d) Voc,module=32.4V, Isc,module=120mA
Option b
what is the correct answer? help plz
To determine the combination of external parameters that reflect the external parameters of the module depicted in the figure, we need to consider the relationship between the individual cell parameters and the module parameters.
The module Voc (Voc,module) is equal to the sum of the Voc of each individual tandem cell. Similarly, the module Isc (Isc,module) is equal to the sum of the Jsc of each individual tandem cell.
Given that the Voc of a single tandem cell is 1.35V and the Jsc is 12mA/cm2, we can determine the module parameters as follows:
a) Voc,module = 16.2V
Isc,module = 12mA/cm2 * Total area of tandem cells in the module
b) Voc,module = 16.2V
Isc,module = 12mA/cm2 * Total area of tandem cells in the module
c) Voc,module = 32.4V
Isc,module = 12mA/cm2 * Total area of tandem cells in the module
d) Voc,module = 32.4V
Isc,module = 12mA/cm2 * Total area of tandem cells in the module
Since the Voc of a single tandem cell is 1.35V, the module Voc should be a multiple of 1.35V. Therefore, options c) and d) are the only ones that have a module Voc that is a multiple of 1.35V.
From the options c) and d), we can choose the correct combination based on the module Isc. Given that the module Isc is equal to the sum of the Jsc of each individual tandem cell, it should be higher than the Jsc of a single tandem cell. Therefore, option d) is the correct combination:
d) Voc,module = 32.4V, Isc,module = 120mA
To determine the combination of external parameters that reflect the external parameters of the module depicted in the figure, we need to understand how the individual tandem cells are connected in the module.
The module consists of interconnected tandem cells, so the overall Voc and Isc of the module will depend on the number of tandem cells and how they are connected.
Let's analyze the given options:
a) Voc,module=16.2V, Isc,module=60mA
To determine if this combination is correct, we need to check if the given Voc and Isc are consistent with the individual tandem cell parameters. Given that the Voc of a single tandem cell is 1.35V, if we have n tandem cells in series, the Voc of the module should be n * 1.35V. Similarly, if we have m tandem cells in parallel, the Isc of the module should be m * 12mA.
For this option, n * 1.35V = 16.2V and m * 12mA = 60mA.
Let's solve these equations:
n * 1.35V = 16.2V
n = 16.2V / 1.35V
n = 12
m * 12mA = 60mA
m = 60mA / 12mA
m = 5
So, the combination satisfies the equations (n=12 and m=5), which means option a) is a valid combination.
Let's continue with the other options.
b) Voc,module=16.2V, Isc,module=120mA
Using the same approach as before:
n * 1.35V = 16.2V
n = 16.2V / 1.35V
n = 12
m * 12mA = 120mA
m = 120mA / 12mA
m= 10
Again, the combination satisfies the equations (n=12 and m=10), so option b) is also a valid combination.
c) Voc,module=32.4V, Isc,module=720A
n * 1.35V = 32.4V
n = 32.4V / 1.35V
n = 24
m * 12mA = 720mA
m = 720mA / 12mA
m = 60
This combination does not satisfy the equations since n should be an integer and m should be in mA, not A. So option c) is not valid.
d) Voc,module=32.4V, Isc,module=120mA
n * 1.35V = 32.4V
n = 32.4V/1.35V
n = 24
m * 12mA = 120mA
m = 120mA / 12mA
m = 10
This combination satisfies the equations (n=24 and m=10), so option d) is a valid combination.
Therefore, the correct combinations of the external parameters that reflect the external parameters of the module depicted in the figure are:
a) Voc,module=16.2V, Isc,module=60mA
b) Voc,module=16.2V, Isc,module=120mA
d) Voc,module=32.4V, Isc,module=120mA