Hello,
I have a single junction Schottly solar cells (junction of thin film metal and semiconductor substrate) as can be seen in attached picture. There are two metal-semicondcutor junctions:
1- Schottky contact: Junction between semiconductor and metal X which produces rectifying I-V characteristics
2- Ohmic contact: Junction between semiconductor and metal Y which produces ohmic (linear) I-V characteristics
In order to calculate short circuit current density, what would be the correct area (A), which can be used in formula:
Jsc=Isc/A (mA/cm2)
Is Area (A):
a) the whole area of the cell (length * width)
b) the area of Schottky metal
c) the area of ohmic metal
Dear Amir,
The area of the solar cell is the defined by the area subjected to light. So it is equal to the whole horizontal cell area. The Schottky junction area is the total area of schottky junction between the semicondcutor and the Schottky blue metal. So there is some drawback of this u shaped junction as the dark area which is the junction area while the illuminated cell area is that flat horizontal area where light is falling.
Best wishes
Thank You Prof. Zekry!
So you mean the active area of the solar cell is the total horizontal area of the cell minus areas covered by Schottky and ohmic metals?
my belief is that the active area of solar cell is the area of the Schottky junction where there is the Schottky barrier height and the carriers are drifted and diffused. Basically the active area of the cell would relate to the size of the junction (whether it is a Schottky junction or a pen junction)
Can you please let me know of your thought on it?
Thank you!
P.S: by u shaped junction do yo mean horizontal structure?
Dear Amir,
Welcome again,
In order to review my understanding to the to your geometry. The top figure is the plan view and the bottom figure is the top view. So, please the figure was for me misleading. You have to put the figure captions under their respective figures. This is the first comment.
For sure the area of the junction as i said before is the contact area between the semiconductor layer and Schottky metal layer.
The cell area is the are subjected to light which is the total top area in the top figure and i mean the different densities are referred to this area. But you give an other definitions for the areas.
There is solar cells where junctions have u shape and collect from the top and side walls. The light is incident only from the top area which is the same time the cell area where one refer the area parameters to it such as the intensity of the incident solar radiation and current the cell current densities.
This my opinion about the area, but cab bring an other definition. However you must stick to the conventional terminology.
Best wishes
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