How we calculate the actual voltage that can be applied to a solar cell?
Dear Bulkish,
Any solar cell is cosidered as an illuminated junction. This junction may be homogeneous like the standard pn solar cells or hetero junction like DSSC. Both junction types act as a rectifying diode in case of dark. Therefore, it has a forward and reverse part of the iv characteristics. When illuminated, the iv characteristics will be shifted downward to a negative current and consequently the cell will have its characteristics extending in three quarters of the iv plane. The solar cell operation is restricted to the fourth quadrant. In the third and first quarter the solar cell acts as a photo diode.
In order to cover the whole range of operation in the three quarters, one have to scan the the voltage from nearly -1V to +1V. The reverse bias is useful to determine the shunting effect and the quality of the collecting contacts. The part from V=0, short circuit to V=Voc= .6V is the solar cell operation the part of V> Voc is for the effect of the series resistance. The minimum range of scanning the voltage is that of the solar cell mode of operation.
wish you success
Thank you Sir Abdelhalim Zekry....Can we see Voc from data directly?
Hi,
The perfect answer which introduced by Dr. Zekry and I completely agree with him. Not this range is standard scale but as the minimum range of scanning the voltage is that of the solar cell mode of operation.
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