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A solar cell of area 2 1.0 cm , operating at 1.0 sun intensity, has a short circuit current of 20 mA, and an open circuit voltage of 0.65 V. Assuming room temperature operation and thermal equivalent voltage of 26mV, the open circuit voltage (in volts, correct to two decimal places) at 0.2 sun intensity is _______.
Gate Electronic
Let Is1 = Short circuit current at 1 sun intensity
Is1 = 20 mA
Voc1=VTLn[Is1/I0]-----------(1)
Is2/Is1=1/5
Voc2=VTLn[Is2/I0]-----------(2)
From eq 1,2
Voc2=Voc1 +VTLn(Is2/Is1)
0.65+ VTLn[1/5]=0.68
=0.61(approx.)
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