Question

Write the equation of current for the diode (i.e. solar cell) in the light. Compare it with diode current in dark ?

Answer 1

Answer:

$Isc -I = Io [e^{\frac{qv}{nKt}} - 1]$  

Explanation:

the equation of current for the diode is

$I = Isc - Io [e^{\frac{qv}{nKt}} - 1]$     ..........................1

here Isc is short circuit current

Io is the reverse saturation or the dark current

I  is load current

q is charge

K is Boltzman constant i.e 1.381 ×$10^{-23}$ J/K

n is ideality factor

T is absolute temperature

and

here Isc - I is net current flow through diode and actual current when it is in light

so

$Isc -I = Io [e^{\frac{qv}{nKt}} - 1]$  

here we know Io is dark saturated current it mean in the absence of light diode leak current density

and Io is important parameter to differentiate between diode