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How to obtain the IV characterisation curve of aSi solar cell? 
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#1
Aug2609, 04:58 AM

P: 4

Hi guys,
I am currently doing a university project on the reliability studies of a aSi thinfilm solar cell with specs of 3V@25mA. However, I am stuck at the first step, which requires me to obtain the IV characterisation curve to derive the parameters of Isc,Voc and Pmax. My lab has a Keithley's 2636A Sourcemeter, which I am having trouble to operate. I am using a Philips PL EC 11W bulb to illuminate my solar cells as the previous Philips 100W tungsten bulb was melting the encapsulation of the solar cell. Both bulbs also did not manage to produce the standard IV curve of a solar cell. Is there anyone who is using the Keithley's 2636A sourcemeter and knows how to obtain the IV characterisation curve of a solar cell with the TSPlink software? If not, are there any other simpler ways to obtain the IV curve of the 3V@25mA solar cell? Thanks in advance. feel luck 


#2
Aug2609, 09:22 AM

P: 1,672

A regular tungsten bulb is a terrible light source for PV testing since they are designed to operate with sunlight. Sunlight and your bulb have two very different emission spectrums so your current set up will not yield the actual performance of the PV cell.
In order to develop your Vi curve you need a variable load. Something that will go from open circuit to a complete short of the cell and everything in between. You step your load in fixed increments and record your voltage and current over time. You then average that data at each step and plot it to get your Vi curve. To determine your MPP (maximum power point) you plot "voltage x current" and apply a curve fit to that curve. Then differentiate that curve and set it equal to zero, then solve for current density. That current density is the point with greatest power. Plug that value back into your equation for your power curve fit and you will then have your maximum power. 


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