Hi, I've been doing a solar cell characterization setup by using USB DAQ 6008.
Basically, I would use the DAQ 6008 to input and sweep voltage through the solar cell from V=0V to V=5V (forward bias) and measure the output current of the solar cell.
I am expecting a current near micro amps. I've tried using a resistor and input the voltage across it back to the DAQ 6008. So I would have a data where the x-axis is the bias voltage and y-axis is the voltage output of the solar cell which i then convert to current using I=V/R. The problem is I am getting only a linear graph and not forming a knee as what solar cells should behave. Is there something wrong with my setup? I am using a variable resistor and tried about 500 Kohms to 900Kohms. Is it also possible to just use a transimpedance amplifier to have voltage reading per bias voltage?
Thanks!
