To find out the fill factor of given solar cell.

Aim

To find out the fill factor of given solar cell.

Apparatus Required:

Solar cell circuit, voltmeter, micro ammeter, digital multimeter.

Description:

Fill Factor: Fill factor is the ratio of actual maximum obtainable power (Vm * Im) to the theoretical (not actually obtainable) power.

Procedure:

1. Connect the circuit as shown in diagram.
2. Switch on the lamp.
3. Use digital multimeter as voltmeter and micro ammeter for measuring current.
4. Measure short circuit current (I _SC) for zero load (i.e. R _L = 0)
5. Measure open circuit voltage (V _OC) when RL is maximum.
6. Now make R _L= 0, vary RL and note corresponding values of voltage and current.
7. Plot I-V curve.
8. Draw a line making an angle 45 degree with X-axis to meet the curve at a Point, find its co-ordinate I _mand V _mgives maximum power dissipation.
9. Calculate fill factor ‘FF’.

Observation:

Tabular column:

Model Graph:

Observations (From Graph):

1. Short circuit current I _SC=------------μA
2. Open circuit voltage V_OC=------------V
3. Maximum current I_m=------------μA
4. Maximum voltage V_m=------------V

Calculations:

???????????????? ???????????????????????? ???????? ???? ???????????????????? ???????????????????? ???????????????? (????????) = ????????????????/???? _SC???? _OCx ????????????

???????? =----------%

Precautions:

1. Connections should be made carefully.
2. No external light should be incident on photo diode.

Result:

Fill factor of a given solar cell =------------------%

Reference books:

1. ”The Feynman Lectures in Physics”,R.P.Feynman,R.B. Leighton and M.Sands, Addison Wesley ,1963
2. Experiments in Modern Physics”,A.C.Melisson,Academic Press,N.Y. 1966
3. “Reliable Knoweldge”,J.Ziman, Cambridge university Press,Cambridge,1978
4. ”Laboratory Manual In Applied Physics”-Second edition-H.Sathyaseelam-New age International