=.2- (10) In order to increase the output power of a solar cell,we must reduce the Rs and increase the Rsh Figure 8.Equivalent circuit of solar cell 【Instrument】 Silicon Photocell,Optical Track and Substrate,High intensity white light LED,Lens, Digital multimeter,Load Resistance(potentiometer 100 k),Color Filter,Polarization Apparatus, Regulated Power Supply,Sampling Resistance (100 k),Divider Resistance R1(150 k)and R(50k2), Solar cells'component,power rate 5W,Light source,300W halogen tungsten lamp.Two digital multimeters.Two variable resistances and one wiring-board. 【Experiment】, 1.Photocell 1)Study the illumination characteristics of the SPC. (1)Measure the short-circuit current as a function of illumination It is very difficult to get the exact short-circuit current because it changes dramatically as a function of illumination.Instead,we will measure the voltage on a sampling resistance(100 and get the corresponding current. (2)Measure the open circuit voltage as a function of illumination The illumination is varied by changing the distance between the SPC and the light source. You can get the corrected value from the lab.Please pay attention to the distribution of the data. .7-- 7 - sh s B s ph R V R I nk T q V R I I I I + − ⎥ ⎥ ⎦ ⎤ ⎢ ⎢ ⎣ ⎡ − ⎭ ⎬ ⎫ ⎩ ⎨ ⎧ + = − 1 ( ) 0 exp （10） In order to increase the output power of a solar cell, we must reduce the Rs and increase the Rsh. Rs Iph D Rsh Figure 8. Equivalent circuit of solar cell 【Instrument】 Silicon Photocell, Optical Track and Substrate, High intensity white light LED, Lens, Digital multimeter, Load Resistance (potentiometer 100 kΩ), Color Filter, Polarization Apparatus, Regulated Power Supply, Sampling Resistance (100 kΩ), Divider Resistance R1(150 kΩ) and R(50 kΩ), Solar cells’ component, power rate 5W, Light source, 300W halogen tungsten lamp. Two digital multimeters. Two variable resistances and one wiring-board. 【Experiment】 1. Photocell 1) Study the illumination characteristics of the SPC. (1) Measure the short-circuit current as a function of illumination It is very difficult to get the exact short-circuit current because it changes dramatically as a function of illumination. Instead, we will measure the voltage on a sampling resistance (100 Ω) and get the corresponding current. (2) Measure the open circuit voltage as a function of illumination The illumination is varied by changing the distance between the SPC and the light source. You can get the corrected value from the lab. Please pay attention to the distribution of the data