1.Introduction: Testing of spectral response and quantum efficiency of solar cells is an important way to improve the level of technics (such as fuzzing, spreading and back field),judge the quality of silicon materials and research the characteristics of solar cells. 7-SCSpec l/II measurements systems can test spectral response, spectral reflectivity, internal and external quantum efficiency or IPCE（Monochromatic Incident Photon-to-Electron Conversion Efficiency）of solar cells.

2.System features:      High-power light source, continuous spectral irradiation without peak, ensuring repeatability      Patent monochromator ensures accuracy and repeatability, eliminates multi-level spectrum, little stray light.      Super capabilities of weak signal processing, improving signal to noise ratio, ensuring accuracy of measurement.      Patent design of sample chamber and sample fixture, easy clipping, good electrode contacting, little interference to signal.      Integrated, automatic, professional software: •Setting optional parameters of monochromator, filter wheel, Lock-in • Automatically scanning, signal amplifying, A/D, data acquiring and processing, graphics generating and displaying. • A variety formats of data backup • Automatically removing gross error, checking system error, linear error, cyclical error and T error.   3.    System Diagram                                                             2.    Main Specifications         Spectral Range        300-1100nm         Scanning Interval      5 - 50nm optional         Chopper Frequency    20-1000Hz         Repeatability          5%         Scanning Method      Automatic         Chopper Frequency    20-1000Hz         Repeatability          5%         Scanning Method      Automatic   4.    Testing Principle Absolute spectral response: The absolute spectral response of solar cell RΦC(λ) refers to the ratio of the output current of the solar cell IC(λ) and the radiation act on the cell Φ(λ) at a particular wavelength λ RΦC(λ)= IC(λ)/Φ(λ)                (A/W) In order to measure the radiation act on the solar cell, we usually use a standard detector, which absolute spectrum response is already know as RΦS(λ) at a particular wavelength λ. the output current of the standard detector under light A is IS(λ), and then the radiation power of light A at wavelength λ should be: ΦA(λ) = IS(λ)/RΦS(λ)                (A) measure the output current ofsolar cell at the same condition, that is ΦA (λ) = Φ(λ),then the absolute spectral response of the solar cell can be expressed as: RΦC(λ)= RΦS(λ) ×[IC(λ)/IS(λ)]          (A/W) External quantum efficiency (QE): Make use of the absolute spectral response of the solar cell, you can get external quantum efficiency η(λ) of solar cell as: η(λ)=1.24×RΦC(λ) /λ Spectral reflectivity: Through integrating sphere the monochromatic beam, reflected by whiteboard, collected by the sphere, generates a current Iw(λ), the same monochromatic beam reflected by solar cell, collected by the sphere, generates a current Ic(λ), if we know the spectral reflectivity of whiteboard is rw(λ),then the spectral reflectivity of solar cell will be: rc(λ)= rw(λ) ×[Ic(λ)/Iw(λ)] Internal quantum efficiency (IQE): Detract the influence of reflection we can get the internal quantum efficiency: ηi(λ)= η(λ)/(1-rc(λ))   5.    Professional Software Interface(English version optional)                                                 6.    Working Conditions The working conditions of the system will influence the accuracy of measurement. Here are the suggesting working conditions: a. Temperature :20-27 ℃ b. Relative humidity: less than 85% c. No corrosive gas d. No strong electromagnetic and shaking interference e. Power Supply: AC220 ± 22 V, frequency : 50 ± 1 Hz 7.    Results of silicon solar cell              spectral response curve           spectral  reflectance  curve                                        External quantum efficiency curve                           Internal quantum efficiency curve                              8.    System Picture: