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Quantum Efficiency System

Photonics Spectra
Apr 2011
Sciencetech Inc.Request Info
 
A quantum efficiency system uses two light sources simultaneously to illuminate the solar cell being tested. Sciencetech Inc.’s SKU: SS-QE-150 quantum efficiency (QE) system comprises a 150-W tunable-wavelength monochromatic light source and a separate solar simulator for use as the white light bias. The light source is identical to the one used for the spectral response system, with a motorized optical chopper between the xenon light source and the scanning monochromator to modulate the light. A source meter used as an active load permits operating the test cell at various load conditions, including short-circuit, compensating for a series resistor required to sense the current produced by the modulated monochromatic light.


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GLOSSARY
internal
With reference to absorbance, absorptance, transmittance and the like, the processes occurring within a specimen between the entry and exit surfaces.
lock-in amplifier
A form of synchronous detector having a balanced amplifier in which the signal is applied to the grids of two tubes as the control signal is applied to their plates or another grid. The difference in output currents is then measured.
monochromatic
Composed of one color; having only one wavelength of radiation.
optical chopper
A mechanical or electrical-electromagnetic device for periodically interrupting or blocking abeam of light for a brief known interval. The three most common chopper types include the tuning fork chopper, the rotating shutter chopper (also referred to as rotating disc chopper) chopper and the more sophisticated optical chopper such as the Kerr cell.
solar cell
A device for converting sunlight into electrical energy, consisting of a sandwich of P-type and N-type semiconducting wafers. A photon with sufficient energy striking the cell can dislodge an electron from an atom near the interface of the two crystal types. Electrons released in this way, collected at an electrode, can constitute an electrical current.
xenon
A rare gas used in small high-pressure arc lamps to produce a high-intensity source of light closely resembling the color quality of daylight.
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