Single light path quantum efficiency test system

Abstract

The invention relates to a testing system of monochromatic light path quantum efficiency. The system comprises a halogen tungsten lamp source, a convex lens, a photointerrupter; a monochrometer, the halogen tungsten lamp source, the convex lens and the photointerrupter are arranged on the light path at the inlet of input light of the monochrometer; a phase-locking amplifier the frequency reference input terminal of which is connected with the chopped wave frequency output terminal of the photointerrupter; a computer is in charge of controlling and processing the data of the monochrometer and the phase-locking amplifier, thus leading the monochrometer and the phase-locking amplifier to work coordinately; a rotary sample positioning device is arranged on the light path at the outlet of output light of the monochrometer and is connected with the phase-locking amplifier by cables, and the rotary sample positioning device can lead the sample and the standard detector to be arranged at the same place of the light path by rotating; a pair of offset light sources are arranged around the light path at the outlet of the output light of the monochrometer, and the offset light source can lead the offset light to be sprayed on the surface of the sample to be tested, thus realizing the function of a non-measuring quantum battery for a short circuit sample.

Description

technical field [0001] The present invention relates to a test system for measuring the quantum efficiency and spectral response of semiconductor devices, especially multi-junction photovoltaic cells Background technique [0002] Quantum efficiency (QE) is an important parameter to characterize the performance of optoelectronic devices. The so-called quantum efficiency refers to the ratio of the number of photogenerated carriers generated in the device to the number of incident photons when the incident light is irradiated on the optoelectronic device. This is a dimensionless number less than 1. [0003] The principle of QE measurement is as follows: use a monochromator to decompose the white light emitted by the light source into monochromatic light of different wavelengths, and the monochromatic light is converted into pulsed light after being chopped by a chopper, and these pulsed monochromatic lights of different wavelengths are irradiated to the On the sample to be te...

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to provide a single optical path quantum efficiency testing system, which solves the problem that the luminous fluxes of the two paths of light in the traditional dual optical path quantum efficiency testing system are not equal, so that the standard detector and the sample to be tested are successively in the same optical path during measurement. The geometric position ensures that the standard detector and the incident light radiation flux on the sample surface are equal to improve the accuracy of the measurement results of the QE system

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