LED excited solar cell photoluminescence detection device

Abstract

The invention relates to a silicon chip and solar cell photoluminescence detection device, especially to a photoluminescence detection device for realizing uniform excitation radiation by the utilization of a plurality of LED light source modules (5). The device provided by the invention is composed of a CCD camera (3), a long-wavelength pass filter (4), a data acquisition computer (1), an acquisition card (2), light source modules (5) and a driving power (6). Luminescent sources used by the light source modules (5) are monochromatic large power light emitting diodes (LEDs). The light source modules are symmetrically installed sidelong above a solar cell slice (7) relative to the central normal of the measured solar cell slice (7). Irradiation rays of the symmetrically-installed light source modules (5) are superposed mutually on the surface of the solar cell slice (7) to form uniform irradiation excitation radiation. Wavelength of the LEDs for the light source modules can be independently selected according to needs. The device provided by the invention is adopted to mainly solve problems of complex structure, poor irradiation uniformity, high maintenance cost and the like which are caused by laser used as an excitation light source in a disclosed scheme, and has advantages of convenient maintenance, selectable excitation wavelength, freely-adjustable irradiance level and the like.

Description

technical field [0001] The invention relates to a silicon wafer and solar cell photoluminescence detection device, in particular to a silicon wafer and solar cell photoluminescence detection device which utilizes a plurality of LED light source modules to realize uniform excitation radiation. Background technique [0002] In recent years, the solar cell industry has achieved rapid development in my country. In the production process of solar cells, how to quickly detect its quality in each link is an important issue. The photoluminescence detection method uses light to irradiate the photovoltaic cell material to excite the electrons in the material to a high energy level, and when the high energy level electrons transition to a low energy level, photons are emitted, resulting in photoluminescence. By observing the photoluminescence of the material, various information such as the minority carrier diffusion length of the material, the surface resistance distribution, and the...

AI Technical Summary

Problems solved by technology

Although the Chinese invention patent application 201010510730.8 "Solar Cell Defect Detection Method" requires a laser controller to adjust the wavelength of the laser beam within the wavelength of 0-900nm, the existing technology is not yet practical, because the laser wavelength is determined by the characteristics of the working medium itself Determined, the wavelength range adjusted by the controller is limited

Images