The device for quality analysis of solar cells with different sensitive surface areas using radiation from a non-mechanical planar system is described. Current solutions for quality analysis of solar cells have disadvantages: work with analogy data, large dimensions of mechanical focusing system, interaction with small areas active zone of solar cells without possibility of identifying point pattern efficiency. Accordingly, a method is proposed for measuring the efficiency of solar cells at the production stage and during the operational period, which makes it possible to identify places of its insensitivity with the possibility of obtaining quantitative data on efficiency for the purpose of their mathematical processing. The developed photo scanning control device can be suitable for solar cells diagnostics with a sensitive zone area from 9 mm2 to A5 sheet size. The method makes it possible to measure local photocurrent and to find places of solar cell shunting.
Process of diagnostics is controlled by one personal computer, which performs functions of controlling illumination of a monitor, setting diagnostic modes, obtaining data on the efficiency of the solar cells, storing and processing them. The device can be based on a laptop and is considered as mobile. Special software is used to manage, visualize and process the output data in a form of a rectangular matrix. An experiment was carried out on artificial darkening of the working areas of solar cells of different sensitivity. This confirmed effect of data changes and a visual display of obscuring zone on the output results. Tests were carried out on solar cells based on polycrystalline silicon. The results showed a high level of visibility and repeatability of the darkened area, and the quality of the data obtained made it possible to identify a small measurement error associated with external “noise”.
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• diagnostics
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• olar battery
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• photo scanning method
• semiconductor
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