FUZZY MODEL OF SOLAR CELL QUALITY IN CORONA DISCHARGE
[3. Технічні науки]
Автор: Bozhko Kostyantin M.; Bochkova Olha P.,National Technical University of Ukraine “Igor Sikorsky Kyiv Polytechnic Institute”, Kyiv
Lock-in Thermography (LIT) and Electroluminescence (EL) are to determine the degree of degradation of solar cells . The author proposes to supplement these methods with the visualization of defects in a corona discharge (Fig. 1).
The area of the contact is 2/3 square inch. A sign a defect is its glow the corona discharge. Defects are located between the buses. Glow above the buses is now is a sign of a defect. The width of the buses is 100 microns.
All defects divided into small and large. Small defects is nevertheless as 100 microns. Large defects is all others. According to the number of defects per square inch, the authors determined the degree of defects of the solar cell (Table 1).
Table 1 – Degree of defects of solar cell
Defect density is ranges based on Fibonacci numbers. Solar sell (Fig.1) is 16 large and 28 small defects. Density of defects is 42 per square inch for small and 24 for large.
Solar cell (Fig. 1) is high degree of defects (bused of Table 1). In 100-balls scale for fuzzy model of solar cell quality authors to receive quality in 49.6 balls (Fig. 2).
A feature of input functions is the integer set of their values. For 100-ball scale the minimum score is 14.6 and maximum is 85.4.
1. Naumann V. Micro Structural Root Cause Analysis of Potential Induced Degradation in c-Si Solar Cells / V. Naumann , C. Hagendorf , S. Grosser , M. Werner , J. Bagdahn. //SiliconPV: April 03-05, 2012, Leuven, Belgium. – 6 р. doi: 10.1016/j.egypro.2012.07.020.