Analysis of Temperature Coefficient for Crystalline Silicon Solar Cells and Hydrogen Passivation by Plasma Immersion Ion Implantation
Date Issued
2009
Date
2009
Author(s)
Liao, Jyong-Fong
Abstract
In this these, we mainly worked on performance analyses of the commercial monocrystalline and multicrystalline silicon solar cells. The efficiency, short-circuit current, open-circuit voltage and fill factor can be extracted for solar cells with Endeas QuickSun 120CA solar simulator. In addition to the standard AM1.5G condition, we simultaneously investigate in detail other factors including leakage effect and temperature effects.First of all, we introduce some basic structure and principles of solar cell, and then by using X-ray photoelectron spectroscopy (XPS) to analysis the composition of metal lines and antireflection coating layer. The relation between leakage current and efficiency, short-circuit current, open-circuit voltage and fill factor are investingated Besides, the characteristics of temperature dependence have experimental measurements and theoretical analysis.ccording to the previous temperature experiment, the temperature coefficient of multicrystalline silicon differs from monocrystalline silicon. Especially, on temperature coefficient of short-circuit current. As a result, the efficiency dropping for monocrystalline is more serious than multicrystalline on elevated temperature process. The reason we have derived from the temperature coefficient of resistivity for both type substrates are different result in different current temperature coefficient. he process of crystalline solar cell can corporate with plasma immersion ion implantation (PIII) technique. The method is to repair surface defect and edge defect in solar cell by implanting hydrogen ions. By adjusting implantation energy and time we can achieve optimum efficiency improvement. Besides, ISE simulations for solar cell show the relations of surface recombination velocity versus Isc, Voc, F.F and efficiency.
Subjects
solar cell
temperature coefficient
PIII
Type
thesis
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