A method for extracting solar cell parameters

Abstract

The invention discloses a method for extracting parameters of a solar cell, which is applied to the technical field of energy sources. The method comprises the following steps of: (1) measuring a dark volt-ampere characteristic curve of the solar cell; (2) measuring a dark conductance voltage characteristic curve and a dark differential conductance voltage characteristic curve of the solar cell; and (3) fitting the dark volt-ampere characteristic curve, the dark conductance voltage characteristic curve and the dark differential conductance voltage characteristic curve of the solar cell by adopting a theoretical formula to obtain series resistance, shunt resistance, an ideal factor and reverse saturation current of the solar cell, wherein the series resistance, the shunt resistance, the ideal factor and the reverse saturation current satisfy minimum standard deviations between experimental data and the theoretical formula. Compared with the traditional method of only relying on a single volt-ampere characteristic (or conductance voltage characteristic) curve under illumination to fit and extract parameters of the solar cell, the method disclosed by the invention has the characteristics of higher accuracy and stronger applicability.

Description

technical field [0001] The invention relates to a parameter extraction method, in particular to a solar cell parameter extraction method. Background technique [0002] The extraction technology of solar cell parameters (series resistance, parallel resistance, ideality factor and reverse saturation current) has been extensively studied in the field of photovoltaics, because these parameters are an important basis for measuring the quality of solar cells and specific indicators for measuring their photoelectric conversion efficiency . At present, the usual method is to extract parameters according to the volt-ampere characteristic curve fitting of solar cells under illumination [(Zha Ju et al., Acta Solar Energy Sinica, 2007.28 (9): 992), (Adelmo Ortiz-Conde, et al.. Solar Energy Materials & Solar Cells 2006.90: 352), (Li Buyin, etc., a solar cell parameter testing device, utility model patent number: CN101551437B)], but because the theoretical equation describing the solar c...

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Problems solved by technology

At present, the usual method is to extract parameters according to the volt-ampere characteristic curve fitting of solar cells under illumination [(Zha Ju et al., Acta Solar Energy Sinica, 2007.28 (9): 992), (Adelmo Ortiz-Conde, et al.. Solar Energy Materials & Solar Cells 2006.90: 352), (Li Buyin, etc., a solar cell parameter testing device, utility model patent number: CN101551437B)], but because the theoretical equation describing the solar cell under light includes multiple parameters such as series resistance, it is easy to appear due to volt The accidental error of a certain measurement data in the safety characteristic curve affects the fitting result; and because the volt-ampere characteristics of the solar cell are affected by the stability of the light source under the light condition, it is easy to cause the error of the measurement data due to the change of the light intensity, which leads to the extracted sun There is an error in the battery parameters

There is also a method of extracting solar cell parameters using the conductance-voltage characteristic curve [Z. Ouennoughi, Solid-State Electronics 1999.43: 1985]. This method is also susceptible to accidental errors in the iterative extraction of parameters by only one characteristic curve, thereby reducing the extraction efficiency. precision of results

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