Patent ID: 11929448
Assignee: SOUTH CHINA UNIVERSITY OF TECHNOLOGY
Field: Semiconductors (Electrical engineering)
Classification: CPC H  Y | IPC H

Claim 5:
6. An electric injection annealing test method for crystalline silicon photovoltaic solar cells, characterized in that, the method comprises the following steps:
turning on a temperature control device to keep a solar cell sheet at a constant temperature T;
placing the solar cell sheet on a sample test bench; connecting an electric circuit, injecting a current I into the solar cell sheet; and obtaining an initial electroluminescence image of the solar cell sheet;
maintaining the temperature T and current I unchanged, obtaining an electroluminescence image every time after a period of time until dark areas in electroluminescence images remain unchanged;
estimating a degradation time tdeg and a regeneration time tre through analyzing changes of the dark areas in the electroluminescence images with respect to time to obtain a corresponding degradation rate Rdeg and a regeneration rate Rre:
changing the temperature or the current, repeating the above steps to obtain long-term electroluminescence images of the crystalline silicon photovoltaic cells under different electrical injection annealing conditions to analyze the degradation rate Rdeg and the regeneration rate Rre under different electrical injection annealing conditions;
based on the degradation rate Rdeg and the regeneration rate Rre under the different electrical injection annealing conditions, analyzing effects of the temperature and the current on the degradation rate Rdeg and regeneration rate Rre.