A sub-junction analysis method of a solar cell structure containing a complete multi-junction compound

Abstract

The invention discloses a sub-junction analysis method for a solar cell structure containing a complete multi-junction compound, which comprises the following steps of: virtually cutting off the leftside and the right side of other sub-junctions to ensure that anodes and cathodes of the other sub-junctions are just positioned in doping regions on the two sides of a single-junction cell structure;Obtaining a simulation structure chart of each sub-junction; Obtaining a curve graph of the change of the performance of each sub-junction along with the trap density of the material in the absorption region; Determining the trap density required by the short-circuit current which is the same as the experimental measurement value of each sub-junction, determining the sensitivity of each sub-junction to the trap capture cross section, and determining the current limiting junction; Adjusting trap parameters of other sub-junctions to enable the final open-circuit voltage to be the same as the experimental value; Carrying out simulation fitting on the whole experimental measurement result; And analyzing the relationship between the fitting defect density of the other sub-junctions and the defect density required for reaching the limited current, and optimizing the sub-junctions which are not reached. The method provided by the invention is simple and can accurately reflect the real behavior of each sub-junction in the complete battery.

Description

technical field [0001] The invention relates to the technical field of solar cells, in particular to a sub-junction analysis method including a complete multi-junction compound solar cell structure, which has a simple method and can accurately reflect the real behavior of each sub-junction in a complete battery. Background technique [0002] Simulation analysis is an effective method for multi-junction solar cell research. At present, the means of simulation and analysis of multi-junction solar cells is mainly based on the separate simulation of sub-junctions. Specifically, with the help of software such as PC1D AMPS and APSYS, a separate numerical simulation based on semiconductor drift and diffusion theory is carried out for each sub-junction, and each sub-junction is analyzed. The performance of the sub-junction battery is affected by changes in material properties, such as the impact of the minority carrier lifetime of the material on the I-V curve of the sub-junction, a...

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Problems solved by technology

[0005] 1. On the one hand, the current method is relatively cumbersome. It is necessary to conduct separate simulation analysis of each sub-junction solar cell and then integrate the complete multi-junction solar cell to analyze the overall performance. This kind of split work is not intuitive enough for simulation. Moreover, when analyzing the interaction of light absorption between sub-junctions, it cannot be done in one step, which is very inefficient. Furthermore, it is not convenient for mass analysis of multi-junction solar cells, especially four-junction or even more junctions. ;

[0006] 2. On the other hand, it is especially important that since sunlight is incident into a multi-junction solar cell, it is a series of linkage behaviors. This separate simulation analysis cannot accurately reflect the real behavior of each sub-junction in a complete cell. When simulating a complete multi-junction structure, it is also difficult to directly evaluate whether the current-matching and other conditions between the sub-junctions have been achieved to achieve the best battery performance.

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