研究目的
Investigating the mapping of bulk diffusion length and effective back surface recombination velocity in silicon solar cells to understand their impact on cell efficiency.
研究成果
The study successfully demonstrated the mapping of diffusion length and surface recombination velocity in silicon solar cells, revealing significant variations between mono-crystalline and multi-crystalline cells and between different passivation technologies. The findings highlight the importance of bulk material quality and back surface passivation in determining cell efficiency.
研究不足
The study is limited to Al-BSF and PERC silicon solar cells. The methodology requires specific conditions for wavelength selection and assumes certain material properties (e.g., diffusion coefficient of electrons). The analysis is post-fabrication, which may not capture all in-process variations.
1：Experimental Design and Method Selection:
Utilized spectral response (SR) at desired wavelengths and light beam induced current (LBIC) technique for mapping. MATLAB tool was developed for data conversion and analysis.
2：Sample Selection and Data Sources:
Four cells of conventional size 6”x6”, namely mono-crystalline Al-BSF (M1), mono-crystalline PERC (M2), multi-crystalline Al-BSF (N1), and multi-crystalline PERC (N2), were used. Additionally, three multi-crystalline Al-BSF industrial Si solar cells (A, B, C) of varied efficiencies were investigated.
3：List of Experimental Equipment and Materials:
LBIC tool of SemiLab (WT-2000PVN), solar simulator (ABET technologies, Sun3000), photoluminescence (PL) imaging using Greateyes LumiSolarCell.
4：Experimental Procedures and Operational Workflow:
Generated spatially distributed data of IQE and R in steps of 500 μm corresponding to excitation wavelengths 877 nm and 984 nm on the full area of solar cell. MATLAB tool was used for computation and analysis.
5：Data Analysis Methods:
Equations for computing L and SRV were applied using MATLAB. PL images were processed using MATLAB to analyze the effect of defects and passivation quality.
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