研究目的
To develop and optimize screen-printable aluminum pastes with and without boron content for improving the quality of back surface fields in crystalline silicon solar cells, aiming to enhance their efficiency.
研究成果
Screen printable aluminum pastes with and without boron content were developed for crystalline silicon solar cells, showing improved carrier lifetimes after alloying. The boron-free aluminum paste provided better solar cell performance, achieving a best conversion efficiency of 17.8%. The findings suggest that boron content in aluminum pastes can improve the bulk quality of silicon solar cells, but further investigation is needed to enhance their efficiency in solar cell fabrication.
研究不足
The study did not extensively investigate the dispersion of boron element into the gas phase during the firing process, which could affect the solar cell performance. Additionally, the performance of boron-doped aluminum pastes in solar cell fabrication needs further optimization for higher efficiencies.
1：Experimental Design and Method Selection:
The study involved the development of two types of aluminum pastes (with and without boron content) for screen-printing on silicon wafers. The pastes were optimized in terms of their ingredients and processing conditions to achieve desired alloying and impurity characteristics.
2：Sample Selection and Data Sources:
Silicon wafers were used as the substrate for paste application. The wafers underwent polishing and cleaning processes before paste application and thermal processing.
3：List of Experimental Equipment and Materials:
Aluminum powders of various sizes, aluminum oxide powder, ethanol, α-terpineol, ethyl cellulose, and boric acid were used. Equipment included ultrasonic homogenizer, evaporator, and rapid thermal annealing (RTA) furnace.
4：Experimental Procedures and Operational Workflow:
The pastes were screen-printed on silicon wafers and fired at 870°C. The wafers were then characterized for sheet resistance, carrier lifetime, and impurity profiles using SIMS analysis.
5：Data Analysis Methods:
The performance of the pastes was evaluated based on sheet resistance measurements, carrier lifetime estimations, and SIMS analysis to understand the alloying and gettering effects.
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