研究目的
To compare the performance of front contact grids based on Ag, Al, and Au applied to III?V multijunction solar cells from different perspectives, including price, mass-to-conductivity ratio, and abundance.
研究成果
Ag and Al grids are superior to Au grids in terms of cost-effectiveness. Ag grids showed the best performance with highest fill factor values, making them the most optimal choice for high-efficiency solar cells. Al grids, while the most cost-effective, showed inferior photovoltaic performance.
研究不足
The market values used represent examples with certain metal purity, thus the figures concerning cost-effectiveness should be considered as indicative. The inferior photovoltaic performance of Al could prevent its practical deployment in applications.
1：Experimental Design and Method Selection:
The study involved fabricating front contact grids on GaInP/GaAs/GaInNAsSb solar cells using Au, Al, and Ag. The grid functionality was evaluated through charge transport experiments under simulated sunlight.
2：Sample Selection and Data Sources:
The solar cells were grown on p-GaAs substrate with a Veeco GEN20 molecular beam epitaxy system.
3：List of Experimental Equipment and Materials:
Vecco GEN20 molecular beam epitaxy system, electron beam evaporation for metal deposition, resistive evaporation for Ag deposition, standard photolithography process for grid patterns.
4：Experimental Procedures and Operational Workflow:
The grids were fabricated on highly doped n-GaAs, with Ni used as an adhesion layer. The solar cells were characterized with I-V measurements under AM0 spectrum at one sun and under several concentrations.
5：Data Analysis Methods:
The performance was assessed in terms of current-voltage (I-V) characteristics and fill factors as a function of concentration.
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