研究目的
To analyze the influence in the electrical parameters of different metal pastes used to form the contact with the boron back surface field of PERT solar cells passivated with silicon dioxide on both sides and developed with a cost-effective process.
研究成果
The aluminum paste (PV381) is more effective to form the selective back surface field, achieving higher open circuit voltage and efficiency. The silver/aluminum paste (PV3N1) also showed good performance but with slightly lower VOC. The silver paste (PV51G) is not suitable for rear contact due to high series resistance.
研究不足
The PV51G silver paste produced solar cells with low fill factor, indicating high series resistance and is not suitable for rear contact formation. The study is limited to the analysis of three specific conductive pastes and their performance in PERT solar cells.
1：Experimental Design and Method Selection:
The study involved processing solar cells with three different conductive pastes to form the contact with the boron back surface field. The boron doped BSF and phosphorus emitter were carried out with reduction of steps.
2：Sample Selection and Data Sources:
Solar grade p-type Si-Cz wafers with 100 mm diameter, thickness of (200±30) μm, orientation of the lattice planes {100} and resistivity from 1 Ω.cm to 20 Ω.cm were used.
3：List of Experimental Equipment and Materials:
Conductive pastes (PV381, PV3N1, PV51G) produced by DuPont, KOH, isopropyl alcohol, deionized water, RCA wet-chemical cleaning solutions, PBF20 from Filmtronics, POCl3, hydrofluoric acid, titanium dioxide.
4：Experimental Procedures and Operational Workflow:
The wafers were textured, cleaned, boron and phosphorus diffused, oxidized, etched, and metal grids were screen-printed on both faces. The pastes were fired at optimized temperatures.
5：Data Analysis Methods:
The electrical parameters (JSC, VOC, FF, η) of the solar cells were measured under standard conditions using a solar simulator.
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