Ag Contact Properties According to the Front Grid Width and Firing Temperature for Silicon Solar Cells

The front electrode is usually made by the screen printing thick-film silver pastes and the high-temperature firing process in industrial production of silicon solar cells. This paper analyzed the ohmic contact mechanism of thick-film front silver electrodes and studied the microstructure of Ag-Si interface by SEM. The paste samples, used to form front silver electrodes of silicon solar cells, were prepared. Thick-film silver electrodes were printed on silicon wafers with different sheet resistances, and the relationships between the sheet resistances and the contact properties were investigated by changing the firing temperature. By adding right amount of phosphorus compounds to the silver paste, the effects of the donor-doping (N-doping) concentrations on the series resistance of cells were studied. The experimental results show that firing temperature is critical to the Ag-Si ohmic contact, particularly when the silver pastes are designed for the wafers with high sheet resistance and the right amount of N-doping addition in the paste may decrease the series resistances of solar cells.

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Characterization of Nickel Silicide Formation by a Selective Electroless Plating Process for Crystalline Silicon Solar Cells

Korean Journal of Metals and Materials ◽

10.3365/kjmm.2016.54.6.415 ◽

2016 ◽

Vol 54 (6) ◽

pp. 415-422

Author(s):

Soo Hong Lee ◽

Atteq ur Rehman ◽

Eun Gu Shin ◽

Sang Hee Lee ◽

Doo Won Lee

Keyword(s):

Solar Cells ◽

Electroless Plating ◽

Crystalline Silicon ◽

Nickel Silicide ◽

Silicon Solar Cells ◽

Silicide Formation ◽

Crystalline Silicon Solar Cells

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Kinetics of Light-Induced Effects in Mixed-Phase Hydrogenated Silicon Solar Cells

MRS Proceedings ◽

10.1557/proc-762-a12.2 ◽

2003 ◽

Vol 762 ◽

Cited By ~ 1

Author(s):

Guozhen Yuea ◽

Baojie Yan ◽

Jeffrey Yang ◽

Kenneth Lord ◽

Subhendu Guha

Keyword(s):

Solar Cells ◽

Fill Factor ◽

Equivalent Circuit Model ◽

Open Circuit ◽

Mixed Phase ◽

Silicon Solar Cells ◽

Initial Increase ◽

Soaking Time ◽

Hydrogenated Silicon ◽

Kinetics Of

AbstractWe have observed a significant light-induced increase in the open-circuit voltage (Voc) of mixed-phase hydrogenated silicon solar cells. In this study, we investigate the kinetics of the light-induced effects. The results show that the cells with different initial Voc have different kinetic behavior. For the cells with a low initial Voc (less than 0.8 V), the increase in Voc is slow and does not saturate for light-soaking time of up to 16 hours. For the cells with medium initial Voc (0.8 ∼ 0.95 V), the Voc increases rapidly and then saturates. Cells with high initial Voc (0.95 ∼ 0.98 V) show an initial increase in Voc, followed bya Voc decrease. All light-soaked cells exhibit a degradation in fill factor. The temperature dependence of the kinetics shows that light soaking at high temperatures causes Voc increase to saturate faster than at low temperatures. The observed results can be explained by our recently proposed two-diode equivalent-circuit model for mixed-phase solar cells.

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