When using thinner polysilicon films, be faced with a problem is the quality of the surface of the composite with the base material. Experiments confirmed using SiNx as the front surface passivation layer and Al as the back of the field (BSF), when the polysilicon film thickness greater than 200um, Jsc and silicon thickness is independent of the relationship, only the silicon thickness of less than 200um , Jsc was reduced with the reduction of the thickness. BSF can hinder the photogenerated minority carriers support or oppose the surface of movement, reducing back surface recombination, p / n junction on the carrier collection.
Low thickness, the matrix of the incident light absorption to reduce the BSF solar cell short-circuit current density is even more obvious. SiNx as a front surface passivation layer to reduce surface recombination and improve the quality of the base material. However, when the silicon thickness is very low, low low-energy photons will pass through the silicon can not be absorbed, Jsc decreased.
Silicon thickness of the open circuit voltage (Voc)
AL-the BSF in the back of the polycrystalline silicon solar cells, silicon thickness is greater than 200um, open circuit voltage (Voc) and silicon thickness is an independent relationship. Thick silicon wafer, Voc is independent of silicon thickness.
Third, the efficiency of silicon thickness
Silicon thickness is greater than 200um, AL-the BSF polycrystalline silicon solar cell efficiency is independent of each other with the silicon thickness. Thickness of less than 200um silicon wafer, solar cell efficiency of the high base quality is reduced as the thickness decreases, the low base quality solar cell efficiency is still constant.
Standard industry out of step, 200um thickness of the silicon wafer is the starting point of the polycrystalline silicon solar cell reduced performance. When the polysilicon film thickness of less than 200um, the main electrical parameters of the polycrystalline silicon solar cells started to decrease. Reduce silicon thickness to reduce the cost of photovoltaic, to use the effective surface passivation to reduce surface recombination and to improve the quality of the base region.
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