Importance

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Abstract

A method for manufacturing a photovoltaic cell, such as a solar cell is disclosed. The method includes: providing a silicon substrate; applying to a side of the silicon substrate, a first layer of a metal with a relatively high optical reflectance, such as a layer of silver; applying to the first layer, a second layer of a metal with a relatively high electrical conductivity coefficient, such as a layer of aluminum or an Al alloy; and then firing the substrate having the first and second layers in order to obtain an alloy of the metals of the first and second layers and the silicon, wherein the alloy formed comprises a maximum amount of metal dissolved in the silicon in amounts up to the eutectic point of the alloy. In one implementation, the alloy is substantially an n-type Si—Al—Ag alloy. Thus, an improved Back Surface Field is formed in the substrate. The invention further relates to a photo voltaic cell obtained with the aid of such method.

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First Claim