Composition for manufacturing a back contact for a crystalline solar cell

Abstract

The present invention relates to a composition for manufacturing a back contact for a crystalline solar cell. The back contact material used for manufacturing a crystalline solar cell, a front contact and back contact of which are formed on the front side and rear side of a wafer, respectively, comprises a mixture composition consisting of an acrylate- or cellulose-based resin, aluminum powder, an inorganic binder, and an additive for increasing adhesion to a wafer, wherein the aluminum powder is a powder mixture containing aluminum powder, the size of which is 30-100 nm, and aluminum powder, the size of which is 2-10 [mu]m. The composition of the present invention uses said types of aluminum powder, the sizes of which are smaller than those disclosed in prior art, thereby reducing Rs-contact resistance and thus enabling a solar cell to have excellent photoelectric conversion efficiency.

Description

technical field [0001] The present invention relates to a composition for manufacturing the rear electrode of a crystalline solar cell, in particular to a rear electrode material for the manufacture of a high-efficiency solar cell. Resistance (Rs_contact resistance) value, so it can have significantly excellent photoelectric conversion efficiency (Efficiency). Background technique [0002] Generally speaking, as a semiconductor element that directly converts sunlight energy into electricity, crystalline solar cells mainly use silicon materials, such as figure 1 As shown, it basically consists of the following structures: a silicon wafer (10), forming a p-n junction structure; an anti-reflection film (20), formed on the above-mentioned silicon wafer (10), which can make the light well received by the solar cell internal absorption; the front electrode (30) and the rear electrode (40) are respectively printed and laminated on the upper and lower sides of the above-mentioned s...

AI Technical Summary

Problems solved by technology

[0008] However, the rear electrode material for manufacturing high-efficiency solar cells composed of the above-mentioned mixed composition has a problem of insufficient photoelectric conversion efficiency (Efficiency) due to the high value of series resistance (Rs_contact resistance)

[0009] In addition, in order to improve the efficiency of crystalline solar cells, it is necessary to further reduce the bowing phenomenon without reducing the photoelectric conversion efficiency. However, as the above-mentioned rear electrode material, there is a problem that the bowing phenomenon cannot be further reduced.

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