Thin-film solar cell and manufacturing method therefor

Abstract

Provided is a thin-film solar cell (1) that has, on a substrate, a plurality of unit solar cells (3) that are partitioned by scribe lines (2) and that contain: first electrode layers comprising a transparent conductive material; photoelectric conversion layers; and second electrode layers containing a conductive material that reflects light. The second electrode layer between scribe lines (2) formed in the photoelectric conversion layer is electrically connected to the first electrode layer of an adjacent unit solar cell, thus electrically connecting the plurality of unit solar cells (3) in series. For at least one of the unit solar cells (3), the scribe lines (2) on both sides are formed such that the unit solar cell (3) sandwiched therebetween zig-zags in a prescribed direction with constant width, and both scribe lines have the same shape, which would overlap if moved in parallel in the prescribed direction.

Description

technical field [0001] The invention relates to a thin-film solar cell and a manufacturing method thereof. Background technique [0002] Solar power generation system as protection of the global environment in the 21st century from CO caused by burning fossil energy 2 The clean energy of the influence of the increase of the gas is expected, and the production amount thereof is explosively increased in the world. Therefore, a shortage of silicon wafers occurs in the world. Therefore, in recent years, the production volume of thin-film solar cells in which the photoelectric conversion layer (semiconductor layer) is formed of a thin film has rapidly increased without being restricted by the supply amount of silicon wafers. [0003] In thin-film solar cells, transparent electrodes and photoelectric conversion layers of thin films are directly formed on a substrate with a large area of ​​about one meter square by sputtering, evaporation, and CVD (Chemical Vapor Deposition: Chem...

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Problems solved by technology

[0007] In addition, even if the width of the unit cell is enlarged and reduced and most of the current flows through the short current path in the transparent electrode to reduce the overall resistance loss as in Patent Document 1, there are disadvantages such as the following: Compared with the case where the scribed track forms a unit cell, the current path in the transparent electrode sometimes becomes longer in the part where the width of the unit cell is enlarged; In the part where the electric field intensity becomes high, the Joule loss becomes large; in the case of making the width of the unit cell expand and shrink as in Patent Document 1, it is necessary to set the minimum width of the unit cell to a positive value, so Compared with the case of forming a unit cell with scribed lanes parallel to each other, the scribed lanes cannot be bent too much

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