Back electrode, solar battery, and preparation methods of back electrode and solar battery

Abstract

The invention discloses a back electrode, a solar battery, and preparation methods of the back electrode and the solar battery. The preparation method of the solar battery back electrode comprises thefollowing steps of preparing a photoresist layer on a substrate, preparing a plurality of first graving regions which penetrate through the thickness of the photoresist layer and are arranged at intervals on the photoresist layer, preparing an insulating layer on the surfaces of the substrate and the photoresist layer, preparing a nonmetal layer on the insulating layer, removing the photoresist layer and the insulating layer and the nonmetal layer on the photoresist layer by a cleaning process, preparing a back electrode layer on the substrate and the nonmetal layer, and removing the nonmetallayer and the back electrode layer on the nonmetal layer by a cleaning process. According to the method, division of the back electrode is completed by replacing laser graving with a photetching technology, so that damage of the laser graving to the substrate can be avoided; and insulating medium filling is performed in graving lines of the first graving regions (P1), so that the area of an deadregion can be reduced, the area of a power generation region can be increased, and the power generation efficiency can be improved.

Description

technical field [0001] The invention relates to the field of photovoltaic technology, in particular to a method for preparing a back electrode of a solar cell, a back electrode prepared by the method, a method for preparing a solar cell, and a solar cell prepared by the method. Background technique [0002] In the preparation process of existing copper indium gallium selenide thin film solar cells, metal molybdenum is usually used as the back electrode of the cell. In order to achieve high-voltage, low-current power output of CIGS battery components, laser or mechanical scribing is introduced to cut the back electrode, front electrode and other functional film layers, and divide the entire battery into multiple sub-battery units. There are series and parallel relationships among the sub-batteries. [0003] Laser or mechanical scribing is achieved by removing the corresponding film layer, so it will inevitably cause the scribed line area and the area between the scribed line...

AI Technical Summary

Problems solved by technology

[0007] Limited by the limitations of the existing technological level and the consideration of cost control factors, the width and accuracy of mechanical scribing can only be maintained at a certain level, and substantial improvements cannot be achieved in the short term

The laser scribing process has high requirements on the light transmittance of the substrate, laser type, laser energy, etc., and it is difficult to achieve effective improvement, and laser scribing will cause certain damage to the film layer and the substrate

[0008] Reducing the dead zone area and increasing the effective photoelectric conversion area is an important factor to improve the conversion efficiency of CIGS thin film solar cell modules. By reducing the width of laser and mechanical scribe lines and improving the precision to reduce the dead zone area, the short-term difficult to make much progress

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