A device for homogenizing direct-writing solar cell electrodes

Abstract

The invention discloses a device for homogenizing direct-writing solar cell electrodes, which belongs to the field of advanced manufacturing technology. Including pressure supply module, nozzle module, motion control module and vision module. The pressure supply module includes a syringe pump and an electrode slurry spray chamber; the nozzle module includes a transition tank, a homogenizing device located at the lower end of the transition tank and an auxiliary drive clamping device; the motion control module includes an X‑Y motion platform, a Z displacement axis and its control device; the vision module includes an industrial camera, a host computer and an auxiliary lighting device. The invention adopts the method of direct writing forming to prepare solar cell electrodes, which can prepare electrode structures with a line width of less than 50 μm, an aspect ratio of more than 0.5, and good shape uniformity, which is conducive to improving the photoelectric conversion efficiency of solar cells; at the same time, its non-contact The advanced forming process reduces the consumption of electrode slurry and silicon materials, which is beneficial to reduce the manufacturing cost of solar cells; real-time stirring of the electrode slurry can avoid clogging of the nozzle holes and ensure the stability of the electrode forming process.

Description

technical field [0001] The invention belongs to the field of advanced manufacturing technology and relates to a device for homogenizing direct-writing solar cell electrodes. Background technique [0002] Solar cells can directly convert solar energy into electricity and are an important source of clean energy. At present, the development of crystalline silicon solar cells is the most mature. A conventional crystalline silicon solar cell is mainly composed of a silicon substrate, a front electrode and a back electrode. When sunlight irradiates the PN junction of the silicon substrate, the electron transition near the PN junction is excited, and hole-electron pairs are generated. The electrons are collected by the front electrode, and the holes move to the back electrode, and the front electrode and the back electrode are connected to the circuit. That is, a current is formed. [0003] The electrode is the key structure of the solar cell, mainly an array grid structure with...

AI Technical Summary

Problems solved by technology

[0004] At present, screen printing technology is widely used to prepare solar cell electrodes. The obtained electrode line width is more than 50 μm, the aspect ratio is less than 0.5, and the surface of the electrode grid line also has the problem of unevenness.

Such electrode morphology severely limits the further improvement of the photoelectric conversion efficiency of solar cells.

In addition, due to screen printing, it will cause the electrode paste to stick to the screen, resulting in unnecessary loss of electrode paste

Moreover, due to contact printing, in order to reduce the fragmentation rate, the thickness of the silicon substrate cannot be further reduced, which limits the reduction of solar cell manufacturing costs

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