Method for rapidly sintering solar wafer

Abstract

The invention provides a sintering method, and in particular relates to a method for rapidly sintering a solar wafer. A rapid thermal processing way is adopted to sinter large-area cells of silk-screen printing. The method comprises the following steps of: conveying, drying and exhausting cokes, rapidly heating to sinter as well as sintering at a high temperature and cooling. The method has the beneficial effects that the passivation effect is good, the minority carrier lifetime is improved greatly, the contact resistance of a Ag (silver) electrode and the quality of Al-BSFs (aluminum back surface fields) for the cells can be improved, the thermal stress is reduced, the contact resistances of solar cells are reduced obviously so as to improve the utilization of short wave spectra, the evenly good Al-BSFs are formed to improve the open-circuit voltages and filling factors of the cells, the warping of the cells is reduced, and the conversion efficiency and finished product ratio of the cells can be improved.

Description

technical field [0001] The invention relates to a sintering method, in particular to a method for rapid sintering of solar silicon wafers, which uses rapid heat treatment to sinter screen-printed large-area solar cells. Background technique [0002] At present, as an inexhaustible clean energy source, the development and utilization of solar energy is attracting great attention never before. Although people have carried out many years of research and development on various types of solar cells, so far, the solar cells that have achieved large-scale commercialization are still non-toxic crystalline silicon cells. In the production process of monocrystalline solar cells, "sintering" is a very important process, and the rapid sintering furnace is used in the production process. Its function is to sinter the electrode printed on the silicon wafer into a battery at high temperature, and finally make the electrode and the silicon wafer itself form an ohmic contact, thereby improv...

AI Technical Summary

Problems solved by technology

[0004] The current conventional sintering process can easily lead to excessive contact resistance of the positive electrode or the battery is burned through, and there is also the problem of poor hydrogen passivation effect, which reduces the minority carrier lifetime, resulting in low conversion efficiency.