Preparation method of nano low-silver high-efficiency positive silver conductor paste for crystalline silicon solar energy

Abstract

The invention discloses a preparation method of nano low-silver high-efficiency positive silver conductor paste for crystalline silicon solar energy, and the method comprises the following steps: S1)preparing nano silver powder: dropwise adding a saturated silver nitrate and PVP mixed solution into a sodium borohydride solution, performing stirring in a water bath at 30-55 DEG C, performing centrifuging, performing washing with alcohol, and performing drying at a low temperature of 25-30 DEG C and a negative pressure to obtain the nano silver powder; adding a catalyst at 180 + / -5 DEG C for thermal decomposition to obtain silver powder with the particle size of 5-70nm; S2) preparing an organic carrier; S3) preparing nano-silver conductor paste. According to the method, self-made nano silver powder is used for replacing micron-sized silver powder in existing positive silver conductor paste, the microstructure of the silver conductor paste is changed due to reduction of the particle sizeof silver, and therefore the conductivity, the printing performance and the crystalline silicon substrate adhesion performance of the paste are changed, and printed conductor lines have the excellentheight-width ratio; the lines tend to be semitransparent, so that the light transmittance is improved, the photoelectric conversion efficiency is improved, and the application of the positive silverconductor paste in crystalliane silicon solar energy is greatly expanded.

Description

Technical field: [0001] The invention belongs to the field of electronic paste, and relates to a nanometer low-silver high-efficiency conductor paste and a preparation method thereof, in particular to a nanometer low-silver high-efficiency conductor paste suitable for the field of crystalline silicon solar photovoltaic manufacturing and a preparation method thereof. Background technique: [0002] At present, with the acceleration of the world's energy consumption, non-renewable energy has gradually decreased. Human beings are already developing wind energy, water energy, nuclear energy and solar energy. Among them, the development and utilization of solar energy is the most environmentally friendly, effective and resource-rich. Among them, the current major crystalline silicon solar photovoltaic projects are progressing most rapidly. Among them, the main components of the applied front silver paste include functional phase silver powder, inorganic binder (such as glass powde...

AI Technical Summary

Problems solved by technology

At present, the silver powder used by the positive silver has two disadvantages. One is that silver micropowder is mostly used, that is, the silver powder is mostly micron silver powder, and the fineness of the paste made is relatively rough, resulting in a thicker film layer during the printing process. Poor compactness produces holes, poor printing performance, and small line height-width ratio, which affects the photoelectric conversion performance. Second, its high silver powder content consumes a lot of precious metal silver, which makes the industrial production cost of crystalline silicon solar photovoltaic devices Therefore, it is particularly important to develop a low-silver, high-efficiency, high-performance crystalline silicon solar front-side silver conductor paste

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