Glass plate used for film solar battery and its preparation method

Abstract

The invention provides a glass plate used for a film solar battery and its preparation method. The glass plate used for the film solar battery comprises the following components by weight percentage: 50-59% of SiO2, 15-18% of Al2O3, 1-4% of B2O3, 0-8% of Na2O, 3-10% of K2O, 0-2% of MgO, 0-9% of CaO, and 6-10% of BaO and 3-7% of SrO, wherein the total amount of Na2O and K2O is 5-12%, and the total amount of MgO, CaO, SrO and BaO is 12-20%. The glass plate has characteristic of good thermal expansion coefficient, the thermal expansion coefficient is 75-85*10<-7> / K in the temperature scope of 50-350 DEG C. When the glass plate is used for preparing a CIGS solar film at the temperature higher than 620 DEG C, the glass plate can be matched and tightly combined with the CIGS solar film under the high temperature.

Description

【Technical field】 [0001] The invention relates to a glass plate and a preparation method thereof, in particular to a glass plate used for a thin-film solar cell and a production method thereof. 【Background technique】 [0002] As a clean and renewable energy source, the importance of solar photovoltaic power generation has been gradually valued by countries all over the world, and various solar cell technologies are also emerging. Among many solar cell technologies, CIGS (CuInGaSe, Copper Indium Gallium Zinc) thin-film cell has rapidly increased its market share in the solar cell market due to its advantages of low cost, high stability, and large conversion efficiency improvement space. The growing market share and continuous technological improvement have made the market demand for CIGS battery substrate glass substrates more and more, and the performance requirements for glass are more stringent. The soda-lime-silica glass used in CIGS had a low strain point temperature, a...

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Problems solved by technology

[0005] Ordinary soda-lime-silica glass is generally used as substrate glass, but the strain point temperature of soda-lime-silica glass is only about 510°C, and the heat resistance stability is only about 125K, which makes it difficult to meet the requirements of improved technology.

Borosilicate glass is also selected as the substrate glass. Although it has the advantages of light weight, compact structure, and high heat resistance stability, the production process of flat borosilicate glass is complicated and difficult to meet large-scale production. More importantly, flat borosilicate glass The thermal expansion coefficient of borosilicate glass is usually 40×10 -7 Below / K, it is too different from the CIGS thin film, and it is easy to generate stress during the preparation process, which will affect the subsequent processing.