Glass powder composition, and conductive paste comprising glass powder composition and preparation method therefor

By using a glass powder composition with a specific composition to prepare a conductive paste with silver powder and an organic carrier, the ohmic contact and metal recombination problems in the p+poly silicon region of TBC cells were solved, thus improving the efficiency of solar cells.

WO2026103791A1PCT designated stage Publication Date: 2026-05-21HERAEUS PHOTOVOLTAICS TECHNOLOGY (SHANGHAI) CO LTD
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Patent Information

Authority / Receiving Office
WO · WO
Patent Type
Applications
Current Assignee / Owner
HERAEUS PHOTOVOLTAICS TECHNOLOGY (SHANGHAI) CO LTD
Filing Date
2025-11-13
Publication Date
2026-05-21

AI Technical Summary

Technical Problem

Existing conductive pastes struggle to achieve a good balance between ohmic contact and metal composite performance in the p+poly silicon region of TBC cells, especially due to insufficient wetting ability and uneven contact point distribution caused by the small thickness and smooth surface of p+poly silicon.

Method used

A glass powder composition with a specific composition, comprising a first glass powder and a second glass powder, is used to form a conductive paste with silver powder and an organic carrier in a certain proportion. This paste is used to prepare electrodes for crystalline silicon solar cells, and ohmic contacts and metal composites are formed by sintering.

Benefits of technology

A good balance between ohmic contact and metal recombination performance of conductive paste in the p+poly silicon region of TBC cells was achieved, thus improving the efficiency of solar cells.

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Patent Text Reader

Abstract

The present invention relates to a glass powder composition. The glass powder composition comprises: a) 40-80 wt% of a first glass powder, and b) 20-60 wt% of a second glass powder, wherein the first glass powder comprises 2-9 wt% of an alkali metal oxide, 1-5 wt% of SiO2, 8-20 wt% of Bi2O3, 25-50 wt% of TeO2, 20-45 wt% of PbO, 0-10 wt% of WO3, 0-5 wt% of MoO3, and 0-5 wt% of ZnO, the weight percentage being based on the total weight of all the compounds in the first glass powder; and the second glass powder comprises 5-15 wt% of an alkali metal oxide, 5-12 wt% of SiO2, 8-20 wt% of Bi2O3, 20-40 wt% of TeO2, 20-40 wt% of PbO, 0.1-7 wt% of Ag2O, 0.1-7 wt% of a lanthanide compound, 0-10 wt% of WO3, 0-5 wt% of MoO3 and 0-5 wt% of ZnO, the weight percentage being based on the total weight of all the compounds in the second glass powder. The present invention further relates to a conductive paste comprising the glass powder composition.
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