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Conductive Thick Film Paste For Solar Cell Contacts

a solar cell and conductive film technology, applied in the field of electroconductive pastes, can solve the problem of high recombination in the contact area

Inactive Publication Date: 2013-10-17
HERAEUS PRECIOUS METALS NORTH AMERICA CONSHOHOCKEN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention provides an electroconductive paste composition for use in solar cells. The composition includes a lead containing matrix forming composition and a tellurium oxide additive. The lead containing composition can be a glass frit with an amorphous structure or crystalline phases or compounds. The composition can also include metallic particles, an inorganic reaction system, and an organic vehicle. The organic vehicle can include a binder, a surfactant, an organic solvent, and a thixatropic agent. The composition can be applied to a silicon wafer and fired to produce a solar cell. The invention also provides a method of producing a solar cell by applying the electroconductive paste to a silicon wafer and firing it according to an appropriate profile. The invention also provides a solar cell module comprising electrically interconnected solar cells made with the electroconductive paste.

Problems solved by technology

Known compositions have high contact resistance due to the insulating effect of the glass in the interface of the metallic layer and silicon wafer, as well as other disadvantages such as high recombination in the contact area.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0049]As shown in Table 1, exemplary electroconductive pastes T1-T4 were prepared with an IRS comprising a glass frit comprising about 43% PbO (in IRS) and a number of metal oxide additives. Particularly, exemplary electroconductive paste T1 comprises 1.5% wt. paste of bismuth oxide (Bi2O3), T2 comprises 1.5% wt. paste of tellurium oxide (TeO2), T3 comprises 1.5% wt. paste of tin oxide (SnO), and T4 comprises 1.5% wt. paste of antimony trioxide (Sb2O3). Silver particles, in an amount of about 85 wt. % (of paste), and an organic vehicle, in an amount of about 1-10 wt. % (of paste), were added to form the exemplary pastes. Exemplary solar cells were prepared using lightly-doped p-type silicon wafers with a sheet resistance of 80Ω / □.

TABLE 1Metal oxide additives in electroconductive paste formulationsReferenceIRS ComponentspasteT1T2T3T4LeadedGlass A4.63.13.13.13.1Glass Frit(43% PbO)OxideBi2O31.5AdditivesTeO21.5SnO1.5Sb2O31.5Total IRS %4.604.604.604.604.60in pastePbO w. %43.48%43.48%43.4...

example 2

[0053]A number of additional exemplary pastes E1-E22 were prepared with four glass frits A (43% PbO), B (60% PbO), C (67% PbO), D (73% PbO) and various amounts of tellurium oxide additive. Details of the exemplary paste formulations and PBO and TeO2 content and weight ratio of each exemplary paste is represented in Table 3. Exemplary solar cells, using mono-crystalline or polycrystalline silicon wafers with varying sheet resistance, were prepared by the process set forth in Example 1 above. More specifically, selected electrical performance data of solar cells prepared with multi-crystalline silicon wafer type 1A (sheet resistance of 70Ω / □) is present in Table 4, electrical performance data of solar cells prepared with multi-crystalline silicon wafer 1B (sheet resistance of 95Ω / □) is present in Table 5, electrical performance data of solar cells prepared with mono-crystalline silicon wafer type 2 (sheet resistance of 65Ω / □) is present in Table 6, electrical performance data of solar...

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Abstract

The present invention relates to an inorganic reaction system used in the manufacture of electroconductive pastes. The inorganic reaction system comprises a lead containing matrix forming composition and a tellurium oxide additive. Preferably the lead containing matrix forming composition is between 5-95 wt. % of the inorganic reaction system, and the tellurium oxide additive is between 5-95 wt. % of the inorganic reaction system. The lead containing matrix forming composition may be a glass frit, and may comprise lead oxide. Another aspect of the present invention relates to an electroconductive paste composition that comprises metallic particles, an inorganic reaction system as previously disclosed, and an organic vehicle. Another aspect of the present invention relates to an organic vehicle that comprises one or more of a binder, a surfactant, a solvent, and a thixatropic agent. Another aspect of the present invention relates to a solar cell printed with an electroconductive paste composition as disclosed, as well as an assembled solar cell module. Another aspect of the present invention relates to a method of producing a solar cell.

Description

FIELD OF THE INVENTION[0001]The present invention relates to electroconductive pastes as utilized in solar panel technology. Specifically, in one aspect, the present invention relates to an inorganic reaction system for use in electroconductive pastes. Another aspect of the present invention relates to an electroconductive paste composition comprising a conductive metal component, an inorganic reaction system, and an organic vehicle. Another aspect of the present invention relates to a solar cell produced by applying an electroconductive paste, which comprises an electroconductive metal, an inorganic reaction system, and an organic vehicle, to a silicon wafer. Yet another aspect of the present invention relates to a solar cell module assembled using solar cells produced by applying an electroconductive paste to a silicon wafer, wherein the electroconductive paste comprises an electroconductive metal, an inorganic reaction system, and an organic vehicle.BACKGROUND OF THE INVENTION[00...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): H01L31/0224
CPCH01L31/022425C03C8/14H01B1/16H01B1/20H01B1/22H01L31/068Y02E10/547B01J19/24C01B19/00C01G21/00C03C8/10C03C8/18C09D5/24H01L31/028H01L31/05
Inventor WANG, LEIHORTEIS, MATTHIASZHANG, WEIMING
Owner HERAEUS PRECIOUS METALS NORTH AMERICA CONSHOHOCKEN
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