# US 10,770,601 B2 · Electro-conductive paste, solar cell and method for producing solar cell > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,770,601 B2 - Document ID: US10770601B2 - Status: Granted - Kind: B2 - Application number: 15/579,815 - Filed: 2016-06-03 - Published: 2018-12-13 - Granted: 2020-09-08 - Earliest claimed: 2015-06-17 - Assignees: Namics Corporation - Applicants: Namics Corporation - Inventors: Seiya Konno - Web page: https://patentgrep.com/patent/US10770601B2 ## CPC - H10F 77/211: {for photovoltaic cells} - C03C 3/074: containing zinc - C03C 8/10: containing lead - C03C 8/14: Glass frit mixtures having non-frit additions, e.g. opacifiers, colorants, mill-additions - C03C 8/18: containing free metals - H01B 1/22: the conductive material comprising metals or alloys - H10F 77/121: comprising only selenium or only tellurium - H10P 14/46: using a liquid - Y02E 10/50: Photovoltaic [PV] energy - H10F: INORGANIC SEMICONDUCTOR DEVICES SENSITIVE TO INFRARED RADIATION, LIGHT, ELECTROMAGNETIC RADIATION OF SHORTER WAVELENGTH OR CORPUSCULAR RADIATION - C03C: CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS - H01B: CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES (selection for magnetic properties H01F1/00; waveguides H01P {; printed circuits H05K}) - H10P: GENERIC PROCESSES OR APPARATUS FOR THE MANUFACTURE OR TREATMENT OF DEVICES COVERED BY CLASS H10 - Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION ## Abstract An electro-conductive paste which includes an electro-conductive powder, a multiple oxide containing tellurium oxide, and an organic vehicle. The electro-conductive paste contains 0.1 parts by weight to 10 parts by weight of the multiple oxide based on 100 parts by weight of the electro-conductive powder, and the content ratio of the tellurium oxide in 100% by weight of the multiple oxide as TeO2 is 3% by weight to 30% by weight. ## Claims ### Claim 1 An electro-conductive paste set for use with solar cells comprising an electro-conductive paste for forming a bus bar electrode and an electro-conductive paste for forming a finger electrode, wherein: the electro-conductive paste for forming a bus bar electrode comprises an electro-conductive powder, a multiple oxide containing tellurium oxide, and an organic vehicle, wherein the electro-conductive paste contains 0.1 parts by weight to 10 parts by weight of the multiple oxide based on 100 parts by weight of the electro-conductive powder, and wherein a content ratio of the tellurium oxide in 100% by weight of the multiple oxide as TeO2 is 3% by weight to 30% by weight, the electro-conductive paste for forming a finger electrode contains an electro-conductive powder, a multiple oxide in an amount of 0.1 parts by weight to 10 parts by weight based on 100 parts by weight of the electro-conductive powder, and an organic vehicle, and a content ratio of tellurium oxide in the multiple oxide in the electro-conductive paste for forming the finger electrode is higher than a content ratio of tellurium oxide in the multiple oxide in the electro-conductive paste for forming the bus bar electrode. ### Claim 2 (depends on 1) The electro-conductive paste set according to claim 1, wherein the content ratio of tellurium oxide in the multiple oxide of the electro-conductive paste for forming the finger electrode as TeO2 is 25% by weight to 75% by weight. ### Claim 3 (depends on 1) A method for producing a crystalline silicon solar cell, the method comprising: printing each of the electro-conductive paste for a bus bar electrode and the electro-conductive paste for a finger electrode of the electro-conductive paste set according to claim 1 on an impurity diffusion layer of a crystalline silicon substrate or on an antireflective film on an impurity diffusion layer; and forming a bus bar electrode and a finger electrode by drying and firing the printed electro-conductive pastes. ### Claim 4 (depends on 3) The method for producing a crystalline silicon solar cell according to claim 3, wherein the printing the electro-conductive paste comprises: printing the electro-conductive paste for a finger electrode on the impurity diffusion layer of the crystalline silicon substrate or the antireflective film on the impurity diffusion layer, so as to serve as a pattern of the finger electrode; and printing the electro-conductive paste for a bus bar electrode on the impurity diffusion layer of the crystalline silicon substrate or the antireflective film on the impurity diffusion layer so as to serve as a pattern of the bus bar electrode. ### Claim 5 (depends on 3) The method for producing a crystalline silicon solar cell according to claim 3, wherein the printing the electro-conductive paste comprises: printing the electro-conductive paste for a finger electrode on the impurity diffusion layer of the crystalline silicon substrate or on the antireflective film on the impurity diffusion layer so as to serve as a pattern of the finger electrode; and printing the electro-conductive paste for a bus bar electrode on the impurity diffusion layer of the crystalline silicon substrate or the antireflective film on the impurity diffusion layer so as to serve as a pattern of the finger electrode and the bus bar electrode, in that order. ### Claim 6 (depends on 1) The electro-conductive paste set according to claim 1, wherein the multiple oxide in the electro-conductive paste for forming a bus bar electrode further contains at least one oxide selected from the group consisting of Bi2O3 and PbO. ### Claim 7 (depends on 6) The electro-conductive paste set according to claim 6, wherein a total content of Bi2O3 and PbO in 100% by weight of the multiple oxide in the electro-conductive paste for forming a bus bar electrode is 50% by weight to 97% by weight. ### Claim 8 (depends on 7) The electro-conductive paste set according to claim 7, wherein a content ratio of PbO in 100% by weight of the multiple oxide in the electro-conductive paste for forming a bus bar electrode is 5% by weight to 30% by weight. ### Claim 9 (depends on 7) The electro-conductive paste set according to claim 7, wherein a content ratio of Bi2O3 in 100% by weight of the multiple oxide in the electro-conductive paste for forming a bus bar electrode is 30% by weight to 80% by weight. ### Claim 10 (depends on 6) The electro-conductive paste set according to claim 6, wherein the multiple oxide in the electro-conductive paste for forming a bus bar electrode further comprises at least one oxide selected from the group consisting of SiO2, B2O3, Li2O, Na2O, K2O, MgO, CaO, BaO, SrO, ZnO, Al2O3, TiO2 and ZrO2. ### Claim 11 (depends on 1) The electro-conductive paste set according to claim 1, wherein the electro-conductive powder in the electro-conductive paste for forming a bus bar electrode is a silver powder.