Coated silver-containing particles, method and apparatus of manufacture, and silver-containing devices made therefrom
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
B22F-005/00
B22F-009/08
출원번호
UP-0642690
(2006-12-21)
등록번호
US-7621976
(2009-12-02)
발명자
/ 주소
Hampden Smith, Mark J.
Kodas, Toivo T.
Powell, Quint H.
Skamser, Daniel J.
Caruso, James
Chandler, Clive
출원인 / 주소
Cabot Corporation
인용정보
피인용 횟수 :
11인용 특허 :
216
초록▼
Provided are silver-containing powders and a method and apparatus for manufacturing the silver-containing particles of high quality, of a small size and narrow size distribution. An aerosol is generated from liquid feed and sent to a furnace, where liquid in droplets in the aerosol is vaporized to p
Provided are silver-containing powders and a method and apparatus for manufacturing the silver-containing particles of high quality, of a small size and narrow size distribution. An aerosol is generated from liquid feed and sent to a furnace, where liquid in droplets in the aerosol is vaporized to permit formation of the desired particles, which are then collected in a particle collector. The aerosol generation involves preparation of a high quality aerosol, with a narrow droplet size distribution, with close control over droplet size and with a high droplet loading suitable for commercial applications.
대표청구항▼
What is claimed is: 1. A process for forming a photovoltaic conductive feature, comprising: (a) providing a precursor material comprising at least one of particles comprising a metal, the particles being suspended in a suspension medium, or a molecular precursor compound to the metal; (b) atomizing
What is claimed is: 1. A process for forming a photovoltaic conductive feature, comprising: (a) providing a precursor material comprising at least one of particles comprising a metal, the particles being suspended in a suspension medium, or a molecular precursor compound to the metal; (b) atomizing the precursor material to form a flowing aerosol stream comprising droplets of the precursor material; and (c) forming the photovoltaic conductive feature comprising lines having a width smaller than about 50 microns from the precursor material. 2. The process of claim 1, wherein the metal comprises silver. 3. The process of claim 1, wherein the suspended particles comprise silver particles having a particle size less than 0.5 μm. 4. The process of claim 1, wherein the suspended particles comprise silver particles having a particle size less than 0.3 μm. 5. The process of claim 1, wherein the suspended particles comprise silver particles having a particle size less than 0.1 μm. 6. The process of claim 1, wherein the process comprises drying the flowing aerosol stream to form a dried aerosol, which is formed into the photovoltaic conductive feature. 7. The process of claim 1, wherein the precursor material further comprises glass frit. 8. The process of claim 1, wherein the process further comprises heating the flowing aerosol to form a metallic powder comprising metallic particles, which is used to form the photovoltaic conductive feature. 9. The process of claim 8, wherein the metallic powder comprises multi-phase particles comprising a silver phase and a second phase, wherein the second phase is in the form of a coating around a core of the silver phase. 10. The process of claim 9, wherein the second phase is also a metallic phase. 11. The process of claim 9, wherein the second phase comprises an oxide. 12. The process of claim 11, wherein the oxide comprises an oxide of zinc, tin, barium, molybdenum, manganese, vanadium, niobium, tantalum, tungsten, iron, silver, chromium, cobalt, nickel, copper, yttrium, iridium, beryllium, silicon, zirconium, aluminum, bismuth, magnesium, thorium or gadolinium. 13. The process of claim 11, wherein the oxide comprises silica, alumina, titania, zirconia or yttria. 14. The process of claim 11, wherein the oxide comprises an oxide of copper, bismuth or tin. 15. The process of claim 9, wherein the second phase comprises glass fit. 16. The process of claim 8, wherein at least about 90 weight percent of the metallic particless are smaller than about twice the weight average size of the particles. 17. The process of claim 8, wherein less than 10 weight percent of the metallic particles are smaller than about one-half the weight average size. 18. The process of claim 8, wherein the metallic particles are substantially spheroidal in shape. 19. The process of claim 8, wherein step (b) comprises spray pyrolysis. 20. The process of claim 8, wherein the metallic particles comprise ultrafine silver particles having a particle size of from 30 nm to 50 nm. 21. The process of claim 8, wherein the metallic particles have an average particle size of from about 0.5 micron to about 2 microns. 22. The process of claim 8, wherein the metallic particles comprise a mixture of silver particles and palladium particles. 23. The process of claim 8, wherein the metallic particles comprise an alloy. 24. The process of claim 23, wherein the alloy is an alloy of silver and palladium. 25. The process of claim 1, wherein the conductive feature comprises a grid electrode including primary collector lines and secondary collector lines, wherein the primary collector lines collect electric current from different portions of the active photovoltaic layer, and wherein the secondary collector lines act as an electrical bus to the primary collector lines. 26. The process of claim 1, wherein the conductive feature has a thickness smaller than about 10 microns. 27. The process of claim 1, wherein the lines have a line pitch smaller than about 100 microns. 28. The process of claim 1, wherein the lines have a line pitch smaller than about 50 microns. 29. The process of claim 1, wherein the atomizing is achieved by an ultrasonic aerosol generator. 30. The process of claim 1, wherein the aerosol is concentrated with a virtual impactor. 31. The process of claim 1, wherein the process further comprises removing large droplets from the aerosol with an impactor. 32. The process of claim 1, wherein the droplets have an average droplet size that is not greater than about 10 μm. 33. The process of claim 1, wherein the droplets have an average droplet size that is not greater than about 5 μm. 34. The process of claim 1, wherein the photovoltaic conductive feature comprises a solar cell conductive feature.
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