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US20050183767: Solution-based fabrication of photovoltaic cell

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Filing Information

Inventor(s) Dong Yu · Jacqueline Fidanza · Martin Roscheisen · Brian Sager ·
Assignee(s) Nanosolar, Inc. ·
Correspondent JOSHUA D. ISENBERG ·
Application Number US10782017
Filing date 02/19/2004
Publication date 08/25/2005
Predicted expiration date 02/19/2024
U.S. Classifications 136/263  · 438/85  · 136/252  ·
International Classifications --
Kind CodeA1
74 Claims, 2 Drawings


Abstract

An ink for forming CIGS photovoltaic cell active layers is disclosed along with methods for making the ink, methods for making the active layers and a solar cell made with the active layer. The ink contains a mixture of nanoparticles of elements of groups IB, IIIA and (optionally) VIA. The particles are in a desired particle size range of between about 1 nm and about 500 nm in diameter, where a majority of the mass of the particles comprises particles ranging in size from no more than about 40% above or below an average particle size or, if the average particle size is less than about 5 nanometers, from no more than about 2 nanometers above or below the average particle size. The use of such ink avoids the need to expose the material to an H2Se gas during the construction of a photovoltaic cell and allows more uniform melting during film annealing, more uniform intermixing of nanoparticles, and allows higher quality absorber films to be formed.

Independent Claims | See all claims (74)

  1. 1. A method for fabricating a liquid containing intermixed nanoparticulate elements of groups IB and IIIA and optionally VIA, comprising the steps of: forming elemental non-oxide metal nanoparticles containing elements from group IB; and forming elemental non-oxide metal nanoparticles from group IIIA; and optionally forming elemental non-oxide nanoparticles from group VIA; intermixing the elemental non-oxide nanoparticles from groups IB and IIIA; and optionally VIA, wherein the particles are in a desired particle size range of between about 0.1 nm and about 500 nm in diameter, wherein, for each element metal, a majority of the mass of the elemental metal nanoparticles range in size from no more than about 40% above or below an average particle size, or, if the average particle size is less than about 5 nanometers, from no more than about 2 nanometers above or below the average particle size; and mixing the particles to form a liquid that serves as an ink.
  2. 13. A method for fabricating a liquid containing intermixed elements of groups IB and IIIA, and optionally VIA, comprising the steps of: forming non-oxide quantum nanoparticles containing elements from group IB; and forming non-oxide quantum nanoparticles containing elements from group IIIA; and optionally forming non-oxide quantum nanoparticles containing elements from group VIA; intermixing the non-oxide quantum nanoparticles from groups IB and IIIA and optionally VIA wherein the non-oxide quantum nanoparticles are in a desired particle size range of between about 0.1 nm and about 10 nm in diameter, wherein, for each element, a majority of the mass of the non-oxide quantum nanoparticles range in size from no more than about 40% above or below an average particle size, or, if the average particle size is less than about 5 nanometers, from no more than about 2 nanometers above or below the average particle size; and mixing the non-oxide nanoparticles to form a liquid that serves as an ink.
  3. 40. A method for fabricating a liquid containing intermixed elements of groups IB and IIIA and optionally VIA, comprising the steps of: forming nanoparticles from group IB; and intermixing the nanoparticles from group IB with elements from group IIIA, wherein the elements from group IIIA are in molten form, wherein the nanoparticles from group IB comprise particles in a desired particle size range of between about 0.1 nm and about 500 nm in diameter, wherein a majority of the mass of the nanoparticles range in size from no more than about 40% above or below an average particle size, or, if the average particle size is less than about 5 nanometers, from no more than about 2 nanometers above or below the average particle size; and mixing the nanoparticles with the molten elements to form a liquid that serves as an ink.
  4. 52. A method for fabricating a liquid containing elements of groups IB, IIIA and optionally VIA, comprising the steps of: forming nanoparticles containing elements from groups IB, and IIIA and optionally VIA, wherein the particles are in a desired particle size range of between about 0.1 nm and about 500 nm in diameter, wherein a majority of the mass of the nanoparticles range in size from no more than about 40% above or below an average particle size, or, if the average particle size is less than about 5 nanometers, from no more than about 2 nanometers above or below the average particle size; and mixing the nanoparticles to form a liquid that serves as an ink.

References Cited

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Referenced By

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Patent Family

Document NumberAssigneeInventorsIssue/Pub Date
US20050183767 Nanosolar, Inc. Dong Yu et al. Aug 2005
US20050183768 Nanosolar, Inc. Martin Roscheisen et al. Aug 2005
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