Method of manufacturing a light emitting, photovoltaic or other electronic apparatus and system

• US 8,753,946 B2
• Filed: 02/04/2012
• Issued: 06/17/2014
• Est. Priority Date: 05/31/2007
• Status: Active Grant

• Current Assignee: NthDegree Technologies Worldwide Inc., The United States of America As Represented By The Secretary of Agriculture
• Original Assignee: NASA An Agency of The United States, NthDegree Technologies Worldwide Inc.
• Inventors: Ray, William Johnstone, Lowenthal, Mark David, Shotton, Neil O., Blanchard, Richard A., Lewandowski, Mark Allan, Fuller, Kirk A., Frazier, Donald Odell
• Primary Examiner(s): Nhu, David
• Application Number:
  US13/366,279
• Publication Number:
  US 20120178194A1
• Time in Patent Office: 864 Days
• Field of Search: 438/700, 438/311, 438/141, 438/780, 438/597, 257/E21.006, 257/E21.007, 257/E21.042, 257/E21.053, 257/E21.077, 257/E21.085, 257/E21.091, 257/E21.17, 257/E21.126, 257/E21.134, 257/E21.202, 257/E21.266, 257/E21.288, 257/E21.352
• US Class Current: 438/311
• CPC Class Codes: G09G 2300/0426 Layout of electrodes and connections
• CPC Class Codes: G09G 2300/0439 Pixel structures
• CPC Class Codes: G09G 2330/028 Generation of voltages supplied to electrode drivers in a matrix display other than LCD
• CPC Class Codes: G09G 3/32 semiconductive, e.g. using light-emitting diodes [LED]
• CPC Class Codes: H01L 21/20 Deposition of semiconductor materials on a substrate, e.g. epitaxial growth solid phase epitaxy
• CPC Class Codes: H01L 31/035281 Shape of the body
• CPC Class Codes: H01L 31/0475 PV cell arrays made by cells in a planar, e.g. repetitive, configuration on a single semiconductor substrate; PV cell microarrays PV modules composed of a plurality of thin film solar cells deposited on the same substrate H01L31/046
• CPC Class Codes: H01L 31/0508 the interconnection means having a particular shape
• CPC Class Codes: H01L 31/0512 made of a particular material or composition of materials
• CPC Class Codes: H01L 31/068 the potential barriers being only of the PN homojunction type, e.g. bulk silicon PN homojunction solar cells or thin film polycrystalline silicon PN homojunction solar cells
• CPC Class Codes: H10K 2102/331 Nanoparticles used in non-emissive layers, e.g. in packaging layer
• CPC Class Codes: H10K 50/11 characterised by the electroluminescent [EL] layers
• CPC Class Codes: H10K 50/805 Electrodes
• CPC Class Codes: H10K 50/858 comprising refractive means, e.g. lenses
• CPC Class Codes: H10K 59/17 Passive-matrix OLED displays
• CPC Class Codes: H10K 59/879 comprising refractive means, e.g. lenses
• CPC Class Codes: H10K 71/00 Manufacture or treatment specially adapted for the organic devices covered by this subclass
• CPC Class Codes: H10K 77/10 Substrates, e.g. flexible substrates
• CPC Class Codes: Y02E 10/547 Monocrystalline silicon PV cells

Abstract

The present invention provides a method of manufacturing an electronic apparatus, such as a lighting device having light emitting diodes (LEDs) or a power generating device having photovoltaic diodes. The exemplary method includes depositing a first conductive medium within a plurality of channels of a base to form a plurality of first conductors; depositing within the plurality of channels a plurality of semiconductor substrate particles suspended in a carrier medium; forming an ohmic contact between each semiconductor substrate particle and a first conductor; converting the semiconductor substrate particles into a plurality of semiconductor diodes; depositing a second conductive medium to form a plurality of second conductors coupled to the plurality of semiconductor diodes; and depositing or attaching a plurality of lenses suspended in a first polymer over the plurality of diodes. In various embodiments, the depositing, forming, coupling and converting steps are performed by or through a printing process.

Claims

1. A method of manufacturing an electronic apparatus, the method comprising:

depositing a first conductive medium on a base to form at least one first conductor;

depositing a plurality of semiconductor substrate particles suspended in a carrier medium;

forming an ohmic contact between the plurality of semiconductor substrate particles and the at least one first conductor;

forming a pn junction in each semiconductor substrate particle by depositing a dopant onto the plurality of semiconductor substrate particles and annealing the plurality of semiconductor substrate particles to form a plurality of semiconductor diodes;

depositing a second conductive medium to form at least one second conductor coupled to the plurality of semiconductor diodes; and

depositing a plurality of substantially spherical lenses suspended in a first polymer over the plurality of diodes, the plurality of substantially spherical lenses having at least a first index of refraction and the first polymer having at least a second, different index of refraction.

2. The method of claim 1, wherein the plurality of semiconductor diodes are substantially spherical, substantially toroidal, substantially cylindrical, substantially faceted, substantially rectangular, substantially flat, or substantially elliptical.

3. The method of claim 1, wherein the plurality of semiconductor diodes are substantially spherical, and wherein a ratio of a mean diameter of the plurality of substantially spherical lenses to a mean diameter of the plurality of semiconductor diodes is substantially about five to one (5:

1).

4. The method of claim 1, wherein the plurality of semiconductor diodes are substantially spherical, and wherein a ratio of a mean diameter of the plurality of substantially spherical lenses to a mean diameter of the plurality of semiconductor diodes is between about ten to one (10:

1) and two to one (2;

1).

5. The method of claim 1, wherein the plurality of semiconductor diodes are substantially spherical, and wherein the comparative size or spacing of the plurality of substantially spherical lenses provide a mode coupling to the plurality of semiconductor diodes.

6. The method of claim 1, wherein a mean diameter or length of the plurality of semiconductor diodes is greater than about twenty (20) microns and less than about forty (40) microns.

7. The method of claim 1, wherein the step of depositing the plurality of substantially spherical lenses suspended in the first polymer further comprises attaching a prefabricated layer to the plurality of semiconductor diodes, the prefabricated layer comprising the plurality of substantially spherical lenses suspended in the first polymer.

8. The method of claim 1, wherein the plurality of semiconductor substrate particles comprise gallium nitride, gallium arsenide, or silicon.

9. The method of claim 8, wherein the first conductive medium comprises a conductive ink or a conductive polymer.

10. The method of claim 1, further comprising:

partially curing the first conductive medium;

wherein the step of forming an ohmic contact further comprises fully curing the first conductive medium.

11. The method of claim 1, wherein the step of depositing the first conductive medium comprises sputtering, coating, vapor depositing or electroplating a metal, a metal alloy, or a combination of metals.

12. The method of claim 1, wherein the carrier medium is a reactive carrier medium and wherein the step of forming an ohmic contact further comprises:

removing the reactive carrier medium; and

curing or re-curing the first conductive medium.

13. The method of claim 1, wherein the carrier medium is an anisotropic carrier medium and wherein the step of forming an ohmic contact further comprises:

compressing the plurality of semiconductor substrate particles suspended in the anisotropic conductive medium.

14. The method of claim 1, wherein the step of forming an ohmic contact further comprises:

annealing or alloying the plurality of semiconductor substrate particles with the at least one first conductor.

15. The method of claim 1, wherein the annealing or alloying is laser or thermal annealing or alloying.

16. The method of claim 1, wherein the dopant material is a substrate liquid or film or a dopant element or compound suspended in a carrier.

17. The method of claim 1, wherein the dopant is deposited on a first, upper portion of the plurality of semiconductor substrate particles and wherein about fifteen percent to fifty-five percent of a surface of each semiconductor diode of substantially all of the plurality of semiconductor diodes has a layer or region having a first majority carrier or dopant and the remaining diode substrate has a second majority carrier or dopant.

18. The method of claim 1, wherein the resulting plurality of semiconductor diodes are light emitting diodes or photovoltaic diodes.

19. The method of claim 1, further comprising:

depositing a plurality of third conductors over or within the plurality of second conductors.

20. The method of claim 1, wherein the base further comprises a Bragg reflector or a reflective plastic or polyester coating.

21. The method of claim 1, wherein the base further comprises:

a plurality of conductive vias extending between a first side and a second side of the base and correspondingly coupled at the first side to the plurality of first conductors; and

a conductive backplane coupled to the plurality of conductive vias and coupled to or integrated with the second side of the base.

22. The method of claim 1, further comprising:

depositing a plurality of inorganic dielectric particles suspended with a photoinitiator compound in a second polymer or resin to form a plurality of insulators correspondingly coupled to each of the plurality of diodes.

23. The method of claim 1, wherein the base comprises at least one of the following:

paper, coated paper, plastic coated paper, embossed paper, fiber paper, cardboard, poster paper, poster board, wood, plastic, rubber, fabric, glass, and/or ceramic.

24. The method of claim 1, wherein the step of depositing a second conductive medium further comprises:

depositing an optically transmissive conductor or conductive compound suspended in a polymer, resin or other media.

25. The method of claim 24, wherein the optically transmissive conductor or conductive compound suspended in a polymer, resin or other media further comprises at least one of the following:

carbon nanotubes, antimony tin oxide, indium tin oxide, or polyethylene-dioxithiophene.

26. The method of claim 1, wherein the plurality of substantially spherical lenses comprise borosilicate glass or polystyrene latex.

27. The method of claim 1, further comprising:

attaching an interface for insertion into a standardized lighting socket.

28. The method of claim 27, wherein the interface is compatible with an E12, E14, E26, E27, or GU-10 lighting standard.

29. The method of claim 27, wherein the interface is compatible with a standard Edison-type lighting socket.

30. The method of claim 27, wherein the interface is compatible with a standard fluorescent-type lighting socket.

31. The method of claim 1, wherein the deposition steps further comprise at least one of the following types of deposition:

printing, coating, rolling, spraying, layering, sputtering, lamination, screen printing, inkjet printing, electro-optical printing, electroink printing, photoresist printing, thermal printing, laser jet printing, magnetic printing, pad printing, flexographic printing, hybrid offset lithography, or Gravure printing.

32. A method of manufacturing an electronic apparatus, the method comprising:

printing a first conductive medium within a plurality of cavities of a base to form a plurality of first conductors;

printing within the plurality of cavities a plurality of substantially spherical substrate particles suspended in a carrier medium;

printing a dopant on first, upper portion the plurality of substantially spherical semiconductor substrate particles;

annealing the doped plurality of substantially spherical semiconductor substrate particles to form a plurality of substantially spherical diodes having at least a partially hemispherical shell pn junction;

printing an electrically insulating medium over a first portion of the plurality of substantially spherical diodes;

printing a second conductive medium over a second portion of the plurality of substantially spherical diodes to form a plurality of second conductors; and

printing a plurality of substantially spherical lenses suspended in a first polymer over the plurality of substantially spherical diodes, the plurality of substantially spherical lenses having at least a first index of refraction and the first polymer having at least a second, different index of refraction.