WO2008122047A1 - Structure de cellule photovoltaïque comprenant une pluralité de concentrateurs à encoches et rayon défini, et procédé correspondant - Google Patents

Structure de cellule photovoltaïque comprenant une pluralité de concentrateurs à encoches et rayon défini, et procédé correspondant Download PDF

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Publication number
WO2008122047A1
WO2008122047A1 PCT/US2008/059170 US2008059170W WO2008122047A1 WO 2008122047 A1 WO2008122047 A1 WO 2008122047A1 US 2008059170 W US2008059170 W US 2008059170W WO 2008122047 A1 WO2008122047 A1 WO 2008122047A1
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WIPO (PCT)
Prior art keywords
region
concentrator
concentrator element
radius
curvature
Prior art date
Application number
PCT/US2008/059170
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English (en)
Inventor
Kevin R. Gibson
Alelie T. Funcell
Original Assignee
Solaria Corporation
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from US11/695,566 external-priority patent/US20080236651A1/en
Priority claimed from US12/060,769 external-priority patent/US20090056806A1/en
Application filed by Solaria Corporation filed Critical Solaria Corporation
Publication of WO2008122047A1 publication Critical patent/WO2008122047A1/fr

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L31/00—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
    • H01L31/04—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof adapted as photovoltaic [PV] conversion devices
    • H01L31/054—Optical elements directly associated or integrated with the PV cell, e.g. light-reflecting means or light-concentrating means
    • H01L31/0547—Optical elements directly associated or integrated with the PV cell, e.g. light-reflecting means or light-concentrating means comprising light concentrating means of the reflecting type, e.g. parabolic mirrors, concentrators using total internal reflection
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24S—SOLAR HEAT COLLECTORS; SOLAR HEAT SYSTEMS
    • F24S23/00—Arrangements for concentrating solar-rays for solar heat collectors
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/50—Photovoltaic [PV] energy
    • Y02E10/52—PV systems with concentrators

Definitions

  • the present invention relates generally to solar energy techniques.
  • the present invention provides a method and resulting device fabricated from a plurality of concentrating elements respectively coupled to a plurality of photovoltaic regions.
  • the present method and structure are directed to a notch structure provided between a pair of concentrating elements.
  • the notch structure is implemented to improve efficiency of the multiple concentrator structure.
  • the invention has been applied to solar panels, commonly termed modules, but it would be recognized that the invention has a much broader range of applicability.
  • Solar energy possesses many characteristics that are very desirable! Solar energy is renewable, clean, abundant, and often widespread. Certain technologies developed often capture solar energy, concentrate it, store it, and convert it into other useful forms of energy.
  • Solar panels have been developed to convert sunlight into energy.
  • solar thermal panels often convert electromagnetic radiation from the sun into thermal energy for heating homes, running certain industrial processes, or driving high grade turbines to generate electricity.
  • solar photovoltaic panels convert sunlight directly into electricity for a variety of applications.
  • Solar panels are generally composed of an array of solar cells, which are interconnected to each other. The cells are often arranged in series and/or parallel groups of cells in series. Accordingly, solar panels have great potential to benefit our nation, security, and human users. They can even diversify our energy requirements and reduce the world's dependence on oil and other potentially detrimental sources of energy.
  • the present invention relates generally to solar energy techniques.
  • the present invention provides a method and resulting device fabricated from a plurality of concentrating elements respectively coupled to a plurality of photovoltaic regions. More particularly, the present method and structure are directed to a notch structure provided between a pair of concentrating elements.
  • the notch structure is implemented to improve efficiency of the multiple concentrator structure.
  • the invention has been applied to solar panels, commonly termed modules, but it would be recognized that the invention has a much broader range of applicability.
  • the present invention provides a solar cell concentrator structure.
  • the solar cell concentrator structure includes a first concentrator element.
  • the first concentrator element includes a first aperture region and a first exit region.
  • the first exit region includes a first back surface region and a first corner region.
  • the solar cell concentrator structure further includes a second concentrator element integrally formed with the first concentrator element.
  • the second concentrator element includes a second aperture region and a second exit region.
  • the second exit region includes a second back surface region and a second corner region.
  • the solar cell concentrator structure includes a first radius of curvature of 0.25 mm and less characterizing the first corner structure and the second corner structure.
  • the solar cell concentrator structure also includes a first coupling region between the first exit region and a first surface region of a first photovoltaic device and a second coupling region between the second exit region and a second surface region of a second photovoltaic device. Moreover, the solar cell concentrator structure includes a separation region provided between the first concentrator element and the second concentrator element. The separation region is characterized by a width separating the first exit region from the second exit region.
  • the solar cell concentrator structure includes a second radius of curvature of 0.15 mm and less characterizing a region between the first concentrator element and the second concentrator element, a triangular shaped region including an apex defined by the radius of curvature and a base defined by the separation region, and a refractive index of about 1 characterizing the triangular region.
  • the invention provides a solar module concentrator structure.
  • the solar module concentrator structure includes a plurality of elongated concentrating units. Each of the plurality of elongated concentrating units comprises a concentrator element.
  • the concentrator element includes an aperture region and an exit region.
  • the exit region includes a back surface region and a corner structure.
  • Each of the plurality of elongated concentrating units also includes a radius of curvature of 0.25 mm and less characterizing the corner structure and a coupling region between the exit region and a photovoltaic region.
  • the present invention provides a solar cell concentrator structure.
  • the solar cell concentrator structure includes a piece of optical material characterized by a first spatial direction and a second spatial direction. The first spatial direction is normal to the second spatial direction.
  • the solar cell concentrator structure further includes a first concentrator element and a second concentrator element provided within a first portion of the piece of optical material and a second portion of the piece of optical material, respectively, defined along the second spatial direction.
  • the solar cell concentrator structure includes an aperture region provided on a first surface region of the piece of optical material. The aperture region is adapted to allow electromagnetic radiation to be illuminated thereon.
  • the solar cell concentrator structure also includes an exit region provided on a second surface region of the piece of optical material.
  • the exit region is adapted to allow electromagnetic radiation to be outputted and is characterized by a corner region having a first radius of curvature of about 0.25 mm and less.
  • the solar cell concentrator structure includes a separation region provided between the first concentrator element and the second concentrator element. The separation region is characterized by a width within a vicinity of the exit region.
  • the solar cell concentrator structure includes a radius of curvature of 0.15 mm and less within a predetermined depth of the piece of optical material. The radius of curvature is provided between the first concentrator element and the second concentrator element.
  • the present invention provides a method for manufacturing a solar cell.
  • the method includes a step of providing a solar concentrator structure.
  • the structure includes a first concentrator element with a first aperture region and a first exit region and a second concentrator element integrally formed with the first concentrator element.
  • the second concentrator element includes a second aperture region and a second exit region.
  • the solar concentrator structure also includes a separation region provided between the first concentrator element and the second concentrator element. The separation region is characterized by a width separating the first exit region from the second exit region.
  • the solar concentrator structure includes a radius of curvature of 0.15 mm and less characterizing a region between the first concentrator element and the second concentrator element and a triangular region including an apex formed by the radius of curvature and a base formed by the separation region. Moreover, the solar concentrator structure includes a refractive index of about 1.0 characterizing the triangular region. The method further includes a step of coupling a first photovoltaic region to the first concentrator element and a step of coupling a second photovoltaic region to the second concentrator element.
  • the invention provides a solar concentrator structure.
  • the solar concentrator structure includes a thickness of material characterized along a first spatial direction including at least a first concentrator element and a second concentrator element provided within a first portion of the thickness of material and a second portion of the thickness of material defined along a second spatial direction.
  • the solar concentrator structure also includes an aperture region provided on a first surface region of the thickness of material. The aperture region is adapted to allow electromagnetic radiation to be illuminated thereon.
  • the solar concentrator structure includes an exit region provided on a second surface region of the thickness of material. The exit region is adapted to allow electromagnetic radiation to be outputted.
  • the solar concentrator structure includes a separation region provided between the first concentrator element and the second concentrator element. The separation region is characterized by a width within a vicinity of the exit region.
  • the solar concentrator structure includes a radius of curvature of 0.15 mm and less within a predetermined depth of the thickness of material.
  • the invention provides for an improved solar cell concentrator structure for manufacture of solar module.
  • Such solar concentrator structure uses a single piece of polymeric or glass webbing or a combination integrally including a plurality of elongated concentrating units each comprising a geometric light concentrator element coupled to one of a plurality of photovoltaic strips.
  • the geometric light concentrator element has a geometric concentration characteristic with an aperture to exit ratio in a range from about 1.8 to about 4.5 and the exit region includes two exit notches with a radius of curvature of 0.25 mm and less characterizing the corresponding two corner structures.
  • a coupling region that is configured to have its refractive index matched and accommodate the radius of the exit notches.
  • the use of concentrator according to the present invention helps the solar conversion module having less photovoltaic material per surface area (e.g., 80% or less, 50% or less) than conventional solar panel module. Depending upon the embodiment, one or more of these benefits may be achieved.
  • FIG. 1 is a simplified diagram of a solar cell according to an embodiment of the present invention.
  • FIG. 2 is a simplified diagram of solar cell concentrating elements according to an embodiment of the present invention.
  • Figure 2A is a simplified side-view diagram of solar cell concentrating elements according to an embodiment of the present invention.
  • Figure 3 is a simplified diagram of a plurality of notch structures for a solar cell concentrator according to an embodiment of the present invention
  • Figure 4 is a more detailed diagram of a notch structure for a solar cell concentrator according to an embodiment of the present invention.
  • Figure 5 is a plot of irradiation loss as a function of notch structure size according to an embodiment of the present invention.
  • Figure 6 is a simplified diagram of a coupling region provided between an exit region of an concentrator element and a photovoltaic region according to an embodiment of the present invention
  • Figure 7 is a plot of concentration ratio as a function of corner structure size of a solar cell concentrator according to an embodiment of the present invention.
  • Figure 8 is a plot of irradiation loss as a function of corner structure of the solar concentrator according to an embodiment of the present invention.
  • the present invention provides a method and resulting device fabricated from a plurality of concentrating elements respectively coupled to a plurality of photovoltaic regions. More particularly, the present method and structure are directed to a notch structure provided between a pair of concentrating elements. In a specific embodiment, the notch structure is implemented to improve efficiency of the multiple concentrator structure.
  • the invention has been applied to solar panels, commonly termed modules, but it would be recognized that the invention has a much broader range of applicability.
  • FIG. 1 is a simplified diagram of a solar cell according to an embodiment of the present invention.
  • This diagram is merely an example, which should not unduly limit the scope of the claims herein.
  • One of ordinary skill in the art would recognize other variations, modifications, and alternatives.
  • the device has a back cover member 101, which includes a surface area and a back area.
  • the back cover member also has a plurality of sites, which are spatially disposed, for electrical members, such as bus bars, and a plurality of photovoltaic regions.
  • the back cover can be free from any patterns and is merely provided for support and packaging.
  • the device has a plurality of photovoltaic strips 105, each of which is disposed overlying the surface area of the back cover member.
  • the plurality of photovoltaic strips corresponds to a cumulative area occupying a total photovoltaic spatial region, which is active and converts sunlight into electrical energy.
  • An encapsulating material 115 is overlying a portion of the back cover member. That is, an encapsulating material forms overlying the plurality of strips, and exposed regions of the back cover, and electrical members.
  • the encapsulating material can be a single layer, multiple layers, or portions of layers, depending upon the application.
  • the encapsulating material can be provided overlying a portion of the photovoltaic strips or a surface region of the front cover member, which would be coupled to the plurality of photovoltaic strips.
  • a front cover member 121 is coupled to the encapsulating material. That is, the front cover member is formed overlying the encapsulate to form a multilayered structure including at least the back cover, bus bars, plurality of photovoltaic strips, encapsulate, and front cover.
  • the front cover includes one or more concentrating elements, which concentrate (e.g., intensify per unit area) sunlight onto the plurality of photovoltaic strips. That is, each of the concentrating elements can be associated respectively with each of or at least one of the photovoltaic strips.
  • an interface region is provided along at least a peripheral region of the back cover member and the front cover member.
  • the interface region may also be provided surrounding each of the strips or certain groups of the strips depending upon the embodiment.
  • the device has a sealed region and is formed on at least the interface region to form an individual solar cell from the back cover member and the front cover member.
  • the sealed region maintains the active regions, including photovoltaic strips, in a controlled environment free from external effects, such as weather, mechanical handling, environmental conditions, and other influences that may degrade the quality of the solar cell.
  • the sealed region and/or sealed member (e.g., two substrates) protect certain optical characteristics associated with the solar cell and also protects and maintains any of the electrical conductive members, such as bus bars, interconnects, and the like.
  • the sealed member structure there can be other benefits achieved using the sealed member structure according to other embodiments.
  • the total photovoltaic spatial region occupies a smaller spatial region than the surface area of the back cover. That is, the total photovoltaic spatial region uses less silicon than conventional solar cells for a given solar cell size. In a preferred embodiment, the total photovoltaic spatial region occupies about 80% and less of the surface area of the back cover for the individual solar cell. Depending upon the embodiment, the photovoltaic spatial region may also occupy about 70% and less or 60% and less or preferably 50% and less of the surface area of the back cover or given area of a solar cell. Of course, there can be other percentages that have not been expressly recited according to other embodiments.
  • back cover member and “front cover member” are provided for illustrative purposes, and not intended to limit the scope of the claims to a particular configuration relative to a spatial orientation according to a specific embodiment. Further details of each of the various elements in the solar cell can be found throughout the present specification and more particularly below.
  • the present invention provides a packaged solar cell assembly being capable of stand-alone operation to generate power using the packaged solar cell assembly and/or with other solar cell assemblies.
  • the packaged solar cell assembly includes rigid front cover member having a front cover surface area and a plurality of concentrating elements thereon.
  • the rigid front cover member consist of a variety of materials.
  • the rigid front cover is made of polymer material.
  • the rigid front cover is made of transparent polymer material having a reflective index of about 1.4 or 1.42 or greater.
  • the rigid front cover has a Young's Modulus of a suitable range.
  • Each of the concentrating elements has a length extending from a first portion of the front cover surface area to a second portion of the front cover surface area.
  • Each of the concentrating elements has a width provided between the first portion and the second portion.
  • Each of the concentrating elements having a first edge region coupled to a first side of the width and a second edge region provided on a second side of the width. The first edge region and the second edge region extend from the first portion of the front cover surface area to a second portion of the front cover surface area.
  • the plurality of concentrating elements is configured in a parallel manner extending from the first portion to the second portion.
  • embodiment can have many variations.
  • the embodiment may further includes a first electrode member that is coupled to a first region of each of the plurality of photovoltaic strips and a second electrode member coupled to a second region of each of the plurality of photovoltaic strips.
  • the solar cell assembly additionally includes a first electrode member coupled to a first region of each of the plurality of photovoltaic strips and a second electrode member coupled to a second region of each of the plurality of photovoltaic strips.
  • the first electrode includes a first protruding portion extending from a first portion of the sandwiched assembly and the second electrode comprising a second protruding portion extending from a second portion of the sandwiched assembly.
  • the present invention provides a solar cell apparatus.
  • the solar cell apparatus includes a backside substrate member comprising a backside surface region and an inner surface region.
  • the backside substrate member can be made from various materials.
  • the backside member is characterized by a polymer material.
  • the present invention provides a solar cell apparatus that includes a backside substrate member.
  • the backside substrate member includes a backside surface region and an inner surface region.
  • the backside substrate member is characterized by a width.
  • the backside substrate member is characterized by a length of about eight inches and less.
  • the backside substrate member is characterized by a width of about 8 inches and less and a length of more than 8 inches.
  • U.S. Patent Application 11/445,933 [Attorney Docket No.: 025902-000210US], commonly assigned, and hereby incorporated by reference herein.
  • FIG. 2 is a simplified diagram of solar cell concentrating elements according to an embodiment of the present invention.
  • This diagram is merely an example, which should not unduly limit the scope of the claims herein.
  • One of ordinary skill in the art would recognize other variations, modifications, and alternatives.
  • each of the concentrating elements for the strip configuration includes a trapezoidal shaped member.
  • Each of the trapezoidal shaped members has a bottom surface 201 coupled to a pyramidal shaped region 205 coupled to an upper region 207.
  • the upper region is defined by surface 209, which is co-extensive of the front cover.
  • Each of the members is spatially disposed and in parallel to each other according to a specific embodiment.
  • the term "trapezoidal” or “pyramidal” may include embodiments with straight or curved or a combination of straight and curved walls according to embodiments of the present invention.
  • the concentrating elements may be on the front cover, integrated into the front cover, and/or be coupled to the front cover according to embodiments of the present invention. Further details of the front cover with concentrating elements are provided more particularly below.
  • a solar cell apparatus includes a shaped concentrator device operably coupled to each of the plurality of photovoltaic strips.
  • the shaped concentrator device has a first side and a second side.
  • the solar cell apparatus includes an aperture region provided on the first side of the shaped concentrator device.
  • the concentrator device includes a first side region and a second side region.
  • the first side region is characterized by a roughness of about 100 nanometers or 120 nanometers RMS and less
  • the second side region is characterized by a roughness of about 100 nanometers or 120 nanometers RMS and less.
  • the roughness is characterized by a dimension value of about 10% of a light wavelength derived from the aperture regions.
  • the backside member can have a pyramid-type shape.
  • the solar cell apparatus includes an exit region provided on the second side of the shaped concentrator device.
  • the solar cell apparatus includes a geometric concentration characteristic provided by a ratio of the aperture region to the exit region. The ratio can be characterized by a range from about 1.8 to about 4.5.
  • the solar cell apparatus also includes a polymer material characterizing the shaped concentrator device.
  • the solar cell apparatus additionally includes a refractive index of about 1.45 and greater characterizing the polymer material of the shaped concentrator device.
  • the solar cell apparatus includes a coupling material formed overlying each of the plurality of photovoltaic strips and coupling each of the plurality of photovoltaic regions to each of the concentrator devices.
  • the coupling material is characterized by a suitable Young's Modulus.
  • the solar cell apparatus includes a refractive index of about 1.45 and greater characterizing the coupling material coupling each of the plurality of photovoltaic regions to each of the concentrator device.
  • the polymer material is characterized by a thermal expansion constant that is suitable to withstand changes due to thermal expansion of elements of the solar cell apparatus.
  • the plurality of concentrating elements has a light entrance area (Al) and a light exit area (A2) such that A2/A1 is 0.8 and less.
  • the plurality of concentrating elements has a light entrance area (Al) and a light exit area (A2) such that A2/A1 is 0.8 and less, and the plurality of photovoltaic strips are coupled against the light exit area.
  • the ratio of A2/A1 is about 0.5 and less.
  • each of the concentrating elements has a height of 7mm or less.
  • the sealed sandwiched assembly has a width ranging from about 100 millimeters to about 210 millimeters and a length ranging from about 100 millimeters to about 210 millimeters. In a specific embodiment, the sealed sandwiched assembly can even have a length of about 300 millimeters and greater.
  • each of the concentrating elements has a pair of sides. In a specific embodiment, each of the sides has a surface finish of 100 nanometers or less or 120 nanometers and less RMS. Of course, there can be other variations, modifications, and alternatives.
  • FIG. 2A the front cover has been illustrated using a side view 201, which is similar to Figure 2.
  • the front cover also has a top-view illustration 210.
  • a section view 220 from “B-B” has also been illustrated.
  • a detailed view "A" of at least two of the concentrating elements 230 is also shown.
  • the concentrating elements are made of a suitable material.
  • the concentrating elements can be made of a polymer, glass, or other optically transparent materials, including any combination of these, and the like.
  • the suitable material is preferably environmentally stable and can withstand environmental temperatures, weather, and other "outdoor" conditions.
  • the concentrating elements can also include portions that are coated with an anti-reflective coating for improved efficiency. Coatings can also be used for improving a durability of the concentrating elements.
  • the solar cell apparatus includes a first reflective side provided between a first portion of the aperture region and a first portion of the exit region.
  • the first reflective side includes a first polished surface of a portion of the polymer material.
  • the first reflective side is characterized by a surface roughness of about 120 nanometers RMS and less.
  • the solar cell apparatus includes a second reflective side provided between a second portion of the aperture region and a second portion of the exit region.
  • the second reflective side comprises a second polished surface of a portion of the polymer material.
  • the second reflective side is characterized by a surface roughness of about 120 nanometers and less.
  • the first reflective side and the second reflective side provide for total internal reflection of one or more photons provided from the aperture region.
  • the solar cell apparatus includes a geometric concentration characteristic provided by a ratio of the aperture region to the exit region.
  • the ratio is characterized by a range from about 1.8 to about 4.5.
  • the solar cell apparatus includes a polymer material characterizing the shaped concentrator device, which includes the aperture region, exit region, first reflective side, and second reflective side.
  • the polymer material is capable of being free from damaged caused by ultraviolet radiation.
  • the solar cell apparatus has a refractive index of about 1.45 and greater characterizing the polymeric and/or glass material of the shaped concentrator device.
  • the solar cell apparatus includes a coupling material formed overlying each of the plurality of photovoltaic strips and coupling each of the plurality of photovoltaic regions to each of the concentrator devices.
  • the solar cell apparatus additionally includes one or more pocket regions facing each of the first reflective side and the second reflective side. The one or more pocket regions can be characterized by a refractive index of about 1 to cause one or more photons from the aperture region to be reflected toward the exit region.
  • each of the concentrating elements is separated by a region having a notch structure of a predetermined size and shape according to a specific embodiment. Additionally, the exit region of each of the shaped concentrator device includes a corner structure having a first predetermined size and shape to also allow for good efficiency of the subject concentrator devices. Further details of the notch structures and the corner structures can be found throughout the present specification and more particularly below.
  • FIG. 3 is a simplified diagram of a plurality of notch structures and corner structures for a solar cell concentrator 300 according to an embodiment of the present invention.
  • This diagram is merely an example, which should not unduly limit the scope of the claims herein.
  • the concentrator structure has a first concentrator element 301, which includes a first aperture region 304 and a first exit region 306.
  • the concentrator structure also includes a second concentrator element 302 integrally formed with the first concentrator element.
  • the second concentrator element includes a second aperture region 308 and a second exit region 310.
  • the concentrator structure has a separation region 312 provided between the first concentrator element and the second concentrator element.
  • the separation region is characterized by a width 314 separating the first exit region from the second exit region.
  • the separation region includes a triangular shaped region -having an apex 316 defined by a radius of curvature of 0.15 mm and less and a base defined by the separation region.
  • the triangular region has a refractive index of about one, which can be essentially an air gap and/or other non-solid open region.
  • the apex of the triangular region is provided within a thickness of material 318 of the concentrator structure.
  • each of the concentrator elements includes a first corner structure 320 and a second corner structure 322 in a portion of the exit region.
  • the corner structure 322 is characterized by an exit radius curvature.
  • the exit radius curvature is predetermined in conjunction with the radius of curvature of the apex 316 to optimize performance of the solar cell.
  • the manufacturing costs, structural integrity, and/or strength may also be a consideration in determining the exit radius.
  • the exit radius is greater than a critical radius where the concentrator structure is likely to crack. More detailed discuss is provide below.
  • FIG 4 is a more detailed diagram of a notch structure for a solar cell concentrator according to an embodiment of the present invention.
  • This diagram is merely an example, which should not unduly limit the scope of the claims herein.
  • the apex of the triangular region includes a notch structure characterized by an apex region 401 and wall regions 403.
  • the wall regions are straight.
  • the wall region may be curved.
  • the notch structure describes a portion of a cross section of a triangular channel region provided between a first solar concentration element and a second solar concentration element.
  • the apex region is characterized by a radius of curvature 405.
  • the radius of curvature can be greater than about 0.001 mm.
  • the radius of curvature can range from 0.05 mm to about 0.15 mm.
  • a minimum of radius of curvature is provided to maintain a structure/mechanical integrity of the solar cell concentrator in the temperature range of about -40 deg Celsius and 85 deg Celsius in accordance with IEC (International Electrotechnical Commission ) 61215 specification according to a specific embodiment.
  • IEC International Electrotechnical Commission
  • FIG. 5 is a more detailed diagram illustrating a corner structure 506 of a concentrator element 502 according to an embodiment of the present invention.
  • an exit region 504 is optically coupled to a photovoltaic region 508 in a specific embodiment.
  • the corner structure 506 is characterized by an exit radius of curvature 510.
  • the exit radius of curvature can be greater than about 0.001 mm.
  • the exit radius of curvature can range from 0.025 to 0.15 mm.
  • the exit radius of the curvature is optimized to maintain an efficient transmission of electromagnetic radiation to the photovoltaic region in a specific embodiment.
  • the curvature 510 is determined using a variety of factors, such as the refractive index (and/or other optical properties) of the concentrator element, the angle of the exit aperture 316 illustrated in Figure 3, and/or other factors.
  • factors such as the refractive index (and/or other optical properties) of the concentrator element, the angle of the exit aperture 316 illustrated in Figure 3, and/or other factors.
  • the solar concentrator can be made of materials selected from acrylic, or diamond, or quartz, or glass, or a combination of those materials.
  • the solar concentrator is fabricated using a mold having an edge radius of curvature of less than 0.15 mm.
  • the material for making the concentrator can be injected through a fan gate, or a valve gate, or an extrusion filling the mold.
  • the structural components may include a compression component and a heating component. The heating component may generate heat during the molding process via current or through an external heating source.
  • the structural components may include a compression component and a heating component.
  • the heating component may generate heat during the molding process via current or through an external heating source.
  • a coupling region 602 can be provided between an exit region of a concentrator element and a photovoltaic region.
  • the exit region is optically coupled to the photovoltaic region using an optical coupling material within the coupling region.
  • optical coupling material can include optical grade epoxy, ethylene vinyl acetate (EVA), silicones, polyurethanes, and others.
  • the optical coupling material includes polyurethanes provided in a thickness of 0.025 to 0.25 mm.
  • Figure 7 is a plot of concentration ratio as a function of corner structure size of a solar cell concentrator according to an embodiment of the present invention.
  • This diagram is merely an example, which should not unduly limit the scope of the claims herein.
  • the vertical axis illustrates concentration ratio and the horizontal axis illustrates notch structure size or radius of curvature. The result was obtained using a solar cell concentrator with an entrance of 4 mm and an exit of 2 mm.
  • the concentration ratio generally decreases with an increase in exit radius of curvature of the corner structure.
  • a corresponding plot of irradiation loss as a function of corner structure is shown in Figure 8.
  • the vertical axis illustrates percent of light loss or irradiation loss and the horizontal axis illustrates exit radius of curvature of the corner structure.
  • the irradiation loss generally increases with an increase of exit radius.
  • the exit radius of curvature is optimized to allow for a maximum concentration ratio or a minimum scattering loss and to allow for maintaining mechanical/structural integrity of the solar cell concentrator in the temperature range between about -40 deg Celsius and 85 deg Celsius according to IEC 61215 specification according to a preferred embodiment.

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  • Microelectronics & Electronic Packaging (AREA)
  • Power Engineering (AREA)
  • Photovoltaic Devices (AREA)

Abstract

La présente invention concerne une structure de concentrateur pour cellule photovoltaïque. Cette structure comprend un premier élément concentrateur disposant d'une première région d'ouverture et d'une première région de sortie incluant une première région à surface postérieure et une première région de coin. La structure comprend également un deuxième élément concentrateur faisant partie intégrante du premier élément concentrateur. Le deuxième élément concentrateur comporte une deuxième région d'ouverture et une deuxième région de sortie incluant une deuxième région à surface postérieur et une deuxième région de coin. La structure inclut en outre un premier rayon de courbure de 0,25 mm au maximum caractérisant la première structure du coin et la deuxième structure du coin, une première région de couplage entre la première région de sortie et une première région de surface d'un premier dispositif photovoltaïque. La structure inclut en plus un deuxième rayon de courbure de 0,15 mm au maximum caractérisant une région entre le premier élément concentrateur et le deuxième élément concentrateur.
PCT/US2008/059170 2007-04-02 2008-04-02 Structure de cellule photovoltaïque comprenant une pluralité de concentrateurs à encoches et rayon défini, et procédé correspondant WO2008122047A1 (fr)

Applications Claiming Priority (8)

Application Number Priority Date Filing Date Title
US11/695,566 2007-04-02
US11/695,566 US20080236651A1 (en) 2007-04-02 2007-04-02 Solar cell concentrator structure including a plurality of concentrator elements with a notch design and method having a predetermined efficiency
US96994907P 2007-09-05 2007-09-05
US60/969,949 2007-09-05
US1913508P 2008-01-04 2008-01-04
US61/019,135 2008-01-04
US12/060,769 US20090056806A1 (en) 2007-09-05 2008-04-01 Solar cell structure including a plurality of concentrator elements with a notch design and predetermined radii and method
US12/060,769 2008-04-01

Publications (1)

Publication Number Publication Date
WO2008122047A1 true WO2008122047A1 (fr) 2008-10-09

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WO2011042517A2 (fr) 2009-10-08 2011-04-14 Photon B.V. Structure optique avec un sommet plat
WO2011050912A3 (fr) * 2009-10-30 2012-02-02 Docter Optics Gmbh Concentrateur solaire
WO2011050886A3 (fr) * 2009-10-30 2012-02-02 Docter Optics Gmbh Concentrateur solaire
WO2012031640A1 (fr) * 2010-08-30 2012-03-15 Docter Optics Gmbh Concentrateur solaire et procédé de production
WO2012048760A1 (fr) * 2010-10-14 2012-04-19 Docter Optics Gmbh Procédé de fabrication d'un concentrateur solaire
WO2012072187A3 (fr) * 2010-12-03 2012-08-23 Docter Optics Gmbh Concentrateur solaire

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US6609836B1 (en) * 2002-09-17 2003-08-26 The United States Of America As Represented By The Secretary Of The Navy Method for coupling fiber optic elements
US20060283495A1 (en) * 2005-06-06 2006-12-21 Solaria Corporation Method and system for integrated solar cell using a plurality of photovoltaic regions

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US6020553A (en) * 1994-10-09 2000-02-01 Yeda Research And Development Co., Ltd. Photovoltaic cell system and an optical structure therefor
US20030074976A1 (en) * 2001-09-04 2003-04-24 Jalees Ahmad Method and system for determining crack nucleation of a part subject to fretting fatigue
US6609836B1 (en) * 2002-09-17 2003-08-26 The United States Of America As Represented By The Secretary Of The Navy Method for coupling fiber optic elements
US20060283495A1 (en) * 2005-06-06 2006-12-21 Solaria Corporation Method and system for integrated solar cell using a plurality of photovoltaic regions

Cited By (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2011042517A3 (fr) * 2009-10-08 2011-08-25 Photon B.V. Structure optique avec un sommet plat
WO2011042517A2 (fr) 2009-10-08 2011-04-14 Photon B.V. Structure optique avec un sommet plat
CN102640296A (zh) * 2009-10-08 2012-08-15 太阳能优胜有限公司 具有平坦顶部的光学结构
AU2010311955B2 (en) * 2009-10-30 2014-03-20 Docter Optics Se Solar concentrator and production method
WO2011050912A3 (fr) * 2009-10-30 2012-02-02 Docter Optics Gmbh Concentrateur solaire
WO2011050886A3 (fr) * 2009-10-30 2012-02-02 Docter Optics Gmbh Concentrateur solaire
US9864181B2 (en) 2009-10-30 2018-01-09 Docter Optics Se Solar concentrator and production method thereof
CN102596827A (zh) * 2009-10-30 2012-07-18 博士光学有限公司 太阳能集中器及生产方法
CN102596827B (zh) * 2009-10-30 2015-01-21 博士光学有限公司 太阳能集中器及生产方法
ES2453203R1 (es) * 2009-10-30 2014-05-16 Docter Optics Gmbh Concentrador solar
AU2010311929B2 (en) * 2009-10-30 2014-03-20 Docter Optics Se Solar concentrator and production method thereof
WO2012031640A1 (fr) * 2010-08-30 2012-03-15 Docter Optics Gmbh Concentrateur solaire et procédé de production
CN103069579A (zh) * 2010-08-30 2013-04-24 博士光学有限公司 太阳能集中器以及制备方法
AT514004A5 (de) * 2010-08-30 2014-09-15 Docter Optics Se Solarkonzentrator
WO2012048760A1 (fr) * 2010-10-14 2012-04-19 Docter Optics Gmbh Procédé de fabrication d'un concentrateur solaire
AT514201B1 (de) * 2010-12-03 2014-11-15 Docter Optics Se Solarkonzentrator
AT514201A5 (de) * 2010-12-03 2014-11-15 Docter Optics Se Solarkonzentrator
WO2012072187A3 (fr) * 2010-12-03 2012-08-23 Docter Optics Gmbh Concentrateur solaire
US9139461B2 (en) 2010-12-03 2015-09-22 Doctor Optics SE Solar concentrator

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