摘要:
The present invention provides a photovoltaic module for converting solar energy into electrical energy. The module comprises a substrate having a relatively large first surface and a relatively small second surface. A first photovoltaic cell is mounted to the first surface, the first photovoltaic cell having a first response band. The module is positioned such that the solar energy is incident onto the active area of the first photovoltaic cell. A second photovoltaic cell substantially smaller than the first photovoltaic cell is mounted to the second surface of the substrate. The substrate is formed such that a portion of the solar energy transmitted by the first photovoltaic cell into the substrate is directed onto the active area of the second photovoltaic cell. Because of the smaller area of the second photovoltaic cell, the cost per unit cell area is lower than in conventional tandem cell designs.
摘要:
A method of bonding a cover glass to a semiconductor substrate having conductors thereon. The cover glass and the semiconductor substrate are placed in a relatively high voltage field and heated to induce ion drift in the glass and improved conductivity in the substrate. Additional localized heating softens the cover glass in the vicinity of the conductors permitting the cover glass to flow around the conductors and to be drawn into contact and bonded with the substrate.
摘要:
A parabolic primary mirror (10) has a concave specular surface (12) that is constructed and positioned to receive solar energy and focus it towards a focal point. A secondary mirror (14) having a convex specular surface (16) is constructed and positioned to receive focused solar energy from the primary mirror and focus it onto an annular receiver (18). The annular receiver (18) may include an annular array of optical elements (100) constructed to receive solar energy from the secondary specular surface (14) and focus it onto a ring of discrete areas. A ring of solar-to-electrical conversion units are positioned on the ring of discrete areas.
摘要:
A parabolic primary mirror (10) has a concave specular surface (12) that is constructed and positioned to receive solar energy and focus it towards a focal point. A secondary mirror (14) having a convex specular surface (16) is constructed and positioned to receive focused solar energy from the primary mirror and focus it onto an annular receiver (18). The annular receiver (18) may include an annular array of optical elements (100) constructed to receive solar energy from the secondary specular surface (14) and focus it onto a ring of discrete areas. A ring of solar-to-electrical conversion units are positioned on the ring of discrete areas.
摘要:
A solar energy system that includes a primary concentrator, a receiver having a plurality of photovoltaic cells, and a prefilter surrounding the receiver. The prefilter absorbs some of the radiation that is out of band with respect to the photovoltaic cells, and may include a conduit for a cooling fluid. The cells on the receiver are positioned such that each cell receives the same solar energy flux. The receiver may include a phase change material to protect the photovoltaic cells from excessive temperatures.
摘要:
A cryocrucible permits the introduction of ion clusters of a cryogen, like oxygen or nitrogen, to a vacuum chamber, and preferably comprises a liquid cryogen containment vessel connected to an expansion chamber through a solenoid-actuated valve, a cooling means for maintaining the cryogen as a liquid in the containment vessel, and a nozzle connecting the expansion chamber to the vacuum chamber. Liquid evaporates through the valve into the expansion chamber and, then, forms clusters when it expands further while passing through the nozzle into the vacuum chamber.
摘要:
The process comprises the following steps: (1) forming a glass sheet which defines a substrate layer for the solar cell product; (2) forming a diffusion barrier layer on at least one surface of the substrate; (3) forming a first electrically-conductive layer on the diffusion barrier, the first electrically-conductive layer being a first electrode in the solar cell product; (4) depositing small-grain polycrystalline silicon in a thin film, i.e., 10-100 micrometers, on the first electrode layer; (5) recrystallizing, typically by heating, the deposited polycrystalline silicon until it reforms into large-grain polycrystalline or single-crystal silicon; (6) forming a PN junction in the recrystallized silicon layer; and (7) forming a second electrically-conductive layer on the recrystallized silicon layer, the second electrically-conductive layer being a second electrode in the solar cell product. The solar cell product produced by the above-process may be fabricated in large surface area configurations, suitable for terrestrial as well as extra-terrestrial use, at relatively low cost.
摘要:
A parabolic primary mirror (10) has a concave specular surface (12) that is constructed and positioned to receive solar energy and focus it towards a focal point. A secondary mirror (14) having a convex specular surface (16) is constructed and positioned to receive focused solar energy from the primary mirror and focus it onto an annular receiver (18). The annular receiver (18) may include an annular array of optical elements (100) constructed to receive solar energy from the secondary specular surface (14) and focus it onto a ring of discreet areas. A ring of solar-to-electrical conversion units are positioned on the ring of discreet areas. A sun sensor that allows accurate solar tracking to keep mirror system aligned with the sun.
摘要:
Thermal isolation shields consisting of two glass slides separated by insulating standoffs are positioned upon the front radiation receiving surface of a solar cell and/or upon the back surface of the solar cell. One of the two glass plates is made from material selected to absorb and radiate electromagnetic wave energy with a wavelength above 5 microns to prevent overheating of the cell. The space between the two cover plates forms a thermal gap that is, if desired, bridged by a bimetallic strip. The strip is adhered to one of the plates and has a reverse bend to extend along the face surface of the opposed cover plate. The strip distorts under an increased temperature to break the bridge between the two plates and thereby isolates the solar cell from the thermal shield formed by the outer cover plate until there is a sufficient reduction in temperature at which the bimetallic strip reestablishes conductive contact between the cover plates. Each solar cell assembly in an array is adhered to a substrate by first bonding glass pads to the substrate and then heating the cell and glass pads to a temperature of about 400.degree. while applying an electrical potential of the order of 400 volts with the glass being negative potential with respect to the cell. A hermetic bond is achieved without the use of adhesives.
摘要:
Thermal isolation shields consisting of two glass slides separated by insulating standoffs are positioned upon the front radiation receiving surface of a solar cell and/or upon the back surface of the solar cell. One of the two glass plates is made from material selected to absorb and radiate electromagnetic wave energy with a wavelength above 5 microns to prevent overheating of the cell. The space between the two cover plates forms a thermal gap that is, if desired, bridged by a bimetallic strip. The strip is adhered to one of the plates and has a reverse bend to extend along the face surface of the opposed cover plate. The strip distorts under an increased temperature to break the bridge between the two plates and thereby isolates the solar cell from the thermal shield formed by the outer cover plate until there is a sufficient reduction in temperature at which the bimetallic strip reestablishes conductive contact between the cover plates. Each solar cell assembly in an array is adhered to a substrate by first bonding glass pads to the substrate and then heating the cell and glass pads to a temperature of about 400.degree. while applying an electrical potential of the order of 400 volts with the glass being negative potential with respect to the cell. A hermetic bond is achieved without the use of adhesives.