摘要:
Electrical interconnections for a large area photovoltaic cells, electrical interconnections for adjacent large area photovoltaic cells and the methods of producing those connections are disclosed herein. The cells are, preferably, of the type which include a plurality of electrically isolated, small area segments sharing a common substrate, a semiconductor body atop the substrate and a transparent, conductive coating atop the semiconductor body. The electrical interconnections include: an electrically-conductive strip interconnecting the small area segments of each large area to provide a first electrode of that cell; and access to the substrate from the layered surface of each large area cell to provide the second electrode of that cell. The electrodes may be electrically-interconnected in series or parallel.
摘要:
An electroplated substrate, characterized by a substantially reduced number of surface defects, for the fabrication of thin film electronic devices. The substrate is prepared in an electroforming process by electroplating onto and removing a metallic layer from the surface of a specifically prepared, substantially defect-free mandril. The substrate may be provided with a preselected surface finish by either (1) texturing the mandril or (2) controlling the parameters of the electroplating process to control the morphology of the deposit. The substrate is especially adapted for the fabrication of thin film photoresponsive devices which incorporate specular or diffuse back reflectors, since the texture may be controlled to provide for the appropriate type of reflectivity. Large area, thin film semiconductor devices incorporating the electroplated substrate are readily scribed to form electrically isolated small area segments for the fabrication of modules, arrays and the like.
摘要:
An improved semiconductor device, adapted to provide electrical current in response to light energy incident thereon, includes a first electrode, an active semiconductor body atop the first electrode, a second electrode atop the semiconductor body, and at least one defect region which is capable of providing a low resistance shunt path for the flow of electrical current between the electrodes of the device. The improvement comprises a continuous transparent barrier layer (1) operatively disposed between the semiconductor body and one of the electrodes of the device and (2) adapted to decrease the flow of electrical current through the at least one defect region of the semiconductor device. The barrier layer is formed from a magnesium fluoride based material. Methods of (1) fabricating improved semiconductor devices and (2) preventing operational mode failures due to latent detents are also disclosed.
摘要:
Large area photovoltaic devices are defined by applying a pattern of electrically-insulating material directly atop the exposed surface of the semiconductor material. Methods of producing these photovoltaic devices in a continuous or batch process are also disclosed herein. Each large area device may include a matrix of electrically-isolated segments, each segment including a common substrate, a semiconductor body atop the substrate, and a transparent, electrically-conductive coating atop the semiconductor layer. Each large area photovoltaic device may include additionally or independently thereof, an electrically-inactive region also defined by the insulating material. The instant method of producing the photovoltaic devices eliminates the scribing steps required by prior art processes, while the product includes a boundary which separates the adjacent, electrically-isolated segments.
摘要:
An upstream cathode system for use with glow discharge deposition apparatus, said apparatus adapted for the production of large area photovoltaic devices. In such apparatus, process gases are commonly introduced into a deposition chamber from a gas manifold disposed on the upstream side of a substrate. As the process gases are drawn across the surface of the substrate, they are continuously disassociated and recombined under the influence of an electromagnetic field developed by a deposition cathode or microwave generator. By providing a precathode system, upstream of the deposition cathode or microwave generator, (1) impurities in the process gases, (2) contaminants from the walls of the deposition chamber and (3) initially disassociated and recombined process gas compositions may be deposited onto and collected from a collection plate disposed upstream of the substrate. In this manner, higher order chains of the process gases are subjected to the upstream electromagnetic field and are therefore more easily broken down by the deposition cathode and deposited onto the substrate in desired lower order chains and compositions so as to provide improved electrical properties.
摘要:
An improved large area photovoltaic device includes a plurality of electrically interconnected smaller area cells. The smaller area cells each have a laterally disposed bus bar and are disposed in overlapping relationships so that the bus bar of a given cell is beneath the substrate of the adjacent overlapping cell. In this manner the surface of the resulting large area device available for photovoltaic power generation is maximized. Also disclosed herein are methods for the manufacture of the improved device.
摘要:
An improved semiconductor device, adapted to provide electrical current in response to light energy incident thereon, includes a first electrode, an active semiconductor body atop the first electrode, a second electrode atop the semiconductor body, and at least one defect region which is capable of providing a low resistance shunt path for the flow of electrical current between the electrodes of the device. The improvement comprises a continuous transparent barrier layer (1) operatively disposed between the semiconductor body and one of the electrodes of the device and (2) adapted to decrease the flow of electrical current through the at least one defect region of the semiconductor device. The barrier layer is formed from a material chosen from the group consisting essentially of oxides, nitride and carbides of: indium, tin, cadmium, zinc, antimony, silicon, chromium and mixtures thereof. Methods of (1) fabricating improved semiconductor devices and (2) preventing operational mode failures due to latent detents are also disclosed.
摘要:
An electroplated substrate, characterized by a substantially reduced number of surface defects, for the fabrication of thin film electronic devices. The substrate is prepared in an electroforming process by electroplating onto and removing a metallic layer from the surface of a specifically prepared, substantially defect-free mandril. The substrate may be provided with a preselected surface finish by either (1) texturing the mandril or (2) controlling the parameters of the electroplating process to control the morphology of the deposit. The substrate is especially adapted for the fabrication of thin film photoresponsive devices which incorporate specular or diffuse back reflectors, since the texture may be controlled to provide for the appropriate type of reflectivity. Large area, thin film semiconductor devices incorporating the electroplated substrate are readily scribed to form electrically isolated small area segments for the fabrication of modules, arrays and the like.
摘要:
An upstream or predeposition cathode system for use with glow discharge deposition apparatus, said apparatus adapted for the continuous production of large area photovoltaic devices. In such apparatus, process gases are commonly introduced into a deposition chamber from a gas manifold disposed upstream of a substrate. As the process gases are drawn across the surface of the substrate, they are disassociated and recombined under the influence of an electromagnetic field developed by a deposition cathode or microwave generator. By providing a precathode system upstream of the deposition cathode or microwave generator, (1) impurities in the process gases, (2) contaminants from the walls of the deposition chamber and (3) initially disassociated and recombined process gas compositions may be deposited onto and collected from a collection plate disposed upstream of the substrate. In this manner, the process gases subjected to the upstream electromagnetic field are more easily broken down by the deposition cathode and deposited onto the substrate in desired chemical combinations and compositions so as to provide improved electrical, chemical and optical properties. Also disclosed herein is the use of such a precathode assembly to aid in the high speed deposition of homogeneous, amorphous, powder-free semiconductor material of uniform thickness across the entire width of the substrate.
摘要:
Apparatus for and a method of confining the ionized plasma developed during the glow discharge deposition of thin film semiconductor alloy material to preselected portions of the plasma region so as to prevent etching and deposit only uniform, nonhomogeneous semiconductor alloy material.