Metal working – Method of mechanical manufacture – Assembling or joining
Patent
1984-03-23
1985-04-16
Weisstuch, Aaron
Metal working
Method of mechanical manufacture
Assembling or joining
29572, 29575, 29584, 29DIG16, 156345, 156627, 118712, 204224R, 204224M, H01L 21306, H01L 3118
Patent
active
045106746
ABSTRACT:
Systems and methods for detecting and eliminating short circuit current paths through photovoltaic devices of the type including at least one semiconductor region overlying a substrate and a layer of conductive light transmissive material overlying the at least one semiconductor region are disclosed. The short circuit current paths which are eliminated extend through the at least one semiconductor region from the substrate to the layer of conductive light transmissive material. The resistivity of the short circuit current path is increased substantially at the interface between the conductive light transmissive material and the semiconductor region by isolating electrically the conductive light transmissive material from the short circuit current path.
The isolation can be provided by removing the transparent conductive material from electrical contact or connection with the short circuit current path. The isolation also can be provided by depositing a body of insulating material onto the semiconductor region over an area including a short circuit current path prior to the deposition of the conductive light transmissive material. Further, the short circuit current path can be detected and located by applying a voltage to discrete areas of the device through a conductive solution which path then can be eliminated as described above.
The system can form part of a continuous or batch production system for making photovoltaic devices or can be performed at a location remote from the continuous or batch production system. A plurality of side-by-side sources of electrolyte, each making discrete surface area contact with the conductive light transmissive material or a single elongated electrolyte source extending across the entire width of the device can be provided so that the device can be continuously moved through the system for the continuous detection and elimination of short circuit current paths across the entire width and length of the device.
REFERENCES:
patent: 4385971 (1983-05-01), Swartz
patent: 4420497 (1983-12-01), Tickle
Cannella Vincent D.
Izu Masatsugu
Sovonics Solar Systems
Weisstuch Aaron
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