Development of economical improved thick film solar cell contact. Quarterly report No. 1
Materials were surveyed to provide candidates for an all metal electrode paste system. These consisted of a major constituent metal powder, a low melting metal powder suitable for a liquid phase sintering medium, and a powder material suitable as an etchant for silicon dioxide at sintering temperatures. By means of thermal gravimetric analysis a suitable binder was identified for low temperature fired inks. The all metal ink concept was first demonstrated with the silver system to avoid the problems of limited process windows encountered with base metal systems. A number of solid materials capable of selectively etching silicon dioxide at modest temperatures were identified. One of these, silver fluoride, has yielded very good results, wetting the silicon surface after removing a thick (3000 A) silica layer. Silver pastes containing the above materials have been prepared. A paste with silver fluoride was screened onto N-type silicon with 5..cap omega..cm resistivity. The resulting contact pads had excellent adhesion but were not electrically ohmic. Another metal ink paste, incorporating boric acid, gave substantially lower resistances; however, it would not pass a 1-hour boiling DI water immersion without losing scratch resistance.
- Research Organization:
- Ross (Bernd) Associates, San Diego, CA (USA)
- DOE Contract Number:
- NAS-7-100-955164
- OSTI ID:
- 5949645
- Report Number(s):
- DOE/JPL/955164-1
- Country of Publication:
- United States
- Language:
- English
Similar Records
Development of economical improved thick film solar cell contact. Quarterly report No. 3, May-July 1979
Development of an all-metal thick film cost effective metallization system for solar cells. Final report, May 1980-January 1983
Related Subjects
SILICON OXIDES
ETCHING
SILICON SOLAR CELLS
ELECTRIC CONTACTS
SILVER FLUORIDES
SCREEN PRINTING
BORIC ACID
ELECTRICAL PROPERTIES
INKS
METALS
POWDERS
SINTERING
SOLUBILITY
CHALCOGENIDES
DEPOSITION
DIRECT ENERGY CONVERTERS
ELECTRICAL EQUIPMENT
ELEMENTS
EQUIPMENT
FABRICATION
FLUORIDES
FLUORINE COMPOUNDS
HALIDES
HALOGEN COMPOUNDS
HYDROGEN COMPOUNDS
INORGANIC ACIDS
OXIDES
OXYGEN COMPOUNDS
PHOTOELECTRIC CELLS
PHOTOVOLTAIC CELLS
PHYSICAL PROPERTIES
SILICON COMPOUNDS
SILVER COMPOUNDS
SOLAR CELLS
SURFACE COATING
SURFACE FINISHING
TRANSITION ELEMENT COMPOUNDS
140501* - Solar Energy Conversion- Photovoltaic Conversion