Silicon solar cells.

摘要

A substrate (1) is made for silicon solar cells by heating a sheet of large-grained silicon steel at a temperature of at least about 1300°C in an atmosphere of hydrogen and tungsten hexafluoride (or hexachloride) at a partial pressure ratio of hydrogen to tungsten hexafluoride of about 3 to about 6 to deposit an epitaxial layer of tungsten (3) on said sheet of silicon steel. Epitaxial silicon (4) can then be deposited in a conventional manner on the layer of epitaxial tungsten.

With such substrate used. diffusion of iron into the silicon layer which would otherwise make the cell ineffective is minimized.