| http://www.w3.org/ns/prov#value | - The hole trapping layer 19 can be comprised of various inorganic materials, such as selenium, selenium alloys including arsenic selenium, arsenic sulfur selenium, however, this layer is preferably comprised of a halogen doped selenium arsenic alloy as described hereinbefore, layer 19, ranging in thickness of from about 0.05 microns to about 5 microns, and preferably from about 0.1 micron to about
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