| abstract |
An electronic switch comprises a photosensitive semiconductor (1,11,12) and a light source (14,24) which, when actuated, illuminates the semiconductor and causes the latter to become conductive, the photosensitive semiconductor being a sintered mixture comprising, by weight, 58 - 72% of cadmium, 14.8 - 21% of selenium, 7 - 15% of tellurium, 7 - 12% of sulphur, 0.1 - 1% of chlorine, and 0.005 - 0.1% of copper. |