| 摘要 |
710,804. Photo-electric devices. WESTERN ELECTRIC CO., Inc. March 21, 1952, [March 21, 1951.] No. 7320/52. Class 37. A photo-electric device comprises a body of semiconductive material having two zones of one conductivity type separated by and contiguous with a zone of opposite conductivity type, the thickness of which zone in the direction providing separation is not greater than the diffusion length of charge carriers normally in the minority therein, means for impressing a biasing potential between the two zones of one conductivity and means for permitting light to fall on a face of the body to which all three zones extend. The intermediate zone may be of P-type material and of thickness not greater than a few lengths of a millimetre. The incident light may, as shown in Fig. 1, fall on the P-type zone i and on small contiguous portions of the N-type zones 10A, 10B. The N-type zones have electrodes or terminals 14A, 14B connected to a battery 12 through a load resistance 13. Alternatively, the light may fall on the P-type zone, on either of the N-type zones, or on the P-type zone and a portion of one of the N-type zones. The germanium may be replaced by silicon. A composite germanium crystal having the zones indicated in Fig. 1 may be produced by the method described in Specification 706,858, and the surface on which the light impinges preferably has a mirror finish completed by a metallic coating deposited electrolytically from antimony oxychloride. The effect of the biasing battery in relation to the increased conductivity the device in response to incident light is explained in the Specification. |
