Photoconductor of cadmium selenide and aluminum oxide

A camera tube comprising:

• a. an evacuated envelope with a transparent portion,
• b. an electron beam forming and scanning means for scanning an electron beam along a path within the envelope;
• and
• c. a target mounted within the envelope in the path of the electron beam and including a major surface for receiving a light image transmitted through said transparent portion;
• the target including:
• 1. a photoconductive body including in a direction of thickness:
• i. a first material region substantially of n type electrical conductivity cadmium selenide;
• ii. a second material region substantially of aluminum oxide;
• iii. a transition region along an interfacing region between said first and second material regions consisting of a graded atomic transition of the material composition of said first and second material regions;
• and
• 2. a blocking contact within a portion of said photoconductive body including said transition and second material regions.

A photoconductive device comprising:

• a. a photoconductive body including in a direction of thickness:
• 1. a region substantially of n type electrical conductivity cadmium selenide, and
• 2. a transition region abutting said cadmium selenide region substantially of a graded atomic composition, progressing in a direction of thickness away from said cadmium selenide region, of initially cadmium selenide to a composition of cadmium and selenium with increasing amounts of aluminum and oxygen, said transition region including a blocking contact;
• b. contacting means for applying an electrical potential across opposed major surfaces of said body whereby charged carriers may be conducted through said body in said direction of thickness in accordance with light impinging on said body.

A camera tube comprising:

• a. an evacuated envelope with a transparent portion,
• b. an electron beam forming and scanning means for scanning an electron beam along a path within the envelope;
• and
• c. a target mounted within the envelope in the path of the electron beam and including a major surface for receiving a light image transmitted through said transparent portion;
• the target including:
• 1. a photoconductive body including in a direction of thickness;
• i. a region substantially of n type electrical conductivity cadmium selenide;
• ii. a transition region abutting said cadmium selenide region substantially of a graded atomic composition, progressing in a direction of thickness away from said cadmium selenide region, of initially cadmium selenide to a composition of cadmium and selenium with increasing amounts of aluminum and oxygen, said transition region including a blocking contact.