Modified amorphous semiconductors and method of making the same
First Claim
1. The method of making an amorphous semiconductor device comprising depositing on a substrate an amorphous semiconductor film including an amorphous semiconductor host matrix comprising silicon and oxygen and a modifier material comprising an alkali metal incorporated therein by codeposition of the same, and controlling the amounts of silicon and oxygen in the amorphous host matrix, wherein the silicon to oxygen ratio is represented by SiOx where x can be controlled from above 0 to 2, and the amount of alkali metal incorporated therein for controlling the energy gap and the room temperature electrical conductivity of the device.
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Abstract
An amorphous semiconductor film includes an amorphous semiconductor host matrix, such as silicon or silicon and oxygen, and a modifier material comprising an alkali metal, such as lithium, incorporated therein by codeposition of the same. The modifier material incorporated in the amorphous host matrix controls the electrical conductivity of the film and other phenomena associated therewith.
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Citations
21 Claims
- 1. The method of making an amorphous semiconductor device comprising depositing on a substrate an amorphous semiconductor film including an amorphous semiconductor host matrix comprising silicon and oxygen and a modifier material comprising an alkali metal incorporated therein by codeposition of the same, and controlling the amounts of silicon and oxygen in the amorphous host matrix, wherein the silicon to oxygen ratio is represented by SiOx where x can be controlled from above 0 to 2, and the amount of alkali metal incorporated therein for controlling the energy gap and the room temperature electrical conductivity of the device.
- 7. An amorphous semiconductor device comprising an amorphous semiconductor film deposited on a substrate and including an amorphous semiconductor host matrix comprising silicon and oxygen and a modifier material comprising an alkali metal incorporated therein which provides a supply of electrons and having an energy gap and an increased room temperature electrical conductivity, wherein the silicon to oxygen ratio is represented by SiOx where x can be controlled from above 0 to 2.
- 19. The method of making an amorphous semiconductor device comprising depositing on a substrate an amorphous semiconductor film including an amorphous semiconductor host matrix comprising silicon and a modifier material incorporated therein comprising lithium by codepositing the same, and controlling the amount of lithium incorporated in the amorphous host matrix, wherein small amounts of lithium decrease the room temperature electrical conductivity, increase the electrical activation energy and energy gap, and increase the photoconductivity of the device, and large amounts of lithium increase the room temperature electrical conductivity, decrease the electrical activation energy and the energy gap, and decrease the photoconductivity of the device.
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