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Browse Prior Art Database

Devices having Enhanced Thermoelectric Voltages

IP.com Disclosure Number: IPCOM000086569D
Original Publication Date: 1976-Sep-01
Included in the Prior Art Database: 2005-Mar-03
Document File: 2 page(s) / 27K

Publishing Venue

IBM

Related People

Cuomo, JJ: AUTHOR [+2]

Abstract

Microthermal couples are produced in the form of a thin film for producing large thermoelectric voltages in the plane of the film in response to incident light normal to the film. Structures using alternate depositions of materials having different thermopower have been utilized. In the present structure, a single deposition and subsequent heat treatment form a structure having alternating periodicity of two different materials having two different thermopowers. This eliminates a second evaporation step.

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Devices having Enhanced Thermoelectric Voltages

Microthermal couples are produced in the form of a thin film for producing large thermoelectric voltages in the plane of the film in response to incident light normal to the film. Structures using alternate depositions of materials having different thermopower have been utilized. In the present structure, a single deposition and subsequent heat treatment form a structure having alternating periodicity of two different materials having two different thermopowers. This eliminates a second evaporation step.

In the drawing, a single phase thin-film structure is deposited having slanted columns. The film comprises an alloy of two specially selected materials, e.g., Cr x Al and Nb x Bi. Upon heat treatment, these materials segregate, thereby forming alternating periodic structures of the two materials. This segregation occurs because the two materials are completely immiscible at elevated temperatures.

In Fig. 1A, deposition of the alloy is at an angle so that slanted columns are formed on the substrate. Later heat treatment produces the structure of Fig. 1B. When light is incident on the structure, a thermoelectric voltage will be produced in the plane of the film.

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