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Thermoelectric Detector

IP.com Disclosure Number: IPCOM000082907D
Original Publication Date: 1975-Feb-01
Included in the Prior Art Database: 2005-Feb-28
Document File: 2 page(s) / 53K

Publishing Venue

IBM

Related People

Tynan, EE: AUTHOR [+2]

Abstract

Prior transverse thermoelectric detectors have a responsivity that is geometry dependent. The proposed structure minimizes this effect.

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Thermoelectric Detector

Prior transverse thermoelectric detectors have a responsivity that is geometry dependent. The proposed structure minimizes this effect.

Certain metallic films exhibit a transverse thermoelectric effect when illuminated with light normal to the plane of the film. This effect has been suggested for use in a wideband, fast responding light detector. However, the difficulty with the detectors proposed so far is that the response is somewhat a function of geometry.

As shown in Fig. 1, for a small spot of light incident on a wide detector there is a large spreading resistance, giving rise to circulating currents which diminish the output voltage. However this same signal, incident on a narrow strip shown in Fig. 2, produces a greatly enhanced signal compared to that of Fig. 1. For this geometry a large beam is only partially intercepted and results in a small signal. These effects have been observed experimentally. The proposed geometry and structure largely eliminates this difference in responsivity, and provides maximum responsivity for all incident beams.

The proposed geometry is shown in Fig. 3, and consists of a series of narrow stripes, oriented with the long axis in the plane of the evaporant deposition. Each stripe can act as a small battery with the polarity fixed by the evaporation angle and all polarities are the same for the case shown. The parallel stripes are fabricated through a mask with the evaporant material consisting of Mo, W...