低工作温度热电红外探测器的性能研究

R. Fettig, T. Henkel, E. Mueller
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引用次数: 0

摘要

作为卡西尼号土星任务的一部分,在CIRS实验中,热电红外探测器已经被开发和建造,可以在170 K的温度下工作。p型和n型热电腿焊接在金属化陶瓷衬底上,彼此隔离。锥体腿是用电火花加工成形的。金字塔上焊接了一层薄薄的金箔,并将其涂黑,以提高辐射的吸收。进行了表征测量,以将探测器的性质与制备过程相关联。热电行为是通过测量从液氮到室温的电流电压特性来描述的。用Bi/sub 0.4/Sb/sub 0.6/)/sub 2/Te/sub 3/ (p型)和Bi/sub 2/(Te/sub 0.95/Se/sub 0.95/)/sub 3/ (n型)组成的材料制备探测器。在低于室温的温度下,该材料被掺杂到具有最大的性能值。研究发现,电火花加工改变了热电材料的性能,电蚀刻可以去除退化层。电蚀刻探测器的性能更接近于原始材料的预期值。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Investigations of the properties of a thermoelectric IR-detector for low working temperature
Thermoelectric IR-detectors have been developed and built to work at a temperature of 170 K in the CIRS experiment as part of the CASSINI mission to Saturn. Thermoelectric legs of p and n-type are soldered to a metallized ceramic substrate, isolated one from another. Pyramidal legs are formed by electric discharge machining (EDM). A thin gold foil is welded to the pyramides and blackened for high absorption of radiation. Characterization measurements were carried out to correlate detector properties to the preparation process. Thermoelectric behavior is described by measuring the current-voltage characteristics from liquid nitrogen up to room temperature. Materials of the composition (Bi/sub 0.4/Sb/sub 0.6/)/sub 2/Te/sub 3/ (for p type) and Bi/sub 2/(Te/sub 0.95/Se/sub 0.95/)/sub 3/ (for n-type) have been used for detector preparation. The material was doped to have maximum figure of merit at temperatures below room temperature. It has been found that the EDM process changes the properties of the thermoelectric material and that electro etching can remove degraded layers. Electro etched detectors exhibit properties which are closer to the values expected from the original material.
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