Infrared detector and manufacturing process
First Claim
1. The invention relates to an infrared detector including:
- a sensitive part comprisinga sensitive element comprising a layer of material in which the resistivity varies with the temperature,conducting elements carrying out the function of electrodes for the said detector and the function of infrared absorber;
at least one support element for the sensitive part capable of positioning the said sensitive part, electrically connecting it to a readout circuit and thermally insulating it from the readout circuit;
in which all conducting elements are placed on the same surface of the layer of temperature sensitive material.
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Accused Products
Abstract
An infrared detector includes a sensitive part having a sensitive element and conducting elements. The sensitive element includes a layer of material in which the resistivity varies with the temperature. The conducting elements perform the functions of electrodes for the detector and infrared absorber. At least one support element for the sensitive part is capable of positioning the sensitive part, electrically connecting the sensitive part to a readout circuit, and thermally insulating the sensitive part from the rest of the structure. All conducting elements are places on the same surface of the layer of temperature sensitive material. The detector is manufactured according to a forming and etching process.
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Citations
24 Claims
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1. The invention relates to an infrared detector including:
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a sensitive part comprising a sensitive element comprising a layer of material in which the resistivity varies with the temperature, conducting elements carrying out the function of electrodes for the said detector and the function of infrared absorber; at least one support element for the sensitive part capable of positioning the said sensitive part, electrically connecting it to a readout circuit and thermally insulating it from the readout circuit; in which all conducting elements are placed on the same surface of the layer of temperature sensitive material. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. Process for the manufacture of an infrared detector, which comprises the following steps, starting from a previously manufactured readout circuit made on a substrate:
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a) formation of a sacrificial layer; b) deposit of at least one conducting layer to make conducting elements; c) make at least one contact opening to the readout circuit by local etching of the conducting layer and the sacrificial layer; d) deposit of at least one conducting material and etching of this material in order to form the electrical connection between conducting elements and the readout circuit, the pattern thus being formed making up the support pillar; e) etching of the conducting layer deposited in step b) in order to define the patterns of the conducting elements; f) deposit of the temperature sensitive material on the assembly, and etching of the various layers located above the sacrificial layer in order to define the sensitive element and the support arm; g) etching of the sacrificial layer so as to release the sensitive part and the pillar. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21, 22, 23, 24)
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Specification