Abstract:
A gas sensor on a semiconductor substrate. The gas sensor includes an elongate sensor element extending across an opening and has first and second opposed surfaces exposed for contact with a gas to be sensed. The first surface faces away from a major surface of the substrate. The second surface faces toward said major surface. The electrical conductivity of the elongate sensor element is sensitive to a composition and/or concentration of said gas to which the opposed first and second surfaces are exposable. The gas sensor further includes a support structure arranged to increase the mechanical robustness of the gas sensor by supporting the elongate sensor element in the opening.
Abstract:
The light dose received by perishable goods is an important parameter in determining the of those goods. A light sensor (30) is described having a photosensitive element (18) which changes its material property according to the light dose received. This change can be detected electrically by electrodes (12, 14) in the light sensor. Because the change in material property is permanent, this removes the need for a memory to store a value representing the light dose received by the light sensor.
Abstract:
Disclosed is an integrated circuit comprising a substrate (10) including at least one light sensor (12); an interconnect structure (20) over the substrate; at least one passivation layer (30) over the interconnect structure, said passivation layer including a first area over the at least one light sensor; and a gas sensor such as a moisture sensor (50) at least partially on a further area of the at least one passivation layer, wherein the gas sensor comprises a gas sensitive layer (46') in between a first electrode (42) and a second electrode (44), the gas sensitive layer further comprising a portion (46") over the first area. A method of manufacturing such an IC is also disclosed.
Abstract:
A gas sensor on a semiconductor substrate. The gas sensor includes an elongate sensor element extending across an opening and has first and second opposed surfaces exposed for contact with a gas to be sensed. The first surface faces away from a major surface of the substrate. The second surface faces toward said major surface. The electrical conductivity of the elongate sensor element is sensitive to a composition and/or concentration of said gas to which the opposed first and second surfaces are exposable. The gas sensor further includes a support structure arranged to increase the mechanical robustness of the gas sensor by supporting the elongate sensor element in the opening.
Abstract:
Disclosed is an integrated circuit comprising a substrate (10) carrying a plurality of circuit elements; a metallization stack (12,14,16) interconnecting said circuit elements, said metallization stack comprising a patterned upper metallization layer comprising a first metal portion (20) and a second metal portion (21); a passivation stack (24,26,28) covering the metallization stack; a gas sensor including a sensing material portion (32,74) on the passivation stack; a first conductive portion (38) extending through the passivation stack connecting a first region of the sensing material portion to the first metal portion; and a second conductive portion (40) extending through the passivation stack connecting a second region of the sensing material portion to the second metal portion. A method of manufacturing such an IC is also disclosed. The gas sensor measures the gas concentration either by measuring the resistivity of the sensing material as the test gas is absorbed in the sensing material or by measuring the temperature change of the sensing material due to changes of thermal conductivity of the test gas.
Abstract:
Disclosed is an integrated circuit comprising a substrate (10) including semiconductor devices and a metallization stack (20) over said substrate for interconnecting said devices, the metallization stack comprising a cavity (36), and a thermal conductivity sensor comprising at least one conductive portion (16, 18) of said metallization stack suspended in said cavity. A method of manufacturing such an IC is also disclosed.
Abstract:
Disclosed is an integrated circuit comprising a substrate (10) carrying a plurality of circuit elements; a metallization stack (12,14,16) interconnecting said circuit elements, said metallization stack comprising a patterned upper metallization layer comprising a first metal portion (20) and a second metal portion (21); a passivation stack (24,26,28) covering the metallization stack; a gas sensor including a sensing material portion (32,74) on the passivation stack; a first conductive portion (38) extending through the passivation stack connecting a first region of the sensing material portion to the first metal portion; and a second conductive portion (40) extending through the passivation stack connecting a second region of the sensing material portion to the second metal portion. A method of manufacturing such an IC is also disclosed. The gas sensor measures the gas concentration either by measuring the resistivity of the sensing material as the test gas is absorbed in the sensing material or by measuring the temperature change of the sensing material due to changes of thermal conductivity of the test gas.