Semiconductor device
There is provided a semiconductor device 100 , comprising: at least one semiconductor chip 5 , and a structure 2 thermally coupled to the at least one semiconductor chip 5 , wherein the structure 2 comprises a surface located within an interior of the semiconductor device, and the surface comprises a groove 12 ; and a sensor 16 comprising an optical fibre 13 passing through the groove 12 , wherein the sensor 16 is configured to sense a temperature of the at least one semiconductor chip 5.
1 . A semiconductor device, comprising:
at least one semiconductor chip, and
a structure electrically and thermally coupled to the at least one semiconductor chip, wherein the structure comprises a surface located within an interior of the semiconductor device, and the surface comprises a groove, and wherein the structure is separate from the at least one semiconductor chip; and
a sensor comprising an optical fibre passing through the groove, wherein the sensor is configured to sense a temperature of the at least one semiconductor chip, wherein the sensor is held within the groove by friction with walls of the groove.
2 . A semiconductor device according to claim 1 , further comprising at least one material arranged immediately between the at least one semiconductor chip and the structure, wherein the at least one material has a thermal resistance of less than or equal to 15° C.·mm 2 /W.
3 . A semiconductor device according to claim 1 , wherein the sensor is a fibre Bragg grating sensor.
4 . A semiconductor device according to claim 1 , wherein:
the at least one semiconductor chip comprises a plurality of semiconductor chips;
the sensor comprises a plurality of optical sensing units associated with the optical fibre, and
positions of the plurality of optical sensing units are aligned with positions of the plurality of semiconductor chips so as to sense local temperatures of the plurality of semiconductor chips, respectively.
5 . A semiconductor device according to claim 1 , wherein the structure is a metallic structure.
6 . A semiconductor device according to claim 1 , wherein the structure is a rigid structure.
7 . A semiconductor device according to claim 1 , wherein the semiconductor device is a press-pack power semiconductor device.
8 . A semiconductor device according to claim 7 , wherein the structure comprises a housing electrode of the press-pack power semiconductor device.
9 . A semiconductor device according to claim 7 , wherein the structure comprises a strain buffer of the press-pack power semiconductor device.
10 . A semiconductor device according to claim 7 , wherein the sensor is positioned within about millimeters of a surface of the at least one semiconductor chip.
11 . A semiconductor device according to claim 1 , wherein the structure comprises a baseplate.
12 . A semiconductor device according to claim 1 , wherein the sensor comprises an elastic sheath surrounding at least a part of the optical fibre.
13 . A semiconductor device according to claim 12 , wherein the sensor comprises at least one optical sensing unit, and the at least one optical sensing unit is not covered by the elastic sheath.
14 . A semiconductor device according to claim 1 , wherein the groove comprises two opposing side walls and a rounded wall connecting the two side walls.
15 . A semiconductor device according to claim 1 , wherein the sensor is configured to sense an operating parameter of the semiconductor device, the operating parameter comprising one or more of a strain, a stress, a magnetic field, or an electric field experienced by the at least one semiconductor chip.
16 . A method of mounting a sensor in a semiconductor device, the semiconductor device comprising at least one semiconductor chip and a structure, the sensor comprising an optical fibre, wherein the sensor is configured to sense a temperature of the at least one semiconductor chip, the method comprising:
forming a groove at a surface of the structure;
inserting the optical fibre into the groove; and
thermally and electrically coupling the structure to the at least one semiconductor chip such that the surface is located within an interior of the semiconductor device, wherein the sensor is held within the groove by friction with walls of the groove, and the structure is separate from the at least one semiconductor chip.
17 . A method of mounting a sensor in a semiconductor device according to claim 16 , wherein inserting the optical fibre into the groove comprises forming an interference fit between the optical fibre and the groove.
18 . A method of mounting a sensor in a semiconductor device according to claim 17 , wherein forming an interference fit comprises press fitting or shrink fitting.