THERMALLY EFFICIENT PACKAGING FOR A PHOTONIC DEVICE
The present disclosure provides a method of packaging for a photonic device, such as a light-emitting diode device. The packaging includes an insulating structure. The packaging includes first and second conductive structures that each extend through the insulating structure. A substantial area of a bottom surface of the light-emitting diode device is in direct contact with a top surface of the first conductive structure. A top surface of the light-emitting diode device is bonded to the second conductive structure through a bonding wire.
1 . An apparatus comprising a packaging for a light-emitting diode (LED) device, the packaging includes:
an insulating structure; and
first and second conductive structures that each extend through the insulating structure;
wherein:
a substantial area of a bottom surface of the LED device comes into contact with a top surface of the first conductive structure; and
a top surface of the LED device is bonded to the second conductive structure through a bonding wire.
2 . The apparatus of claim 1 , wherein the insulating structure includes a photoresist material.
3 . The apparatus of claim 1 , wherein the first conductive structure includes:
a top conductive pad that is disposed over the insulating structure and that comes into contact with the LED device;
a plurality of conductive columns disposed within the insulating structure and below the top conductive pad; and
a bottom conductive pad that is disposed within the insulating structure and below the conductive columns.
4 . The apparatus of claim 3 , wherein:
the insulating structure includes a plurality of insulating columns; and
the conductive columns are interleaved with the insulating columns.
5 . An apparatus comprising a packaging structure for a photonic device, the packaging structure includes:
an insulating structure; and
a thermally conductive structure partially disposed in the insulating structure;
wherein a substantial portion of a surface of the photonic device is in direct contact with the thermally conductive structure.
6 . The apparatus of claim 5 , wherein the insulating structure includes a photo-sensitive material.
7 . The apparatus of claim 5 , wherein the surface of the photonic device is one of a top surface and a bottom surface, and wherein the entire portion of one of the top and bottom surfaces is in direct contact with the thermally conductive structure.
8 . The apparatus of claim 5 , wherein:
the packaging structure further includes a first conductive pad and a bonding wire;
the thermally conductive structure includes second and third conductive pads that are disposed over the insulating structure;
the first conductive pad is in direct contact with a first surface of the photonic device and is bonded to a first end of the bonding wire;
the second conductive pad is in direct contact with a second surface of the photonic device, the second surface being opposite from the first surface; and
the third conductive pad is bonded to a second end of the bonding wire, the first and second ends being opposite ends of the bonding wire.
9 . The apparatus of claim 5 , wherein the thermally conductive structure includes first and second conductive pads and a plurality of conductive features, the conductive features being disposed between the first and second conductive pads and interleaving with portions of the insulating structure.
10 . The apparatus of claim 9 , wherein the conductive features each have:
a first surface that is in direct contact with the first conductive pad; and
a second surface that is in direct contact with the second conductive pad; and wherein:
the first conductive pad and the conductive features are disposed in the insulating structure; and
the second conductive pad is disposed between the conductive features and the photonic device.
11 . The apparatus of claim 9 , wherein:
one of the portions of the insulating structure has a first lateral dimension value;
one of the conductive features has a second lateral dimension value, the first and second lateral dimension values being measured in a horizontal direction; and
a ratio between the first and second lateral dimension values is in a range from approximately 0.5 to approximately 5.
12 . A method of packaging a light-emitting diode (LED) device, comprising:
forming an insulating structure;
forming a thermally conductive structure partially in the insulating structure;
providing the LED device, the LED device having a top surface and a bottom surface; and
bonding the LED device to the thermally conductive structure, the bonding being carried out in a manner so that a substantial portion of one of the top and bottom surfaces of the LED device is in direct contact with the thermally conductive structure.
13 . The method of claim 12 , wherein the forming the insulating structure is carried out in a manner so that the insulating structure includes a photo-sensitive material.
14 . The method of claim 12 , wherein the bonding the LED device is carried out in a manner so that an entire portion of one of the top and bottom surfaces of the LED device is in direct contact with the thermally conductive structure.
15 . The method of claim 12 , wherein:
the forming the thermally conductive structure is carried out in a manner so that the thermally conductive structure includes:
a first conductive pad that is disposed over the LED device; and
second and third conductive pads that are disposed over the insulating structure;
the bonding the LED device is carried out in a manner so that:
the first conductive pad is in direct contact with the top surface of the LED device; and
the second conductive pad is in direct contact with the bottom surface of the LED device;
and further including bonding the first and third conductive pads to opposite ends of a bonding wire.
16 . The method of claim 12 , wherein the forming the thermally conductive structure includes:
forming a first conductive pad in the insulating structure;
forming a plurality of conductive features over the first conductive pad, the conductive features interleaving with portions of the insulating structure; and
forming a second conductive pad over the conductive features and over the insulating structure.
17 . The method of claim 16 , wherein the bonding the LED device is carried out so that the surface of the LED device is in direct contact with the second conductive pad.
18 . The method of claim 16 , wherein:
the forming the insulating structure includes forming the portions of the insulating structure by forming a photoresist layer over the first conductive pad and patterning the photoresist layer using a photolithography process, the patterned photoresist layer being the portions of the insulating structure, the portions of the insulating structure having a plurality of openings; and
the forming the conductive features includes forming a conductive material in the openings using a plating process.
19 . The method of claim 18 , wherein the forming the portions of the insulating structure is carried out in a manner so that:
one of the portions of the insulating structure has a first lateral dimension value;
one of the conductive features has a second lateral dimension value, the first and second lateral dimension values being measured in the same direction; and
a ratio between the first and second lateral dimension values is in a range from approximately 0.5 to approximately 5.
20 . The method of claim 12 , wherein the forming the insulating structure is carried out so that the insulating structure is formed over a carrier substrate, and further including:
molding the LED device;
attaching the molded LED device to a dicing frame; and
removing the carrier substrate.