Large-area heat sink structure for large power semiconductor device
A technology with a heat dissipation structure and a large area, which is used in semiconductor devices, semiconductor/solid-state device components, and electric solid-state devices to achieve the effects of reducing chip thermal resistance, low cost, and short heat flow paths.
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[0037] Example 1
[0038] The structure of the sapphire substrate AlGaN / GaN HEMT large-area flip-chip welding chip disclosed in the present invention is as figure 2 Shown: 1 is a sapphire substrate, 2 is an epitaxial layer, on which AlGaN / GaN HEMT devices are fabricated, 3 is the source pad of the device, 4 is the gate electrode, 5 is the drain pad, and 9 is the copper bump Point 10 is a lead-tin solder joint, 11 and 12 are gold and copper pads on the Si-based heat sink 13, 7 is the heat sink electrode, and 14 is a silicon nitride thermally conductive insulating film. During the chip manufacturing process, HEMT devices are made by conventional technology; then the silicon nitride thermally conductive insulating film is deposited on the front of the chip by plasma enhanced chemical vapor deposition (PECVD); then the electrode lead-out holes are opened on the thermally conductive insulating film to make adhesion Layer and flip-chip solder bumps; At the same time, a similar process ...
Example Embodiment
[0041] Example 2
[0042] The structure of the sapphire substrate AlGaN / GaN HEMT large-area flip-chip welding chip disclosed in the present invention is as Figure 6 Shown: 1 is a sapphire substrate, 2 is an epitaxial layer, on which AlGaN / GaN HEMT devices are fabricated, 3, 4, and 5 are the source pads, gate electrodes, and drain pads of the device, and 9 is copper For the bumps, 14 is a silicon nitride thermally conductive insulating film, 81 is a heat sink under Si base, and 82 is a heat sink on Si base. The manufacturing process of the device is basically the same as that of Embodiment 1, except that the substrate is thinned, and a heat sink is installed on one side of the substrate to form a double-sided heat dissipation structure, which further reduces the thermal resistance of the chip. Experiments have proved that the flip-chip AlGaN / GaN HEMT chip with the double-sided heat dissipation structure produced in this example is compared with the conventional flip-chip HEMT chip,...
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