Passivation layer for packaged integrated circuits
First Claim
1. A process for forming a passivated integrated circuit device, comprising:
- mounting a die onto a surface of a die carrier;
reacting an organosilane precursor to form a layer of photosensitive material onto surfaces of the die and the die carrier;
exposing a first portion of the photosensitive material to UV light while sheltering a second portion of the photosensitive material from the UV light; and
exposing the photosensitive material to halogen-based plasma to remove the second portion of the photosensitive material.
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Accused Products
Abstract
Passivating layers methods for forming the same are provided for packaged integrated circuit devices. In particular, an integrated circuit die is mounted in a plastic leaded chip carrier, and a photosensitive material is then deposited over the surfaces to be passivated. Portions of the photosensitive material are then exposed to UV light, resulting in a crosslinked siloxane network. In this way, a low-temperature photodefinable passivation layer is provided for the package, with characteristics similar to conventional oxides. Advantageously, the photosensitive material can be patterned during the UV exposure, and unexposed portions selectively removed to leave the passivation layer only over desired portions of the package.
216 Citations
18 Claims
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1. A process for forming a passivated integrated circuit device, comprising:
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mounting a die onto a surface of a die carrier;
reacting an organosilane precursor to form a layer of photosensitive material onto surfaces of the die and the die carrier;
exposing a first portion of the photosensitive material to UV light while sheltering a second portion of the photosensitive material from the UV light; and
exposing the photosensitive material to halogen-based plasma to remove the second portion of the photosensitive material. - View Dependent Claims (2, 5, 6, 7, 8, 9, 10, 11)
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3. A method of packaging an integrated circuit die to form a surface mount device, comprising:
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mounting the die onto a surface of a plastic die carrier; and
depositing a photodefinable layer on the die and the die carrier after mounting the die; and
converting the photodefinable layer to a passivation layer, said converting comprising exposing at least a first portion of the photodefinable layer to UV light in an oxygenated environment. - View Dependent Claims (4, 12, 13, 14, 15, 16, 17, 18)
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Specification