Method of manufacturing CCD image sensor by use of recesses
First Claim
1. A method of manufacturing a CCD image sensor comprising the steps of:
- a) forming a plurality of photoelectric conversion devices on a substrate spaced from one another by a predetermined distance;
b) forming a plurality of vertical charge coupled devices between said photoelectric conversion devices;
c) coating a lower planarizing layer on the surface of the exposed substrate, said photoelectric conversion devices and said vertical charge coupled devices;
d) thermally hardening said lower planarizing layer;
e) performing an etching mask operation by coating a photoresist layer onto said thermally-hardened lower planarizing layer;
f) performing an isotropic etching upon the resultant structure subjected to said etching mask operation;
g) forming a plurality of hemispheric recesses by said isotropic etching;
h) removing said photoresist layer after finishing said isotropic etching;
i) forming a dye layer by dyeing said plurality of hemispheric recesses in said lower planarizing layer by means of a plurality of colors;
j) forming an upper planarizing layer on said dye layer; and
k) forming micro-lenses having a proper refractivity on said upper planarizing layer respectively corresponding to said photoelectric conversion devices.
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Accused Products
Abstract
A charge coupled device (CCD) image sensor formed by producing hemispheric recesses in a lower planarizing layer in places corresponding to photodiodes and filling the recesses to form a dye layer. The recesses filled with dye serve as a concave lenses, which has the overall effect of reducing the height of the CCD as measured from the micro-lenses down to the photodiodes. By properly controlling the refractivity of the micro-lenses (to which the light is incident) and that of the dye layer serving as the concave lens, the light incident to the photodiodes advances with respect to the photodiodes, thus reducing a smear phenomenon and improving sensitivity of the CCD.
98 Citations
20 Claims
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1. A method of manufacturing a CCD image sensor comprising the steps of:
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a) forming a plurality of photoelectric conversion devices on a substrate spaced from one another by a predetermined distance; b) forming a plurality of vertical charge coupled devices between said photoelectric conversion devices; c) coating a lower planarizing layer on the surface of the exposed substrate, said photoelectric conversion devices and said vertical charge coupled devices; d) thermally hardening said lower planarizing layer; e) performing an etching mask operation by coating a photoresist layer onto said thermally-hardened lower planarizing layer; f) performing an isotropic etching upon the resultant structure subjected to said etching mask operation; g) forming a plurality of hemispheric recesses by said isotropic etching; h) removing said photoresist layer after finishing said isotropic etching; i) forming a dye layer by dyeing said plurality of hemispheric recesses in said lower planarizing layer by means of a plurality of colors; j) forming an upper planarizing layer on said dye layer; and k) forming micro-lenses having a proper refractivity on said upper planarizing layer respectively corresponding to said photoelectric conversion devices. - View Dependent Claims (2)
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3. A method of manufacturing a CCD image sensor, the method comprising the steps of:
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a) providing a substrate; b) forming a plurality of photoelectric conversion devices on the substrate; c) forming a plurality of charge coupled devices between said photoelectric conversion devices on the substrate; d) forming, after the steps b) and c), a lower planarizing layer on the substrate, said photoelectric conversion devices and said charge coupled devices; e) forming a plurality of recesses in the lower planarizing layer; f) forming a dye layer in said plurality of recesses in said lower planarizing layer; g) forming an upper planarizing layer on said dye layer and said lower planarizing layer; and h) forming micro-lenses on said upper planarizing layer such that the micro-lenses are correspondingly located to said photoelectric conversion devices. - View Dependent Claims (4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification