Method of manufacturing an image sensor using multiple exposures
First Claim
1. A manufacturing method of a semiconductor device including a solid state image sensor having a plurality of first and second pixels, each second pixel having a first photodiode and a second photodiode, the manufacturing method comprising:
- (a) preparing a substrate including a first region and a second region adjacent to each other along an upper surface of the substrate;
(b) forming a photoresist film over the substrate;
(c) exposing the photoresist film in the first region;
(d) after (c), separately exposing the photoresist film in the second region;
(e) after (c) and (d), patterning the photoresist film by developing the photoresist film;
(f) forming an element isolation structure, which partitions active regions in the first and second pixels in the substrate, over the substrate by using the photoresist film patterned in (e); and
(g) after (f), for each second pixel, forming the first photodiode in the first region and forming the second photodiode in the second region by introducing impurities into the upper surface of the substrate in the respective active region,wherein the first photodiode is on an opposite side of a boundary line between the first region and the second region from the second photodiode in plan view, andthe boundary line is defined by the exposings of (c) and (d).
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Accused Products
Abstract
The performance of a solid state image sensor which is formed by performing divided exposure that exposes the entire chip by a plurality of times of exposure and in which each of a plurality of pixels arranged in a pixel array portion has a plurality of photodiodes is improved.
In the divided exposure performed when the solid state image sensor is manufactured, a dividing line that divides an exposure region is defined to be located between a first photodiode and a second photodiode aligned in a first direction in an active region in a pixel and is defined to be along a second direction perpendicular to the first direction.
13 Citations
14 Claims
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1. A manufacturing method of a semiconductor device including a solid state image sensor having a plurality of first and second pixels, each second pixel having a first photodiode and a second photodiode, the manufacturing method comprising:
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(a) preparing a substrate including a first region and a second region adjacent to each other along an upper surface of the substrate; (b) forming a photoresist film over the substrate; (c) exposing the photoresist film in the first region; (d) after (c), separately exposing the photoresist film in the second region; (e) after (c) and (d), patterning the photoresist film by developing the photoresist film; (f) forming an element isolation structure, which partitions active regions in the first and second pixels in the substrate, over the substrate by using the photoresist film patterned in (e); and (g) after (f), for each second pixel, forming the first photodiode in the first region and forming the second photodiode in the second region by introducing impurities into the upper surface of the substrate in the respective active region, wherein the first photodiode is on an opposite side of a boundary line between the first region and the second region from the second photodiode in plan view, and the boundary line is defined by the exposings of (c) and (d). - View Dependent Claims (2, 3, 4, 5, 6)
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7. A manufacturing method of a semiconductor device including a solid state image sensor having a plurality of first and second pixels, each second pixel having a first photodiode and a second photodiode, the manufacturing method comprising:
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(a) preparing a substrate including a first region and a second region adjacent to each other along an upper surface of the substrate; (b) forming a photoresist film over the substrate; (c) exposing the photoresist film in the first region; (d) after (c), separately exposing the photoresist film in the second region; (e) after (c) and (d), patterning the photoresist film by developing the photoresist film; (f) forming an element isolation structure, which partitions active regions in the first and second pixels in the substrate, over the substrate by using the photoresist film patterned in (e); and (g) after (f), for each second pixel, forming the first photodiode and the second photodiode such that at least portions thereof are aligned along a main surface of the substrate, by introducing impurities into the upper surface of the substrate in the respective active region, wherein a dividing line between the first region and the second region overlaps with the first photodiode and extends in a longitudinal direction of the first photodiode in plan view, and the dividing line is defined by the exposings of (c) and (d). - View Dependent Claims (8)
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9. A manufacturing method comprising:
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forming a photoresist film over a surface of a semiconductor substrate; exposing a first portion of the photoresist film, the first portion being in a first region over the surface of the substrate; after the exposing the first portion, separately exposing a second portion of the photoresist film, the second portion being in a second region over the surface of the substrate, the second region bordering the first region in plan view along a dividing line; after the exposing the first and second portions, patterning the photoresist film by developing the exposed portions of the photoresist film; and using the patterned photoresist film, forming at least one pixel that overlaps the dividing line in plan view, wherein each pixel comprises a first photodiode in the first region and a second photodiode in the second region, and the first and second photodiodes are on opposite sides of the dividing line in plan view. - View Dependent Claims (10, 11, 12, 13, 14)
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Specification