Method of making a pillar pattern using triple or quadruple exposure
First Claim
Patent Images
1. A method of making a device, comprising:
- forming a photoresist layer over a substrate;
performing a first exposure of the photoresist layer using a first mask to form first exposed regions in the photoresist layer;
performing a second exposure of the photoresist layer using a second mask to form second exposed regions in the photoresist layer;
performing a third exposure of the photoresist layer using a third mask to form third exposed regions in the photoresist layer, such that each adjacent first, second and third exposed regions are approximately equidistant from each other;
patterning the photoresist layer after the first, the second and the third exposures;
etching the substrate using the patterned photoresist layer;
forming a plurality of pillar shaped devices arranged in a substantially hexagonal pattern, wherein the substantially hexagonal pattern comprises a repeating pattern of seven nonvolatile memory cells having a central nonvolatile memory cell surrounded by six other nonvolatile memory cells arranged in a hexagonal layout around the central nonvolatile memory cell;
forming a plurality of bit lines using double photoresist exposure; and
and forming a plurality of word lines using double photoresist exposure.
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Abstract
Methods of making pillar shaped device array using a triple or quadruple exposure technique are described. A plurality of pillar shaped devices are formed arranged in a hexagonal or rectangular pattern.
32 Citations
14 Claims
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1. A method of making a device, comprising:
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forming a photoresist layer over a substrate; performing a first exposure of the photoresist layer using a first mask to form first exposed regions in the photoresist layer; performing a second exposure of the photoresist layer using a second mask to form second exposed regions in the photoresist layer; performing a third exposure of the photoresist layer using a third mask to form third exposed regions in the photoresist layer, such that each adjacent first, second and third exposed regions are approximately equidistant from each other; patterning the photoresist layer after the first, the second and the third exposures; etching the substrate using the patterned photoresist layer; forming a plurality of pillar shaped devices arranged in a substantially hexagonal pattern, wherein the substantially hexagonal pattern comprises a repeating pattern of seven nonvolatile memory cells having a central nonvolatile memory cell surrounded by six other nonvolatile memory cells arranged in a hexagonal layout around the central nonvolatile memory cell; forming a plurality of bit lines using double photoresist exposure; and and forming a plurality of word lines using double photoresist exposure. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method of making a device, comprising:
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forming at least one semiconductor layer over first conductor lines; forming a first photoresist layer over the at least one semiconductor layer; performing a first exposure of the first photoresist layer using a first mask to form first exposed regions in the first photoresist layer; performing a second exposure of the first photoresist layer using a second mask to form second exposed regions in the first photoresist layer; performing a third exposure of the first photoresist layer using a third mask to form third exposed regions in the first photoresist layer; performing a fourth exposure of the first photoresist layer using a fourth mask to form fourth exposed regions in the first photoresist layer; patterning the first photoresist layer after the first, the second, the third and the fourth exposures; etching the at least one semiconductor layer to form a plurality of pillar shaped devices; and forming a plurality of second conductor lines over the plurality of pillar shaped devices, wherein the first conductor lines comprise word lines, the second conductor lines comprise bit lines, and the pillar shaped devices comprise nonvolatile memory cells arranged in a square or rectangular pattern.
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11. A method of making a device, comprising:
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forming a first photoresist layer over at least one first conductive layer located over a substrate; performing a first exposure of the first photoresist layer using a first mask to form first exposed regions in the first photoresist layer; performing a second exposure of the first photoresist layer using a second mask to form second exposed regions in the first photoresist layer; patterning the first photoresist layer after the first and the second exposures; etching the at least one first conductive layer using the patterned first photoresist layer as a mask to form a plurality of first conductor lines; forming at least one semiconductor layer over the plurality of first conductor lines; forming a second photoresist layer over the at least one semiconductor layer; performing a third exposure of the second photoresist layer using a third mask to form third exposed regions in the second photoresist layer; performing a fourth exposure of the second photoresist layer using a fourth mask to form fourth exposed regions in the second photoresist layer; performing a fifth exposure of the second photoresist layer using a fifth mask to form fifth exposed regions in the second photoresist layer; performing a sixth exposure of the second photoresist layer using a sixth mask to form sixth exposed regions in the second photoresist layer; patterning the second photoresist layer after the third, the fourth, the fifth and the sixth exposures; etching the at least one semiconductor layer to form a plurality of pillar shaped devices; and forming a plurality of second conductor lines over the plurality of pillar shaped devices.
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12. A method of making a device, comprising:
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forming at least one semiconductor layer over first conductor lines formed from at least one first conductive layer; forming a first photoresist layer over the at least one semiconductor layer; performing a first exposure of the first photoresist layer using a first mask to form first exposed regions in the first photoresist layer; performing a second exposure of the first photoresist layer using a second mask to form second exposed regions in the first photoresist layer; performing a third exposure of the first photoresist layer using a third mask to form third exposed regions in the first photoresist layer; performing a fourth exposure of the first photoresist layer using a fourth mask to form fourth exposed regions in the first photoresist layer; patterning the first photoresist layer after the first, the second, the third and the fourth exposures; etching the at least one semiconductor layer to form a plurality of pillar shaped devices; forming at least one second conductive layer over the pillar shaped devices; forming a second photoresist layer over the at least one second conductive layer; performing a fifth exposure of the second photoresist layer using a fifth mask to form fifth exposed regions in the second photoresist layer; performing a sixth exposure of the second photoresist layer using a sixth mask to form sixth exposed regions in the second photoresist layer; patterning the second photoresist layer after the fifth and the sixth exposures; and etching the at least one second conductive layer using the patterned second photoresist layer as a mask to form a plurality of second conductor lines. - View Dependent Claims (13, 14)
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Specification