Method for manufacturing a semiconductor device
First Claim
1. A method for forming a semiconductor device, comprising:
- providing a wafer comprising an upper surface and a plurality of semiconductor mesas extending to the upper surface, adjacent pairs of the semiconductor mesas of the plurality of semiconductor mesas being separated from each other by at least one of a trench extending from the upper surface into the wafer, and a non-semiconductor region arranged on a side-wall of the trench;
forming a first support structure comprising a first material above the upper surface and adjoining the plurality of semiconductor mesas at the upper surface so that the adjacent pairs of the semiconductor mesas are bridged by the first support structure;
forming a second support structure comprising a second material above the upper surface and adjoining the plurality of semiconductor mesas at the upper surface so that the adjacent pairs of the semiconductor mesas are bridged by the second support structure, the second material being different from the first material;
removing the first support structure; and
at least partly removing the second support structure.
1 Assignment
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Accused Products
Abstract
A method for producing a semiconductor device is provided. The method includes: providing a wafer including an upper surface and a plurality of semiconductor mesas extending to the upper surface; forming a first support structure made of a first material and adjoining the plurality of semiconductor mesas at the upper surface so that adjacent pairs of the plurality of semiconductor mesas are bridged by the first support structure; forming a second support structure made of a second material different from the first material and adjoining the plurality of semiconductor mesas at the upper surface so that the adjacent pairs of the plurality of semiconductor mesas are bridged by the second support structure; removing the first support structure; and at least partly removing the second support structure.
18 Citations
27 Claims
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1. A method for forming a semiconductor device, comprising:
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providing a wafer comprising an upper surface and a plurality of semiconductor mesas extending to the upper surface, adjacent pairs of the semiconductor mesas of the plurality of semiconductor mesas being separated from each other by at least one of a trench extending from the upper surface into the wafer, and a non-semiconductor region arranged on a side-wall of the trench; forming a first support structure comprising a first material above the upper surface and adjoining the plurality of semiconductor mesas at the upper surface so that the adjacent pairs of the semiconductor mesas are bridged by the first support structure; forming a second support structure comprising a second material above the upper surface and adjoining the plurality of semiconductor mesas at the upper surface so that the adjacent pairs of the semiconductor mesas are bridged by the second support structure, the second material being different from the first material; removing the first support structure; and at least partly removing the second support structure. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 25, 26)
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18. A method for forming a TEDFET, comprising:
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providing a wafer comprising an upper surface and a semiconductor layer extending to the upper surface; etching wide trenches from the upper surface into the semiconductor layer to form first semiconductor mesas comprising sidewalls; forming sacrificial oxide layers on the sidewalls of the first semiconductor mesas; performing a selective epitaxial growth process to form second semiconductor mesas in the wide trenches between adjacent sacrificial oxide layers; forming on the upper surface a first support structure of a oxidizable material so that adjacent pairs of the first and second semiconductor mesas are bridged by the first support structure; removing the sacrificial oxide layers to expose sidewalls of the first and second semiconductor mesas; forming on the upper surface a second support structure of a non-oxidizable material so that adjacent pairs of the first and second semiconductor mesas are bridged by the second support structure; thermal oxidizing at least the sidewalls of the first and second semiconductor mesas; and at least partly removing the second support structure. - View Dependent Claims (19)
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20. A method for forming a semiconductor device, comprising:
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providing a wafer comprising an upper surface and a plurality of semiconductor mesas which extend to the upper surface and are, next to the upper surface and in a cross-section which is substantially orthogonal to the upper surface, spaced apart from each other; forming a first support structure comprising a first material and adjoining the plurality of semiconductor mesas at the upper surface so that adjacent pairs of the semiconductor mesas are bridged by the first support structure and that the first support structure is substantially arranged only above the upper surface; forming a second support structure comprising a second material and adjoining the plurality of semiconductor mesas at the upper surface so that the adjacent pairs of the semiconductor mesas are bridged by the second support structure and that the second support structure is substantially arranged only above the upper surface, the second material being different from the first material; processing a side wall of at least one of the plurality of semiconductor mesas; removing the first support structure; and at least partly removing the second support structure. - View Dependent Claims (21, 22, 23, 24)
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27. A method for forming a semiconductor device, comprising:
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providing a wafer comprising an upper surface and a plurality of semiconductor mesas extending to the upper surface, adjacent pairs of the semiconductor mesas of the plurality of semiconductor mesas being separated from each other by at least one of a trench extending from the upper surface into the wafer, and a non-semiconductor region arranged on a side-wall of the trench; forming a first support structure comprising a first material and adjoining the plurality of semiconductor mesas at the upper surface so that the adjacent pairs of the semiconductor mesas are bridged by the first support structure; forming a second support structure comprising a second material and adjoining the plurality of semiconductor mesas at the upper surface so that the adjacent pairs of the semiconductor mesas are bridged by the second support structure, the second material being different from the first material; removing the first support structure; at least partly removing the second support structure; and removing the non-semiconductor region after forming the first support structure.
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Specification