JP2021524997A - 導電ビア製造のためのエッチングストップ層ベースのアプローチおよびその結果として得られる構造 - Google Patents
導電ビア製造のためのエッチングストップ層ベースのアプローチおよびその結果として得られる構造 Download PDFInfo
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- JP2021524997A JP2021524997A JP2020535199A JP2020535199A JP2021524997A JP 2021524997 A JP2021524997 A JP 2021524997A JP 2020535199 A JP2020535199 A JP 2020535199A JP 2020535199 A JP2020535199 A JP 2020535199A JP 2021524997 A JP2021524997 A JP 2021524997A
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- H01L21/76838—Applying interconnections to be used for carrying current between separate components within a device comprising conductors and dielectrics characterised by the formation and the after-treatment of the conductors
- H01L21/76877—Filling of holes, grooves or trenches, e.g. vias, with conductive material
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Abstract
Description
Claims (25)
- 集積回路構造であって、
基板の上方の層間誘電(ILD)層における複数の導電線であって、各々が、金属を含むバルク部分、および、前記金属および非金属を含む最上面を有する、複数の導電線と、
前記複数の導電線上、且つ、前記ILD層の最上面上におけるハードマスク層であって、前記複数の導電線の前記最上面上にあって且つ前記最上面と整合された第1ハードマスクコンポーネント、および、前記ILD層の前記最上面の複数の領域上にあって且つ前記複数の領域と整合された第2ハードマスクコンポーネントを有し、前記第1ハードマスクコンポーネントおよび前記第2ハードマスクコンポーネントは組成が互いに異なる、ハードマスク層と、
前記ハードマスク層にある開口内、且つ、前記複数の導電線のうちの1つの一部分上にある導電ビアであって、前記一部分は、前記金属および前記非金属を含む前記最上面とは異なる組成を有する、導電ビアと
を備える、集積回路構造。 - 前記非金属は、酸素、ケイ素、ゲルマニウムおよびホウ素から成る群から選択される、
請求項1に記載の集積回路構造。 - 前記金属は、コバルト、銅、タングステンおよびニッケルから成る群から選択される、
請求項1または2に記載の集積回路構造。 - 前記第1ハードマスクコンポーネントは、ALOx、HfOx、ZrOxおよびTiOxから成る群から選択される金属酸化物である、
請求項1から3の何れか一項に記載の集積回路構造。 - 前記複数の導電線のうちの前記1つの前記一部分は、前記金属および前記非金属を含む前記最上面と実質的に同一平面である、
請求項1から4の何れか一項に記載の集積回路構造。 - 前記複数の導電線のうちの前記1つの前記一部分は、前記金属および前記非金属を含む前記最上面の下方に凹設される、
請求項1から4の何れか一項に記載の集積回路構造。 - 前記第1ハードマスクコンポーネントは、前記複数の導電線の前記最上面に限られる、
請求項1から6の何れか一項に記載の集積回路構造。 - 前記第1ハードマスクコンポーネントは、前記ILD層の前記最上面の上へ延在する、
請求項1から6の何れか一項に記載の集積回路構造。 - 前記導電ビアの一部分は、前記ハードマスク層の前記第2ハードマスクコンポーネントの一部分上にある、
請求項1から8の何れか一項に記載の集積回路構造。 - 前記第1ハードマスクコンポーネントは、前記第2ハードマスクコンポーネントの最上面と実質的に同一平面にある最上面を有する、
請求項1から9の何れか一項に記載の集積回路構造。 - 前記ハードマスク層の上方にある第2ILD層を更に備え、
前記導電ビアは更に、前記第2ILD層の開口内にある、
請求項1から10の何れか一項に記載の集積回路構造。 - 前記複数の導電線のうちの1つは、下層導電ビア構造に結合され、前記下層導電ビア構造は、前記集積回路構造の下層メタライゼーション層に接続される、
請求項1から11の何れか一項に記載の集積回路構造。 - 集積回路構造であって、
基板の上方の層間誘電(ILD)層における複数の導電線と、
前記複数の導電線上、且つ、前記ILD層の最上面上におけるハードマスク層であって、前記複数の導電線の前記最上面上にあって且つ前記最上面と整合された第1ハードマスクコンポーネント、および、前記ILD層の前記最上面の複数の領域上にあって且つ前記複数の領域と整合された第2ハードマスクコンポーネントを有し、前記第1ハードマスクコンポーネントおよび前記第2ハードマスクコンポーネントは組成が互いに異なり、前記第1ハードマスクコンポーネントは、下部エッチングストップ層と、前記下部エッチングストップ層とは異なる上部層とを含む、ハードマスク層と、
前記ハードマスク層にある開口内、且つ、前記複数の導電線のうちの1つの一部分上にある導電ビアと
を備える、集積回路構造。 - 前記下部エッチングストップ層は、SiOxおよびSiNxから成る群から選択され、前記第1ハードマスクコンポーネントの前記上部層は、ALOx、HfOx、ZrOxおよびTiOxから成る群から選択される金属酸化物である、
請求項13に記載の集積回路構造。 - 前記第1ハードマスクコンポーネントは、前記複数の導電線の前記最上面に限られる、
請求項13または14に記載の集積回路構造。 - 前記第1ハードマスクコンポーネントは、前記ILD層の前記最上面の上へ延在する、
請求項13または14に記載の集積回路構造。 - 前記導電ビアの一部分は、前記ハードマスク層の前記第2ハードマスクコンポーネントの一部分上にある、
請求項13から16の何れか一項に記載の集積回路構造。 - 前記第1ハードマスクコンポーネントは、前記第2ハードマスクコンポーネントの最上面と実質的に同一平面にある最上面を有する、
請求項13から17の何れか一項に記載の集積回路構造。 - 前記ハードマスク層の上方にある第2ILD層を更に備え、
前記導電ビアは更に、前記第2ILD層の開口内にある、
請求項13から18の何れか一項に記載の集積回路構造。 - 前記複数の導電線のうちの1つは、下層導電ビア構造に結合され、前記下層導電ビア構造は、前記集積回路構造の下層メタライゼーション層に接続される、
請求項13から19の何れか一項に記載の集積回路構造。 - 集積回路構造を製造する方法であって、
基板の上方の層間誘電(ILD)層に複数の導電線を形成する段階であって、前記複数の導電線の各々が、金属を含むバルク部分を有する、段階と、
前記複数の導電線を処理して、前記金属および非金属を含む最上面を形成する段階と、
前記複数の導電線上、且つ、前記ILD層の最上面上にハードマスク層を形成する段階であって、前記ハードマスク層は、前記複数の導電線の前記最上面上にあって且つ前記最上面と整合された第1ハードマスクコンポーネント、および、前記ILD層の前記最上面の複数の領域上にあって且つ前記複数の領域と整合された第2ハードマスクコンポーネントを有し、前記第1ハードマスクコンポーネントおよび前記第2ハードマスクコンポーネントは組成が互いに異なる、段階と、
前記複数の導電線のうちの1つの一部分を露出させて前記ハードマスク層に開口を形成する段階と、
前記複数の導電線のうちの前記1つの露出部分を改質して、前記複数の導電線のうちの前記1つの前記露出部分の前記最上面から前記非金属を除去する段階と、
前記ハードマスク層における前記開口内、且つ、前記複数の導電線のうちの前記1つの改質された前記露出部分上に導電ビアを形成する段階と
を備える、方法。 - 前記複数の導電線のうちの前記1つの前記露出部分を改質する段階は、前記最上面の前記金属を保持する段階を有する、
請求項21に記載の方法。 - 前記複数の導電線のうちの前記1つの前記露出部分を改質する段階は、前記最上面の前記金属を除去して前記複数の導電線のうちの前記1つの凹設部分を形成する段階を有する、
請求項21に記載の方法。 - 前記複数の導電線を処理する段階は、アンモニアと、酸素、ケイ素、ゲルマニウムおよびホウ素から成る群から選択される非金属のソースとに前記複数の導電線を露出させる段階を含む、
請求項21から23の何れか一項に記載の方法。 - 前記ハードマスク層を形成する段階は、自己組織化(DSA)アプローチまたは選択的成長アプローチを使用する段階を有する、
請求項21から24の何れか一項に記載の方法。
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