JP6688698B2 - 半導体装置およびその製造方法 - Google Patents
半導体装置およびその製造方法 Download PDFInfo
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- JP6688698B2 JP6688698B2 JP2016135766A JP2016135766A JP6688698B2 JP 6688698 B2 JP6688698 B2 JP 6688698B2 JP 2016135766 A JP2016135766 A JP 2016135766A JP 2016135766 A JP2016135766 A JP 2016135766A JP 6688698 B2 JP6688698 B2 JP 6688698B2
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Description
《半導体装置の構造》
本実施の形態1による半導体装置の構造について図1〜図5を用いて説明する。図1は、本実施の形態1による半導体装置のメモリセル領域を示す平面図である。図2は、本実施の形態1による半導体装置のロジック領域を示す平面図である。図3は、本実施の形態1による半導体装置のメモリセル領域を示す、図1のA−A線およびB−B線に沿った断面図である。図4は、本実施の形態1による半導体装置のロジック領域を示す、図2のC−C線およびD−D線に沿った断面図である。図5は、本実施の形態1による半導体装置のメモリセル領域に形成されたメモリセルの鳥瞰図である。
本実施の形態1による半導体装置の主な特徴は、メモリセル領域1Aの素子分離領域EIの上面を凸形状としている点にある。
本実施の形態1による半導体装置のうち、主に不揮発性メモリの動作について説明する。
本実施の形態1による半導体装置の製造方法について図6〜図57を用いて説明する。図6〜図57は、本実施の形態1による半導体装置の製造工程を説明する断面図である。
本実施の形態1の変形例による半導体装置について、図58および図59を用いて説明する。図58は、本実施の形態1による半導体装置のメモリセル領域を示す、図1のA−A線に沿った拡大断面図である。図59は、本実施の形態1の変形例による半導体装置のメモリセル領域を示す、図1のA−A線に沿った拡大断面図である。
《半導体装置の構造》
本実施の形態2による半導体装置の構造について図60および図61を用いて説明する。図60は、本実施の形態2による半導体装置のメモリセル領域を示す平面図である。図61は、本実施の形態2による半導体装置のメモリセル領域を示す、図60のE−E線およびF−F線に沿った断面図である。
本実施の形態2による半導体装置の主な特徴は、メモリセル領域1Aの素子分離領域EIの上面を凹形状としている点にある。
本実施の形態2による半導体装置(メモリセル領域)の製造方法について図62〜図67を用いて説明する。図62〜図67は、本実施の形態2による半導体装置(メモリセル領域)の製造工程を説明する断面図であり、図60のE−E線に沿った断面図である。
(a)半導体基板の主面上に、第1絶縁膜を形成する工程、
(b)前記第1絶縁膜および前記半導体基板を順次加工して、複数の溝を形成することにより、前記半導体基板の前記主面に沿う第1方向に延在し、前記半導体基板の前記主面に沿って前記第1方向と直交する第2方向に互いに離間する、前記半導体基板の一部分からなる複数の突出部を形成する工程、
(c)熱酸化法を用いて、前記複数の溝の内部の露出した前記半導体基板の表面に第1酸化膜を形成する工程、
(d)CVD法を用いて、前記複数の溝の内部を第2酸化膜で埋め込む工程、
(e)前記第1絶縁膜の上面および前記第2酸化膜の上面を平坦化する工程、
(f)前記第2酸化膜を後退させて、前記第1絶縁膜の側壁を露出させる工程、
(g)前記第1絶縁膜を除去する工程、
(h)ウェットエッチングを用いて、前記第1および第2酸化膜の上面を後退させて、複数の前記突出部の側壁を露出させる工程、
(i)前記第1および第2酸化膜の上面から露出した前記突出部の上部の上面および側壁と第2絶縁膜を介し、前記第2方向に延在する第1ゲート電極を形成する工程、
(j)前記第1および第2酸化膜の上面から露出した前記突出部の上部の上面および側壁並びに前記第1ゲート電極の一方の側壁とトラップ性絶縁膜を含む第3絶縁膜を介し、前記第2方向に延在する第2ゲート電極を形成する工程、
を有し、
前記第2方向に互いに隣り合う前記突出部の間において、前記第2酸化膜の上面が、一方の前記突出部の側壁に接する前記第1酸化膜の上面の位置と他方の前記突出部の側壁に接する前記第1酸化膜の上面の位置とを結んだ第1面よりも低い、半導体装置の製造方法。
付記1記載の半導体装置の製造方法において、
前記第1面の前記第2方向の幅をWとし、前記第1面から前記第2酸化膜の上面の最も低い位置までの距離をDとすると、D/Wは0.4〜0.8である、半導体装置の製造方法。
付記1記載の半導体装置の製造方法において、
前記第1面から前記第2酸化膜の上面の最も低い位置までの距離は、40nm〜60nmである、半導体装置の製造方法。
1B ロジック領域
CG 制御ゲート電極
D1,D2 溝
DF 拡散層
DG ダミーゲート電極
EI 素子分離領域
EX エクステンション領域
FA,FB フィン
G1 ゲート電極
GF、GI ゲート絶縁膜
IF1,IF2,IF3,IF4,IF5 絶縁膜
IL 層間絶縁膜
MC メモリセル
MG メモリゲート電極
N1 窒化シリコン膜
ON ONO膜
PAD 酸化膜
Q1 トランジスタ
RP レジストパターン
SI シリサイド層
SB 半導体基板
SL1 アモルファスシリコン膜
SL2,SL3 ポリシリコン膜
SN1,SN2 窒化シリコン膜
SO1,SO2 酸化シリコン膜
SO3 酸化膜
SW1,SW2,SW3 サイドウォール
UP 下部パターン
X1,X2 酸化シリコン膜
Claims (12)
- 主面を有する半導体基板と、
前記半導体基板の第1領域において、前記半導体基板の一部分であって、前記半導体基板の前記主面に沿う第1方向に延在し、前記半導体基板の前記主面に沿って前記第1方向と直交する第2方向に互いに離間して設けられた複数の第1突出部と、
互いに隣り合う前記第1突出部の間に設けられた第1素子分離領域と、
前記第1素子分離領域の上面から露出する前記第1突出部の上部に、前記第1方向に互いに隣接して設けられた第1トランジスタおよび第2トランジスタと、
を有し、
前記第1トランジスタおよび前記第2トランジスタは、不揮発性メモリセルを構成し、
前記第1トランジスタは、前記第1素子分離領域の上面から露出する前記第1突出部の上部の上面および側壁に形成された第1絶縁膜と、前記第1絶縁膜を介して前記第2方向に延在する第1ゲート電極と、を有し、
前記第2トランジスタは、前記第1素子分離領域の上面から露出する前記第1突出部の上部の上面および側壁に形成された第2絶縁膜と、前記第2絶縁膜を介して前記第2方向に延在する第2ゲート電極と、を有し、
前記第2絶縁膜はトラップ性絶縁膜を含み、前記第2絶縁膜を介して前記第1ゲート電極と前記第2ゲート電極とが配置されており、
前記第2方向に互いに隣り合う前記第1突出部の間において、前記第1素子分離領域の上面の一部が、一方の前記第1突出部の側壁に接する前記第1素子分離領域の上面の位置と他方の前記第1突出部の側壁に接する前記第1素子分離領域の上面の位置とを結んだ第1面よりも高い位置にある、半導体装置。 - 請求項1記載の半導体装置において、
前記第1領域とは異なる、前記半導体基板の第2領域において、前記半導体基板の一部分であって、前記半導体基板の前記主面に沿う第3方向に延在し、前記半導体基板の前記主面に沿って前記第3方向と直交する第4方向に互いに離間して設けられた複数の第2突出部と、
互いに隣り合う前記第2突出部の間に設けられた第2素子分離領域と、
前記第2素子分離領域の上面から露出する前記第2突出部の上部に設けられた第3トランジスタと、
をさらに有し、
前記第4方向に互いに隣り合う前記第2突出部の間において、前記第2素子分離領域の上面の平面度が、前記第1素子分離領域の上面の平面度よりも小さい、半導体装置。 - 請求項1記載の半導体装置において、
前記第1領域とは異なる、前記半導体基板の第2領域において、前記半導体基板の一部分であって、前記半導体基板の前記主面に沿う第5方向に延在し、前記半導体基板の前記主面に沿って前記第5方向と直交する第6方向に互いに離間して設けられた複数の第3突出部と、
互いに隣り合う前記第3突出部の間に設けられた第3素子分離領域と、
前記第3素子分離領域の上面から露出する前記第3突出部の上部に設けられた第4トランジスタと、
をさらに有し、
前記第6方向に互いに隣り合う前記第3突出部の間において、前記第3素子分離領域の上面の一部が、一方の前記第3突出部の側壁に接する前記第3素子分離領域の上面の位置と他方の前記第3突出部の側壁に接する前記第3素子分離領域の上面の位置とを結んだ第2面よりも高い位置にある、半導体装置。 - 請求項1記載の半導体装置において、
前記第1突出部の側壁と前記第2絶縁膜を挟んだ位置にある、前記第2ゲート電極の下部の端部は、前記第1素子分離領域の上面よりも上に位置する、半導体装置。 - 請求項1記載の半導体装置において、
前記第2方向に互いに隣り合う前記第1突出部の間において、前記第1素子分離領域の上面が、前記第2方向に沿った断面において凸形状となっている、半導体装置。 - 請求項1記載の半導体装置において、
前記第1面の前記第2方向の幅をWとし、前記第1面から前記第1素子分離領域の上面の最も高い位置までの距離をHとすると、H/Wは0.2〜0.5である、半導体装置。 - 請求項1記載の半導体装置において、
前記第1面から前記第1素子分離領域の上面の最も高い位置までの距離は、20nm〜30nmである、半導体装置。 - (a)半導体基板の主面上に、第1厚さの第1絶縁膜を形成した後、前記第1絶縁膜上に、前記第1厚さよりも厚い第2厚さの第2絶縁膜を形成する工程、
(b)前記第2絶縁膜、前記第1絶縁膜および前記半導体基板を順次加工して、複数の溝を形成することにより、前記半導体基板の前記主面に沿う第1方向に延在し、前記半導体基板の前記主面に沿って前記第1方向と直交する第2方向に互いに離間する、前記半導体基板の一部分からなる複数の突出部を形成する工程、
(c)前記半導体基板の主面上に第3絶縁膜を堆積して、前記複数の溝の内部を前記第3絶縁膜で埋め込む工程、
(d)前記第3絶縁膜の上面および前記第2絶縁膜の上面を平坦化する工程、
(e)前記第2絶縁膜を除去する工程、
(f)等方性のドライエッチングを行い、前記第1絶縁膜を除去して複数の前記突出部の上面を露出させ、前記第3絶縁膜の上面および側面を後退させて複数の前記突出部の側壁を前記第3絶縁膜の上面から露出させる工程、
(g)前記第3絶縁膜の上面から露出した前記突出部の上面および側壁と第4絶縁膜を介し、前記第2方向に延在する第1ゲート電極を形成する工程、
(h)前記第3絶縁膜の上面から露出した前記突出部の上面および側壁並びに前記第1ゲート電極の一方の側壁とトラップ性絶縁膜を含む第5絶縁膜を介し、前記第2方向に延在する第2ゲート電極を形成する工程、
を有し、
前記第2方向に互いに隣り合う前記突出部の間において、前記第3絶縁膜の上面の一部が、一方の前記突出部の側壁に接する前記第3絶縁膜の上面の位置と他方の前記突出部の側壁に接する前記第3絶縁膜の上面の位置とを結んだ第1面よりも高い、半導体装置の製造方法。 - 請求項8記載の半導体装置の製造方法において、
前記(a)工程において、第1窒化シリコン膜、酸化シリコン膜および第2窒化シリコン膜からなる積層構造の前記第2絶縁膜を形成し、
前記(e)工程において、
(e1)前記第2窒化シリコン膜を除去する工程、
(e2)等方性のドライエッチングを行い、前記酸化シリコン膜を除去し、前記第3絶縁膜の上面および側面を後退させる工程、
(e3)前記第1窒化シリコン膜を除去する工程、
を有する、半導体装置の製造方法。 - 請求項8記載の半導体装置の製造方法において、
前記(e)工程と前記(f)工程との間に、
(i)エッチングを行い、前記第3絶縁膜の上面を後退させる工程、
を有する、半導体装置の製造方法。 - 請求項8記載の半導体装置の製造方法において、
前記第1面の前記第2方向の幅をWとし、前記第1面から前記第3絶縁膜の上面の最も高い位置までの距離をHとすると、H/Wは0.2〜0.5である、半導体装置の製造方法。 - 請求項8記載の半導体装置の製造方法において、
前記第1面から前記第3絶縁膜の上面の最も高い位置までの距離は、20nm〜30nmである、半導体装置の製造方法。
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US9087869B2 (en) * | 2013-05-23 | 2015-07-21 | International Business Machines Corporation | Bulk semiconductor fins with self-aligned shallow trench isolation structures |
KR102030329B1 (ko) * | 2013-05-30 | 2019-11-08 | 삼성전자 주식회사 | 반도체 장치 및 그 제조 방법 |
US9780216B2 (en) | 2014-03-19 | 2017-10-03 | Taiwan Semiconductor Manufacturing Company, Ltd. | Combination FinFET and methods of forming same |
JP2015185613A (ja) * | 2014-03-20 | 2015-10-22 | ルネサスエレクトロニクス株式会社 | 半導体装置およびその製造方法 |
JP6688698B2 (ja) * | 2016-07-08 | 2020-04-28 | ルネサスエレクトロニクス株式会社 | 半導体装置およびその製造方法 |
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EP3267471A2 (en) | 2018-01-10 |
US20180012901A1 (en) | 2018-01-11 |
US9985043B2 (en) | 2018-05-29 |
US10483275B2 (en) | 2019-11-19 |
TWI726125B (zh) | 2021-05-01 |
JP2018006694A (ja) | 2018-01-11 |
CN107591449B (zh) | 2022-05-10 |
TW201826399A (zh) | 2018-07-16 |
US10211216B2 (en) | 2019-02-19 |
US20180247952A1 (en) | 2018-08-30 |
US20190148394A1 (en) | 2019-05-16 |
EP3267471A3 (en) | 2018-04-04 |
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