JP7200054B2 - 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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- JP7200054B2 JP7200054B2 JP2019116338A JP2019116338A JP7200054B2 JP 7200054 B2 JP7200054 B2 JP 7200054B2 JP 2019116338 A JP2019116338 A JP 2019116338A JP 2019116338 A JP2019116338 A JP 2019116338A JP 7200054 B2 JP7200054 B2 JP 7200054B2
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Description
以下に、本実施の形態における不揮発性メモリを有する半導体チップの構成について説明する。本実施の形態における半導体チップ(図示しない)は、CPU(Central Processing Unit)、RAM(Random Access Memory)およびアナログ回路を有している。さらに、本実施の形態における半導体チップは、EEPROM(Electrically Erasable Programmable Read Only Memory)を有している。また、当該半導体チップは、フラッシュメモリおよびI/O(Input/Output)回路を有している。
以下に、図1~図5を用いて、本実施の形態の半導体装置の構造について説明する。図1は、本実施の形態における半導体装置の平面図である。図2は、本実施の形態における半導体装置の斜視図である。図3~図5は、本実施の形態における半導体装置の断面図である。図1では、フィン、素子分離膜、エピタキシャル層、ゲート電極、プラグおよび配線のみを示している。図2では、ウェル、素子分離膜および各素子の上の層間絶縁膜などの絶縁膜および配線の図示を省略している。図3では、素子分離膜および各素子の上の層間絶縁膜などの絶縁膜、プラグおよび配線の図示を省略している。また、図4および図5では、第1配線層を構成する層間絶縁膜および第1配線上の他の配線層の図示を省略している。なお、本願の断面図では、図を分かり易くするため、メモリセル領域の制御ゲート電極およびメモリゲート電極をロジック回路領域(nMIS領域およびpMIS領域)のゲート電極より小さい幅で示している。しかし、実際にはロジック回路領域(nMIS領域およびpMIS領域)のゲート電極の方が、制御ゲート電極およびメモリゲート電極に比べ、ゲート長方向における幅が小さい。
次に、不揮発性メモリの動作例について、図33を参照して説明する。
FINFETでは、フィンの短手方向の幅が小さいため、フィン内にのみソース・ドレイン領域を形成すると、ソース・ドレイン領域に接続するプラグとフィンとの接触面積が小さくなる。したがって、プラグとソース・ドレイン領域との間の接続抵抗が大きくなる問題がある。そこで、図35に示す比較例では、フィンFAの上面を覆い、当該短手方向においてフィンFAよりも大きい幅を有するエピタキシャル層EP、EP4を形成している。ここでは、エピタキシャル層EP内にドレイン領域を構成する拡散領域DDを形成し、エピタキシャル層EP4内にソース領域を構成する拡散領域SDを形成している。図35は、比較例である半導体装置を示す断面図である。図35では左から順に、ゲート電極およびソース・ドレイン領域を含みフィンの長手方向に沿う断面、ドレイン領域を含みフィンの短手方向に沿う断面、および、ソース領域を含みフィンの短手方向に沿う断面を示している。また、図35では図4と異なり、積層構造を有するサイドウォールスペーサSWを、図を分かり易くするため1つの膜として示している。
以下に、図6~図32を用いて、本実施の形態の半導体装置の製造方法について説明する。図6~図32は、本実施の形態の半導体装置の製造工程中の断面図である。図6、図7および図22は、Y方向に沿う断面図である。図22は、図5と同じ複数の領域を示す断面図である。
図35を用いて上述したように、FINFETから成るメモリセルでは、ソース・ドレイン領域のそれぞれをエピタキシャル層内に形成する場合がある。しかし、図35に示すエピタキシャル層EP4の上端がメモリゲート電極MGの底面より上の位置に達することで、メモリゲート電極MGとソース領域との間の耐圧が低下する虞がある。
図34に、本実施の形態の変形例である半導体装置の平面図を示す。図34に示す平面図は、メモリセル領域のメモリセルアレイの端部を示す平面レイアウトである。ここでは、上述した実施の形態と同様に、メモリセルのドレイン領域はエピタキシャル層内に形成され、メモリセルのソース領域はフィン内にのみ形成されており、ソース領域上にエピタキシャル層は形成されていない。図34では、エピタキシャル層の図示を省略している。図34では、エピタキシャル層を形成する領域を一点鎖線で囲み、エピタキシャル層を形成しない領域を破線で囲んでいる。
1B nMIS領域
1C pMIS領域
C1 絶縁膜(ONO膜)
CG 制御ゲート電極
D1、D2、DD、SD 拡散領域
EI 素子分離膜
FA~FC フィン
EP、EP1~EP4 エピタキシャル層
G1、G2 ゲート電極
MC、MCA メモリセル
MF1~MF4 金属膜
MG メモリゲート電極
PG プラグ
QN n型トランジスタ
QP p型トランジスタ
S1、S2 シリサイド層
SB 半導体基板
Claims (13)
- 第1領域を有する半導体基板と、
前記第1領域の前記半導体基板の一部分であって、前記半導体基板の上面に形成された第1溝の底面から上方に突出し、前記半導体基板の前記上面に沿う第1方向に延在する第1突出部と、
前記第1突出部の上面上および側面上に第1絶縁膜を介して形成され、前記第1方向と平面視で交差する第2方向に延在する第1ゲート電極と、
前記第1突出部の前記上面上および前記側面上に電荷蓄積部を含む第2絶縁膜を介して形成され、前記第1ゲート電極の一方の側面に第3絶縁膜を介して隣接し、前記第2方向に延在する第2ゲート電極と、
前記第1ゲート電極および前記第2ゲート電極と平面視で隣り合う前記第1突出部のうち、前記第1ゲート電極側の前記第1突出部の前記上面に接して形成された第1半導体層と、
前記第1半導体層内に形成された第1導電型の第1半導体領域と、
前記第1ゲート電極および前記第2ゲート電極と平面視で隣り合う前記第1突出部のうち、前記第2ゲート電極側の前記第1突出部内に形成された前記第1導電型の第2半導体領域と、
前記第2半導体領域の上面に接するシリサイド層と、
を有し、
前記第2方向において、前記第1半導体層の幅は、前記第1突出部の幅よりも大きく、
前記第1ゲート電極、前記第2ゲート電極、前記第2絶縁膜、前記第1半導体領域および前記第2半導体領域は、不揮発性記憶素子を構成している、半導体装置。 - 請求項1記載の半導体装置において、
前記不揮発性記憶素子上に形成された第1導電性接続部および第2導電性接続部をさらに有し、
前記第1導電性接続部は、前記第1半導体層の上面に接し、
前記第2導電性接続部は、前記シリサイド層の上面に接している、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半導体層の上面の位置は、前記第2ゲート電極の下面の位置よりも高く、
前記シリサイド層の上面の位置は、前記第2ゲート電極の前記下面の位置よりも低い、半導体装置。 - 請求項1記載の半導体装置において、
前記第2方向において、前記第1半導体領域の幅は、前記第2半導体領域の幅よりも大きい、半導体装置。 - 請求項1記載の半導体装置において、
前記半導体基板の前記第1領域とは異なる第2領域の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上面に形成された第2溝の底面から上方に突出し、前記半導体基板の前記上面に沿う第3方向に延在する第2突出部と、
前記第2突出部の上面上に第4絶縁膜を介して形成され、前記第3方向と平面視で交差する第4方向に延在する第3ゲート電極と、
前記第3ゲート電極と平面視で隣り合う前記第2突出部のそれぞれの上に、前記第2突出部の前記上面に接して形成された一対の第2半導体層と、
前記一対の第2半導体層のうち、一方の内部に形成されたドレイン領域、および、他方の内部に形成されたソース領域と、
を有し、
前記第4方向において、前記一対の第2半導体層のそれぞれの幅は、前記第2突出部の幅よりも大きく、
前記第3ゲート電極は、金属膜から成り、
前記第3ゲート電極、前記ドレイン領域および前記ソース領域は、電界効果トランジスタを構成している、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突出部は、前記第1領域において前記第2方向に複数並んで配置され、
複数の前記第1突出部のうち、前記第2方向における端部の前記第1突出部の前記上面、または、前記第1方向における前記第1突出部の端部であって、前記第1ゲート電極と隣り合う前記第1突出部の前記端部の前記上面は、前記第1半導体層から露出している、半導体装置。 - (a)第1領域を有する半導体基板を準備する工程、
(b)前記第1領域の前記半導体基板の上面に第1溝を形成することで、前記第1領域の前記半導体基板の一部から成り、前記第1溝の底面から上方に突出し、前記半導体基板の前記上面に沿う第1方向に延在する第1突出部を形成する工程、
(c)前記第1突出部の周囲を埋め込む素子分離膜を形成する工程、
(d)前記第1方向と平面視で交差する第2方向に延在する第1ゲート電極を、前記第1突出部の上面上および側面上に第1絶縁膜を介して形成し、前記第1ゲート電極の一方の側面に第3絶縁膜を介して隣接し、前記第2方向に延在する第2ゲート電極を、前記第1突出部の前記上面上および前記側面上に、電荷蓄積部を含む第2絶縁膜を介して形成する工程、
(d1)前記(d)工程の後、平面視において前記第1ゲート電極および前記第2ゲート電極と隣り合う前記第1突出部の前記上面のうち、前記第1ゲート電極側の前記第1突出部の前記上面を後退させることで第3溝を形成する工程をさらに有し、
(e)前記(d1)工程の後、平面視において前記第1ゲート電極および前記第2ゲート電極と隣り合う前記第1突出部の前記上面のうち、前記第1ゲート電極側の前記第1突出部の前記上面上に第1エピタキシャル層を形成する工程、
(f)前記第1エピタキシャル層内に第1導電型の第1半導体領域を形成し、平面視において前記第1ゲート電極および前記第2ゲート電極と隣り合う前記第1突出部のうち、前記第2ゲート電極側の前記第1突出部内に前記第1導電型の第2半導体領域を形成する工程、
(g)前記(f)工程の後、前記第1ゲート電極の上面上および前記第2ゲート電極の上面上に第1シリサイド層を形成し、平面視において前記第1ゲート電極および前記第2ゲート電極と隣り合う前記第1突出部のうち、前記第2ゲート電極側の前記第1突出部の前記上面上に、前記第2半導体領域に電気的に接続された第2シリサイド層を形成する工程、
を有し、
前記第1ゲート電極、前記第2ゲート電極、前記第2絶縁膜、前記第1半導体領域および前記第2半導体領域は、不揮発性記憶素子を構成し、
前記(e)工程では、前記第3溝上に前記第1エピタキシャル層を形成する、半導体装置の製造方法。 - 請求項7記載の半導体装置の製造方法において、
前記半導体基板は、第2領域をさらに有し、
前記(b)工程では、前記第2領域の前記半導体基板の前記上面に第2溝を形成することで、前記第2領域の前記半導体基板の一部から成り、前記半導体基板の前記第2溝の底面から上方に突出し、前記半導体基板の前記上面に沿う第3方向に延在する第2突出部を形成し、
前記(c)工程では、前記第2突出部の周囲を埋め込む前記素子分離膜を形成し、
前記(d)工程では、前記第3方向と平面視で交差する第4方向に延在する第3ゲート電極を、前記第2突出部の上面上および側面上に第4絶縁膜を介して形成し、
前記(e)工程では、平面視において前記第3ゲート電極と隣り合う前記第2突出部の前記上面上に一対の第2エピタキシャル層を形成し、
前記(f)工程では、前記一対の第2エピタキシャル層のうち、一方の内部に前記第1導電型のソース領域を形成し、他方の内部に前記第1導電型のドレイン領域を形成し、
(f1)前記(f)工程の後、前記第3ゲート電極を除去し、前記一対の第2エピタキシャル層の相互間の前記第2突出部の前記上面上および前記側面上に、前記第4方向に延在し、第1金属膜から成る第4ゲート電極を形成する工程をさらに有し、
前記第4ゲート電極、前記ソース領域および前記ドレイン領域は、電界効果トランジスタを構成している、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(f1)工程は、前記(g)工程の前に行う、半導体装置の製造方法。 - 請求項9記載の半導体装置の製造方法において、
前記(f1)工程は、
(f2)前記第3ゲート電極を除去する工程、
(f3)前記(f2)工程の後、前記一対の第2エピタキシャル層の相互間の前記第2突出部の前記上面上および前記側面上に第1膜を形成する工程、
(f4)前記(f3)工程の後、前記半導体基板に対し第1温度で熱処理を行う工程、
(f5)前記(f4)工程の後、前記第2突出部の前記上面上および前記側面上に前記第1膜を介して前記第4ゲート電極を形成する工程、
を有し、
前記(g)工程は、
(g1)前記第1ゲート電極の前記上面および前記第2ゲート電極の前記上面をそれぞれ覆う第2金属膜を形成する工程、
(g2)前記(g1)工程の後、前記半導体基板に対し、前記第1温度より低い第2温度で熱処理を行うことで、前記第1シリサイド層および前記第2シリサイド層を形成する工程、
(g3)前記(g2)工程の後、前記半導体基板に対し、前記第1温度より低い第3温度で熱処理を行う工程、
を有する、半導体装置の製造方法。 - 請求項7記載の半導体装置の製造方法において、
(h)前記(g)工程の後、前記第1エピタキシャル層の上面に接する第1導電性接続部と、前記第2シリサイド層の上面に接する第2導電性接続部とを形成する工程をさらに有する、半導体装置の製造方法。 - 請求項7記載の半導体装置の製造方法において、
(f6)前記(f)工程の後、前記(g)工程の前に、前記第1エピタキシャル層を覆い、平面視において前記第1ゲート電極および前記第2ゲート電極と隣り合う前記第1突出部のうち、前記第2ゲート電極側の前記第1突出部の前記上面を露出する層間絶縁膜を形成する工程をさらに有し、
前記(g)工程では、前記層間絶縁膜が前記第1エピタキシャル層を覆った状態で前記第1シリサイド層および前記第2シリサイド層を形成する、半導体装置の製造方法。 - 請求項7記載の半導体装置の製造方法において、
前記(b)工程では、前記第1領域において、前記第1突出部を前記第2方向に複数並べて形成し、
前記(e)工程では、複数の前記第1突出部のうち、前記第2方向における端部の前記第1突出部の前記上面、または、前記第1方向における前記第1突出部の端部であって、前記第1ゲート電極と隣り合う前記第1突出部の前記端部の前記上面を保護膜により覆った状態で、前記第1エピタキシャル層を形成する、半導体装置の製造方法。
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