JP6695188B2 - 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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- JP6695188B2 JP6695188B2 JP2016065869A JP2016065869A JP6695188B2 JP 6695188 B2 JP6695188 B2 JP 6695188B2 JP 2016065869 A JP2016065869 A JP 2016065869A JP 2016065869 A JP2016065869 A JP 2016065869A JP 6695188 B2 JP6695188 B2 JP 6695188B2
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Description
他の実施の形態に係る半導体装置は、半導体基板と、第1半導体素子が形成された第1素子形成領域と、第2半導体素子が形成された第2素子形成領域と、基板コンタクト部とを備えている。第1素子形成領域は、半導体基板の主表面から第1深さに達する第1絶縁分離部によって規定されている。第2素子形成領域は、第1素子形成領域とは距離を隔てて配置され、主表面から第1深さに達する第2絶縁分離部によって規定されている。基板コンタクト部は、第1素子形成領域と第2素子形成領域との間に位置する半導体基板の領域に、主表面側から第1深さよりも深い第2深さに達するように形成され、第1深さから第2深さにわたり半導体基板に接触する。第1絶縁分離部および第2絶縁分離部のそれぞれは、基板コンタクト部とは距離を隔てて配置されている。第1絶縁分離部として、第1素子形成領域を規定する第1絶縁分離第1部と、第1絶縁分離第1部および基板コンタクト部の周囲を取り囲むように配置された第1絶縁分離第2部とを含む、複数の第1絶縁分離部が配置されている。
さらに他の実施の形態に係る半導体装置は、半導体基板と、第1半導体素子が形成された第1素子形成領域と、第2半導体素子が形成された第2素子形成領域と、基板コンタクト部とを備えている。第1素子形成領域は、半導体基板の主表面から第1深さに達する第1絶縁分離部によって規定されている。第2素子形成領域は、第1素子形成領域とは距離を隔てて配置され、主表面から第1深さに達する第2絶縁分離部によって規定されている。基板コンタクト部は、第1素子形成領域と第2素子形成領域との間に位置する半導体基板の領域に、主表面側から第1深さよりも深い第2深さに達するように形成され、第1深さから第2深さにわたり半導体基板に接触する。第1絶縁分離部および第2絶縁分離部のそれぞれは、基板コンタクト部とは距離を隔てて配置されている。基板コンタクト部として、基板コンタクト第1部と、基板コンタクト第1部の周囲を取り囲むように配置された基板コンタクト第2部とを含む、複数の基板コンタクト部が配置されている。
さらに他の実施の形態に係る半導体装置は、半導体基板と、第1半導体素子が形成された第1素子形成領域と、第2半導体素子が形成された第2素子形成領域と、基板コンタクト部とを備えている。第1素子形成領域は、半導体基板の主表面から第1深さに達する第1絶縁分離部によって規定されている。第2素子形成領域は、第1素子形成領域とは距離を隔てて配置され、主表面から第1深さに達する第2絶縁分離部によって規定されている。基板コンタクト部は、第1素子形成領域と第2素子形成領域との間に位置する半導体基板の領域に、主表面側から第1深さよりも深い第2深さに達するように形成され、第1深さから第2深さにわたり半導体基板に接触する。第1絶縁分離部および第2絶縁分離部のそれぞれは、基板コンタクト部とは距離を隔てて配置されている。半導体基板中には、埋め込み不純物領域が形成されている。第1絶縁分離部、第2絶縁分離部および基板コンタクト部は、埋め込み不純物領域を貫通する態様で形成されている。
実施の形態に1係る基板コンタクト部を備えた半導体装置について説明する。
ここでは、基板コンタクト部の平面構造(パターン)のバリエーションについて説明する。
第1例では、図25に示すように、高耐圧NMOSトランジスタ形成領域HVNRを規定する素子分離絶縁膜DTI1の周囲を取り囲むように、基板コンタクト部CLDが配置されている。ここで、高耐圧NMOSトランジスタが、キャリアを放出しやすい半導体素子であると想定する。
第2例では、図26に示すように、CMOSトランジスタ形成領域CMRを規定する素子分離絶縁膜DTI2の周囲を取り囲むように、基板コンタクト部CLDが配置されている。ここで、CMOSトランジスタが、キャリアを受けやすい半導体素子、つまり、キャリアが流れ込みやすい半導体素子であると想定する。
第3例は、第1例と第2例とを合わせた構造とされる。図27に示すように、高耐圧NMOSトランジスタ形成領域HVNRを規定する素子分離絶縁膜DTI1の周囲を取り囲むように、基板コンタクト部CLD1が配置されている。CMOSトランジスタ形成領域CMRを規定する素子分離絶縁膜DTI2の周囲を取り囲むように、基板コンタクト部CLD2が配置されている。
第4例では、図28に示すように、高耐圧NMOSトランジスタ形成領域HVNRを規定する素子分離絶縁膜DTI1の周囲を取り囲むように、基板コンタクト部CLD1が二重に配置されている。ここで、高耐圧NMOSトランジスタが、キャリアを放出しやすい半導体素子であると想定する。
第5例では、図29に示すように、素子形成領域EFRを規定する素子分離絶縁膜DTI1の周囲を取り囲むように、さらに、素子分離絶縁膜DTIが形成されている。これにより、素子形成領域に形成された半導体素子において発生したキャリアが四方を拡散するのを抑制することができる。逆に、四方から拡散してきたキャリアが、素子形成領域EFRに形成された半導体素子へ向かって拡散するのを抑制することができる。これにより、半導体素子の誤動作を確実に抑制することができる。
第6例では、図30に示すように、基板コンタクト部CLDを取り囲むように、さらに、素子分離絶縁膜DTIが形成されている。これにより、素子形成領域に形成された半導体素子において発生したキャリアが四方を拡散するのを確実に抑制することができる。逆に、四方から拡散してきたキャリアが、素子形成領域EFRに形成された半導体素子へ向かって拡散するのを確実に抑制することができる。これにより、半導体素子の誤動作をより確実に抑制することができる。
Claims (10)
- 主表面を有する半導体基板と、
前記主表面から第1深さに達する第1絶縁分離部によって規定された第1素子形成領域と、
前記第1素子形成領域に形成された第1半導体素子と、
前記第1素子形成領域とは距離を隔てて配置され、前記主表面から前記第1深さに達する第2絶縁分離部によって規定された第2素子形成領域と、
前記第2素子形成領域に形成された第2半導体素子と、
前記第1素子形成領域と前記第2素子形成領域との間に位置する前記半導体基板の領域に、前記主表面側から前記第1深さよりも深い第2深さに達するように形成され、前記第1深さから前記第2深さにわたり前記半導体基板に接触する基板コンタクト部と
を備え、
前記第1絶縁分離部および前記第2絶縁分離部のそれぞれは、前記基板コンタクト部とは距離を隔てて配置され、
前記基板コンタクト部は、少なくとも前記第1素子形成領域の周囲を取り囲むように配置された、半導体装置。 - 前記第1絶縁分離部として、
前記第1素子形成領域を規定する第1絶縁分離第1部と、
前記基板コンタクト部の内側に、前記第1絶縁分離第1部の周囲を取り囲むように配置された第1絶縁分離第2部と
を含む、複数の前記第1絶縁分離部が配置された、請求項1記載の半導体装置。 - 主表面を有する半導体基板と、
前記主表面から第1深さに達する第1絶縁分離部によって規定された第1素子形成領域と、
前記第1素子形成領域に形成された第1半導体素子と、
前記第1素子形成領域とは距離を隔てて配置され、前記主表面から前記第1深さに達する第2絶縁分離部によって規定された第2素子形成領域と、
前記第2素子形成領域に形成された第2半導体素子と、
前記第1素子形成領域と前記第2素子形成領域との間に位置する前記半導体基板の領域に、前記主表面側から前記第1深さよりも深い第2深さに達するように形成され、前記第1深さから前記第2深さにわたり前記半導体基板に接触する基板コンタクト部と
を備え、
前記第1絶縁分離部および前記第2絶縁分離部のそれぞれは、前記基板コンタクト部とは距離を隔てて配置され、
前記第1絶縁分離部として、
前記第1素子形成領域を規定する第1絶縁分離第1部と、
前記第1絶縁分離第1部および前記基板コンタクト部の周囲を取り囲むように配置された第1絶縁分離第2部と
を含む、複数の前記第1絶縁分離部が配置された、半導体装置。 - 主表面を有する半導体基板と、
前記主表面から第1深さに達する第1絶縁分離部によって規定された第1素子形成領域と、
前記第1素子形成領域に形成された第1半導体素子と、
前記第1素子形成領域とは距離を隔てて配置され、前記主表面から前記第1深さに達する第2絶縁分離部によって規定された第2素子形成領域と、
前記第2素子形成領域に形成された第2半導体素子と、
前記第1素子形成領域と前記第2素子形成領域との間に位置する前記半導体基板の領域に、前記主表面側から前記第1深さよりも深い第2深さに達するように形成され、前記第1深さから前記第2深さにわたり前記半導体基板に接触する基板コンタクト部と
を備え、
前記第1絶縁分離部および前記第2絶縁分離部のそれぞれは、前記基板コンタクト部とは距離を隔てて配置され、
前記基板コンタクト部として、
基板コンタクト第1部と、
前記基板コンタクト第1部の周囲を取り囲むように配置された基板コンタクト第2部とを含む、複数の前記基板コンタクト部が配置された、半導体装置。 - 主表面を有する半導体基板と、
前記主表面から第1深さに達する第1絶縁分離部によって規定された第1素子形成領域と、
前記第1素子形成領域に形成された第1半導体素子と、
前記第1素子形成領域とは距離を隔てて配置され、前記主表面から前記第1深さに達する第2絶縁分離部によって規定された第2素子形成領域と、
前記第2素子形成領域に形成された第2半導体素子と、
前記第1素子形成領域と前記第2素子形成領域との間に位置する前記半導体基板の領域に、前記主表面側から前記第1深さよりも深い第2深さに達するように形成され、前記第1深さから前記第2深さにわたり前記半導体基板に接触する基板コンタクト部と
を備え、
前記第1絶縁分離部および前記第2絶縁分離部のそれぞれは、前記基板コンタクト部とは距離を隔てて配置され、
前記半導体基板中には、埋め込み不純物領域が形成され、
前記第1絶縁分離部、前記第2絶縁分離部および前記基板コンタクト部は、前記埋め込み不純物領域を貫通する態様で形成された、半導体装置。 - 半導体基板の主表面から第1深さに達する、第1素子形成領域を規定する第1分離溝および第2素子形成領域を規定する第2分離溝を形成するとともに、前記第1分離溝と前記第2分離溝との間に位置する前記半導体基板の前記主表面から前記第1深さに達する開口を形成する工程と、
前記第1素子形成領域に第1半導体素子を形成する工程と、
前記第2素子形成領域に第2半導体素子を形成する工程と、
前記第1分離溝、前記第2分離溝および前記開口を埋め込むように絶縁膜を形成することにより、前記第1分離溝内に第1絶縁分離部を形成するとともに、前記第2分離溝内に第2絶縁分離部を形成する工程と、
前記開口に埋め込まれた前記絶縁膜の部分と前記半導体基板とに順次加工を施すことにより、前記絶縁膜を貫通して前記第1深さよりも深い第2深さに達するコンタクト開口を形成する工程と、
前記コンタクト開口に導電体を形成することにより、前記第1深さから前記第2深さに達する部分において前記導電体が前記半導体基板に接触する基板コンタクト部を形成する工程と
を備えた、半導体装置の製造方法。 - 前記コンタクト開口を形成する工程は、
前記主表面側から前記第1深さに達するまで、前記開口の側壁面を露出させない態様で、前記絶縁膜の部分を除去する第1工程と、
前記第1深さから前記第2深さに達するまで、前記半導体基板の部分を除去する第2工程と
を含み、
前記基板コンタクト部を形成する工程では、前記主表面側から前記第1深さに達するまでは、前記導電体と前記開口の前記側壁面との間に前記絶縁膜の部分が介在する態様で前記導電体が形成される、請求項6記載の半導体装置の製造方法。 - 前記開口および前記コンタクト開口を形成する工程は、前記開口および前記コンタクト開口を、前記第1分離溝および前記第2分離溝の少なくともいずれかの周囲を取り囲むように形成する工程を含み、
前記基板コンタクト部を形成する工程は、前記基板コンタクト部を、前記第1絶縁分離部および前記第2絶縁分離部の少なくともいずれかの周囲を取り囲むように形成する工程を含む、請求項6記載の半導体装置の製造方法。 - 前記開口を形成する工程は、第1開口および第2開口を含む複数の前記開口を形成する工程を有し、
前記コンタクト開口を形成する工程は、前記第1開口にコンタクト開口第1部を形成するとともに、前記第2開口にコンタクト開口第2部を形成する工程を含む複数の前記コンタクト開口を形成する工程を有し、
前記基板コンタクト部を形成する工程は、前記コンタクト開口第1部に基板コンタクト第1部を形成するとともに、前記コンタクト開口第2部に基板コンタクト第2部を形成する工程を含む複数の前記基板コンタクト部を形成する工程を有する、請求項6記載の半導体装置の製造方法。 - 前記第1分離溝を形成する工程は、第1分離溝第1部を形成するとともに、前記第1分離溝第1部を周囲から取り囲むように第1分離溝第2部を形成する工程を含む、複数の前記第1分離溝を形成する工程を有し、
前記第1絶縁分離部を形成する工程は、前記第1分離溝第1部に第1絶縁分離第1部を形成するとともに、前記第1分離溝第2部に第1絶縁分離第2部を形成する工程を有する複数の前記第1絶縁分離部を形成する工程を有する、請求項6記載の半導体装置の製造方法。
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KR102605571B1 (ko) * | 2019-11-28 | 2023-11-23 | 양쯔 메모리 테크놀로지스 씨오., 엘티디. | 로컬 워드 라인 드라이버 디바이스, 메모리 디바이스, 및 그 제조 방법 |
US11502036B2 (en) * | 2020-02-07 | 2022-11-15 | Renesas Electronics Corporation | Semiconductor device and method of manufacturing the same |
US11974430B2 (en) | 2021-01-26 | 2024-04-30 | Micron Technology, Inc. | Microelectronic devices with dopant extensions near a GIDL region below a tier stack, and related methods and systems |
US11948992B2 (en) | 2021-01-26 | 2024-04-02 | Micron Technology, Inc . | Electronic devices comprising a dielectric material, and related systems and methods |
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US7348256B2 (en) * | 2005-07-25 | 2008-03-25 | Atmel Corporation | Methods of forming reduced electric field DMOS using self-aligned trench isolation |
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