JP6235325B2 - 電界効果トランジスタ及びその製造方法、半導体デバイス及びその製造方法 - Google Patents
電界効果トランジスタ及びその製造方法、半導体デバイス及びその製造方法 Download PDFInfo
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- JP6235325B2 JP6235325B2 JP2013255383A JP2013255383A JP6235325B2 JP 6235325 B2 JP6235325 B2 JP 6235325B2 JP 2013255383 A JP2013255383 A JP 2013255383A JP 2013255383 A JP2013255383 A JP 2013255383A JP 6235325 B2 JP6235325 B2 JP 6235325B2
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- 229910052738 indium Inorganic materials 0.000 description 1
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- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 description 1
- 229910052721 tungsten Inorganic materials 0.000 description 1
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- H01L27/04—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components specially adapted for rectifying, oscillating, amplifying or switching and having potential barriers; including integrated passive circuit elements having potential barriers the substrate being a semiconductor body
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- H01L27/085—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components specially adapted for rectifying, oscillating, amplifying or switching and having potential barriers; including integrated passive circuit elements having potential barriers the substrate being a semiconductor body including only semiconductor components of a single kind including field-effect components only
- H01L27/088—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components specially adapted for rectifying, oscillating, amplifying or switching and having potential barriers; including integrated passive circuit elements having potential barriers the substrate being a semiconductor body including only semiconductor components of a single kind including field-effect components only the components being field-effect transistors with insulated gate
- H01L27/092—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components specially adapted for rectifying, oscillating, amplifying or switching and having potential barriers; including integrated passive circuit elements having potential barriers the substrate being a semiconductor body including only semiconductor components of a single kind including field-effect components only the components being field-effect transistors with insulated gate complementary MIS field-effect transistors
- H01L27/0924—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components specially adapted for rectifying, oscillating, amplifying or switching and having potential barriers; including integrated passive circuit elements having potential barriers the substrate being a semiconductor body including only semiconductor components of a single kind including field-effect components only the components being field-effect transistors with insulated gate complementary MIS field-effect transistors including transistors with a horizontal current flow in a vertical sidewall of a semiconductor body, e.g. FinFET, MuGFET
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- H01L29/66409—Unipolar field-effect transistors
- H01L29/66477—Unipolar field-effect transistors with an insulated gate, i.e. MISFET
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- H01L29/772—Field effect transistors
- H01L29/78—Field effect transistors with field effect produced by an insulated gate
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- H01L29/66—Types of semiconductor device ; Multistep manufacturing processes therefor
- H01L29/68—Types of semiconductor device ; Multistep manufacturing processes therefor controllable by only the electric current supplied, or only the electric potential applied, to an electrode which does not carry the current to be rectified, amplified or switched
- H01L29/76—Unipolar devices, e.g. field effect transistors
- H01L29/772—Field effect transistors
- H01L29/78—Field effect transistors with field effect produced by an insulated gate
- H01L29/785—Field effect transistors with field effect produced by an insulated gate having a channel with a horizontal current flow in a vertical sidewall of a semiconductor body, e.g. FinFET, MuGFET
- H01L2029/7857—Field effect transistors with field effect produced by an insulated gate having a channel with a horizontal current flow in a vertical sidewall of a semiconductor body, e.g. FinFET, MuGFET of the accumulation type
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Description
以下に、本発明の各実施の形態について図面を参照しながら説明する。なお、実施の形態を通して共通の構成には同一の符号を付すものとし、重複する説明は省略する。また、各図は発明の説明とその理解を促すための模式図であり、その形状や寸法、比などは実際の装置と異なる個所があるが、これらは以下の説明と公知の技術を参酌して適宜、設計変更することができる。
図1乃至図3を参照して、本発明の実施形態に係る電界効果トランジスタの構造について説明する。
本実施形態のジャンクションレスFET1において、ソース/ドレイン領域101の導電型は、チャネル領域100の導電型と同じである。すなわち、本実施形態のジャンクションレスFET(ジャンクションレスFinFET)1が、p型MISFETである場合、チャネル領域100及びソース/ドレイン領域101は、p型の半導体領域(例えば、p型の多結晶Ge層)であり、本実施形態のジャンクションレスFET1が、n型MISFETである場合、チャネル領域100及びソース/ドレイン領域101は、n型の半導体領域(例えば、n型の多結晶Ge層)である。
図4に示されるFETは、プレーナー構造のジャンクションレスFETである。
図4に示されように、プレーナー構造のジャンクションレス型FETのゲート絶縁膜21とチャネル領域(例えば、多結晶ゲルマニウム層)10との間に、キャップ層30が用いられてもよい。また、実施形態の電界効果トランジスタ1は、ダブルゲート構造の電界効果トランジスタでもよい。尚、プレーナー構造のジャンクションレス型FETにおいて、例えば、絶縁膜81上の多結晶ゲルマニウム層10は、絶縁膜82によって区画されている。
この結果として、本実施形態のジャンクションレスFETは、ノーマリーオフ動作を実現できる。
図5乃至図9を参照して、本発明の実施形態の半導体デバイス(電界効果トランジスタ)の製造方法について説明する。
このように、多結晶Ge層10が、半導体基板80上方に、形成される。
図10乃至図15を参照して、実施形態の半導体デバイス(電界効果トランジスタ)の作用及び効果について、説明する。
図12の(a)及び(b)において、n型及びp型ジャンクションレスFETのそれぞれに対してゲート絶縁膜(HfAlO膜)とチャネル領域(多結晶Ge領域)との間にキャップ層(Si層)を介在させることで、p型及びn型のジャンクションレスFETは、ノーマリーオフ動作になる。
図15の(a)は、ゲート絶縁膜、キャップ層(Si)及びチャネル領域(Ge)の定常状態におけるバンドギャップ構造を示している。図15の(b)は、プレーナー構造のn型FETにおけるゲート絶縁膜、キャップ層(Si)及びチャネル領域(Ge)のバンド構造を示し、図15の(c)は、プレーナー構造のp型FETにおけるゲート絶縁膜、キャップ層(Si)及びチャネル領域(Ge)のバンドギャップ構造を示している。図15の(d)は、マルチゲート構造のFETのゲート絶縁膜、キャップ層(Si)及びチャネル領域(Ge)のバンドギャップ構造を示している。
図16を参照して、実施形態の電界効果トランジスタ(ジャンクションレスFET)の適用例について説明する。
本実施形態の電界効果トランジスタ及びその製造方法は、以下の構成を含む。
Claims (11)
- 半導体領域内に設けられたソース領域及びドレイン領域と、
前記半導体領域内において前記ソース領域と前記ドレイン領域との間に設けられ、前記ソース領域及び前記ドレイン領域と同じ導電型のチャネル領域と、
前記チャネル領域上に設けられ、前記チャネル領域と異なる材料を含む半導体層と、
前記半導体層上に設けられたゲート絶縁膜と、
前記ゲート絶縁膜上に設けられたゲート電極と、
を具備し、
前記半導体領域は、ゲルマニウムを主成分としている、
電界効果トランジスタ。 - 前記半導体領域は、多結晶半導体領域である、
請求項1に記載の電界効果トランジスタ。 - 前記半導体層は、シリコンを主成分としている、
請求項1又は2に記載の電界効果トランジスタ。 - 請求項1乃至3のいずれか1項に記載された電界効果トランジスタを複数個含み、
前記複数の電界効果トランジスタのうち少なくとも1つの第1の電界効果トランジスタは、第1の導電型を有し、
前記複数の電界効果トランジスタのうち少なくとも1つの第2の電界効果トランジスタは、前記第1の導電型と異なる第2の導電型を有し、
前記第1の電界効果トランジスタの前記ゲート電極の材料は、前記第2の電界効果トランジスタの前記ゲート電極の材料と同じである、
半導体デバイス。 - 基板上に、第1の導電型のソース領域、前記第1の導電型のドレイン領域、及び、前記ソース領域及び前記ドレイン領域間の前記第1の導電型のチャネル領域を含み、ゲルマニウムを主成分としている半導体領域を、形成する工程と、
前記チャネル領域上に、前記チャネル領域と異なる材料を含む半導体層を形成する工程と、
前記半導体層上のゲート絶縁膜上に、ゲート電極を形成する工程と、
を具備する電界効果トランジスタの製造方法。 - 前記半導体領域は、多結晶半導体領域である、
請求項5に記載の電界効果トランジスタの製造方法。 - 前記半導体層は、シリコンを主成分としている、
請求項5又は6に記載の電界効果トランジスタの製造方法。 - 基板上に、第1の導電型の第1のソース領域、前記第1の導電型の第1のドレイン領域、及び、前記第1のソース領域及び前記第1のドレイン領域間の前記第1の導電型の第1のチャネル領域を含む第1の半導体領域を形成する工程と、
前記基板上に、前記第1の導電型と異なる第2の導電型の第2のソース領域、前記第2の導電型の第2のドレイン領域、及び、前記第2のソース領域及び前記第2のドレイン領域間の前記第2の導電型の第2のチャネル領域を含む第2の半導体領域を形成する工程と、
前記第1及び第2の半導体領域上に、前記第1及び第2の半導体領域と異なる材料を含む半導体層を、それぞれ形成する工程と、
前記第1の半導体領域上方のゲート絶縁膜上に、第1の材料の第1のゲート電極を形成するのと同時に、前記第2の半導体領域上方のゲート絶縁膜上に、前記第1の材料の第2のゲート電極を、形成する工程と、
を具備する半導体デバイスの製造方法。 - 前記第1及び第2の半導体領域は、多結晶半導体領域である、
請求項8に記載の半導体デバイスの製造方法。 - 前記第1及び第2の半導体領域は、ゲルマニウムを主成分としている、
請求項8又は9に記載の半導体デバイスの製造方法。 - 前記半導体層は、シリコンを主成分としている、
請求項8乃至10のいずれか1項に記載の半導体デバイスの製造方法。
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