JP7337777B2 - 半導体装置 - Google Patents
半導体装置 Download PDFInfo
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- JP7337777B2 JP7337777B2 JP2020512106A JP2020512106A JP7337777B2 JP 7337777 B2 JP7337777 B2 JP 7337777B2 JP 2020512106 A JP2020512106 A JP 2020512106A JP 2020512106 A JP2020512106 A JP 2020512106A JP 7337777 B2 JP7337777 B2 JP 7337777B2
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- conductor
- insulator
- transistor
- oxide
- semiconductor
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- H01L21/76801—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 dielectrics, e.g. smoothing
- H01L21/76829—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 dielectrics, e.g. smoothing characterised by the formation of thin functional dielectric layers, e.g. dielectric etch-stop, barrier, capping or liner layers
- H01L21/76831—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 dielectrics, e.g. smoothing characterised by the formation of thin functional dielectric layers, e.g. dielectric etch-stop, barrier, capping or liner layers in via holes or trenches, e.g. non-conductive sidewall liners
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Description
本実施の形態では、図1乃至図11を用いて、本発明の一態様である半導体装置について説明する。
図1は、本発明の一態様である複数のトランジスタを有する半導体装置の一領域を抜き出したものである。図1(A)は、トランジスタ200を有する領域の上面図を示す。図1(B)は、図1(A)に一点鎖線A5-A6で示す部位の断面図である。図1(C)は、図1(A)に一点鎖線A1-A2で示す部位の断面図である。また、図1(D)は、図1(A)に一点鎖線A3-A4で示す部位の断面図である。なお、図1では、図の明瞭化のために一部の要素を省いて図示している。
例えば、図1(E)、および図1(F)に示すように、半導体層230よりも外側まで開口部を設ける構造としてもよい。このとき、半導体層230を線状としてもよい。なお、図では、半導体層230を直線状で示したが、曲線を有していてもよい。半導体層230を一次元的に配置することで、微細な形状が形成しやすくなる。また、半導体層の幅が一定である構造は、レイアウト設計の自由度が向上するため好ましい。つまり、トランジスタの微細化、および高集積化が容易となる。
次に、図1に示す、本発明に係るトランジスタ200を有する半導体装置について、作製方法を図2乃至図5を用いて説明する。また、図2乃至図5において、各図の(A)、および(D)は上面図を示す。また、各図の(B)は、(A)に示すA5-A6の一点鎖線で示す部位に対応する断面図である。また、各図の(C)は、(A)にA1-A2の一点鎖線で示す部位に対応する断面図である。また、各図の(E)は、(D)に示すA5-A6の一点鎖線で示す部位に対応する断面図である。また、各図の(F)は、(D)にA1-A2の一点鎖線で示す部位に対応する断面図である。なお、各図の(A)の上面図では、図の明瞭化のために一部の要素を省いて図示している。
本実施の形態では、上記実施の形態に示すトランジスタ200の構造例について、図6乃至図11を用いて、説明する。なお、本実施の形態に示すトランジスタ200は、酸化物半導体を有する。
以下では、図6、および図7を用いてトランジスタ200Aの構造例を説明する。図6(A)はトランジスタ200Aの上面図である。なお、図6(A)の上面図では、図の明瞭化のために一部の要素を省いて図示している。図6(B)は、図6(A)に一点鎖線L1-L2で示す部位の断面図である。図6(C)は、図6(A)に一点鎖線W1-W2で示す部位の断面図である。また、図6(D)は、図6(A)に一点鎖線W3-W4で示す部位の断面図である。また、図7は、図6(C)において、導電体260、および導電体203の延長上の領域を示す断面図である。
以下では、図8を用いてトランジスタ200Bの構造例を説明する。図8(A)はトランジスタ200Bの上面図である。図8(B)は、図8(A)に一点鎖線L1-L2で示す部位の断面図である。図8(C)は、図8(A)に一点鎖線W1-W2で示す部位の断面図である。図8(D)は、図8(A)に一点鎖線W3-W4で示す部位の断面図である。なお、図8(A)の上面図では、図の明瞭化のために一部の要素を省いて図示している。
図9を用いてトランジスタ200Cの構造例を説明する。図9(A)はトランジスタ200Cの上面図である。図9(B)は、図9(A)に一点鎖線L1-L2で示す部位の断面図である。図9(C)は、図9(A)に一点鎖線W1-W2で示す部位の断面図である。図9(D)は、図9(A)に一点鎖線W3-W4で示す部位の断面図である。なお、図9(A)の上面図では、図の明瞭化のために一部の要素を省いて図示している。
図10を用いてトランジスタ200Dの構造例を説明する。図10(A)はトランジスタ200Dの上面図である。図10(B)は、図10(A)に一点鎖線L1-L2で示す部位の断面図である。図10(C)は、図10(A)に一点鎖線W1-W2で示す部位の断面図である。図10(D)は、図10(A)に一点鎖線W3-W4で示す部位の断面図である。なお、図10(A)の上面図では、図の明瞭化のために一部の要素を省いて図示している。
図11を用いてトランジスタ200Eの構造例を説明する。図11(A)はトランジスタ200Eの上面図である。図11(B)は、図11(A)に一点鎖線L1-L2で示す部位の断面図である。図11(C)は、図11(A)に一点鎖線W1-W2で示す部位の断面図である。図11(D)は、図11(A)に一点鎖線W3-W4で示す部位の断面図である。なお、図11(A)の上面図では、図の明瞭化のために一部の要素を省いて図示している。
本実施の形態では、図12および図13を用いて、本発明の一態様に係る、酸化物を半導体に用いたトランジスタ(以下、OSトランジスタと呼ぶ場合がある。)、および容量素子が適用されている記憶装置(以下、OSメモリ装置と呼ぶ場合がある。)について説明する。OSメモリ装置は、少なくとも容量素子と、容量素子の充放電を制御するOSトランジスタを有する記憶装置である。OSトランジスタのオフ電流は極めて小さいので、OSメモリ装置は優れた保持特性をもち、不揮発性メモリとして機能させることができる。
図12(A)にOSメモリ装置の構成の一例を示す。記憶装置1400は、周辺回路1411、およびメモリセルアレイ1470を有する。周辺回路1411は、行回路1420、列回路1430、出力回路1440、およびコントロールロジック回路1460を有する。
図13(A)乃至(C)に、DRAMのメモリセルの回路構成例を示す。本明細書等において、1OSトランジスタ1容量素子型のメモリセルを用いたDRAMを、DOSRAMと呼ぶ場合がある。図13(A)に示す、メモリセル1471は、トランジスタM1と、容量素子CAと、を有する。なお、トランジスタM1は、ゲート(トップゲートと呼ぶ場合がある。)、及びパックゲートを有する。
図13(D)乃至(H)に、2トランジスタ1容量素子のゲインセル型のメモリセルの回路構成例を示す。図13(D)に示す、メモリセル1474は、トランジスタM2と、トランジスタM3と、容量素子CBと、を有する。なお、トランジスタM2は、トップゲート(単にゲートと呼ぶ場合がある。)、およびバックゲートを有する。本明細書等において、トランジスタM2にOSトランジスタを用いたゲインセル型のメモリセルを有する記憶装置を、NOSRAM(Nonvolatile Oxide Semiconductor RAM)と呼ぶ場合がある。
本実施の形態では、図14を用いて、本発明の半導体装置が実装されたチップ1200の一例を示す。チップ1200には、複数の回路(システム)が実装されている。このように、複数の回路(システム)を一つのチップに集積する技術を、システムオンチップ(System on Chip:SoC)と呼ぶ場合がある。
本実施の形態では、先の実施の形態に示す半導体装置を用いた記憶装置の応用例について説明する。先の実施の形態に示す半導体装置は、例えば、各種電子機器(例えば、情報端末、コンピュータ、スマートフォン、電子書籍端末、デジタルカメラ(ビデオカメラも含む)、録画再生装置、ナビゲーションシステムなど)の記憶装置に適用できる。なお、ここで、コンピュータとは、タブレット型のコンピュータ、ノート型のコンピュータ、デスクトップ型のコンピュータの他、サーバシステムのような大型のコンピュータを含むものである。または、先の実施の形態に示す半導体装置は、メモリカード(例えば、SDカード)、USBメモリ、SSD(ソリッド・ステート・ドライブ)等の各種のリムーバブル記憶装置に適用される。図15にリムーバブル記憶装置の幾つかの構成例を模式的に示す。例えば、先の実施の形態に示す半導体装置は、パッケージングされたメモリチップに加工され、様々なストレージ装置、リムーバブルメモリに用いられる。
本発明の一態様に係る半導体装置は、CPUやGPUなどのプロセッサ、またはチップに用いることができる。図16に、本発明の一態様に係るCPUやGPUなどのプロセッサ、またはチップを備えた電子機器の具体例を示す。
本発明の一態様に係るGPU又はチップは、様々な電子機器に搭載することができる。電子機器の例としては、例えば、テレビジョン装置、デスクトップ型もしくはノート型のパーソナルコンピュータ、コンピュータ用などのモニタ、デジタルサイネージ(Digital Signage:電子看板)、パチンコ機などの大型ゲーム機などの比較的大きな画面を備える電子機器の他、デジタルカメラ、デジタルビデオカメラ、デジタルフォトフレーム、携帯電話機、携帯型ゲーム機、携帯情報端末、音響再生装置、などが挙げられる。また、本発明の一態様に係る集積回路又はチップを電子機器に設けることにより、電子機器に人工知能を搭載することができる。
図16(B)には、デスクトップ型情報端末5300が図示されている。デスクトップ型情報端末5300は、情報端末の本体5301と、ディスプレイ5302と、キーボード5303と、を有する。
図16(C)は、電化製品の一例である電気冷凍冷蔵庫5800を示している。電気冷凍冷蔵庫5800は、筐体5801、冷蔵室用扉5802、冷凍室用扉5803等を有する。
本発明の一態様のGPU又はチップは、移動体である自動車、及び自動車の運転席周辺に適用することができる。
本発明の一態様のGPU又はチップは、放送システムに適用することができる。
Claims (4)
- 第1の絶縁体、第2の絶縁体、第1の導電体、第2の導電体、および半導体層、を有し、
前記第1の絶縁体は、前記半導体層を露出する開口部を有し、
前記第1の導電体は、前記開口部の底面に、前記半導体層と接して配置され、
前記第2の絶縁体は、前記第1の導電体の上面および前記開口部内の側面と接して配置され、
前記第2の導電体は、前記第1の導電体の上面と接し、前記第2の絶縁体を介して前記開口部内に配置され、
前記第2の絶縁体は、ハフニウム、アルミニウム、ホウ素、ガリウム、亜鉛、イットリウム、ジルコニウム、タングステン、チタン、タンタル、ニッケル、ゲルマニウム、または、マグネシウムから選ばれた一種、または二種以上が含まれた酸化物、またはアルミニウムまたはシリコンを含む窒化物を含み、
前記半導体層は、Inと、元素M(MはAl、Ga、Y、またはSn)と、Znと、を有する半導体装置。 - 請求項1において、
前記第1の導電体は、難酸化性である半導体装置。 - 請求項1または2において、
前記第1の導電体は、前記第2の導電体よりも、投影面積が大きい半導体装置。 - 請求項1乃至請求項3のいずれか一において、
前記第1の絶縁体は過剰酸素を有し、前記第2の絶縁体は酸素に対するバリア性を有する半導体装置。
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