JP2017120905A - トランジスタおよび半導体装置 - Google Patents
トランジスタおよび半導体装置 Download PDFInfo
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- JP2017120905A JP2017120905A JP2016250639A JP2016250639A JP2017120905A JP 2017120905 A JP2017120905 A JP 2017120905A JP 2016250639 A JP2016250639 A JP 2016250639A JP 2016250639 A JP2016250639 A JP 2016250639A JP 2017120905 A JP2017120905 A JP 2017120905A
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- Prior art keywords
- insulator
- oxide
- transistor
- conductor
- semiconductor
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Abstract
Description
本実施の形態では、半導体装置の一形態を、図1乃至図6、および図7を用いて説明する。
本発明の一態様の半導体装置(記憶装置)の一例を図1乃至図6、および図7に示す。なお、図7(A)は、図1乃至図6を回路図で表したものである。
図1乃至図6、および図7(A)に示す半導体装置は、トランジスタ300と、トランジスタ200、および容量素子100を有している。
図7(B)に示す半導体装置は、トランジスタ300を有さない点で図7(A)に示した半導体装置と異なる。この場合も図7(A)に示した半導体装置と同様の動作により情報の書き込みおよび保持動作が可能である。
本発明の一態様の半導体装置は、図1に示すようにトランジスタ300、トランジスタ200、容量素子100を有する。トランジスタ200はトランジスタ300の上方に設けられ、容量素子100はトランジスタ300、およびトランジスタ200の上方に設けられている。
本実施の形態では、半導体装置の一形態を、図8乃至図12を用いて説明する。
以下では、本発明の一態様に係るトランジスタの一例について説明する。図8(A)、図8(B)、および図8(C)は、本発明の一態様に係るトランジスタの上面図および断面図である。図8(A)は上面図であり、図8(B)は、図8(A)に示す一点鎖線X1−X2、図8(C)は、一点鎖線Y1−Y2に対応する断面図である。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(A)は、図3に示すトランジスタ200Aの上面を示す。なお、図の明瞭化のため、図9(A)において一部の膜は省略されている。また、図9(B)は、図9(A)に示す一点鎖線X1−X2に対応する断面図であり、図9(C)はY1−Y2に対応する断面図である。
図10には、図1等に示すトランジスタ200に適用できる構造の一例を示す。図10(A)はトランジスタ200Dの上面を示す。なお、図の明瞭化のため、図10(A)において一部の膜は省略されている。また、図10(B)は、図10(A)に示す一点鎖線X1−X2に対応する断面図であり、図10(C)はY1−Y2に対応する断面図である。
図11には、図1等に示すトランジスタ200に適用できる構造の一例を示す。図11(A)はトランジスタ200Eの上面を示す。なお、図の明瞭化のため、図11(A)において一部の膜は省略されている。また、図11(B)は、図11(A)に示す一点鎖線X1−X2に対応する断面図であり、図11(C)はY1−Y2に対応する断面図である。
図12は、図1等に示すトランジスタ200に適用できる構造の一例を示す。図12(A)はトランジスタ200Fの上面を示す。なお、図の明瞭化のため、図12(A)において一部の膜は省略されている。また、図12(B)は、図12(A)に示す一点鎖線X1−X2に対応する断面図であり、図12(C)はY1−Y2に対応する断面図である。
本実施の形態では、上記構成例で示したトランジスタの作製方法の一例について、図16乃至図19を用いて説明する。
図8に示すトランジスタ200の作製方法について、以下より説明する。具体的には、図1における絶縁体212が形成された状態から、絶縁体282が形成されるまでにおける、トランジスタ200を含む領域の作製工程について説明する。なお、図16乃至図19に示す断面図は、図8(A)に示す一点鎖線X1−X2および一点鎖線Y1−Y2に対応している。
本実施の形態においては、先の実施の形態で例示したトランジスタが有する酸化物半導体について、図20乃至図24を用いて以下説明を行う。
酸化物半導体は、単結晶酸化物半導体と、それ以外の非単結晶酸化物半導体と、に分けられる。非単結晶酸化物半導体としては、CAAC−OS(c−axis−aligned crystalline oxide semiconductor)、多結晶酸化物半導体、nc−OS(nanocrystalline oxide semiconductor)、擬似非晶質酸化物半導体(a−like OS:amorphous−like oxide semiconductor)および非晶質酸化物半導体などがある。
まずは、CAAC−OSについて説明する。
次に、nc−OSについて説明する。
a−like OSは、nc−OSと非晶質酸化物半導体との間の構造を有する酸化物半導体である。
次に、酸化物半導体のキャリア密度について、以下に説明を行う。
本実施の形態においては、本発明の一態様に係るトランジスタや上述した記憶装置などを含むCPUの一例について説明する。
図25に示す半導体装置400は、CPUコア401、パワーマネージメントユニット421および周辺回路422を有する。パワーマネージメントユニット421は、パワーコントローラ402、およびパワースイッチ403を有する。周辺回路422は、キャッシュメモリを有するキャッシュ404、バスインターフェース(BUS I/F)405、及びデバッグインターフェース(Debug I/F)406を有する。CPUコア401は、データバス423、制御装置407、PC(プログラムカウンタ)408、パイプラインレジスタ409、パイプラインレジスタ410、ALU(Arithmetic logic unit)411、及びレジスタファイル412を有する。CPUコア401と、キャッシュ404等の周辺回路422とのデータのやり取りは、データバス423を介して行われる。
本実施の形態においては、本発明の一態様に係る半導体装置を含む半導体ウエハ、チップおよび当該チップを適用した電子部品について、図27および図28を用いて説明する。
図27(A)は、ダイシング処理が行なわれる前の基板1711の上面図を示している。基板1711としては、例えば、半導体基板(「半導体ウエハ」ともいう。)を用いることができる。基板1711上には、複数の回路領域1712が設けられている。回路領域1712には、本発明の一態様に係る半導体装置や、CPU、RFタグ、またはイメージセンサなどを設けることができる。
チップ1715を電子部品に適用する例について、図28を用いて説明する。なお、電子部品は、半導体パッケージ、またはIC用パッケージともいう。電子部品は、端子取り出し方向や、端子の形状に応じて、複数の規格や名称が存在する。
本実施の形態においては、本発明の一態様に係るトランジスタなどを利用した表示装置について、図29および図30を用いて説明する。
表示装置に用いられる表示素子としては液晶素子(液晶表示素子ともいう。)、発光素子(発光表示素子ともいう。)などを用いることができる。発光素子は、電流または電圧によって輝度が制御される素子をその範疇に含んでおり、具体的には無機EL(Electroluminescence)、有機ELなどを含む。以下では、表示装置の一例としてEL素子を用いた表示装置(EL表示装置)および液晶素子を用いた表示装置(液晶表示装置)について説明する。
本実施の形態においては、本発明の一態様に係るトランジスタなどを利用した電子機器について説明する。
本発明の一態様に係る半導体装置は、表示機器、パーソナルコンピュータ、記録媒体を備えた画像再生装置(代表的にはDVD:Digital Versatile Disc等の記録媒体を再生し、その画像を表示しうるディスプレイを有する装置)に用いることができる。その他に、本発明の一態様に係る半導体装置を用いることができる電子機器として、携帯電話、携帯型を含むゲーム機、携帯データ端末、電子書籍端末、ビデオカメラ、デジタルスチルカメラ等のカメラ、ゴーグル型ディスプレイ(ヘッドマウントディスプレイ)、ナビゲーションシステム、音響再生装置(カーオーディオ、デジタルオーディオプレイヤー等)、複写機、ファクシミリ、プリンタ、プリンタ複合機、現金自動預け入れ払い機(ATM)、自動販売機などが挙げられる。これら電子機器の具体例を図31に示す。
Claims (8)
- 第2のゲート電極として機能する第1の導電体と、
前記第1の導電体上の第1の絶縁体と、
前記第1の絶縁体上の第2の絶縁体と、
前記第2の絶縁体上の第3の絶縁体と、
前記第3の絶縁体上の第1の酸化物と、
前記第1の酸化物上の酸化物半導体と、
前記酸化物半導体上の第2の導電体と、
前記第3の絶縁体上、前記第1の酸化物上、前記酸化物半導体上および前記第2の導電体上の第2の酸化物と、
前記第2の酸化物上の第4の絶縁体と、
前記第4の絶縁体上の第3の導電体と、
前記第3の導電体上の第4の導電体と、
前記第4の絶縁体上、前記第3の導電体上および前記第4の導電体上の第5の絶縁体と、
前記第2の酸化物上、前記第4の絶縁体上および前記第5の絶縁体上の第6の絶縁体と、を有し、
前記酸化物半導体は、前記第1の酸化物と端部が概略一致して設けられ、
前記第2の導電体は、ソースまたはドレインとして機能する領域を有し、
前記第4の絶縁体は、ゲート絶縁膜として機能する領域を有し、
前記第3の導電体は、第1のゲート電極として機能する領域を有し、
前記第4の導電体は、第1のゲート電極として機能する領域を有し、
前記第4の導電体は、前記第3の導電体と端部が概略一致して設けられ、
前記第4の絶縁体と、前記第5の絶縁体とは、端部が概略一致し、
前記第2の導電体は、前記第2の酸化物によって前記第6の絶縁体と離間し、
前記第3の導電体および前記第4の導電体は、前記第5の絶縁体によって前記第6の絶縁体と離間し、
前記第1の絶縁体、前記第3の絶縁体、前記第4の絶縁体および前記第6の絶縁体は、化学量論的組成よりも過剰に酸素を含む領域を有し、
前記第2の酸化物は、酸素の透過を、前記第6の絶縁体に含まれる酸素が前記第2の酸化物を介して前記酸化物半導体に十分に供給される程度に抑制する機能を有し、
前記第5の絶縁体は、酸素に対してバリア性を有する、
トランジスタ。 - 請求項1において、
前記第1の酸化物、前記酸化物半導体および前記第2の酸化物は、In−M−Zn酸化物(MはAl、Ga、YまたはSn)を含む、
トランジスタ。 - 請求項1または請求項2において、
前記第2の導電体は、タングステンを含む、
トランジスタ。 - 請求項3において、
前記第2の導電体は、TDS分析により、50℃から500℃の範囲において、酸素原子に換算した酸素の脱離量が、3.4×1015atoms/cm2以下であるタングステンである、
トランジスタ。 - 請求項1乃至請求項4のいずれか一において、
前記第3の導電体は、窒化チタンを含み、
前記第4の導電体は、タングステンを含む、
トランジスタ。 - 請求項1乃至請求項5のいずれか一に記載のトランジスタと、
容量素子と、を有し、
前記トランジスタのソースおよびドレインの一方と、前記容量素子の一対の電極の一方とが電気的に接続される、
半導体装置。 - 請求項6において、
第2のトランジスタを有し、
前記第2のトランジスタは、半導体領域にシリコンを含み、
前記トランジスタのソースおよびドレインの一方と、前記第2のトランジスタのゲートとが電気的に接続される、
半導体装置。 - 請求項1乃至請求項5のいずれか一に記載のトランジスタ、または、請求項6もしくは請求項7に記載の半導体装置を有し、
ダイシング用の領域を有する、
半導体ウエハ。
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