JP5651439B2 - 半導体装置 - Google Patents
半導体装置 Download PDFInfo
- Publication number
- JP5651439B2 JP5651439B2 JP2010255517A JP2010255517A JP5651439B2 JP 5651439 B2 JP5651439 B2 JP 5651439B2 JP 2010255517 A JP2010255517 A JP 2010255517A JP 2010255517 A JP2010255517 A JP 2010255517A JP 5651439 B2 JP5651439 B2 JP 5651439B2
- Authority
- JP
- Japan
- Prior art keywords
- transistor
- oxide semiconductor
- electrode
- inverter
- insulating layer
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
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Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K3/00—Circuits for generating electric pulses; Monostable, bistable or multistable circuits
- H03K3/02—Generators characterised by the type of circuit or by the means used for producing pulses
- H03K3/353—Generators characterised by the type of circuit or by the means used for producing pulses by the use, as active elements, of field-effect transistors with internal or external positive feedback
- H03K3/356—Bistable circuits
- H03K3/356104—Bistable circuits using complementary field-effect transistors
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11C—STATIC STORES
- G11C14/00—Digital stores characterised by arrangements of cells having volatile and non-volatile storage properties for back-up when the power is down
- G11C14/0054—Digital stores characterised by arrangements of cells having volatile and non-volatile storage properties for back-up when the power is down in which the volatile element is a SRAM cell
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- H01L29/66409—Unipolar field-effect transistors
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Description
本実施の形態は、開示する発明の一態様である不揮発性のラッチ回路の構成、動作、不揮発性のラッチ回路が有する素子の作製方法等について、図1、図2、図3乃至図6、図7乃至図17を参照して説明する。
図1(A)は、ラッチ部411と、ラッチ部のデータを保持するデータ保持部401とを有する不揮発性のラッチ回路400の構成を示している。図1(B)は、データ保持部401の構成を示している。
図3は、上記不揮発性のラッチ回路が有するトランジスタ402と、トランジスタ402以外の素子の構成の一例である。ここではトランジスタ402以外の素子として、データ保持部401のインバータ403が有するトランジスタ421を例に説明する。トランジスタ402以外のその他の素子は、トランジスタ421と同一又は類似の構成とすることができる。容量404などの素子は、トランジスタ402又はトランジスタ402以外の素子を構成する膜を利用して形成することができる。図3(A)には断面を、図3(B)には平面をそれぞれ示す。ここで、図3(A)は、図3(B)の線A1−A2および線B1−B2における断面に相当する。図3(A)および図3(B)に示すように、下部に酸化物半導体以外の材料を用いたトランジスタ421が設けられ、上部に酸化物半導体を用いたトランジスタ402が設けられている。
次に、上記不揮発性のラッチ回路が有する素子の作製方法の一例について説明する。以下では、はじめに下部のトランジスタ421の作製方法について図4を参照して説明し、その後、上部のトランジスタ402の作製方法について図5および図6を参照して説明する。
まず、半導体材料を含む基板100を用意する(図4(A)参照)。半導体材料を含む基板100としては、シリコンや炭化シリコンなどの単結晶半導体基板、多結晶半導体基板、シリコンゲルマニウムなどの化合物半導体基板、SOI基板などを適用することができる。ここでは、半導体材料を含む基板100として、単結晶シリコン基板を用いる場合の一例について示すものとする。なお、一般に「SOI基板」は、絶縁表面上にシリコン半導体層が設けられた構成の基板をいうが、本明細書等においては、絶縁表面上にシリコン以外の材料からなる半導体層が設けられた構成の基板をも含む概念として用いる。つまり、「SOI基板」が有する半導体層は、シリコン半導体層に限定されない。また、SOI基板には、ガラス基板などの絶縁基板上に絶縁層を介して半導体層が設けられた構成のものも含まれるものとする。
次に、図5および図6を用いて、層間絶縁層128上にトランジスタ402を作製する工程について説明する。なお、図5および図6は、層間絶縁層128上の各種電極や、トランジスタ402などの作製工程を示すものであるから、トランジスタ402の下部に存在するトランジスタ421等については省略している。
ここで、酸化物半導体を用いたトランジスタの電導機構につき、図7乃至図10を用いて説明する。なお、以下の説明では、理解の容易のため理想的な状況を仮定しており、そのすべてが現実の様子を反映しているとは限らない。また、以下の説明はあくまでも一考察に過ぎず、発明の有効性に影響を与えるものではないことを付記する。
次に、酸化物半導体を用いたトランジスタのホットキャリア劣化耐性につき、図11乃至図13を用いて説明する。なお、以下の説明では、理解の容易のため理想的な状況を仮定しており、そのすべてが現実の様子を反映しているとは限らない。また、以下の説明はあくまでも一考察に過ぎないことを付記する。
次に、酸化物半導体を用いたトランジスタにおける短チャネル効果に関し、図14及び図15を用いて説明する。なお、以下の説明では、理解の容易のため理想的な状況を仮定しており、そのすべてが現実の様子を反映しているとは限らない。また、以下の説明はあくまでも一考察に過ぎないことを付記する。
開示する発明に係る技術思想は、酸化物半導体層におけるキャリア濃度を十分に低くし、できるだけ真性(i型)に近づけようとするものである。以下、キャリア濃度の求め方、および、実際に測定したキャリア濃度に関し、図16および図17を参照して説明する。
本実施の形態は、開示する発明の一態様である不揮発性のラッチ回路の構成について、図1とは異なる例を図18を参照して説明する。図18(A)は、ラッチ部411と、ラッチ部のデータを保持するデータ保持部401とを有する不揮発性のラッチ回路400の構成を示している。図18(B)は、データ保持部401の構成を示している。
本実施の形態は、開示する発明の一態様である不揮発性のラッチ回路の構成、動作について、図19、図1を参照して説明する。
本実施の形態は、開示する発明の一態様である不揮発性のラッチ回路の構成、動作について、図19とは異なる例を図20、図18を参照して説明する。図20(A)は、ラッチ部411と、ラッチ部のデータを保持するデータ保持部401とを有する不揮発性のラッチ回路400の構成を示している。図20(B)は、不揮発性のラッチ回路400のタイミングチャートの例を示している。
本実施の形態は、開示する発明の一態様である不揮発性のラッチ回路の構成、動作について、図19とは異なる例を図21を参照して説明する。図21(A)は、不揮発性のラッチ回路400の構成を示している。不揮発性のラッチ回路400の構成は、図19(A)と同様である。図21(B)は、不揮発性のラッチ回路400のタイミングチャートの例を示している。
本実施の形態は、開示する発明の一態様である不揮発性のラッチ回路を複数有する論理回路の構成について、図22を参照して説明する。
本実施の形態では、先の実施の形態で得られる不揮発性のラッチ回路を用いた半導体装置を搭載した電子機器の例について図23を用いて説明する。先の実施の形態で得られる不揮発性のラッチ回路を用いた半導体装置を搭載した電子機器は、従来にない優れた特性を有するものである。このため、当該不揮発性のラッチ回路を用いた半導体装置を用いて新たな構成の電子機器を提供することが可能である。なお、先の実施の形態に係る不揮発性のラッチ回路を用いた半導体装置は、集積化されて回路基板などに実装され、各電子機器の内部に搭載されることになる。
102 保護層
104 半導体領域
106 素子分離絶縁層
108a ゲート絶縁層
110a ゲート電極
112 絶縁層
114 不純物領域
116 チャネル形成領域
118 サイドウォール絶縁層
120 高濃度不純物領域
122 金属層
124 金属化合物領域
126 層間絶縁層
128 層間絶縁層
130a ドレイン電極
130b ドレイン電極
130c 電極
132 絶縁層
134 導電層
136a 電極
136b 電極
136c 電極
136d ゲート電極
138 ゲート絶縁層
140 酸化物半導体層
142a ドレイン電極
142b ドレイン電極
144 保護絶縁層
146 層間絶縁層
148 導電層
150a 電極
150b 電極
150c 電極
150d 電極
150e 電極
152 絶縁層
154a 電極
154b 電極
154c 電極
154d 電極
301 本体
302 筐体
303 表示部
304 キーボード
311 本体
312 スタイラス
313 表示部
314 操作ボタン
315 外部インターフェイス
320 電子書籍
321 筐体
323 筐体
325 表示部
327 表示部
331 電源
333 操作キー
335 スピーカー
337 軸部
340 筐体
341 筐体
342 表示パネル
343 スピーカー
344 マイクロフォン
345 操作キー
346 ポインティングデバイス
347 カメラ用レンズ
348 外部接続端子
349 太陽電池セル
350 外部メモリスロット
361 本体
363 接眼部
364 操作スイッチ
365 表示部(B)
366 バッテリー
367 表示部(A)
370 テレビジョン装置
371 筐体
373 表示部
375 スタンド
377 表示部
379 操作キー
380 リモコン操作機
400 ラッチ回路
400a ラッチ回路
400b ラッチ回路
401 データ保持部
402 トランジスタ
403 インバータ
404 容量
405 スイッチ
411 ラッチ部
412 第1の素子
413 第2の素子
414 配線
415 配線
420 トランジスタ
421 トランジスタ
431 スイッチ
432 スイッチ
501 Nチャネル型トランジスタ
502 Nチャネル型トランジスタ
503 Pチャネル型トランジスタ
504 Pチャネル型トランジスタ
505 Pチャネル型トランジスタ
506 Pチャネル型トランジスタ
Claims (1)
- 第1のインバータと、
第2のインバータと、
第1のトランジスタと、
第2のトランジスタを有する、第3のインバータと、
容量とを有し、
前記第1のトランジスタは、酸化物半導体を有し、
前記第2のトランジスタは、シリコンを有し、
前記第1のインバータの入力は、第1の配線と電気的に接続され、
前記第1のインバータの出力は、第2の配線と電気的に接続され、
前記第1の配線は、前記第1のインバータへの入力信号を伝達する機能を有する配線であり、
前記第2の配線は、前記第1のインバータからの出力信号を伝達する機能を有する配線であり、
前記第1のインバータの出力は、前記第2のインバータの入力と電気的に接続され、
前記第2のインバータの出力は、前記第1のインバータの入力と電気的に接続され、
前記第1のトランジスタのソース又はドレインの一方は、前記第1のインバータの出力と電気的に接続され、
前記第1のトランジスタのソース又はドレインの他方は、前記容量の電極と電気的に接続され、
前記第1のトランジスタのソース又はドレインの他方は、前記第3のインバータが有する第2のトランジスタのゲートと電気的に接続され、
前記第3のインバータの出力は、前記第1の配線と電気的に接続され、
前記第1のトランジスタがオフ状態となることにより、前記容量の電極と、前記第1のトランジスタのソース又はドレインの他方と、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ているノードがフローティング状態となり、
前記第1のトランジスタのソース又はドレインの一方及び他方は、酸化物導電膜を有し、前記酸化物導電膜は酸素欠損を有することを特徴とする半導体装置。
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