JP2015079951A - 半導体装置および半導体装置の作製方法 - Google Patents
半導体装置および半導体装置の作製方法 Download PDFInfo
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- JP2015079951A JP2015079951A JP2014184827A JP2014184827A JP2015079951A JP 2015079951 A JP2015079951 A JP 2015079951A JP 2014184827 A JP2014184827 A JP 2014184827A JP 2014184827 A JP2014184827 A JP 2014184827A JP 2015079951 A JP2015079951 A JP 2015079951A
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- oxide semiconductor
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Classifications
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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
- H01L29/786—Thin film transistors, i.e. transistors with a channel being at least partly a thin film
- H01L29/7869—Thin film transistors, i.e. transistors with a channel being at least partly a thin film having a semiconductor body comprising an oxide semiconductor material, e.g. zinc oxide, copper aluminium oxide, cadmium stannate
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- G11C16/0466—Erasable programmable read-only memories electrically programmable using variable threshold transistors, e.g. FAMOS comprising cells with charge storage in an insulating layer, e.g. metal-nitride-oxide-silicon [MNOS], silicon-oxide-nitride-oxide-silicon [SONOS]
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
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- H01L29/40—Electrodes ; Multistep manufacturing processes therefor
- H01L29/43—Electrodes ; Multistep manufacturing processes therefor characterised by the materials of which they are formed
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
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Abstract
【解決手段】半導体と、半導体に電気的に接するソース電極あるいはドレイン電極と、半導体を間に挟んで設けられる第1のゲート電極と第2のゲート電極と、第1のゲート電極と半導体との間に設けられる電荷捕獲層と、第2のゲート電極と半導体との間に設けられるゲート絶縁層を有する半導体装置において、加熱しつつ、第1のゲート電極の電位をソース電極やドレイン電極よりも高くし、かつ、1秒以上保持することで、電荷捕獲層に電子を捕獲させることで、しきい値を増大させる。処理後は、第1のゲート電極を除去する、あるいは他の回路から絶縁する。あるいは、第1のゲート電極と他の回路との間に抵抗を設けてもよい。
【選択図】図2
Description
本実施の形態では、半導体層と電荷捕獲層とゲート電極とを有する半導体装置の構成および動作原理、および、それを応用する回路について説明する。図1(A)は、半導体層101と電荷捕獲層102とゲート電極103とゲート絶縁層104とゲート電極105とを有する半導体装置である。
本実施の形態では、半導体装置について図面を用いて説明する。最初に図9乃至図12を用いて、半導体装置(トランジスタ)の作製方法の例を説明する。
また、本明細書において、結晶が三方晶または菱面体晶である場合、六方晶系として表す。
非単結晶酸化物半導体とは、CAAC−OS(C Axis Aligned Crystalline Oxide Semiconductor)、多結晶酸化物半導体、微結晶酸化物半導体、非晶質酸化物半導体などをいう。
本実施の形態では、半導体装置の断面構造の一例について、図16を参照して説明する。本実施の形態の例では、実施の形態1で示したトランジスタが他の回路(トランジスタ等)に積層して形成される。
n型のトランジスタ240は、p型ウェル230pに設けられたチャネル形成領域224と、チャネル形成領域224を挟むように設けられた低濃度不純物領域225及び高濃度不純物領域226(これらを合わせて単に不純物領域とも呼ぶ)と、該不純物領域に接して設けられた導電性領域237と、チャネル形成領域224上に設けられたゲート絶縁層234aと、ゲート絶縁層234a上に設けられたゲート電極235aと、導電性領域237と接して設けられたソース電極236a及びドレイン電極236bと、を有する。ゲート電極235aの側面には、サイドウォール絶縁物238aが設けられている。トランジスタ240を覆うように層間絶縁物251及び層間絶縁物252が設けられている。層間絶縁物251及び層間絶縁物252に形成された開口を通じて、ソース電極236a及びドレイン電極236bと、導電性領域237とが接続されている。なお、導電性領域237には、金属シリサイド等を用いることができる。
上部のトランジスタ260は、シリコンよりもバンドギャップが広い半導体にチャネルが形成されるトランジスタである。トランジスタ260は、層間絶縁物254上に設けられた導電層255bと、導電層255b上に設けられたゲート絶縁層261、ゲート絶縁層261上に設けられた第1の半導体層262aおよび第2の半導体層262bと、第1の半導体層262aおよび第2の半導体層262b上に設けられた絶縁層263a、絶縁層263b、絶縁層263cと、絶縁層263c上に設けられ、絶縁層263a、絶縁層263b、絶縁層263cに設けられたコンタクトホールを介して第2の半導体層262bに接する導電層264a、導電層264bと、絶縁層263c、導電層264a、導電層264b上に設けられた層間絶縁物265とを有する。なお、導電層255aは、ゲート電極として機能する。また、層間絶縁物265の上にはしきい値補正用電極266が設けられる。
本実施の形態では、少なくとも先の実施の形態で説明したトランジスタを用いることができ、先の実施の形態で説明した記憶装置を含むCPUについて説明する。
上記に示した半導体装置は、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、上記に示した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、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19に示す。
102 電荷捕獲層
102a 第1の絶縁層
102b 第2の絶縁層
102c 第3の絶縁層
102d 導電層
102e 絶縁体
103 ゲート電極
104 ゲート絶縁層
105 ゲート電極
106 電子捕獲準位
107 電子
108 曲線
109 曲線
110 トランジスタ
111 容量素子
121 トランジスタ
122 トランジスタ
123 容量素子
124 トランジスタ
125 容量素子
201 絶縁体
202 ゲート電極
203 ゲート絶縁層
204a 酸化物半導体層
204b 酸化物半導体層
204c 酸化物半導体層
205a ソース電極
205b ドレイン電極
206 第1の絶縁層
207 第2の絶縁層
208 第3の絶縁層
209 しきい値補正用電極
210 半導体チップ
211 パッド
211a パッド
211b パッド
211c パッド
211d パッド
212 デバイス領域
213 リードフレーム
214 ボンディングワイヤ
215 プローバ
216 プローバ
217 ドライバ回路
218 トランジスタ群
219 抵抗
230p p型ウェル
230n n型ウェル
231 チャネル形成領域
232 低濃度不純物領域
233 高濃度不純物領域
234a ゲート絶縁層
234b ゲート絶縁層
235a ゲート電極
235b ゲート電極
236a ソース電極
236b ドレイン電極
236c ソース電極
236d ドレイン電極
237 導電性領域
238a サイドウォール絶縁物
238b サイドウォール絶縁物
239 素子分離絶縁物
240 トランジスタ
241 チャネル形成領域
242 低濃度不純物領域
243 高濃度不純物領域
247 導電性領域
250 トランジスタ
251 層間絶縁物
252 層間絶縁物
253 配線
254 層間絶縁物
255a 導電層
255b 導電層
256 絶縁物
260 トランジスタ
261 ゲート絶縁層
262a 第1の半導体層
262b 第2の半導体層
263a 絶縁層
263b 絶縁層
263c 絶縁層
264a 導電層
264b 導電層
265 層間絶縁物
266 しきい値補正用電極
300 基板
301 ALU
302 ROMインターフェース
303 ALUコントローラ
304 インストラクションデコーダ
305 インタラプトコントローラ
306 タイミングコントローラ
307 レジスタ
308 レジスタコントローラ
309 バスインターフェース
310 書き換え可能なROM
320 記憶素子
321 回路
322 回路
323 スイッチ
324 スイッチ
326 論理素子
327 容量素子
328 容量素子
329 トランジスタ
330 トランジスタ
333 トランジスタ
334 トランジスタ
335 回路
501 筐体
502 筐体
503 表示部
504 表示部
505 マイクロフォン
506 スピーカー
507 操作キー
508 スタイラス
511 筐体
512 筐体
513 表示部
514 表示部
515 接続部
516 操作キー
521 筐体
522 表示部
523 キーボード
524 ポインティングデバイス
531 筐体
532 冷蔵室用扉
533 冷凍室用扉
541 筐体
542 筐体
543 表示部
544 操作キー
545 レンズ
546 接続部
551 車体
552 車輪
553 ダッシュボード
554 ライト
Claims (11)
- 第1の半導体と、前記第1の半導体に電気的に接する電極と、
前記第1の半導体を間に挟んで設けられる第1のゲート電極と第2のゲート電極と、
前記第1のゲート電極と前記第1の半導体との間に設けられる電荷捕獲層と、
前記第2のゲート電極と前記第1の半導体との間に設けられるゲート絶縁層を有する半導体装置を形成する工程と、
前記第1のゲート電極の電位を、前記電極の電位より高い状態として、125℃以上450℃以下で1秒以上維持することにより前記電荷捕獲層に電荷を捕獲せしめる、しきい値適正化工程と、
前記しきい値適正化工程後に、前記第1のゲート電極を前記半導体装置から除去することを特徴とする半導体装置の作製方法。 - 請求項1において、前記電荷捕獲層は、酸化ハフニウム、酸化アルミニウム、アルミニウムシリケートのいずれか一を含むことを特徴とする半導体装置の作製方法。
- 前記電極が、ソース電極あるいはドレイン電極のいずれか一方である請求項1または2に記載の半導体装置の作製方法。
- 前記第1の半導体を挟む第2の半導体および第3の半導体を有し、前記第2の半導体は、前記第1の半導体と前記第2のゲート電極の間にあり、前記第3の半導体は、前記第1の半導体と前記ゲート絶縁層の間にある請求項1乃至3のいずれか一項に記載の半導体装置の作製方法。
- 前記しきい値適正化工程によって、前記電荷捕獲層が、負に帯電することを特徴とする請求項1乃至4のいずれか一項に記載の半導体装置の作製方法。
- 第1の半導体と、前記第1の半導体に電気的に接する電極と、
前記第1の半導体を間に挟んで設けられる第1のゲート電極と第2のゲート電極と、
前記第1のゲート電極と前記第1の半導体との間に設けられる電荷捕獲層と、
前記第2のゲート電極と前記第1の半導体との間に設けられるゲート絶縁層を有する半導体装置において、
前記第1のゲート電極と前記半導体装置の一端子の間に二端子素子が設けられ、前記第1のゲート電極と前記半導体装置の一端子の間に電流が流れることにより、前記第1のゲート電極と前記半導体装置の一端子の間に前記二端子素子に応じた電位差が生じることを特徴とする半導体装置。 - 第1の半導体と、前記第1の半導体に電気的に接する電極と、
前記第1の半導体を間に挟んで設けられる第1のゲート電極と第2のゲート電極と、
前記第1のゲート電極と前記第1の半導体との間に設けられる電荷捕獲層と、
前記第2のゲート電極と前記第1の半導体との間に設けられるゲート絶縁層を有する半導体装置において、
前記電荷捕獲層は、厚さが500nm以上であることを特徴とする半導体装置。 - 請求項6または7において、前記電荷捕獲層は、酸化ハフニウム、酸化アルミニウム、アルミニウムシリケートのいずれか一を含むことを特徴とする半導体装置。
- 前記電極が、ソース電極あるいはドレイン電極のいずれか一方である請求項6乃至8のいずれか一項に記載の半導体装置。
- 前記第1の半導体を挟む第2の半導体および第3の半導体を有し、前記第2の半導体は、前記第1の半導体と前記第2のゲート電極の間にあり、前記第3の半導体は、前記第1の半導体と前記ゲート絶縁層の間にある請求項6乃至9のいずれか一項に記載の半導体装置。
- 前記電荷捕獲層が、負に帯電していることを特徴とする請求項6乃至10のいずれか一項に記載の半導体装置。
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JP2020004982A (ja) * | 2015-08-31 | 2020-01-09 | 株式会社半導体エネルギー研究所 | 半導体装置の作製方法 |
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JP2017143239A (ja) * | 2015-08-04 | 2017-08-17 | 株式会社半導体エネルギー研究所 | 半導体装置、および半導体装置の作成方法 |
US11217668B2 (en) | 2015-08-04 | 2022-01-04 | Semiconductor Energy Laboratory Co., Ltd. | Semiconductor device and manufacturing method thereof |
JP2020004982A (ja) * | 2015-08-31 | 2020-01-09 | 株式会社半導体エネルギー研究所 | 半導体装置の作製方法 |
JP2021036598A (ja) * | 2015-08-31 | 2021-03-04 | 株式会社半導体エネルギー研究所 | 表示装置の作製方法 |
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