JP2012074692A - 電界効果トランジスタおよび半導体装置の作製方法 - Google Patents
電界効果トランジスタおよび半導体装置の作製方法 Download PDFInfo
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- JP2012074692A JP2012074692A JP2011192413A JP2011192413A JP2012074692A JP 2012074692 A JP2012074692 A JP 2012074692A JP 2011192413 A JP2011192413 A JP 2011192413A JP 2011192413 A JP2011192413 A JP 2011192413A JP 2012074692 A JP2012074692 A JP 2012074692A
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- H01L29/00—Semiconductor devices specially adapted for rectifying, amplifying, oscillating or switching and having potential barriers; Capacitors or resistors having potential barriers, e.g. a PN-junction depletion layer or carrier concentration layer; Details of semiconductor bodies or of electrodes thereof ; Multistep manufacturing processes therefor
- H01L29/02—Semiconductor bodies ; Multistep manufacturing processes therefor
- H01L29/06—Semiconductor bodies ; Multistep manufacturing processes therefor characterised by their shape; characterised by the shapes, relative sizes, or dispositions of the semiconductor regions ; characterised by the concentration or distribution of impurities within semiconductor regions
- H01L29/08—Semiconductor bodies ; Multistep manufacturing processes therefor characterised by their shape; characterised by the shapes, relative sizes, or dispositions of the semiconductor regions ; characterised by the concentration or distribution of impurities within semiconductor regions with semiconductor regions connected to an electrode carrying current to be rectified, amplified or switched and such electrode being part of a semiconductor device which comprises three or more electrodes
- H01L29/0843—Source or drain regions of field-effect devices
- H01L29/0847—Source or drain regions of field-effect devices of field-effect transistors with insulated gate
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L29/00—Semiconductor devices specially adapted for rectifying, amplifying, oscillating or switching and having potential barriers; Capacitors or resistors having potential barriers, e.g. a PN-junction depletion layer or carrier concentration layer; Details of semiconductor bodies or of electrodes thereof ; Multistep manufacturing processes therefor
- H01L29/40—Electrodes ; Multistep manufacturing processes therefor
- H01L29/41—Electrodes ; Multistep manufacturing processes therefor characterised by their shape, relative sizes or dispositions
- H01L29/423—Electrodes ; Multistep manufacturing processes therefor characterised by their shape, relative sizes or dispositions not carrying the current to be rectified, amplified or switched
- H01L29/42312—Gate electrodes for field effect devices
- H01L29/42316—Gate electrodes for field effect devices for field-effect transistors
- H01L29/4232—Gate electrodes for field effect devices for field-effect transistors with insulated gate
- H01L29/42324—Gate electrodes for transistors with a floating gate
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L29/00—Semiconductor devices specially adapted for rectifying, amplifying, oscillating or switching and having potential barriers; Capacitors or resistors having potential barriers, e.g. a PN-junction depletion layer or carrier concentration layer; Details of semiconductor bodies or of electrodes thereof ; Multistep manufacturing processes therefor
- H01L29/66—Types of semiconductor device ; Multistep manufacturing processes therefor
- H01L29/66007—Multistep manufacturing processes
- H01L29/66015—Multistep manufacturing processes of devices having a semiconductor body comprising semiconducting carbon, e.g. diamond, diamond-like carbon, graphene
- H01L29/66037—Multistep manufacturing processes of devices having a semiconductor body comprising semiconducting carbon, e.g. diamond, diamond-like carbon, graphene the devices being controllable only by the electric current supplied or the electric potential applied, to an electrode which does not carry the current to be rectified, amplified or switched, e.g. three-terminal devices
- H01L29/66045—Field-effect transistors
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L29/00—Semiconductor devices specially adapted for rectifying, amplifying, oscillating or switching and having potential barriers; Capacitors or resistors having potential barriers, e.g. a PN-junction depletion layer or carrier concentration layer; Details of semiconductor bodies or of electrodes thereof ; Multistep manufacturing processes therefor
- 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
- H01L29/78606—Thin film transistors, i.e. transistors with a channel being at least partly a thin film with supplementary region or layer in the thin film or in the insulated bulk substrate supporting it for controlling or increasing the safety of the device
- H01L29/78633—Thin film transistors, i.e. transistors with a channel being at least partly a thin film with supplementary region or layer in the thin film or in the insulated bulk substrate supporting it for controlling or increasing the safety of the device with a light shield
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L29/00—Semiconductor devices specially adapted for rectifying, amplifying, oscillating or switching and having potential barriers; Capacitors or resistors having potential barriers, e.g. a PN-junction depletion layer or carrier concentration layer; Details of semiconductor bodies or of electrodes thereof ; Multistep manufacturing processes therefor
- 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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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
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Abstract
【解決手段】半導体層101とゲート105の間に、絶縁物104により周囲を覆われた導体もしくは半導体よりなり、半導体層101を横切るように形成されたフローティング電極102を形成し、これを帯電させることにより、ソース電極103aやドレイン電極103bからのキャリアの流入を防止する。このため半導体層101中のキャリア濃度を十分に低く維持でき、よって、ゼロ電流を低減できる。
【選択図】図1
Description
(a―A)2+(b―B)2+(c―C)2≦r2
を満たすことを言い、rは、例えば、0.05とすればよい。他の酸化物でも同様である。
本実施の形態を図4乃至図6を用いて説明する。まず、基板201上に、導体膜と絶縁膜、導体膜を形成し、これを選択的にエッチングして、図4(A)に示すように、ゲート202、第1のゲート絶縁膜203、フローティング電極204を形成する。基板201としては、様々なものが用いられるが、その後の処理に耐えられる物性を有していることが必要である。また、その表面は絶縁性であることが好ましい。すなわち、基板201は絶縁体単独、あるいは絶縁体や導体や半導体の表面に絶縁層を形成したもの等であることが好ましい。
本実施の形態では、シリコンによるFET上に別の半導体層を有し、かつ、フローティング電極を有するFETを形成する半導体回路の作製方法について図7(A)乃至(D)を用いて説明する。まず、公知のシリコンMOSFET作製技術により、シリコン基板301に、素子分離領域302を形成し、ゲート絶縁膜303、ゲート304、ソース306a、およびドレイン306bを有するシリコンFETを形成する。ゲート304には、図に示すようなサイドウォールを設けてもよい。また、ゲート304は素子分離領域上にも延在する。さらに、ソース306a、およびドレイン306bの表面には、導電性を高めるためのシリサイド層305a、305bを設けてもよい(図7(A)参照)。
実施の形態1あるいは2ではFETの作製方法について説明したが、本実施の形態では、フローティング電極に電荷を蓄積する方法について図9を用いて説明する。本実施の形態では、図8(A)に示されるようなメモリ素子に電荷を蓄積する方法について説明する。なお、メモリ素子のRTr(n,m)、WTr(n,m)、C(n,m)は、それぞれ、図8(A)のFET316、FET317、容量素子318に相当する。
まず、メモリ素子を含む半導体回路が完成したら、メモリ素子の初期特性を測定する。この段階では、WTr(n,m)のフローティング電極は帯電していない。ここで、メモリ素子として機能するかどうかを判定し、かつ、メモリ素子の特性を記録する。
この段階では、WTr(n,m)のフローティング電極に電荷を蓄積する。WTr(n,m)のフローティング電極に蓄積する電荷の量は、WTr(n,m)のゲートとソース電極(あるいはドレイン電極)の電位差で制御できる。具体的には、書き込みワード線Qnとビット線Rmとの間の電位差を制御することで、メモリ素子のWTr(n,m)のフローティング電極に蓄積される電荷を制御できる。先の測定結果をもとに、メモリ素子のWTr(n,m)のフローティング電極に適切な量の電荷を蓄積する。なお、電荷の蓄積には十分な時間をかけておこなうことができ、そのため、蓄積される電荷量の誤差を十分に小さくできる。
この段階で再度、メモリ素子の特性を測定する。ここで、必要な量のメモリ素子で十分な特性が得られていれば、半導体回路を樹脂等で封止し、パッケージ化する。しかしながら、必要な量のメモリ素子で十分な特性が得られていない場合には、この測定データを元に再度、フローティング電極に適切な量の電荷を蓄積する工程へ戻る。
上記実施の形態1乃至実施の形態3で示した半導体装置は、半導体メモリをはじめ、さまざまな電子機器に用いることができる。例えば、テレビジョン、パーソナルコンピュータ、携帯電話等の通信機器、電子手帳、携帯音楽プレーヤ等である。
102 フローティング電極
103a ソース電極
103b ドレイン電極
104 絶縁物
105 ゲート
111 ID−VG曲線
112 ID−VG曲線
113 ID−VG曲線
114 ID−VG曲線
115 ID−VG曲線
116 ID−VG曲線
201 基板
202 ゲート
203 第1のゲート絶縁膜
204 フローティング電極
204a フローティング電極
205 絶縁物
205a 絶縁物
206 第2のゲート絶縁膜
206a 第2のゲート絶縁膜
207 半導体層
207a 半導体層
208 保護絶縁層
208a 保護絶縁層
209 層間絶縁物
210a コンタクトホール
210b コンタクトホール
211a ソース電極
211b ドレイン電極
301 基板
302 素子分離領域
303 ゲート絶縁膜
304 ゲート
305a シリサイド層
305b シリサイド層
306a ソース
306b ドレイン
307 絶縁物
308 半導体層
309a 第1の電極
309b 第2の電極
310 第1のゲート絶縁層
311 フローティング電極
312 第2のゲート絶縁層
313a 配線
313b 配線
314 層間絶縁物
315 コンタクトプラグ
316 FET
317 FET
317a FET
318 容量素子
318a 容量素子
Claims (8)
- 半導体層と、半導体層の第1の面に接して設けられた第1および第2の導体電極と、半導体層の第1の面あるいは第2の面に設けられたゲートとを有する電界効果トランジスタにおいて、半導体層とゲートとの間に、絶縁物に周囲を覆われた導体もしくは半導体よりなり、所定の電荷により帯電したフローティング電極を有し、フローティング電極は、半導体層を横切るように設けられ、かつ、電界効果トランジスタにはPN接合が存在しないことを特徴とする電界効果トランジスタ。
- 半導体層と、半導体層の第1の面に接して設けられた第1および第2の導体電極と、半導体層の第1の面あるいは第2の面に設けられたゲートとを有する電界効果トランジスタにおいて、半導体層とゲートとの間に、絶縁物に周囲を覆われた導体もしくは半導体よりなり、所定の電荷により帯電したフローティング電極を有し、フローティング電極は、半導体層を横切るように設けられ、かつ、第1および第2の導体電極と半導体層との間には導体半導体接合が存在することを特徴とする電界効果トランジスタ。
- 半導体層は、インジウムと亜鉛の全金属元素に占める比率が少なくとも25%以上である酸化物であることを特徴とする請求項1あるいは請求項2記載の電界効果トランジスタ。
- 半導体層は、バンドギャップが3.0eV以上4.5eV以下である酸化物であることを特徴とする請求項1乃至請求項3記載の電界効果トランジスタ。
- 半導体層が第1のドーピング領域と第2のドーピング領域を有し、第1のドーピング領域と第2のドーピング領域のそれぞれは半導体層の他の領域よりもキャリアを高濃度に含み、第1のドーピング領域は第1の導体電極に接し、第2のドーピング領域は第2の導体電極に接することを特徴とする請求項1乃至4記載の電界効果トランジスタ。
- 第1のドーピング領域と第2のドーピング領域のキャリア濃度は、1×1018/cm3以上1×1021/cm3未満である請求項5に記載の電界効果トランジスタ。
- 半導体層と、半導体層の第1の面に接して設けられた第1および第2の導体電極と、半導体層第1の面あるいは第2の面に設けられたゲートとを有し、半導体層とゲートとの間に、絶縁物に周囲を覆われた導体もしくは半導体よりなるフローティング電極を有し、フローティング電極は、半導体層を横切るように設けられた電界効果トランジスタを有する半導体回路を作製する工程と、フローティング電極を帯電させる工程と、その後、遮光性の材料で半導体回路を覆う工程とを有する半導体装置の作製方法。
- 半導体層と、半導体層の第1の面に接して設けられた第1および第2の導体電極と、半導体層の第1の面あるいは第2の面に設けられたゲートとを有し、半導体層とゲートとの間に、絶縁物に周囲を覆われた導体もしくは半導体よりなるフローティング電極を有し、フローティング電極は、半導体層を横切るように設けられた電界効果トランジスタとパッドを有する半導体回路を作製する工程と、パッドを通して、ゲートと第1または第2の導体電極に電圧を印加することにより、フローティング電極を帯電させる工程とを有する半導体装置の作製方法。
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US9425199B2 (en) | 2016-08-23 |
TW201624720A (zh) | 2016-07-01 |
TWI599046B (zh) | 2017-09-11 |
US20120056175A1 (en) | 2012-03-08 |
JP6224157B2 (ja) | 2017-11-01 |
JP5921838B2 (ja) | 2016-05-24 |
KR20180105252A (ko) | 2018-09-27 |
KR20180015760A (ko) | 2018-02-13 |
WO2012029674A1 (en) | 2012-03-08 |
KR20130102581A (ko) | 2013-09-17 |
TW201214710A (en) | 2012-04-01 |
TWI582992B (zh) | 2017-05-11 |
JP2016131258A (ja) | 2016-07-21 |
US9331210B2 (en) | 2016-05-03 |
US20160190139A1 (en) | 2016-06-30 |
US20160329407A1 (en) | 2016-11-10 |
US9704960B2 (en) | 2017-07-11 |
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