JP5765922B2 - 半導体装置 - Google Patents
半導体装置 Download PDFInfo
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- JP5765922B2 JP5765922B2 JP2010268653A JP2010268653A JP5765922B2 JP 5765922 B2 JP5765922 B2 JP 5765922B2 JP 2010268653 A JP2010268653 A JP 2010268653A JP 2010268653 A JP2010268653 A JP 2010268653A JP 5765922 B2 JP5765922 B2 JP 5765922B2
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- MZLGASXMSKOWSE-UHFFFAOYSA-N tantalum nitride Chemical compound [Ta]#N MZLGASXMSKOWSE-UHFFFAOYSA-N 0.000 description 1
- 229910001936 tantalum oxide Inorganic materials 0.000 description 1
- JBQYATWDVHIOAR-UHFFFAOYSA-N tellanylidenegermanium Chemical compound [Te]=[Ge] JBQYATWDVHIOAR-UHFFFAOYSA-N 0.000 description 1
- TXEYQDLBPFQVAA-UHFFFAOYSA-N tetrafluoromethane Chemical compound FC(F)(F)F TXEYQDLBPFQVAA-UHFFFAOYSA-N 0.000 description 1
- 229920001187 thermosetting polymer Polymers 0.000 description 1
- XOLBLPGZBRYERU-UHFFFAOYSA-N tin dioxide Chemical compound O=[Sn]=O XOLBLPGZBRYERU-UHFFFAOYSA-N 0.000 description 1
- 229910001887 tin oxide Inorganic materials 0.000 description 1
- 238000002834 transmittance Methods 0.000 description 1
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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
-
- 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
- H01L29/42384—Gate electrodes for field effect devices for field-effect transistors with insulated gate for thin film field effect transistors, e.g. characterised by the thickness or the shape of the insulator or the dimensions, the shape or the lay-out of the conductor
-
- 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
- H01L29/43—Electrodes ; Multistep manufacturing processes therefor characterised by the materials of which they are formed
- H01L29/45—Ohmic electrodes
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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
- H01L29/78696—Thin film transistors, i.e. transistors with a channel being at least partly a thin film characterised by the structure of the channel, e.g. multichannel, transverse or longitudinal shape, length or width, doping structure, or the overlap or alignment between the channel and the gate, the source or the drain, or the contacting structure of the channel
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- Engineering & Computer Science (AREA)
- Microelectronics & Electronic Packaging (AREA)
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- Ceramic Engineering (AREA)
- Condensed Matter Physics & Semiconductors (AREA)
- General Physics & Mathematics (AREA)
- Computer Hardware Design (AREA)
- Thin Film Transistor (AREA)
- Liquid Crystal (AREA)
- Electroluminescent Light Sources (AREA)
Description
本実施の形態では、チャネルエッチ構造のボトムゲート型のトランジスタを例に挙げ、本発明の一態様に係るトランジスタの構造について説明する。
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ないことを付記する。
酸化物半導体との比較対象たり得る半導体材料としては、炭化珪素(例えば、4H−SiC)がある。酸化物半導体と4H−SiCはいくつかの共通点を有している。キャリア密度はその一例である。フェルミ・ディラック分布に従えば、酸化物半導体の少数キャリアは10−7/cm3程度と見積もられるが、これは、4H−SiCにおける6.7×10−11/cm3と同様、極めて低い値である。シリコンの真性キャリア密度(1.4×1010/cm3程度)と比較すれば、その程度が並はずれていることが良く理解できる。
続いて、本実施の形態で作製方法を示すトランジスタに対してオフ電流の温度特性を評価する。温度特性は、トランジスタが使われる最終製品の耐環境性や、性能の維持などを考慮する上で重要である。当然ながら、変化量が小さいほど好ましく、製品設計の自由度が増す。
次いで、本実施の形態で作製方法を示すトランジスタのオン電流(Ion)の温度依存性により求めた活性化エネルギーを評価する。活性化エネルギーは、アレニウスプロットにより算出することが知られている。
TFT−1として、チャネル長Lが3μm、チャネル幅Wが24μmのチャネルエッチ構造のボトムゲート型トランジスタを作製した。
TFT−2として、チャネル長Lが3μm、チャネル幅Wが50μmのチャネルエッチ構造のボトムゲート型トランジスタを作製した。
比較TFT−3として、チャネル長Lが3.7μm、チャネル幅Wが22μmのチャネルエッチ構造のボトムゲート型トランジスタを作製した。
次いで、図1に示したボトムゲート型のトランジスタを例に挙げ、半導体装置のさらに詳しい構成及び作製方法について図2を用いて説明する。
実施の形態1に示すトランジスタを作製し、該トランジスタを画素部、さらには駆動回路に用いて表示機能を有する半導体装置(表示装置ともいう)を作製することができる。また、実施の形態1に示すトランジスタを駆動回路の一部または全体を、画素部と同じ基板上に一体形成し、システムオンパネルを形成することができる。
本実施の形態では、実施の形態1に示すトランジスタを適用した半導体装置として電子ペーパーの例を示す。
本実施の形態では、実施の形態1に示すトランジスタを適用した半導体装置として発光表示装置の例を示す。表示装置の有する表示素子としては、ここではエレクトロルミネッセンスを利用する発光素子を用いて示す。エレクトロルミネッセンスを利用する発光素子は、発光材料が有機化合物であるか、無機化合物であるかによって区別され、一般的に、前者は有機EL素子、後者は無機EL素子と呼ばれている。
実施の形態1に示すトランジスタを適用した半導体装置は、電子ペーパーとして適用することができる。電子ペーパーは、情報を表示するものであればあらゆる分野の電子機器に用いることが可能である。例えば、電子ペーパーを用いて、電子書籍(電子ブック)、ポスター、電車などの乗り物の車内広告、クレジットカード等の各種カードにおける表示等に適用することができる。電子機器の一例を図17、図18に示す。
実施の形態1に示すトランジスタを用いた半導体装置は、さまざまな電子機器(遊技機も含む)に適用することができる。電子機器としては、例えば、テレビジョン装置(テレビ、またはテレビジョン受信機ともいう)、コンピュータ用などのモニタ、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(携帯電話、携帯電話装置ともいう)、携帯型ゲーム機、携帯情報端末、音響再生装置、パチンコ機などの大型ゲーム機などが挙げられる。
101 ゲート電極
102 ゲート絶縁膜
103 酸化物半導体膜
104 酸化物半導体膜
105 導電膜
106 ソース電極
107 ドレイン電極
108 酸化物半導体膜
109 絶縁膜
110 薄膜トランジスタ
111 バックゲート電極
113 チャネル保護層
160 薄膜トランジスタ
170 薄膜トランジスタ
180 薄膜トランジスタ
Claims (4)
- ゲート電極、ゲート絶縁膜、酸化物半導体膜、ソース電極、及びドレイン電極を有するトランジスタを有し、
前記酸化物半導体膜は、Inと、Gaと、Znと、を有し、
前記ゲート電極にしきい値電圧以上の電圧を印加した際の、前記ソース電極及び前記ドレイン電極間の電流の温度依存性より求めた前記酸化物半導体膜の活性化エネルギーは、0meV以上25meV以下であることを特徴とする半導体装置。 - ゲート電極、ゲート絶縁膜、酸化物半導体膜、ソース電極、及びドレイン電極を有するトランジスタを有し、
前記酸化物半導体膜は、Inと、Gaと、Znと、を有し、
前記酸化物半導体膜は、結晶性を有する領域を有し、
前記ゲート電極にしきい値電圧以上の電圧を印加した際の、前記ソース電極及び前記ドレイン電極間の電流の温度依存性より求めた前記酸化物半導体膜の活性化エネルギーは、0meV以上25meV以下であることを特徴とする半導体装置。 - 請求項1又は2において、
前記ゲート絶縁膜の膜厚は、10nm以上500nm以下であることを特徴とする半導体装置。 - 請求項1乃至3のいずれか一において、
前記酸化物半導体膜の膜厚は、10nm以上300nm以下であることを特徴とする半導体装置。
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US8470649B2 (en) | 2013-06-25 |
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US20130277671A1 (en) | 2013-10-24 |
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