JP6142300B2 - 薄膜トランジスタの製造方法 - Google Patents
薄膜トランジスタの製造方法 Download PDFInfo
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- JP6142300B2 JP6142300B2 JP2015551370A JP2015551370A JP6142300B2 JP 6142300 B2 JP6142300 B2 JP 6142300B2 JP 2015551370 A JP2015551370 A JP 2015551370A JP 2015551370 A JP2015551370 A JP 2015551370A JP 6142300 B2 JP6142300 B2 JP 6142300B2
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- oxide semiconductor
- silicon
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- thin film
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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
- H01L29/78606—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
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- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
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- H01L21/02107—Forming insulating materials on a substrate
- H01L21/02109—Forming insulating materials on a substrate characterised by the type of layer, e.g. type of material, porous/non-porous, pre-cursors, mixtures or laminates
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- H01L21/02164—Forming insulating materials on a substrate characterised by the type of layer, e.g. type of material, porous/non-porous, pre-cursors, mixtures or laminates characterised by the material of the layer the material containing silicon the material being a silicon oxide, e.g. SiO2
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- H01L21/02225—Forming insulating materials on a substrate characterised by the process for the formation of the insulating layer
- H01L21/02227—Forming insulating materials on a substrate characterised by the process for the formation of the insulating layer formation by a process other than a deposition process
- H01L21/02252—Forming insulating materials on a substrate characterised by the process for the formation of the insulating layer formation by a process other than a deposition process formation by plasma treatment, e.g. plasma oxidation of the substrate
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- H01L21/18—Manufacture or treatment of semiconductor devices or of parts thereof the devices having at least one potential-jump barrier or surface barrier, e.g. PN junction, depletion layer or carrier concentration layer the devices having semiconductor bodies comprising elements of Group IV of the Periodic System or AIIIBV compounds with or without impurities, e.g. doping materials
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- H01L21/31—Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/26 to form insulating layers thereon, e.g. for masking or by using photolithographic techniques; After treatment of these layers; Selection of materials for these layers
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- H01L27/12—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components specially adapted for rectifying, oscillating, amplifying or switching and having at least one potential-jump barrier or surface barrier; including integrated passive circuit elements with at least one potential-jump barrier or surface barrier the substrate being other than a semiconductor body, e.g. an insulating body
- H01L27/1214—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components specially adapted for rectifying, oscillating, amplifying or switching and having at least one potential-jump barrier or surface barrier; including integrated passive circuit elements with at least one potential-jump barrier or surface barrier the substrate being other than a semiconductor body, e.g. an insulating body comprising a plurality of TFTs formed on a non-semiconducting substrate, e.g. driving circuits for AMLCDs
- H01L27/1255—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components specially adapted for rectifying, oscillating, amplifying or switching and having at least one potential-jump barrier or surface barrier; including integrated passive circuit elements with at least one potential-jump barrier or surface barrier the substrate being other than a semiconductor body, e.g. an insulating body comprising a plurality of TFTs formed on a non-semiconducting substrate, e.g. driving circuits for AMLCDs integrated with passive devices, e.g. auxiliary capacitors
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- H01L29/02—Semiconductor bodies ; Multistep manufacturing processes therefor
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- H01L29/24—Semiconductor bodies ; Multistep manufacturing processes therefor characterised by the materials of which they are formed including, apart from doping materials or other impurities, only semiconductor materials not provided for in groups H01L29/16, H01L29/18, H01L29/20, H01L29/22
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- H01L29/76—Unipolar devices, e.g. field effect transistors
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- H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
- H10K59/10—OLED displays
- H10K59/12—Active-matrix OLED [AMOLED] displays
- H10K59/121—Active-matrix OLED [AMOLED] displays characterised by the geometry or disposition of pixel elements
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Description
本開示に係る薄膜トランジスタの製造方法は、基板の上方に酸化物半導体膜を形成する工程と、酸化物半導体膜上にシリコン膜を形成する工程と、シリコン膜をプラズマ酸化することで、(i)シリコン酸化膜を形成し、かつ、(ii)酸化物半導体膜に酸素を供給する工程とを含む。
[有機EL表示装置]
まず、本実施の形態に係る有機EL表示装置10の構成について、図1を用いて説明する。図1は、本実施の形態に係る有機EL表示装置の一部切り欠き斜視図である。
以下では、本実施の形態に係る薄膜トランジスタについて、図3を用いて説明する。なお、本実施の形態に係る薄膜トランジスタは、ボトムゲート型、かつ、チャネル保護型の薄膜トランジスタである。
続いて、本実施の形態に係る薄膜トランジスタの製造方法について、図4A〜図4Cを用いて説明する。図4A〜図4Cは、本実施の形態に係る薄膜トランジスタ100の製造方法を示す概略断面図である。
以上のように、本実施の形態に係る薄膜トランジスタの製造方法は、基板110の上方に酸化物半導体膜141を形成する工程と、酸化物半導体膜141上にシリコン膜151を形成する工程と、シリコン膜151をプラズマ酸化することで、(i)シリコン酸化膜152を形成し、かつ、(ii)酸化物半導体膜141に酸素を供給する工程とを含む。
次に、実施の形態2について説明する。なお、本実施の形態に係る有機EL表示装置の構成は、実施の形態1に係る有機EL表示装置10の構成と同様であるので、その説明は省略し、薄膜トランジスタについて説明する。
以下では、本実施の形態に係る薄膜トランジスタについて説明する。なお、本実施の形態に係る薄膜トランジスタは、トップゲート型の薄膜トランジスタである。
続いて、本実施の形態に係る薄膜トランジスタの製造方法について、図7A〜図7Cを用いて説明する。図7A〜図7Cは、本実施の形態に係る薄膜トランジスタ300の製造方法を示す概略断面図である。
以上のように、本実施の形態に係る薄膜トランジスタの製造方法は、基板310の上方に酸化物半導体膜341を形成する工程と、酸化物半導体膜341上にシリコン膜351を形成する工程と、シリコン膜351をプラズマ酸化することで、(i)シリコン酸化膜352を形成し、かつ、(ii)酸化物半導体膜341に酸素を供給する工程とを含む。
以上のように、本出願において開示する技術の例示として、実施の形態1及び2を説明した。しかしながら、本開示における技術は、これらに限定されず、適宜、変更、置き換え、付加、省略などを行った実施の形態にも適用可能である。
20 TFT基板
30 画素
31 画素回路
32、33、100、300 薄膜トランジスタ
32d、33d、170d、370d ドレイン電極
32g、33g、120、320 ゲート電極
32s、33s、170s、370s ソース電極
34 キャパシタ
40 有機EL素子
41 陽極
42 EL層
43 陰極
50 ゲート配線
60 ソース配線
70 電源配線
110、310 基板
130、330 ゲート絶縁層
140、340 酸化物半導体層
141、341 酸化物半導体膜
150、153、154、350、353、354 酸化シリコン層
151、351 シリコン膜
152、352 シリコン酸化膜
160 チャネル保護層
161 チャネル保護膜
171、321、371 金属膜
180、181、380、381 レジスト
200 成膜装置
210、211 成膜チャンバー
220 真空搬送チャンバー
230、231、232、233 ゲートバルブ
331 ゲート絶縁膜
360 絶縁層
361 絶縁膜
Claims (9)
- 基板の上方に酸化物半導体膜を形成する工程と、
前記酸化物半導体膜上に、厚さが5nm以下のシリコン膜を形成する工程と、
前記シリコン膜をプラズマ酸化することで、(i)シリコン酸化膜を形成し、かつ、(ii)前記酸化物半導体膜に酸素を供給する工程と、
前記プラズマ酸化する工程の後に、前記シリコン酸化膜上に絶縁膜を形成する工程と、
前記絶縁膜の上方にゲート電極、ドレイン電極又はソース電極を形成する工程とを含む
薄膜トランジスタの製造方法。 - 前記シリコン膜を形成する工程では、スパッタリングによって前記シリコン膜を形成する
請求項1に記載の薄膜トランジスタの製造方法。 - 前記酸化物半導体膜を形成する工程及び前記シリコン膜を形成する工程では、同一真空系内で、前記酸化物半導体膜と前記シリコン膜とを形成する
請求項1又は2に記載の薄膜トランジスタの製造方法。 - 前記シリコン膜の厚さは、2nm以上である
請求項1〜3のいずれか1項に記載の薄膜トランジスタの製造方法。 - 前記プラズマ酸化する工程では、表面波プラズマ、又は、励起周波数が27MHz以上の容量結合プラズマによって、前記シリコン膜をプラズマ酸化する
請求項1〜4のいずれか1項に記載の薄膜トランジスタの製造方法。 - 前記薄膜トランジスタの製造方法は、さらに、
前記シリコン酸化膜上に、パターニングされたレジストを形成する工程と、
前記レジストをマスクとして用いて前記シリコン酸化膜をドライエッチングすることで、パターニングされた酸化シリコン層を形成する工程と、
前記レジスト及び前記酸化シリコン層をマスクとして用いて前記酸化物半導体膜をウェットエッチングする工程と、
アッシングにより前記レジストの端部を後退させる工程と、
端部が後退した前記レジストをマスクとして用いて前記酸化シリコン層をドライエッチングする工程とを含む
請求項1〜5のいずれか1項に記載の薄膜トランジスタの製造方法。 - 前記酸化物半導体膜は、透明アモルファス酸化物半導体である
請求項1〜6のいずれか1項に記載の薄膜トランジスタの製造方法。 - 前記酸化物半導体膜は、InGaZnOである
請求項1〜7のいずれか1項に記載の薄膜トランジスタの製造方法。 - 基板の上方に酸化物半導体膜を形成する工程と、
前記酸化物半導体膜上にシリコン膜を形成する工程と、
前記シリコン膜をプラズマ酸化することで、(i)シリコン酸化膜を形成し、かつ、(ii)前記酸化物半導体膜に酸素を供給する工程と、
前記シリコン酸化膜上に、パターニングされたレジストを形成する工程と、
前記レジストをマスクとして用いて前記シリコン酸化膜をドライエッチングすることで、パターニングされた酸化シリコン層を形成する工程と、
前記レジスト及び前記酸化シリコン層をマスクとして用いて前記酸化物半導体膜をウェットエッチングする工程と、
アッシングにより前記レジストの端部を後退させる工程と、
端部が後退した前記レジストをマスクとして用いて前記酸化シリコン層をドライエッチングする工程とを含む
薄膜トランジスタの製造方法。
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