JP2006165527A - 電界効果型トランジスタ - Google Patents
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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
- H01L29/66—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
- H01L29/78693—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 the semiconducting oxide being amorphous
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Abstract
【解決手段】ソース電極708、ドレイン電極709、ゲート電極712、及び電子キャリア濃度が1018/cm3未満である非晶質酸化物を含む活性層を備え、且つ該ゲート電極と、該ソース及びドレイン電極が自己整合していることを特徴とする。
【選択図】図7
Description
ソース電極、ドレイン電極、ゲート電極、及び
電子キャリア濃度が1018/cm3未満である非晶質酸化物を含む活性層を備え、且つ
該ゲート電極と、該ソース及びドレイン電極とが自己整合していることを特徴とする。
ソース電極、ドレイン電極、ゲート電極、及び
電子キャリア濃度が増加すると共に、電子移動度が増加する傾向を示す非晶質酸化物を含む活性層を備え、且つ
該ゲート電極と、該ソース及びドレイン電極とが自己整合していることを特徴とする。
ソース電極、ドレイン電極、ゲート電極、及び
非晶質酸化物を含む活性層を備え、
該ゲート電極と、該ソース及びドレイン電極とが自己整合しており、且つノーマリーオフ型であることを特徴とする。
(非晶質酸化物)
本発明に係る非晶質酸化物の電子キャリア濃度は、室温で測定する場合の値である。室温とは、例えば25℃であり、具体的には0℃から40℃程度の範囲から適宜選択されるある温度である。なお、本発明に係るアモルファス酸化物の電子キャリア濃度は、0℃から40℃の範囲全てにおいて、1018/cm3未満を充足する必要はない。例えば、25℃において、キャリア電子密度1018/cm3未満が実現されていればよい。また、電子キャリア濃度を更に下げ、1017/cm3以下、より好ましくは1016/cm3以下にするとノーマリーオフのTFTが歩留まり良く得られる。
(第1の成膜法:PLD法)
結晶状態における組成がInGaO3(ZnO)m(mは6未満の自然数)で表される非晶質酸化物薄膜は、mの値が6未満の場合は、800℃以上の高温まで、非晶質状態が安定に保たれるが、mの値が大きくなるにつれ、結晶化しやすくなる。すなわち、InGaO3に対するZnOの比が増大して、ZnO組成に近づくにつれ、結晶化しやすくなる。したがって、非晶質TFTのチャネル層としては、mの値が6未満であることが好ましい。
図6に、室温下で測定したMISFET素子の電流−電圧特性を示す。ドレイン電圧VDSの増加に伴い、ドレイン電流IDSが増加したことからチャネルがn型半導体であることが分かる。これは、アモルファスIn-Ga-Zn-O系半導体がn型であるという事実と矛盾しない。IDSはVDS= 6 V程度で飽和(ピンチオフ)する典型的な半導体トランジスタの挙動を示した。利得特性を調べたところ、VDS = 4 V印加時におけるゲート電圧VGSの閾値は約-0.5 Vであった。また、VG=10 V時には、IDS=1.0 × 10-5Aの電流が流れた。これはゲートバイアスにより絶縁体のIn-Ga-Zn-O系アモルファス半導体薄膜内にキャリアを誘起できたことに対応する。
また、本実施例で得られたアモルファス酸化物は、可視光の光吸収が殆どなく、透明なフレキシブルTFTを実現できる。
(第2の成膜法:スパッタ法(SP法))
雰囲気ガスとしてアルゴンガスを用いた高周波SP法により、成膜する場合について説明する。
さらに、組成系を拡大して研究を進めた結果、Zn,In及びSnのうち、少なくとも1種類の元素の酸化物からなるアモルファス酸化物で、電子キャリア濃度が小さく、かつ電子移動度が大きいアモルファス酸化物膜を作製できることを見出した。
(a) 室温での電子キャリア濃度が、1018/cm3未満のアモルファス酸化物。
(b) 電子キャリア濃度が増加すると共に、電子移動度が増加することを特徴とするアモルファス酸化物。
(c) 室温での電子移動度が、0.1cm2/V・秒超であることを特徴とする上記(a)又は(b)に記載されるアモルファス酸化物。
(d) 縮退伝導を示す上記(b)から(c)のいずれかに記載されるアモルファス酸化物である。なお、ここでの縮退伝導とは、電気抵抗の温度依存性における熱活性化エネルギーが、30meV以下の状態をいう。
(e) Zn, In及びSnのうち、少なくとも1種類の元素を構成成分として含む上記(a)から(d)のいずれかに記載されるアモルファス酸化物。
(f) 上記(e)に記載のアモルファス酸化物に、Znより原子番号の小さい2族元素M2(M2は、Mg,Ca)、Inより原子番号の小さい3属元素M3(M3は、B,Al、Ga、Y),Snより小さい原子番号の小さい4属元素M4(M4は、Si,Ge,Zr)、5属元素M5(M5は、V,Nb,Ta)およびLu、Wのうち、少なくとも1種類の元素を含むアモルファス酸化物膜。
(g) 結晶状態における組成がIn1−xM3xO3(Zn1−yM2yO)m(0≦x、y≦1、mは0又は6未満の自然数)である化合物単体又はmの異なる化合物の混合体である(a)から(f)のいずれかに記載のアモルファス酸化物膜。M3たとえば、Gaであり、M2は例えば、Mgである。
(h) ガラス基板、金属基板、プラスチック基板又はプラスチックフィルム上に設けた上記(a)から(g)記載のアモルファス酸化物膜。
(PLD法によるIn−Zn−Ga−O系アモルファス酸化膜の成膜)
KrFエキシマレーザーを用いたPLD法により、ガラス基板(コーニング社製1737)上にIn−Zn―Ga―O系アモルファス酸化物膜を堆積させた。このとき、InGaO3(ZnO)及びInGaO3(ZnO)4組成を有する多結晶焼結体をそれぞれターゲットとした。
(PLD法によるIn−Zn−Ga−Mg−O系アモルファス酸化物膜の成膜)
ターゲットとして多結晶InGaO3 (Zn1-xMgxO)4(0<x≦1)を用い、PLD法により、ガラス基板上にInGaO3(Zn1-xMgxO)4(0<x≦1)膜を成膜した。
成膜装置は、図12に記載の装置を用いた。被成膜基板としては、SiO2ガラス基板(コーニング社製1737)を用意した。その基板に前処理として、超音波脱脂洗浄を、アセトン、エタノール、超純水により各5分間ずつ行った後、空気中100℃で.乾燥させた。ターゲットとしては、InGa(Zn1-xMgxO)4(x=1-0)焼結体(サイズ 20mmΦ5mmt)を用いた。
(PLD法によるIn2O3アモルファス酸化物膜の成膜)
KrFエキシマレーザーを用いたPLD法により、In2O3多結晶焼結体をターゲットとして、厚さ200μmのPETフィルム上にIn2O3膜を成膜した。
(PLD法によるIn−Sn−O系アモルファス酸化物膜の成膜)
KrFエキシマレーザーを用いたPLD法により、(In0.9Sn0.1)O3.1多結晶焼結体をターゲットとして、厚さ200μmのPETフィルム上にIn−Sn−O系酸化物膜を成膜した。
被成膜基板として、SiO2ガラス基板(コーニング社製1737)を用意した。基板前処理として、超音波脱脂洗浄をアセトン、エタノール、超純水を用いて各5分間ずつ行った。その後、空気中100℃で乾燥させた。
(PLD法によるIn−Ga−O系アモルファス酸化物膜の成膜)
被成膜基板として、SiO2ガラス基板(コーニング社製1737)を用意した。
(In−Zn−Ga−O系アモルファス酸化物膜を用いたTFT素子の作製(ガラス基板))
TFT素子の作製
図5に示すトップゲート型TFT素子を作製した。
図6に、室温下で測定したTFT素子の電流−電圧特性を示す。ドレイン電圧VDSの増加に伴い、ドレイン電流IDSが増加したことからチャネルがn型伝導であることが分かる。
(In−Zn−Ga−O系アモルファス酸化物膜を用いたTFT素子の作製(アモルファス基板))
図5に示すトップゲート型TFT素子を作製した。まず、ポリエチレン・テレフタレート(PET)フィルム(1)上に、PLD法により、酸素分圧5Paの雰囲気で、チャンネル層(2)として用いる厚さ120nmのIn−Zn−Ga−O系アモルファス酸化物膜を形成した。このとき、InGaO3(ZnO)組成を有する多結晶焼結体をターゲットとした。
PETフィルム上に形成したTFTの室温下で測定した電流−電圧特性は、図6と同様であった。すなわち、ドレイン電圧VDSの増加に伴い、ドレイン電流IDSが増加したことから、チャネルがn型伝導であることが分かる。これは、アモルファスIn−Ga−Zn−O系アモルファス酸化物膜がn型伝導体であるという事実と矛盾しない。IDSはVDS= 6 V程度で飽和(ピンチオフ)する典型的なトランジスタの挙動を示した。また、Vg=0のときには、Ids=10−8A,Vg=10 V時には、IDS=2.0 × 10-5Aの電流が流れた。これはゲートバイアスにより絶縁体のIn-Ga-Zn-O系アモルファス酸化物膜内に電子キャリアを誘起できたことに対応する。
(PLD法によるIn2O3アモルファス酸化物膜を用いたTFT素子の作成)
図5に示すトップゲート型TFT素子を作製した。まず、ポリエチレン・テレフタレート(PET)フィルム(1)上に、PLD法により、チャンネル層(2)として用いる厚さ80nmのIn2O3アモルファス酸化物膜を形成した。
PETフィルム上に形成したTFTの室温下で測定した電流−電圧特性を測定した。ドレイン電圧VDSの増加に伴い、ドレイン電流IDSが増加したことからチャネルがn型半導体であることが分かる。これは、In -O系アモルファス酸化物膜がn型伝導体であるという事実と矛盾しない。IDSはVDS= 5 V程度で飽和(ピンチオフ)する典型的なトランジスタの挙動を示した。また、Vg=0V時には、2×10−8A、VG=10 V時には、IDS=2.0 ×10-6Aの電流が流れた。これはゲートバイアスにより絶縁体のIn-O系アモルファス酸化物膜内に電子キャリアを誘起できたことに対応する。
(PLD法によるIn−Sn−O系アモルファス酸化物膜を用いたTFT素子の作成)
図5に示すトップゲート型TFT素子を作製した。まず、ポリエチレン・テレフタレート(PET)フィルム(1)上に、PLD法により、チャンネル層(2)として用いる厚さ100nmのIn−Sn−O系アモルファス酸化物膜を形成した。さらにその上に、チャンバー内酸素分圧を1Pa未満にして、さらに酸素ラジカル発生装置への印加電圧をゼロにして、PLD法により、電気伝導度の大きなIn−Sn−O系アモルファス酸化物膜及び金膜をそれぞれ30nm積層した。そして、フォトリゾグラフィー法とリフトオフ法により、ドレイン端子(5)及びソース端子(6)を形成した。最後にゲート絶縁膜(3)として用いるY2O3膜を電子ビーム蒸着法により成膜し、その上に金を成膜して、フォトリソグラフィー法とリフトオフ法により、ゲート端子(4)を形成した。
PETフィルム上に形成したTFTの室温下で測定した電流−電圧特性を測定した。ドレイン電圧VDSの増加に伴い、ドレイン電流IDSが増加したことからチャネルがn型半導体であることが分かる。これは、In -Sn−O系アモルファス酸化物膜がn型伝導体であるという事実と矛盾しない。IDSはVDS= 6 V程度で飽和(ピンチオフ)する典型的なトランジスタの挙動を示した。また、Vg=0V時には、5×10−8A、VG=10 V時には、IDS=5.0 × 10-5Aの電流が流れた。これはゲートバイアスにより絶縁体のIn-Sn-O系アモルファス酸化物膜内に電子キャリアを誘起できたことに対応する。
(PLD法によるIn−Ga−O系アモルファス酸化物膜を用いたTFT素子の作成)
図5に示すトップゲート型TFT素子を作製した。まず、ポリエチレン・テレフタレート(PET)フィルム(1)上に、実施例6に示した成膜法により、チャンネル層(2)として用いる厚さ120nmのIn−Ga−O系アモルファス酸化物膜を形成した。さらにその上に、チャンバー内の酸素分圧を1Pa未満にして、さらに酸素ラジカル発生装置への印加電圧をゼロにして、PLD法により、電気伝導度の大きなIn−Ga−O系アモルファス酸化物膜及び金膜をそれぞれ30nm積層した。そして、フォトリゾグラフィー法とリフトオフ法により、ドレイン端子(5)及びソース端子(6)を形成した。最後にゲート絶縁膜(3)として用いるY2O3膜を電子ビーム蒸着法により成膜し、その上に金を成膜して、フォトリソグラフィー法とリフトオフ法により、ゲート端子(4)を形成した。
PETフィルム上に形成したTFTの室温下で測定した電流−電圧特性を測定した。ドレイン電圧VDSの増加に伴い、ドレイン電流IDSが増加したことからチャネルがn型半導体であることが分かる。これは、In −Ga−O系アモルファス酸化物膜がn型伝導体であるという事実と矛盾しない。IDSはVDS= 6 V程度で飽和(ピンチオフ)する典型的なトランジスタの挙動を示した。また、Vg=0V時には、1×10−8A、VG=10 V時には、IDS=1.0 × 10-6Aの電流が流れた。これはゲートバイアスにより絶縁体のIn-Ga-O系アモルファス酸化物膜内に電子キャリアを誘起できたことに対応する。
(実施例1)
(薄膜トランジスタの作製)
チャネル長=10μm、チャネル幅=200μmのスタガ型のトップゲート薄膜トランジスタをガラス基板上に作製する。
半絶縁性アモルファスInGaO3(ZnO)4膜を用いたコプレナー型ボトムゲート薄膜トランジスタの作製・評価(サンプルC、D)
図10(A)は、ゲート電極とソース・ドレイン電極の重なり幅が3μmの半絶縁性アモルファスInGaO3(ZnO)4膜によるコプレナー型ボトムゲート薄膜トランジスタ(素子C)の断面図である。
素子Cの製造工程は以下の通りである。
702,708,802,902 ドレイン端子
703,709,803,903 ソース端子
704,710,804,904 半導体層(半絶縁性アモルファスInGaO3(ZnO)4膜)
705,711,805,905 ゲート絶縁膜
706,712,810,910 ゲート電極
Claims (7)
- 電界効果型トランジスタであって、
ソース電極、ドレイン電極、ゲート電極、及び
電子キャリア濃度が1018/cm3未満である非晶質酸化物を含む活性層を備え、且つ
該ゲート電極と、該ソース及びドレイン電極とが自己整合していることを特徴とする電界効果型トランジスタ。 - 前記非晶質酸化物が、In、Zn、及びSnのいずれかを含む酸化物であることを特徴とする請求項1記載の電界効果型トランジスタ。
- 前記非晶質酸化物が、InとZnとSnを含む酸化物、InとZnを含む酸化物、InとSnを含む酸化物、及びInを含む酸化物のうちのいずれかである請求項1記載の電界効果型トランジスタ。
- 前記電界効果型トランジスタは、透明基板上に形成されている前記ソース及びドレイン電極のパターンをマスクとして、前記ゲート電極のパターンを形成するトップゲート型トランジスタであることを特徴とする請求項1から3のいずれか1項に記載の電界効果型トランジスタ。
- 前記電界効果型トランジスタは、透明基板上に形成されているゲート電極のパターンをマスクとして、前記ソース及びドレイン電極のパターンを形成するボトムゲート型トランジスタであることを特徴とする請求項1から3のいずれか1項に記載の電界効果型トランジスタ。
- 電界効果型トランジスタであって、
ソース電極、ドレイン電極、ゲート電極、及び
電子キャリア濃度が増加すると共に、電子移動度が増加する傾向を示す非晶質酸化物を含む活性層を備え、且つ
該ゲート電極と、該ソース及びドレイン電極とが自己整合していることを特徴とする電界効果型トランジスタ。 - 電界効果型トランジスタであって、
ソース電極、ドレイン電極、ゲート電極、及び
非晶質酸化物を含む活性層を備え、
該ゲート電極と、該ソース及びドレイン電極とが自己整合しており、且つノーマリーオフ型であることを特徴とする電界効果型トランジスタ。
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