JP5856303B2 - 薄膜トランジスタおよびその製造方法 - Google Patents
薄膜トランジスタおよびその製造方法 Download PDFInfo
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- JP5856303B2 JP5856303B2 JP2014531457A JP2014531457A JP5856303B2 JP 5856303 B2 JP5856303 B2 JP 5856303B2 JP 2014531457 A JP2014531457 A JP 2014531457A JP 2014531457 A JP2014531457 A JP 2014531457A JP 5856303 B2 JP5856303 B2 JP 5856303B2
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- 239000010409 thin film Substances 0.000 title claims description 484
- 238000004519 manufacturing process Methods 0.000 title claims description 67
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 261
- 229910052799 carbon Inorganic materials 0.000 claims description 260
- 239000000758 substrate Substances 0.000 claims description 169
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 141
- 229910052710 silicon Inorganic materials 0.000 claims description 141
- 239000010703 silicon Substances 0.000 claims description 141
- 238000000034 method Methods 0.000 claims description 125
- 239000010408 film Substances 0.000 claims description 91
- 239000012535 impurity Substances 0.000 claims description 31
- 229910052751 metal Inorganic materials 0.000 claims description 27
- 239000002184 metal Substances 0.000 claims description 27
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims description 14
- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 claims 1
- 229910001882 dioxygen Inorganic materials 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 81
- 239000004020 conductor Substances 0.000 description 53
- 239000008186 active pharmaceutical agent Substances 0.000 description 41
- 239000007789 gas Substances 0.000 description 26
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 22
- 229910052760 oxygen Inorganic materials 0.000 description 22
- 239000001301 oxygen Substances 0.000 description 22
- 239000001257 hydrogen Substances 0.000 description 15
- 229910052739 hydrogen Inorganic materials 0.000 description 15
- 238000005530 etching Methods 0.000 description 14
- 229910052737 gold Inorganic materials 0.000 description 14
- 238000000206 photolithography Methods 0.000 description 11
- 238000005566 electron beam evaporation Methods 0.000 description 10
- 229910052796 boron Inorganic materials 0.000 description 6
- 238000009826 distribution Methods 0.000 description 6
- 230000005684 electric field Effects 0.000 description 6
- 230000002093 peripheral effect Effects 0.000 description 6
- 229910052698 phosphorus Inorganic materials 0.000 description 6
- SECXISVLQFMRJM-UHFFFAOYSA-N N-Methylpyrrolidone Chemical compound CN1CCCC1=O SECXISVLQFMRJM-UHFFFAOYSA-N 0.000 description 5
- 125000004429 atom Chemical group 0.000 description 5
- 238000009832 plasma treatment Methods 0.000 description 5
- 239000004065 semiconductor Substances 0.000 description 5
- 229910004298 SiO 2 Inorganic materials 0.000 description 4
- 238000000609 electron-beam lithography Methods 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 238000005192 partition Methods 0.000 description 4
- 238000001020 plasma etching Methods 0.000 description 4
- KRHYYFGTRYWZRS-UHFFFAOYSA-N Fluorane Chemical compound F KRHYYFGTRYWZRS-UHFFFAOYSA-N 0.000 description 3
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 3
- 229910021421 monocrystalline silicon Inorganic materials 0.000 description 3
- 238000012856 packing Methods 0.000 description 3
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 150000002431 hydrogen Chemical class 0.000 description 2
- 238000009616 inductively coupled plasma Methods 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 229910021420 polycrystalline silicon Inorganic materials 0.000 description 2
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 1
- BLRPTPMANUNPDV-UHFFFAOYSA-N Silane Chemical compound [SiH4] BLRPTPMANUNPDV-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- JRPBQTZRNDNNOP-UHFFFAOYSA-N barium titanate Chemical compound [Ba+2].[Ba+2].[O-][Ti]([O-])([O-])[O-] JRPBQTZRNDNNOP-UHFFFAOYSA-N 0.000 description 1
- 229910002113 barium titanate Inorganic materials 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000003990 capacitor Substances 0.000 description 1
- 125000004432 carbon atom Chemical group C* 0.000 description 1
- 239000011852 carbon nanoparticle Substances 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 238000002425 crystallisation Methods 0.000 description 1
- 230000008025 crystallization Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000002500 effect on skin Effects 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 229910021389 graphene Inorganic materials 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 239000002608 ionic liquid Substances 0.000 description 1
- 150000001247 metal acetylides Chemical class 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- QPJSUIGXIBEQAC-UHFFFAOYSA-N n-(2,4-dichloro-5-propan-2-yloxyphenyl)acetamide Chemical compound CC(C)OC1=CC(NC(C)=O)=C(Cl)C=C1Cl QPJSUIGXIBEQAC-UHFFFAOYSA-N 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 238000000059 patterning Methods 0.000 description 1
- 239000011574 phosphorus Substances 0.000 description 1
- 238000005268 plasma chemical vapour deposition Methods 0.000 description 1
- 229910000077 silane Inorganic materials 0.000 description 1
- 235000012239 silicon dioxide Nutrition 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 229910052814 silicon oxide Inorganic materials 0.000 description 1
- 238000009751 slip forming Methods 0.000 description 1
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- H01L29/772—Field effect transistors
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- H01L29/786—Thin film transistors, i.e. transistors with a channel being at least partly a thin film
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- H01L29/78687—Thin film transistors, i.e. transistors with a channel being at least partly a thin film having a semiconductor body comprising semiconductor materials of Group IV not being silicon, or alloys including an element of the group IV, e.g. Ge, SiN alloys, SiC alloys with a multilayer structure or superlattice structure
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- H01L29/1025—Channel region of field-effect devices
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- H01L29/7789—Field effect transistors with two-dimensional charge carrier gas channel, e.g. HEMT ; with two-dimensional charge-carrier layer formed at a heterojunction interface the two-dimensional charge carrier gas being at least partially not parallel to a main surface of the semiconductor body
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Description
図1は、この発明の実施の形態1による薄膜トランジスタの構成を示す断面図である。また、図2は、図1に示すA方向から見た薄膜トランジスタの平面図である。
工程(d)においてカーボンナノウォール薄膜21〜25を形成するときの基板温度Tsを400℃に設定し、図7および図8に示す工程(a)〜工程(h)を用いて実施例1における薄膜トランジスタ10Aを作製した。
工程(d)においてカーボンナノウォール薄膜21〜25を形成するときの基板温度Tsを500℃に設定した以外は、実施例1と同じ方法によって実施例2における薄膜トランジスタ10Bを作製した。
工程(d)においてカーボンナノウォール薄膜21〜25を形成するときの基板温度Tsを600℃に設定した以外は、実施例1と同じ方法によって実施例3における薄膜トランジスタ10Cを作製した。
図11から図13に示す工程(a)〜工程(l)を用いて実施例4における薄膜トランジスタ10Dを作製した。この場合、カーボンナノウォール薄膜21〜25を形成するときの基板温度Tsは、500℃である。
図14および図15に示す工程(a)〜(d),(d−1),(e)〜(h)を用いて実施例5における薄膜トランジスタ10Eを作製した。この場合、カーボンナノウォール薄膜21〜25を形成するときの基板温度Tsは、600℃である。
工程(d)において、基板温度Tsを400℃に設定してカーボンナノウォール薄膜を形成し、その後、基板温度Tsを600℃に設定してカーボンナノウォール薄膜を形成した以外、図7および図8に示す工程(a)〜工程(h)を用いて実施例6における薄膜トランジスタ10Fを作製した。
図22は、実施の形態2による薄膜トランジスタの構成を示す断面図である。また、図23は、図22に示すA方向から見た薄膜トランジスタの平面図である。
図35は、実施の形態3による薄膜トランジスタの構成を示す断面図である。図35を参照して、実施の形態3による薄膜トランジスタ300は、シリコン基板1と、チャネル層2と、絶縁膜301〜304と、ゲート電極305〜312と、ソース電極320と、ドレイン電極330とを備える。
Claims (9)
- 一主面に凹凸形状がストライプ状または碁盤目状に形成されたシリコン基板と、
前記凹凸形状の凸部の長さ方向に沿って複数の凸部上に配置され、各々が前記シリコン基板の法線方向に成長した複数のカーボンナノウォール薄膜からなるチャネル層と、
前記複数のカーボンナノウォール薄膜の各々において前記カーボンナノウォール薄膜の厚み方向に平行な第1の側面に少なくとも接するソース電極と、
前記カーボンナノウォール薄膜の面内方向において前記ソース電極に対向するように配置され、前記複数のカーボンナノウォール薄膜の各々において前記第1の側面に対向する第2の側面に少なくとも接するドレイン電極と、
ゲート電極と、
前記複数のカーボンナノウォール薄膜と前記ゲート電極との間に配置された絶縁膜とを備える薄膜トランジスタ。 - 前記絶縁膜は、前記シリコン基板の前記一主面と反対側の表面に接して配置され、
前記ゲート電極は、前記絶縁膜に接して配置され、
前記ソース電極および前記ドレイン電極は、前記凹凸形状の凸部の長さ方向に沿って配置される、請求項1に記載の薄膜トランジスタ。 - 前記絶縁膜は、前記複数のカーボンナノウォール薄膜の各々において前記シリコン基板側と反対側で前記カーボンナノウォール薄膜の厚み方向に平行な第3の側面に接して配置され、
前記ゲート電極は、前記絶縁膜に接して配置され、
前記ソース電極および前記ドレイン電極は、前記凹凸形状の凸部の長さ方向に沿って配置される、請求項1に記載の薄膜トランジスタ。 - 前記ソース電極は、前記複数のカーボンナノウォール薄膜に対応して設けられ、各々が対応するカーボンナノウォール薄膜の前記第1の側面に少なくとも接して配置された複数のソース電極部材からなり、
前記ドレイン電極は、前記複数のカーボンナノウォール薄膜に対応して設けられ、各々が対応するカーボンナノウォール薄膜の前記第2の側面に少なくとも接して配置された複数のドレイン電極部材からなる、請求項2または請求項3に記載の薄膜トランジスタ。 - 前記絶縁膜は、前記複数のカーボンナノウォール薄膜に対応して設けられるとともに前記カーボンナノウォール薄膜の面内方向に沿って配置され、各々が対応するカーボンナノウォール薄膜に接する複数のゲート絶縁膜からなり、
前記ゲート電極は、前記複数のゲート絶縁膜に対応して設けられ、各々が対応するゲート絶縁膜に接して配置された複数のゲート電極部材からなり、
前記ソース電極および前記ドレイン電極の一方は、前記凸部側において前記シリコン基板中に配置され、
前記ソース電極および前記ドレイン電極の他方は、前記シリコン基板の法線方向において前記シリコン基板側と反対側に配置される、請求項1に記載の薄膜トランジスタ。 - 前記絶縁膜は、前記複数のカーボンナノウォール薄膜に対応して設けられるとともに前記カーボンナノウォール薄膜の面内方向に沿って配置され、各々が対応するカーボンナノウォール薄膜に接する複数のゲート絶縁膜からなり、
前記ゲート電極は、前記複数のゲート絶縁膜に対応して設けられ、各々が対応するゲート絶縁膜に接して配置された複数のゲート電極部材からなり、
前記ソース電極および前記ドレイン電極の一方は、前記複数のカーボンナノウォール薄膜に対応して設けられた複数の第1の電極部材からなり、
前記ソース電極および前記ドレイン電極の他方は、前記複数のカーボンナノウォール薄膜に対応して設けられた複数の第2の電極部材からなり、
前記複数の第1の電極部材の各々は、対応するカーボンナノウォール薄膜に接する凸部に形成された不純物領域と、前記不純物領域に接して配置された金属領域とを含み、
前記複数の第2の電極部材の各々は、対応するカーボンナノウォール薄膜の厚み方向に平行であり、かつ、前記対応するカーボンナノウォール薄膜の前記シリコン基板側と反対側に配置された第3の側面に接する、請求項1に記載の薄膜トランジスタ。 - 複数のカーボンナノウォール薄膜をチャネル層として用いた薄膜トランジスタの製造方法であって、
シリコン基板の一主面に凹凸形状をストライプ状または碁盤目状に形成する第1の工程と、
前記凹凸形状の凸部の長さ方向に沿って複数の凸部上に複数のカーボンナノウォール薄膜を形成する第2の工程と、
前記複数のカーボンナノウォール薄膜の各々において前記カーボンナノウォール薄膜の厚み方向に平行な第1の側面に少なくとも接するようにソース電極を形成する第3の工程と、
前記カーボンナノウォール薄膜の面内方向において前記ソース電極に対向するように配置され、複数のカーボンナノウォール薄膜の各々において前記第1の側面に対向する第2の側面に少なくとも接するようにドレイン電極を形成する第4の工程と、
前記複数のカーボンナノウォール薄膜に対向して絶縁膜を形成する第5の工程と、
前記絶縁膜に接してゲート電極を形成する第6の工程とを備える薄膜トランジスタの製造方法。 - 前記薄膜トランジスタの配置位置以外の領域に形成されたカーボンナノウォール薄膜を酸素ガスを用いたプラズマによって除去する第7の工程を更に備える、請求項7に記載の薄膜トランジスタの製造方法。
- 前記複数のカーボンナノウォール薄膜を水素ガスを用いたプラズマによって処理する第8の工程を更に備え、
前記第3および第4の工程は、前記第8の工程に続いて実行される、請求項7または請求項8に記載の薄膜トランジスタの製造方法。
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