JP2008047898A - 半導体素子製造方法 - Google Patents
半導体素子製造方法 Download PDFInfo
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- KRHYYFGTRYWZRS-UHFFFAOYSA-N Fluorane Chemical compound F KRHYYFGTRYWZRS-UHFFFAOYSA-N 0.000 claims description 56
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- 229910052814 silicon oxide Inorganic materials 0.000 claims description 15
- 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 claims description 14
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- 150000004767 nitrides Chemical class 0.000 claims description 8
- 150000002894 organic compounds Chemical class 0.000 claims description 8
- HQVNEWCFYHHQES-UHFFFAOYSA-N silicon nitride Chemical compound N12[Si]34N5[Si]62N3[Si]51N64 HQVNEWCFYHHQES-UHFFFAOYSA-N 0.000 claims description 8
- 229910021420 polycrystalline silicon Inorganic materials 0.000 claims description 7
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims description 6
- 239000005388 borosilicate glass Substances 0.000 claims description 6
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- 230000004888 barrier function Effects 0.000 claims description 5
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- 239000010937 tungsten Substances 0.000 claims description 5
- WQJQOUPTWCFRMM-UHFFFAOYSA-N tungsten disilicide Chemical compound [Si]#[W]#[Si] WQJQOUPTWCFRMM-UHFFFAOYSA-N 0.000 claims description 5
- 229910021342 tungsten silicide Inorganic materials 0.000 claims description 5
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 4
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- IVHJCRXBQPGLOV-UHFFFAOYSA-N azanylidynetungsten Chemical compound [W]#N IVHJCRXBQPGLOV-UHFFFAOYSA-N 0.000 claims description 4
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- 239000002270 dispersing agent Substances 0.000 claims description 4
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- 239000000654 additive Substances 0.000 claims 2
- 230000000996 additive effect Effects 0.000 claims 2
- 239000010410 layer Substances 0.000 description 176
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 description 18
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- 229910052796 boron Inorganic materials 0.000 description 4
- BHEPBYXIRTUNPN-UHFFFAOYSA-N hydridophosphorus(.) (triplet) Chemical compound [PH] BHEPBYXIRTUNPN-UHFFFAOYSA-N 0.000 description 4
- 238000002955 isolation Methods 0.000 description 4
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- 238000000926 separation method Methods 0.000 description 1
- LIVNPJMFVYWSIS-UHFFFAOYSA-N silicon monoxide Chemical group [Si-]#[O+] LIVNPJMFVYWSIS-UHFFFAOYSA-N 0.000 description 1
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- 238000001039 wet etching Methods 0.000 description 1
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- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
- H01L21/04—Manufacture or treatment of semiconductor devices or of parts thereof the devices having potential barriers, e.g. a PN junction, depletion layer or carrier concentration layer
- H01L21/18—Manufacture or treatment of semiconductor devices or of parts thereof the devices having potential barriers, e.g. a PN junction, depletion layer or carrier concentration layer the devices having semiconductor bodies comprising elements of Group IV of the Periodic Table or AIIIBV compounds with or without impurities, e.g. doping materials
- H01L21/30—Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/26
- H01L21/302—Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/26 to change their surface-physical characteristics or shape, e.g. etching, polishing, cutting
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Abstract
【解決手段】半導体基板上にコンタクトホールを持つ絶縁層を形成し、コンタクトホールに露出された表面の自然酸化物汚染物を、アルコール類有機化合物、例えば、グリコール類有機化合物またはイソプロピルアルコール(IPA)に分散されたふっ素(F)を含む化学種を含むエッチング液(etchant)を用いて、好ましくは1.0以下の低選択比(low selectivity)で洗浄する。その後、コンタクトホールを導電層で埋め込んで連結コンタクトを形成する。
【選択図】図7
Description
Claims (22)
- 洗浄対象層の表面汚染物を、アルコール類有機化合物に分散されたふっ素(F)を含む化学種を含むエッチング液(etchant)を用いて洗浄する工程を含む半導体素子製造方法。
- 前記洗浄対象層は、シリコン基板、多結晶シリコン層、非晶質シリコン層、タングステン(W)層、タングステン窒化物(WN)層、タングステンシリサイド(WSix)層、チタン(Ti)層、チタン窒化物(TiN)層、銅(Cu)層、アルミニウム(Al)層及び亜鉛(Zn)層を含む群から選ばれるいずれか1層を含む、請求項1に記載の半導体素子製造方法。
- 前記洗浄は、前記アルコール類有機化合物としてイソプロピルアルコール(IPA)を80%以上含み、前記イソプロピルアルコールに、ふっ酸(HF)、ふっ素イオン(F-)またはふっ酸イオン(HF2 -)が前記ふっ素(F)を含む化学種として20%未満で分散された前記エッチング液を用いて行われる、請求項1に記載の半導体素子製造方法。
- 前記洗浄は、前記アルコール類有機化合物としてグリコール(glycol)類有機化合物を80%以上含み、前記グリコール(glycol)類有機化合物に、ふっ酸(HF)、ふっ素イオン(F-)またはふっ酸イオン(HF2 -)が前記ふっ素(F)を含む化学種として20%未満で分散された前記エッチング液を用いて行われる、請求項1に記載の半導体素子製造方法。
- 前記エッチング液は、前記ふっ素(F)を含む化学種の分散を促す分散剤(surfactant)を添加剤(ingredient)としてさらに含む、請求項3または4に記載の半導体素子製造方法。
- 前記洗浄は、水分含量が10%未満に制御された前記エッチング液を用いて行われる、請求項1に記載の半導体素子製造方法。
- 前記洗浄は、前記アルコール類有機化合物溶液にふっ酸(HF)溶液を混合して作られた前記エッチング液を用いて行われる、請求項1に記載の半導体素子製造方法。
- 前記洗浄は、前記エッチング液を用いて、前記洗浄対象層表面に形成された自然酸化物(native oxide)を除去するように行われる、請求項1に記載の半導体素子製造方法。
- 絶縁層を通じて露出される洗浄対象層表面の汚染物を、アルコール類有機化合物に分散されたふっ素(F)を含む化学種を含むエッチング液(etchant)を用いて洗浄する工程を含む、半導体素子製造方法。
- 前記洗浄は、前記アルコール類有機化合物としてイソプロピルアルコール(IPA)またはグリコール類有機化合物を80%以上含み、前記有機化合物に、ふっ酸(HF)、ふっ素イオン(F-)またはふっ酸イオン(HF2 -)が前記ふっ素(F)を含む化学種として20%未満で分散された前記エッチング液を用いて行われる、請求項9に記載の半導体素子製造方法。
- 前記絶縁層は、ボロホスホシリケートガラス(BPSG)、ホスホシリケートガラス(PSG)、ボロシリケートガラス(BSG)、低圧−TEOS(Low Pressure−Tetra Ethyl Ortho Silicate)、プラズマ改善−TEOS(Plasma Enhanced−TEOS)、高密度プラズマシリコン酸化物(HDP silicon oxide)、アンドープシリケートガラス(USG)、低圧−窒化物(LP−nitride)、プラズマ改善窒化物(PE−nitride)、シリコン酸窒化物(SiON)、スピンオン誘電物(SOD)または熱酸化物(thermal oxide)を含む群より選ばれるいずれか1絶縁物質を含んで形成される、請求項9に記載の半導体素子製造方法。
- 下部層上に絶縁層を形成する工程と、
前記絶縁層を選択的エッチングして、前記下部層の表面を露出するコンタクトホールを形成する工程と、
前記コンタクトホールに露出された前記下部層表面の汚染物を、アルコール類有機化合物に分散されたふっ素(F)を含む化学種を含むエッチング液(etchant)を用いて洗浄する工程と、
前記コンタクトホールを導電層で埋め込んで連結コンタクトを形成する工程と、
を含む、半導体素子製造方法。 - 前記洗浄は、前記アルコール類有機化合物としてイソプロピルアルコール(IPA)またはグリコール類有機化合物を80%以上含み、前記有機化合物に、ふっ酸(HF)、ふっ素イオン(F-)またはふっ酸イオン(HF2 -)が前記ふっ素(F)を含む化学種として20%未満で分散された前記エッチング液を用いて行われる、請求項12に記載の半導体素子製造方法。
- 半導体基板上に第1導電層、側部のスペーサ及び上部のギャップ層を含むゲートスタック(stack)を形成する工程と、
これらのゲートスタックを覆う絶縁層を形成する工程と、
前記絶縁層を前記スペーサ及び前記ギャップ層を障壁としてエッチングし、コンタクトホールを形成する工程と、
前記コンタクトホールに露出された前記半導体基板の表面に発生した汚染物を、アルコール類有機化合物に分散されたふっ素(F)を含む化学種を含むエッチング液(etchant)を用いて洗浄する工程と、
前記洗浄されたコンタクトホールを埋め込む第2導電層を形成する工程と、
前記第2導電層を前記ギャップ層が露出されるように平坦化し、前記スタック及び残留する前記絶縁層部分によって分離された連結コンタクトを形成する工程と、
を含む、半導体素子製造方法。 - 前記第1導電層は、ゲート誘電層を下部に有するゲート層で形成され、
前記スペーサ及び前記ギャップ層は、シリコン窒化物を含んで形成され、
前記絶縁層は、ボロホスホシリケート(BPSG)層を含んで形成され、
前記絶縁層の下部に前記スペーサ及び前記ギャップ層を覆うスペーサ絶縁層がアンドープシリケートガラス(USG)層を含んで形成される段階をさらに含む、請求項14に記載の半導体素子製造方法。 - 前記洗浄は、前記絶縁層、前記スペーサ及び前記ギャップ層のエッチング率が自然酸化物に対して3.0以下となるように前記ふっ素(F)を含む化学種の含量が制御された前記エッチング液を用いて行われる、請求項14に記載の半導体素子製造方法。
- 前記洗浄は、前記絶縁層、前記スペーサ及び前記ギャップ層のエッチング率が自然酸化物に対して1.0以下となるように前記ふっ素(F)を含む化学種の含量が制御された前記エッチング液を用いて行われる、請求項14に記載の半導体素子製造方法。
- 前記洗浄は、前記アルコール類有機化合物としてイソプロピルアルコール(IPA)を80%以上含み、前記有機化合物にふっ酸(HF)、ふっ素イオン(F-)またはふっ酸イオン(HF2 -)が前記ふっ素(F)を含む化学種として20%未満で分散された前記エッチング液を用いて行われる、請求項14に記載の半導体素子製造方法。
- 前記洗浄は、前記アルコール類有機化合物としてグリコール類有機化合物を少なくとも80%以上含み、前記有機化合物に、ふっ酸(HF)、ふっ素イオン(F-)またはふっ酸イオン(HF2 -)が前記ふっ素(F)を含む化学種として20%未満で分散された前記エッチング液を用いて行われる、請求項14に記載の半導体素子製造方法。
- 前記エッチング液は、前記ふっ素(F)を含む化学種の分散を促す分散剤(surfactant)を添加剤(ingredient)としてさらに含む、請求項19に記載の半導体素子製造方法。
- 前記洗浄は、水分含量が10%未満に制御された前記エッチング液を用いて行われる、請求項14に記載の半導体素子製造方法。
- 前記洗浄は、前記エッチング液を用いて、前記下部層表面に残留するエッチング残留物(etch residue)または自然酸化物(native oxide)を除去するように行われる、請求項14に記載の半導体素子製造方法。
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KR101790090B1 (ko) * | 2013-05-02 | 2017-10-25 | 후지필름 가부시키가이샤 | 에칭 방법, 이에 이용하는 에칭액 및 에칭액의 키트, 및 반도체 기판 제품의 제조 방법 |
Also Published As
Publication number | Publication date |
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US20080044990A1 (en) | 2008-02-21 |
CN101127299A (zh) | 2008-02-20 |
TW200811935A (en) | 2008-03-01 |
CN100561665C (zh) | 2009-11-18 |
KR100818708B1 (ko) | 2008-04-01 |
KR20080016338A (ko) | 2008-02-21 |
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