JPH08213388A - フルオロケイ酸塩ガラス層を形成する方法 - Google Patents
フルオロケイ酸塩ガラス層を形成する方法Info
- Publication number
- JPH08213388A JPH08213388A JP7255352A JP25535295A JPH08213388A JP H08213388 A JPH08213388 A JP H08213388A JP 7255352 A JP7255352 A JP 7255352A JP 25535295 A JP25535295 A JP 25535295A JP H08213388 A JPH08213388 A JP H08213388A
- Authority
- JP
- Japan
- Prior art keywords
- precursor gas
- fluorine
- forming
- glass
- precursor
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 239000011521 glass Substances 0.000 title claims abstract description 22
- 238000000034 method Methods 0.000 title claims description 46
- 229940104869 fluorosilicate Drugs 0.000 title claims description 13
- 230000015572 biosynthetic process Effects 0.000 title description 3
- 239000007789 gas Substances 0.000 claims abstract description 79
- 239000002243 precursor Substances 0.000 claims abstract description 69
- 229910052731 fluorine Inorganic materials 0.000 claims abstract description 55
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 claims abstract description 51
- 239000011737 fluorine Substances 0.000 claims abstract description 51
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 21
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 20
- 239000001301 oxygen Substances 0.000 claims abstract description 20
- 238000007496 glass forming Methods 0.000 claims abstract description 16
- 125000004429 atom Chemical group 0.000 claims abstract description 15
- 238000006243 chemical reaction Methods 0.000 claims abstract description 14
- 125000001153 fluoro group Chemical group F* 0.000 claims abstract description 9
- 229910052739 hydrogen Inorganic materials 0.000 claims description 18
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims description 16
- 239000001257 hydrogen Substances 0.000 claims description 16
- BOTDANWDWHJENH-UHFFFAOYSA-N Tetraethyl orthosilicate Chemical compound CCO[Si](OCC)(OCC)OCC BOTDANWDWHJENH-UHFFFAOYSA-N 0.000 claims description 11
- 229910052710 silicon Inorganic materials 0.000 claims description 7
- 239000012686 silicon precursor Substances 0.000 claims description 7
- 229910018557 Si O Inorganic materials 0.000 claims description 6
- LIVNPJMFVYWSIS-UHFFFAOYSA-N silicon monoxide Inorganic materials [Si-]#[O+] LIVNPJMFVYWSIS-UHFFFAOYSA-N 0.000 claims description 6
- 229910004014 SiF4 Inorganic materials 0.000 claims description 5
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 5
- 239000010703 silicon Substances 0.000 claims description 5
- 239000000203 mixture Substances 0.000 claims description 4
- 239000004065 semiconductor Substances 0.000 claims description 4
- 239000000758 substrate Substances 0.000 claims description 4
- 239000010410 layer Substances 0.000 description 9
- 229910008284 Si—F Inorganic materials 0.000 description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 7
- 229910020175 SiOH Inorganic materials 0.000 description 4
- 229910052796 boron Inorganic materials 0.000 description 4
- 230000009977 dual effect Effects 0.000 description 4
- 229910052698 phosphorus Inorganic materials 0.000 description 4
- 238000001228 spectrum Methods 0.000 description 4
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 3
- 230000008901 benefit Effects 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 238000000623 plasma-assisted chemical vapour deposition Methods 0.000 description 3
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 2
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 description 2
- 238000005033 Fourier transform infrared spectroscopy Methods 0.000 description 2
- 238000001157 Fourier transform infrared spectrum Methods 0.000 description 2
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 2
- 229910020177 SiOF Inorganic materials 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 238000005229 chemical vapour deposition Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000005284 excitation Effects 0.000 description 2
- 239000012528 membrane Substances 0.000 description 2
- 229910052757 nitrogen Inorganic materials 0.000 description 2
- 239000011574 phosphorus Substances 0.000 description 2
- 244000061408 Eugenia caryophyllata Species 0.000 description 1
- KRHYYFGTRYWZRS-UHFFFAOYSA-N Fluorane Chemical compound F KRHYYFGTRYWZRS-UHFFFAOYSA-N 0.000 description 1
- 101100400378 Mus musculus Marveld2 gene Proteins 0.000 description 1
- 235000016639 Syzygium aromaticum Nutrition 0.000 description 1
- 229910052786 argon Inorganic materials 0.000 description 1
- 229910052785 arsenic Inorganic materials 0.000 description 1
- 239000012159 carrier gas Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000000151 deposition Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 229910052732 germanium Inorganic materials 0.000 description 1
- 229910000040 hydrogen fluoride Inorganic materials 0.000 description 1
- 238000010348 incorporation Methods 0.000 description 1
- 229910052738 indium Inorganic materials 0.000 description 1
- 239000011229 interlayer Substances 0.000 description 1
- 238000010849 ion bombardment Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 238000010943 off-gassing Methods 0.000 description 1
- 239000007800 oxidant agent Substances 0.000 description 1
- 239000000075 oxide glass Substances 0.000 description 1
- 125000004430 oxygen atom Chemical group O* 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000002360 preparation method Methods 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
- ABTOQLMXBSRXSM-UHFFFAOYSA-N silicon tetrafluoride Chemical compound F[Si](F)(F)F ABTOQLMXBSRXSM-UHFFFAOYSA-N 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 241000894007 species Species 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 229910052716 thallium Inorganic materials 0.000 description 1
- 229910052718 tin Inorganic materials 0.000 description 1
- 238000002834 transmittance Methods 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- 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
- H01L21/02104—Forming layers
- 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
- H01L21/02112—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
- H01L21/02123—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
- H01L21/02126—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 containing Si, O, and at least one of H, N, C, F, or other non-metal elements, e.g. SiOC, SiOC:H or SiONC
- H01L21/02131—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 containing Si, O, and at least one of H, N, C, F, or other non-metal elements, e.g. SiOC, SiOC:H or SiONC the material being halogen doped silicon oxides, e.g. FSG
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C16/00—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes
- C23C16/22—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes characterised by the deposition of inorganic material, other than metallic material
- C23C16/30—Deposition of compounds, mixtures or solid solutions, e.g. borides, carbides, nitrides
- C23C16/40—Oxides
- C23C16/401—Oxides containing silicon
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C16/00—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes
- C23C16/44—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes characterised by the method of coating
- C23C16/50—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes characterised by the method of coating using electric discharges
- C23C16/505—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes characterised by the method of coating using electric discharges using radio frequency discharges
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- 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
- H01L21/02104—Forming layers
- H01L21/02107—Forming insulating materials on a substrate
- H01L21/02225—Forming insulating materials on a substrate characterised by the process for the formation of the insulating layer
- H01L21/0226—Forming insulating materials on a substrate characterised by the process for the formation of the insulating layer formation by a deposition process
- H01L21/02263—Forming insulating materials on a substrate characterised by the process for the formation of the insulating layer formation by a deposition process deposition from the gas or vapour phase
- H01L21/02271—Forming insulating materials on a substrate characterised by the process for the formation of the insulating layer formation by a deposition process deposition from the gas or vapour phase deposition by decomposition or reaction of gaseous or vapour phase compounds, i.e. chemical vapour deposition
- H01L21/02274—Forming insulating materials on a substrate characterised by the process for the formation of the insulating layer formation by a deposition process deposition from the gas or vapour phase deposition by decomposition or reaction of gaseous or vapour phase compounds, i.e. chemical vapour deposition in the presence of a plasma [PECVD]
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- 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
- H01L21/31—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
- H01L21/314—Inorganic layers
- H01L21/316—Inorganic layers composed of oxides or glassy oxides or oxide based glass
- H01L21/31604—Deposition from a gas or vapour
- H01L21/31625—Deposition of boron or phosphorus doped silicon oxide, e.g. BSG, PSG, BPSG
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- 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
- H01L21/02104—Forming layers
- 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
- H01L21/02112—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
- H01L21/02123—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
- H01L21/02126—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 containing Si, O, and at least one of H, N, C, F, or other non-metal elements, e.g. SiOC, SiOC:H or SiONC
- H01L21/02129—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 containing Si, O, and at least one of H, N, C, F, or other non-metal elements, e.g. SiOC, SiOC:H or SiONC the material being boron or phosphorus doped silicon oxides, e.g. BPSG, BSG or PSG
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- General Physics & Mathematics (AREA)
- Manufacturing & Machinery (AREA)
- Computer Hardware Design (AREA)
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- Power Engineering (AREA)
- Inorganic Chemistry (AREA)
- Formation Of Insulating Films (AREA)
- Chemical Vapour Deposition (AREA)
Abstract
容量を増加させる、十分なフッ素を有するFガラスの安
定膜を形成する方法を提供する。 【解決の手段】 CVD法において、2つのケイ素源を
用いることにより、耐水性のフッ素添加酸化物が形成さ
れる。一方はフッ素前駆体であり、他方はフッ素前駆体
からの過剰なフッ素と反応するために使用され、層内の
フッ素基の数を低減する。フッ素前駆体は他のガラス要
素と結合するガラス形成要素を含み、気体内にフッ素の
1原子とガラス形成要素の1原子とを含む2原子基を生
成する。
Description
し、特に、フッ素でドープされた酸化絶縁層の形成に関
する。
率を有する絶縁層が研究されてきた。J.Idaらによる論
文"Reduction of Wiring Capacitance with New Dielec
tric SiOF Interlayer Film for High Speed/Low Power
Sub-Half Micron CMOS"、1994Symposium on VLSI Tech
nology Digest of Technical Papers 0-7803-19212-4/9
4 IEEEでは、TEOS(Si(OC2H5)4)と共にC2
F6を用いると、フッ素をドープした低誘電率の二酸化
ケイ素(酸化ケイ素)層(フルオロケイ酸塩ガラスまた
はFガラス)が提供されることを提案している。Fukada
及びAkahoriによる論文"Preparation of SiOF Films wi
th Low Dielectric Constant by ECR Plasma Chemical
Vapor Deposition"、Extended Abstracts of the 1993
International Conference on Solid State Devices an
d Materials、Makuhari、1993 pp.158-160では、O2と
一緒に四フッ化ケイ素(SiF4)を用いる別の提案が
示されている。Anandらによる論文"Fully Integrated B
ack End of the Line Interconnect Process for High
Performance ULSIs"、the 1994 VMIC Conference 1994
ISIMC-103/94/0015では、CF4及びC2F6の使用を提案
している。C2F6法は水を吸収し易い膜を提供し、Si
F4 ECR付着法は、フッ化水素またはフッ素のガス
抜けを生じ易い。なぜなら、高密度の電子サイクロトロ
ン共鳴プラズマ内で解離した過度のF原子が、F−Si
Ox網内に弱結合のフッ素として組込まれるからであ
る。より多くの水が吸収され、F*が失われるとフッ素
はHFを形成し、これが金属部分を腐食する。このよう
に従来技術では、誘電率を十分に低下させ、ギャップ・
フィル容量(gap-fill capacity)を増加させる、十分
なフッ素を有するFガラスの安定膜を形成する満足すべ
き方法が見出されていない。
電率で、ギャップ・フィル容量が大きい、十分量のフッ
素を含有するFガラスの安定膜を形成する方法を提供す
ることである。
酸化物層を形成する方法に関し、具体的には、安定な耐
水性の膜を形成するために、CVD法においてケイ素を
含む酸素前駆気体(oxygen precursor gas)が、ガラス
形成分子を含むガラス形成前駆気体と共に用いられる。
較して、ガラス網を破断すること無く、ガラス形成種が
Si−Fの形態で付着膜に組込まれることである。
れらは互いに反応して、膜を弱めうる遊離したFまたは
Hを除去する。
CVDリアクタなどの反応装置の構成を示す。図の中
央において、反応チャンバ100は接地電極122及び
RF励振電極(RF driven electrode)120を含
む。ウエハ110が接地電極122上に設置される。R
F励振電極120は、好適には2つの周波数源とマッチ
ング網とを含むRF源125によりドライブされる。図
の左側には供給源150が示され、これはアルゴンなど
のキャリア・ガス、TEOSなどのケイ素前駆体、及び
SiF4などのフッ素前駆体を含む気体の供給源を示
す。
気体が混合され、反応チャンバ100内に送られる。こ
の場合には、TEOSも酸素源であるので、酸化剤(ox
idant)は必要ではない。図1に示される構成以外の他
の構成も、付着のために用いることができる。好適に
は、二重周波数の装置が用いられ、プラズマを生成する
ための第1の周波数と、同時にイオン衝突を増進及び制
御するための第2の周波数とを持つ電力が供給される
が、こうした二重周波数の装置でなくてもよい。二重周
波数の装置が用いられる場合には、両周波数は一方また
は両方の電極に供給されうる。
ラズマ促進化学蒸着(PECVD)法もまた用いられ
る。こうした方法には、750トル以下の圧力範囲にお
ける準大気(sub-atmospheric)CVD(SACV
D)、及び高密度CVD(1011個/cm3乃至1012
個/cm3以上の電子密度)などが含まれる。
周波数13.56MHz、低周波数0.35MHz、並
びに総圧力5トルにおけるSiF4:TEOS:O2比が
7:1:10、及び400℃のウエハ温度を用い、二重
周波数PECVDプロセスがApplied Materials 5000リ
アクタにおいて用いられる。
iH4がN2Oと一緒に用いられ、2.8トルにおいてS
iF4:SiH4:N2O比が20:1:35で、400
℃のウエハ温度のパラメータが用いられる。SiF4:
SiH4:N2O混合気体において、粒子の形成を低減す
るために、SiF4前駆体はSiH4とN2Oの混合後に
追加されてもよい。この実施例では、SiH4対SiF4
の比RSiH4-SiF4の適当な範囲は1乃至200であり、
RSiH4-SiF4の好適な範囲は10乃至50である。
tion)は、誘電率と水吸収とのトレードオフに依存す
る。フッ素の高い留分を有する膜は、水を吸収する傾向
があり、フッ素の低い留分を有する膜は、不十分な誘電
率を有する。フッ素の留分の好適な範囲は、酸化物中で
のSi−F結合対Si−O結合の比RF-Oが、1/20
0≦RF-O≦1/4である。この範囲内での好適な比R
F-Oは、約1/20である。
換赤外分光分析)スペクトルが示され、X軸は波数を示
し、Y軸は任意の単位の透過率を示す。
に、膜内において欠陥として作用するSiOHの存在を
示す明白なくぼみが見られる。SiOHは酸化膜の誘電
率を増大させ、電気特性を低下させ、高温で解離する。
下方のスペクトルは、SiF4及びTEOSにより生成
されたサンプルについてであり、極めて低いSiOH濃
度を示す最小のSiOH結合が見られる。
OS)により形成されたサンプルと、C2F6を用いて形
成されたサンプルについてのスペクトルを比較して示
す。膜を湿度100%、温度60℃の環境に24時間晒
す湿度テストの結果、C2F6によるサンプルは相当量の
水を吸収し、SiF4によるサンプルは吸収していない
ことが明らかである。
−O結合比(R)の典型的な変化を示す。RIとRとは
逆比例の関係がある。より高いRに対して、1.37と
低い膜のRIが観測された。
に適用されることが理解されよう。例えば本発明の原理
を変更することなく、SiF4はSixFyにより置換さ
れうる。また、TEOSはSixHy及び酸素により置換
されうる。更に既知のホウ素(B)またはリン(P)ド
ーピングの利点が所望される場合には、B2H6、B
2F6、PH3、PF3または他の好都合なBまたはP前駆
体を所望の組合わせに追加し、ホウ素またはリンのドー
プされたFガラスを生成することができる。
とFとの結合(ここで"ガラス形成"要素とは、Si、
B、P、Ge、As、Se、Sb、In、Tl、Sn、
Pbなどのガラス質構造を形成可能な要素を意味する)
を含む前駆体を用いる利点は、これらの結合を含む基
(radical)が、全体のガラス結合網を解体することな
く、ガラス膜に組込まれうることである。このことは網
を乱し、膜の不安定性を生じるCまたはN前駆体を用い
る場合と対照的である。
素自身をさすためにも用いる。すなわちTEOSと同様
に、O2も酸素原子源となる前駆気体であると解され
る。また、この用語は1つの気体以外に、2つ以上の気
体の混合をさす場合にも用いられる。
囲内において、様々な異なる実施例が可能であることが
理解されよう。
の事項を開示する。
のフッ素と、少なくとも1原子のガラス形成要素とを含
む、気体グループから選択されるフッ素前駆気体を含む
前駆気体の組を反応チャンバ内で混合する工程と、プラ
ズマが少なくとも1つの上記前駆気体と相互作用するよ
うに、上記プラズマを上記反応チャンバ内に形成及び保
持する工程と、上記フッ素前駆気体からのフッ素原子及
びガラス形成要素の原子を含むラジカル基を取り込むこ
とにより、フッ素を一部に含む上記酸化物層を形成する
工程と、を含む、半導体基板上にフルオロケイ酸塩ガラ
ス層を形成する方法。 (2)上記混合工程が、ケイ素前駆気体でもある上記酸
素前駆気体を混合する工程を含み、上記フッ素前駆気体
からの上記ラジカル基に加え、該ケイ素前駆気体からの
ケイ素と該フッ素前駆気体からのフッ素原子との間の結
合を形成することにより、フッ素を上記酸化物層に追加
する、上記(1)記載の方法。 (3)少なくとも1つの上記前駆気体が水素源である、
上記(1)記載の方法。 (4)上記酸素前駆気体が水素源でもある、上記(3)
記載の方法。 (5)上記酸素前駆気体が有機ケイ素気体である、上記
(3)記載の方法。 (6)上記酸素前駆気体が酸素とTEOSとの混合を含
み、上記フッ素前駆気体がSiF4である、上記(3)
記載の方法。 (7)上記TEOS、上記SiF4、及び上記O2が約
7:1:10の比で混合される、上記(6)記載の方
法。 (8)上記フッ素前駆気体がSiF4である、上記
(4)または(5)に記載の方法。 (9)上記プラズマが第1の周波数で供給されるRFパ
ワーにより形成され、同時に第2の周波数のRFパワー
が供給される、上記(1)乃至(3)のいずれかに記載
の方法。 (10)上記フルオロケイ酸塩ガラスにおけるSi−F
結合対Si−O結合の比RF-Oが、1/200≦RF-O≦
1/4の範囲である、上記(9)記載の方法。 (11)上記比RF-Oが1/20である、上記(10)
記載の方法。 (12)酸素前駆気体と、ケイ素及びフッ素の原子源と
なる少なくとも1つの前駆気体とを含む前駆気体の組を
反応チャンバ内で混合する工程を含み、上記フッ素前駆
気体はガラス形成原子を含み、水素前駆気体からの水素
が、上記フッ素前駆気体からの解離原子と反応するため
の水素の原子源となる水素前駆気体を上記前駆気体の組
と一緒に混合することを特徴とし、更にプラズマが少な
くとも1つの上記前駆気体と相互作用するように、上記
プラズマを上記反応チャンバ内に形成及び保持する工程
と、フッ素原子及び上記ガラス形成要素の原子を含むラ
ジカル基を上記フッ素前駆気体から組込むことにより、
フッ素を一部に含む上記酸化物層を形成する工程と、を
含む、半導体基板上にフルオロケイ酸塩ガラス層を形成
する方法。 (13)上記ケイ素前駆気体が水素源でもある、上記
(12)記載の方法。 (14)上記フッ素前駆気体がSiF4である、上記
(12)記載の方法。 (15)上記水素前駆気体がSiH4である、上記(1
4)記載の方法。 (16)上記SiH4対上記SiF4の比RSiH4-SiF4が
約1乃至200の範囲で混合される、上記(15)記載
の方法。 (17)上記比RSiH4-SiF4が約10乃至50の範囲で
ある、上記(16)記載の方法。 (18)上記プラズマが第1の周波数で供給されるRF
パワーにより形成され、同時に第2の周波数のRFパワ
ーが供給される、上記(12)または(13)に記載の
方法。 (19)上記フルオロケイ酸塩ガラスにおけるSi−F
結合対Si−O結合の比RF-Oが、1/200≦RF-O≦
1/4の範囲である、上記(18)記載の方法。
せ、ギャップ・フィル容量を増加させる、十分なフッ素
を有するFガラスの安定膜を形成する満足すべき方法を
提供することができる。
である。
との比較を示すFTIRスペクトルである。
スと、C2F6から形成されるフルオロケイ酸塩ガラスと
の水吸収の比較を示すFTIRスペクトルである。
屈折率の変化を示すグラフである。
Claims (19)
- 【請求項1】酸素前駆気体及び少なくとも1原子のフッ
素と、少なくとも1原子のガラス形成要素とを含む、気
体グループから選択されるフッ素前駆気体を含む前駆気
体の組を反応チャンバ内で混合する工程と、 プラズマが少なくとも1つの上記前駆気体と相互作用す
るように、上記プラズマを上記反応チャンバ内に形成及
び保持する工程と、 上記フッ素前駆気体からのフッ素原子及びガラス形成要
素の原子を含むラジカル基を取り込むことにより、フッ
素を一部に含む上記酸化物層を形成する工程と、 を含む、半導体基板上にフルオロケイ酸塩ガラス層を形
成する方法。 - 【請求項2】上記混合工程が、ケイ素前駆気体でもある
上記酸素前駆気体を混合する工程を含み、上記フッ素前
駆気体からの上記ラジカル基に加え、該ケイ素前駆気体
からのケイ素と該フッ素前駆気体からのフッ素原子との
間の結合を形成することにより、フッ素を上記酸化物層
に追加する、請求項1記載の方法。 - 【請求項3】少なくとも1つの上記前駆気体が水素源で
ある、請求項1記載の方法。 - 【請求項4】上記酸素前駆気体が水素源でもある、請求
項3記載の方法。 - 【請求項5】上記酸素前駆気体が有機ケイ素気体であ
る、請求項3記載の方法。 - 【請求項6】上記酸素前駆気体が酸素とTEOSとの混
合を含み、上記フッ素前駆気体がSiF4である、請求
項3記載の方法。 - 【請求項7】上記TEOS、上記SiF4、及び上記O2
が約7:1:10の比で混合される、請求項6記載の方
法。 - 【請求項8】上記フッ素前駆気体がSiF4である、請
求項4または5に記載の方法。 - 【請求項9】上記プラズマが第1の周波数で供給される
RFパワーにより形成され、同時に第2の周波数のRF
パワーが供給される、請求項1乃至3のいずれかに記載
の方法。 - 【請求項10】上記フルオロケイ酸塩ガラスにおけるS
i−F結合対Si−O結合の比RF-Oが、1/200≦
RF-O≦1/4の範囲である、請求項9記載の方法。 - 【請求項11】上記比RF-Oが1/20である、請求項
10記載の方法。 - 【請求項12】酸素前駆気体と、ケイ素及びフッ素の原
子源となる少なくとも1つの前駆気体とを含む前駆気体
の組を反応チャンバ内で混合する工程を含み、 上記フッ素前駆気体はガラス形成要素の原子を含み、 水素前駆気体からの水素が、上記フッ素前駆気体からの
解離原子と反応するための水素の原子源となる水素前駆
気体を上記前駆気体の組と一緒に混合することを特徴と
し、 更にプラズマが少なくとも1つの上記前駆気体と相互作
用するように、上記プラズマを上記反応チャンバ内に形
成及び保持する工程と、 フッ素原子及び上記ガラス形成要素の原子を含むラジカ
ル基を上記フッ素前駆気体から組込むことにより、フッ
素を一部に含む上記酸化物層を形成する工程と、 を含む、半導体基板上にフルオロケイ酸塩ガラス層を形
成する方法。 - 【請求項13】上記ケイ素前駆気体が水素源でもある、
請求項12記載の方法。 - 【請求項14】上記フッ素前駆気体がSiF4である、
請求項12記載の方法。 - 【請求項15】上記水素前駆気体がSiH4である、請
求項14記載の方法。 - 【請求項16】上記SiH4対上記SiF4の比R
SiH4-SiF4が約1乃至200の範囲で混合される、請求
項15記載の方法。 - 【請求項17】上記比RSiH4-SiF4が約10乃至50の
範囲である、請求項16記載の方法。 - 【請求項18】上記プラズマが第1の周波数で供給され
るRFパワーにより形成され、同時に第2の周波数のR
Fパワーが供給される、請求項12または13に記載の
方法。 - 【請求項19】上記フルオロケイ酸塩ガラスにおけるS
i−F結合対Si−O結合の比RF-Oが、1/200≦
RF-O≦1/4の範囲である、請求項18記載の方法。
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US316302 | 1994-09-30 | ||
US08/316,302 US5563105A (en) | 1994-09-30 | 1994-09-30 | PECVD method of depositing fluorine doped oxide using a fluorine precursor containing a glass-forming element |
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JPH08213388A true JPH08213388A (ja) | 1996-08-20 |
JP3290339B2 JP3290339B2 (ja) | 2002-06-10 |
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US (1) | US5563105A (ja) |
EP (1) | EP0704885B1 (ja) |
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DE (1) | DE69534699T2 (ja) |
TW (1) | TW279245B (ja) |
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- 1995-09-22 EP EP95480142A patent/EP0704885B1/en not_active Expired - Lifetime
- 1995-09-22 DE DE69534699T patent/DE69534699T2/de not_active Expired - Lifetime
- 1995-10-02 JP JP25535295A patent/JP3290339B2/ja not_active Expired - Lifetime
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JP2002525212A (ja) * | 1998-09-12 | 2002-08-13 | イギリス国 | マイクロ装置でのブリッジの形成 |
JP2002043311A (ja) * | 2000-07-18 | 2002-02-08 | Applied Materials Inc | 半導体装置の製造方法及び装置 |
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JP3290339B2 (ja) | 2002-06-10 |
TW279245B (ja) | 1996-06-21 |
US5563105A (en) | 1996-10-08 |
EP0704885B1 (en) | 2005-12-21 |
DE69534699D1 (de) | 2006-01-26 |
DE69534699T2 (de) | 2006-07-20 |
EP0704885A2 (en) | 1996-04-03 |
EP0704885A3 (en) | 1997-11-26 |
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EXPY | Cancellation because of completion of term |