JP2013131782A - 銅柱バンプ上の金属間化合物の接合のための方法と構造 - Google Patents
銅柱バンプ上の金属間化合物の接合のための方法と構造 Download PDFInfo
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- JP2013131782A JP2013131782A JP2013076744A JP2013076744A JP2013131782A JP 2013131782 A JP2013131782 A JP 2013131782A JP 2013076744 A JP2013076744 A JP 2013076744A JP 2013076744 A JP2013076744 A JP 2013076744A JP 2013131782 A JP2013131782 A JP 2013131782A
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- Prior art keywords
- layer
- copper
- diffusion barrier
- intermetallic compound
- barrier layer
- 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
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- 239000010949 copper Substances 0.000 title claims abstract description 104
- 229910052802 copper Inorganic materials 0.000 title claims abstract description 95
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 title claims abstract description 89
- 229910000765 intermetallic Inorganic materials 0.000 title claims abstract description 63
- 238000000034 method Methods 0.000 title claims abstract description 37
- 229910000679 solder Inorganic materials 0.000 claims abstract description 46
- 230000004888 barrier function Effects 0.000 claims abstract description 37
- 238000009792 diffusion process Methods 0.000 claims abstract description 36
- 239000010936 titanium Substances 0.000 claims abstract description 10
- 229910052751 metal Inorganic materials 0.000 claims abstract description 7
- 239000002184 metal Substances 0.000 claims abstract description 7
- 229910052719 titanium Inorganic materials 0.000 claims abstract description 7
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims abstract description 6
- 230000015572 biosynthetic process Effects 0.000 claims abstract description 3
- 238000000151 deposition Methods 0.000 claims abstract 7
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims description 47
- 229910052759 nickel Inorganic materials 0.000 claims description 18
- 239000010931 gold Substances 0.000 claims description 5
- 239000004065 semiconductor Substances 0.000 claims description 5
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 claims description 4
- 229910052737 gold Inorganic materials 0.000 claims description 4
- BHEPBYXIRTUNPN-UHFFFAOYSA-N hydridophosphorus(.) (triplet) Chemical compound [PH] BHEPBYXIRTUNPN-UHFFFAOYSA-N 0.000 claims description 4
- HBVFXTAPOLSOPB-UHFFFAOYSA-N nickel vanadium Chemical compound [V].[Ni] HBVFXTAPOLSOPB-UHFFFAOYSA-N 0.000 claims description 4
- 238000010438 heat treatment Methods 0.000 abstract 1
- 239000010410 layer Substances 0.000 description 66
- 230000008569 process Effects 0.000 description 18
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 9
- 239000000463 material Substances 0.000 description 5
- 239000010409 thin film Substances 0.000 description 5
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 4
- 238000000137 annealing Methods 0.000 description 4
- 230000008859 change Effects 0.000 description 4
- 229910052710 silicon Inorganic materials 0.000 description 4
- 239000010703 silicon Substances 0.000 description 4
- 239000000758 substrate Substances 0.000 description 4
- VRUVRQYVUDCDMT-UHFFFAOYSA-N [Sn].[Ni].[Cu] Chemical compound [Sn].[Ni].[Cu] VRUVRQYVUDCDMT-UHFFFAOYSA-N 0.000 description 3
- 238000007772 electroless plating Methods 0.000 description 3
- 238000009713 electroplating Methods 0.000 description 3
- OFNHPGDEEMZPFG-UHFFFAOYSA-N phosphanylidynenickel Chemical compound [P].[Ni] OFNHPGDEEMZPFG-UHFFFAOYSA-N 0.000 description 3
- 229920002120 photoresistant polymer Polymers 0.000 description 3
- 239000011241 protective layer Substances 0.000 description 3
- 229910017482 Cu 6 Sn 5 Inorganic materials 0.000 description 2
- 229910017755 Cu-Sn Inorganic materials 0.000 description 2
- 229910017927 Cu—Sn Inorganic materials 0.000 description 2
- 229910020816 Sn Pb Inorganic materials 0.000 description 2
- 229910020922 Sn-Pb Inorganic materials 0.000 description 2
- 229910007637 SnAg Inorganic materials 0.000 description 2
- 229910007638 SnAgSb Inorganic materials 0.000 description 2
- 229910008433 SnCU Inorganic materials 0.000 description 2
- 229910007116 SnPb Inorganic materials 0.000 description 2
- 229910005728 SnZn Inorganic materials 0.000 description 2
- -1 SnZnIn Inorganic materials 0.000 description 2
- 229910018731 Sn—Au Inorganic materials 0.000 description 2
- 229910018956 Sn—In Inorganic materials 0.000 description 2
- 229910008783 Sn—Pb Inorganic materials 0.000 description 2
- QCEUXSAXTBNJGO-UHFFFAOYSA-N [Ag].[Sn] Chemical compound [Ag].[Sn] QCEUXSAXTBNJGO-UHFFFAOYSA-N 0.000 description 2
- WRAOBLMTWFEINP-UHFFFAOYSA-N [Sn].[Ag].[Ni] Chemical compound [Sn].[Ag].[Ni] WRAOBLMTWFEINP-UHFFFAOYSA-N 0.000 description 2
- 229910052738 indium Inorganic materials 0.000 description 2
- CLDVQCMGOSGNIW-UHFFFAOYSA-N nickel tin Chemical compound [Ni].[Sn] CLDVQCMGOSGNIW-UHFFFAOYSA-N 0.000 description 2
- 238000005476 soldering Methods 0.000 description 2
- 239000011800 void material Substances 0.000 description 2
- 229910000881 Cu alloy Inorganic materials 0.000 description 1
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- 241000237509 Patinopecten sp. Species 0.000 description 1
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 1
- 229910020836 Sn-Ag Inorganic materials 0.000 description 1
- 229910020888 Sn-Cu Inorganic materials 0.000 description 1
- 229910020988 Sn—Ag Inorganic materials 0.000 description 1
- 229910019204 Sn—Cu Inorganic materials 0.000 description 1
- 229910001080 W alloy Inorganic materials 0.000 description 1
- PQIJHIWFHSVPMH-UHFFFAOYSA-N [Cu].[Ag].[Sn] Chemical compound [Cu].[Ag].[Sn] PQIJHIWFHSVPMH-UHFFFAOYSA-N 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 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
- WPPDFTBPZNZZRP-UHFFFAOYSA-N aluminum copper Chemical compound [Al].[Cu] WPPDFTBPZNZZRP-UHFFFAOYSA-N 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- MSNOMDLPLDYDME-UHFFFAOYSA-N gold nickel Chemical compound [Ni].[Au] MSNOMDLPLDYDME-UHFFFAOYSA-N 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 238000007747 plating Methods 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 235000020637 scallop Nutrition 0.000 description 1
- 229910052709 silver Inorganic materials 0.000 description 1
- 239000004332 silver Substances 0.000 description 1
- 230000007480 spreading Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- MAKDTFFYCIMFQP-UHFFFAOYSA-N titanium tungsten Chemical compound [Ti].[W] MAKDTFFYCIMFQP-UHFFFAOYSA-N 0.000 description 1
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Abstract
【解決手段】本方法は、金属線層上にチタン含有シード層を形成するステップ、銅含有柱層を形成するステップ、前記銅含有柱層上に拡散バリア層を堆積するステップ、及び前記拡散バリア層上に金属間化合物(IMC)を形成するステップを含む。前記金属間化合物の形成は、前記拡散バリア層上に銅含有キャップ層を堆積するステップ、前記銅含有キャップ層上にはんだ層を堆積するステップ、前記金属間化合物を形成するために前記銅含有キャップ層と前記はんだ層を熱処理するステップ、及び前記金属間化合物の厚さを決定するために前記銅含有キャップ層の厚さを制御するステップを含む。
【選択図】 図1
Description
103 金属線層
104 保護層
106 シード層
108 銅柱
110 拡散バリア層
112 銅キャップ層
114 はんだ層
116 金属間化合物層
202 フォトレジスト層
204 プリント回路板(PCB)
206 導電層
208 拡散バリア層
210 金属間化合物層
Claims (14)
- 金属線層上にチタン含有シード層を形成するステップ、
銅含有柱層を形成するステップ、
前記銅含有柱層上に拡散バリア層を堆積するステップ、及び
前記拡散バリア層上に金属間化合物(IMC)を形成するステップを含み、
前記金属間化合物の形成は、
前記拡散バリア層上に銅含有キャップ層を堆積するステップ、
前記銅含有キャップ層上にはんだ層を堆積するステップ、
前記金属間化合物を形成するために前記銅含有キャップ層と前記はんだ層を熱処理するステップ、及び
前記金属間化合物の厚さを決定するために前記銅含有キャップ層の厚さを制御するステップを含む、柱構造を形成する方法。 - 前記銅含有キャップ層は0.1μm〜1.5μmの厚さに堆積される請求項1に記載の方法。
- 前記金属間化合物を形成する前に前記拡散バリア層の上部に約0.01μm〜0.1μmの厚さで金を堆積するステップを更に含む請求項1又は2に記載の方法。
- 前記拡散バリア層は、ニッケル、ニッケルリンNi(P)、ニッケルバナジウムNi(V)、またはそれらの組み合わせを含む請求項1から3のいずれか1項に記載の方法。
- 前記拡散バリア層は0.5μm〜4μmの厚さに堆積される請求項1から4のいずれか1項に記載の方法。
- 前記銅含有柱層は30μm〜150μmの厚さに堆積される請求項1から5のいずれか1項に記載の方法。
- チタン含有シード層、
銅含有柱層、
前記銅含有柱層上の拡散バリア層、
前記拡散バリア層上の金属間化合物(IMC)、及び
前記金属間化合物上のはんだ層を含み、
前記はんだ層は8μmより大きい厚さを有する、柱構造。 - 前記拡散バリア層は、ニッケル、ニッケルリンNi(P)、ニッケルバナジウムNi(V)、またはそれらの組み合わせを含む請求項7に記載の柱構造。
- 前記拡散バリア層は0.5μm〜4μmの厚さを持つ請求項7又は8に記載の柱構造。
- 前記銅含有柱層は30μm〜150μmの厚さを持つ請求項7から9のいずれか1項に記載の柱構造。
- プリント回路板、及び
前記プリント回路板とフリップチップ接合され、柱構造を有する半導体ウエハを含み、前記柱構造は、
チタン含有シード層、
銅含有柱層、
前記銅含有柱層上の拡散バリア層、
前記拡散バリア層上の金属間化合物(IMC)、及び
前記プリント回路板とフリップチップ接合するはんだ層を含み、
前記はんだ層は8μmより大きい厚さを有する、フリップチップボンディング構造。 - 前記拡散バリア層は、ニッケル、ニッケルリンNi(P)、ニッケルバナジウムNi(V)、またはそれらの組み合わせを含む請求項11に記載のフリップチップボンディング構造。
- 前記拡散バリア層は0.5μm〜4μmの厚さを持つ請求項11又は12に記載のフリップチップボンディング構造。
- 前記銅含有柱層は30μm〜150μmの厚さを持つ請求項11から13のいずれか1項に記載のフリップチップボンディング構造。
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