JP5930574B2 - AlCuプロセスのCMOSイメージセンサーの大ビアボンディングパッドのアプリケーション - Google Patents
AlCuプロセスのCMOSイメージセンサーの大ビアボンディングパッドのアプリケーション Download PDFInfo
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- JP5930574B2 JP5930574B2 JP2010170162A JP2010170162A JP5930574B2 JP 5930574 B2 JP5930574 B2 JP 5930574B2 JP 2010170162 A JP2010170162 A JP 2010170162A JP 2010170162 A JP2010170162 A JP 2010170162A JP 5930574 B2 JP5930574 B2 JP 5930574B2
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- 238000000034 method Methods 0.000 title description 74
- 229910016570 AlCu Inorganic materials 0.000 title description 2
- 239000000758 substrate Substances 0.000 claims description 76
- 229910052751 metal Inorganic materials 0.000 claims description 16
- 239000002184 metal Substances 0.000 claims description 16
- 230000002093 peripheral effect Effects 0.000 claims description 14
- 239000004020 conductor Substances 0.000 claims description 10
- 229910000679 solder Inorganic materials 0.000 claims description 5
- 238000005286 illumination Methods 0.000 claims description 4
- 239000010410 layer Substances 0.000 description 94
- 239000004065 semiconductor Substances 0.000 description 24
- 238000004519 manufacturing process Methods 0.000 description 21
- 239000000463 material Substances 0.000 description 12
- 238000002955 isolation Methods 0.000 description 10
- 238000002161 passivation Methods 0.000 description 9
- 230000005855 radiation Effects 0.000 description 9
- 230000015572 biosynthetic process Effects 0.000 description 8
- 238000005229 chemical vapour deposition Methods 0.000 description 7
- 238000000059 patterning Methods 0.000 description 6
- 238000005240 physical vapour deposition Methods 0.000 description 6
- 238000000231 atomic layer deposition Methods 0.000 description 5
- 239000011229 interlayer Substances 0.000 description 5
- 239000000203 mixture Substances 0.000 description 5
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 4
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 4
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 4
- 229910052802 copper Inorganic materials 0.000 description 4
- 239000010949 copper Substances 0.000 description 4
- 239000003989 dielectric material Substances 0.000 description 4
- 239000002019 doping agent Substances 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- 238000011049 filling Methods 0.000 description 4
- 239000010703 silicon Substances 0.000 description 4
- 229910052814 silicon oxide Inorganic materials 0.000 description 4
- 229910052581 Si3N4 Inorganic materials 0.000 description 3
- NRTOMJZYCJJWKI-UHFFFAOYSA-N Titanium nitride Chemical compound [Ti]#N NRTOMJZYCJJWKI-UHFFFAOYSA-N 0.000 description 3
- 229910052782 aluminium Inorganic materials 0.000 description 3
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 3
- 239000011521 glass Substances 0.000 description 3
- 238000002513 implantation Methods 0.000 description 3
- 229910052710 silicon Inorganic materials 0.000 description 3
- HQVNEWCFYHHQES-UHFFFAOYSA-N silicon nitride Chemical compound N12[Si]34N5[Si]62N3[Si]51N64 HQVNEWCFYHHQES-UHFFFAOYSA-N 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 description 3
- 229910052721 tungsten Inorganic materials 0.000 description 3
- 239000010937 tungsten Substances 0.000 description 3
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 description 2
- 229910000881 Cu alloy Inorganic materials 0.000 description 2
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 2
- 229910052785 arsenic Inorganic materials 0.000 description 2
- RQNWIZPPADIBDY-UHFFFAOYSA-N arsenic atom Chemical compound [As] RQNWIZPPADIBDY-UHFFFAOYSA-N 0.000 description 2
- 229910052796 boron Inorganic materials 0.000 description 2
- 239000003086 colorant Substances 0.000 description 2
- 238000001312 dry etching Methods 0.000 description 2
- 238000005530 etching Methods 0.000 description 2
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 2
- 239000010931 gold Substances 0.000 description 2
- 229910052737 gold Inorganic materials 0.000 description 2
- BHEPBYXIRTUNPN-UHFFFAOYSA-N hydridophosphorus(.) (triplet) Chemical compound [PH] BHEPBYXIRTUNPN-UHFFFAOYSA-N 0.000 description 2
- 238000004377 microelectronic Methods 0.000 description 2
- 230000003287 optical effect Effects 0.000 description 2
- 238000001020 plasma etching Methods 0.000 description 2
- 238000007517 polishing process Methods 0.000 description 2
- 229910021420 polycrystalline silicon Inorganic materials 0.000 description 2
- 229920005591 polysilicon Polymers 0.000 description 2
- 239000000523 sample Substances 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 229910021332 silicide Inorganic materials 0.000 description 2
- FVBUAEGBCNSCDD-UHFFFAOYSA-N silicide(4-) Chemical compound [Si-4] FVBUAEGBCNSCDD-UHFFFAOYSA-N 0.000 description 2
- 229910052719 titanium Inorganic materials 0.000 description 2
- 239000010936 titanium Substances 0.000 description 2
- 238000001039 wet etching Methods 0.000 description 2
- 229910000676 Si alloy Inorganic materials 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- WPPDFTBPZNZZRP-UHFFFAOYSA-N aluminum copper Chemical compound [Al].[Cu] WPPDFTBPZNZZRP-UHFFFAOYSA-N 0.000 description 1
- 238000000137 annealing Methods 0.000 description 1
- 230000000295 complement effect Effects 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 229910003460 diamond Inorganic materials 0.000 description 1
- 239000010432 diamond Substances 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 229910052732 germanium Inorganic materials 0.000 description 1
- GNPVGFCGXDBREM-UHFFFAOYSA-N germanium atom Chemical compound [Ge] GNPVGFCGXDBREM-UHFFFAOYSA-N 0.000 description 1
- 239000011810 insulating material Substances 0.000 description 1
- 239000012212 insulator Substances 0.000 description 1
- 238000005224 laser annealing Methods 0.000 description 1
- 229910044991 metal oxide Inorganic materials 0.000 description 1
- 150000004706 metal oxides Chemical class 0.000 description 1
- 150000004767 nitrides Chemical class 0.000 description 1
- 238000000206 photolithography Methods 0.000 description 1
- 239000000049 pigment Substances 0.000 description 1
- 238000007747 plating Methods 0.000 description 1
- 238000005498 polishing Methods 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 239000011241 protective layer Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 239000002210 silicon-based material Substances 0.000 description 1
- 238000004544 sputter deposition Methods 0.000 description 1
- 229910052715 tantalum Inorganic materials 0.000 description 1
- GUVRBAGPIYLISA-UHFFFAOYSA-N tantalum atom Chemical compound [Ta] GUVRBAGPIYLISA-UHFFFAOYSA-N 0.000 description 1
- MZLGASXMSKOWSE-UHFFFAOYSA-N tantalum nitride Chemical compound [Ta]#N MZLGASXMSKOWSE-UHFFFAOYSA-N 0.000 description 1
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Description
より詳しくは、裏面照射型(BSI)イメージセンサーは、ボンディングパッド領域と、周辺領域と画素領域を有する非ボンディングパッド領域を有し、且つ、表面と裏面を有する第一基板と、ボンディングパッド領域の第一基板の表面の第一導電線であって、この第一導電線は、ボンディングパッドであることと、非ボンディングパッド領域の第一基板の前記表面の第二導電線と、第一導電線上に、第一直径を有する第一ビアであって、第一導電線のサイズは、前記第一ビアに十分に近いことと、第二導電線上に、それぞれが第二直径を有する複数の第二ビアと、を備え、第一直径は、第二直径より大きく、且つ、複数の第二ビアは、非ボンディングパッド領域の周辺領域と画素領域における基板上に形成され、且つ、第一ビアと第二ビアは、当該BSIイメージセンサーの表面上に形成された誘電層に形成された開口に充填された導電材料から構成される。
これは、ボンディングパッド65Dは比較的薄く、ボンディングパッド65Dは、ボールボンディングプロセス中に生じうるストレスに対する十分な機械的支持を提供しない程度のもので、その後、ボンディングワイヤ165とボンディングパッド65D間の接着力が弱くなるおそれがあるという事実による。別の問題は、ボンディングパッドの剥離で、ボンディングパッド65Dが小ビアアレイから剥がれ落ちるおそれがあることを意味する。ボンディングパッド65Dと小ビア間の不十分なコンタクト表面積のために(各ビアが比較的小さい表面積を有するので)、ボンディングパッド剥離が生じるおそれがある。ボンディングパッド領域56が小ビアを用いることに関連した別の問題は、層間絶縁膜の亀裂である。層間絶縁膜は、小ビアの間に存在する誘電層70の部分に関連する。誘電層70は、通常、酸化ケイ素材料からなり、ガラスと類似する。ボンディングの最中等で、ストレスがかかる時、ボンディングパッド領域56の小ビア間の誘電層70の部分は、ストレスに屈して、亀裂し始める。上記これらの問題の全てが、BSIイメージセンサー装置30の性能と歩留まりに悪影響を及ぼすものである。
その後、ソルダーバンプが加熱され(例えば、オーブンで)、ソルダーバンプが融解、流動し、イメージセンサーのボンディングパッドと外部回路のボンディングパッド間に十分な接合コンタクトを形成し、フリップチップ接合プロセスを完成する。
13、15、17、19 ステップ
30 BSIイメージセンサー装置
32 装置基板
34 表面
36 裏面
38 初期厚さ
40、42、182、184 画素
43 光
47、49、185、186 分離構造
52 画素領域
54 周辺領域
56 ボンディングパッド領域
60、61 微小電子装置
65、120、190、235 導電層
65A〜65D、120A〜120D、190A〜190D、235A、235B 導電線
68、95、100、124、150、212、215、238、250 幅
70、125、192、240 誘電層
75 パターン化プロセス
80、82、84、86、88、90、92、145、200、205、210、245 開口
102、104、106、108、110、112、115、220、225、230 ビア
128 パッシベーション層
130 キャリア基板
135 薄膜化プロセス
140 厚さ
142、242 保護層
154、254 カラーフィルター層
154A、154B、254A、254B カラーフィルター
160、260 マイクロレンズ層
165、265 ボンディングワイヤ
170、270 ボンディングボール
175、275 間隔距離
180 FSIイメージセンサー装置
Claims (5)
- ボンディングパッド領域と、周辺領域と画素領域を有する非ボンディングパッド領域を有し、且つ、表面と裏面を有する第一基板と、
前記ボンディングパッド領域の前記第一基板の前記表面の第一導電線であって、この第一導電線は、ボンディングパッドであることと、
前記非ボンディングパッド領域の前記第一基板の前記表面の第二導電線と、
前記第一導電線上に、第一直径を有する第一ビアであって、前記第一導電線のサイズは、前記第一ビアに十分に近いことと、
前記第二導電線上に、それぞれが第二直径を有する複数の第二ビアと、を備えた裏面照射型(BSI)イメージセンサーにおいて、
前記第一直径は、前記第二直径より大きく、且つ、前記複数の第二ビアは、前記非ボンディングパッド領域の前記周辺領域と前記画素領域における前記基板上に形成され、且つ、前記第一ビアと前記第二ビアは、当該BSIイメージセンサーの表面上に形成された誘電層に形成された開口に充填された導電材料から構成されることを特徴とする裏面照射型(BSI)イメージセンサー。 - 前記第一及び第二導電線は、第一金属層に形成されることを特徴とする請求項1に記載のBSIイメージセンサー。
- 前記非ボンディングパッド領域は、少なくとも一つのイメージセンサーを有する画素領域を備えることを特徴とする請求項1に記載のBSIイメージセンサー。
- 更に、前記第一基板の前記裏面から、前記第一導電線に接合されるソルダーバンプを有することを特徴とする請求項1に記載のBSIイメージセンサー。
- 前記第一直径は30〜200umに及び、前記第二直径は0.1〜0.5umに及ぶことを特徴とする請求項1に記載のBSIイメージセンサー。
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US12/511,789 | 2009-07-29 | ||
US12/511,789 US8344471B2 (en) | 2009-07-29 | 2009-07-29 | CMOS image sensor big via bonding pad application for AICu process |
US12/616,652 US8502335B2 (en) | 2009-07-29 | 2009-11-11 | CMOS image sensor big via bonding pad application for AlCu Process |
US12/616,652 | 2009-11-11 |
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