JP2009541990A - 背面照射型フォトダイオードを用いたイメージセンサ及びその製造方法 - Google Patents
背面照射型フォトダイオードを用いたイメージセンサ及びその製造方法 Download PDFInfo
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- 238000004519 manufacturing process Methods 0.000 title claims abstract description 20
- 238000000034 method Methods 0.000 title claims description 24
- 235000012431 wafers Nutrition 0.000 claims description 75
- 239000002184 metal Substances 0.000 claims description 53
- 238000005036 potential barrier Methods 0.000 claims description 46
- 230000015572 biosynthetic process Effects 0.000 claims description 24
- 239000010453 quartz Substances 0.000 claims description 15
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 15
- 238000002161 passivation Methods 0.000 claims description 12
- 239000012535 impurity Substances 0.000 claims description 8
- 238000010438 heat treatment Methods 0.000 claims description 7
- 238000005468 ion implantation Methods 0.000 claims description 5
- 230000008021 deposition Effects 0.000 claims description 4
- 239000000758 substrate Substances 0.000 abstract description 8
- 230000035945 sensitivity Effects 0.000 abstract description 7
- 239000005388 borosilicate glass Substances 0.000 description 4
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 3
- 230000007547 defect Effects 0.000 description 3
- 238000005530 etching Methods 0.000 description 3
- 229910052710 silicon Inorganic materials 0.000 description 3
- 239000010703 silicon Substances 0.000 description 3
- 239000004065 semiconductor Substances 0.000 description 2
- 238000004381 surface treatment Methods 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
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- H—ELECTRICITY
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- H01L27/144—Devices controlled by radiation
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Abstract
Description
また、光は、背面照射型フォトダイオードの背面を介して吸収されるため、感度が著しく改善して、クロストークも抑制できる。
11 第1のウエハ
12 第2のウエハ
20 エピタキシャル層(エピ層)
30 ポテンシャルバリア
40 背面照射型フォトダイオード
50 金属間絶縁膜
60、61 金属配線
70 パッド
75 ビア及びプラグ
80 パッシベーション膜
82 カラーフィルタ
84 マイクロレンズ
90 メタルボンディングパッド
92 ロジック領域のトランジスタ
95 第1のクォーツ
96 第2のクォーツ
S110、S210 ポテンシャルバリア形成ステップ
S120、S220 背面除去ステップ
S130、S230 背面照射型フォトダイオード形成ステップ
S140、S240 金属配線形成ステップ
S150、S280 カラーフィルタ形成ステップ
S160、S250 ビア&プラグ形成ステップ
S170、S290 パッド形成ステップ
S260 ロジック回路形成ステップ
S270 ウエハ接合ステップ
Claims (7)
- 背面照射型フォトダイオードを用いたイメージセンサであって、
所定のタイプの第1のウエハ及び第2のウエハに低濃度の不純物がドーピングされて形成されたエピ層と、
第1のウエハのエピ層の表面に形成されたポテンシャルバリアと、
第1のウエハの背面のエピ層に形成された背面照射型フォトダイオードと、
ロジック回路が形成された第2のウエハと、
第1のウエハに形成された背面照射型フォトダイオードに接続された金属配線および、第2のウエハに形成されたロジック回路と接続された金属配線を電気的に接続する金属接合部と、
第1のウエハのポテンシャルバリア上に形成され、イメージセンサの外部回路と電気的に接続されるパッドと、
パッドおよび第2のウエハのロジック回路が電気的に接続するように、第1のウエハのエピ層を貫通して形成されたビア及び該ビアを充填するプラグと、を備えるイメージセンサ。 - ポテンシャルバリア上に形成されたパッシベーション膜と、
パッシベーション膜上に形成されたカラーフィルタと、
カラーフィルタ上に形成されたマイクロレンズと、をさらに備える請求項1に記載のイメージセンサ。 - ポテンシャルバリアは、エピ層と同一のタイプを有し、前記エピ層よりも相対的に高い濃度の不純物がドーピングされている請求項1に記載のイメージセンサ。
- イメージセンサの製造方法であって、
(a)所定のタイプの第1および第2のウエハに低濃度のエピ層を形成し、第1のウエハのエピ層の表面にポテンシャルバリアを形成するステップと、
(b)第1のウエハのエピ層を除いた背面を除去するステップと、
(c)ステップ(b)で露出したエピ層の表面に背面照射型フォトダイオードを形成するステップと、
(d)該背面照射型フォトダイオード上に金属間絶縁膜を形成し、該金属間絶縁膜の内部に金属配線を形成するステップと、
(e)ポテンシャルバリアの表面からエピ層を貫通して該金属配線に接続されたビアを形成し、該ビアにプラグを充填するステップと、
(f)第2のウエハに形成されたエピ層上に金属間絶縁膜を形成し、該金属間絶縁膜の内部に金属配線を含むロジック回路を形成するステップと、
(g)金属接合により、第1のウエハの金属配線と第2のウエハのロジック回路の金属配線とを接続するステップと、
(h)ポテンシャルバリアの表面に、パッシベーション膜、カラーフィルタ及びマイクロレンズを形成するステップと、
(i)第1のウエハのプラグで充填されたビアの表面にパッドを形成するステップと、を含む方法。 - ステップ(b)の前又は後に、第1のクォーツをエピ層の表面に接合するステップと、
ステップ(h)の前に、第1のクォーツを除去するステップと、をさらに含む請求項4に記載の方法。 - ポテンシャルバリアは、イオン注入、エピ成長およびBSG蒸着からなるグループから選ばれる少なくとも1つの方法を用いて形成される請求項4に記載の方法。
- ステップ(a)において、第1のウエハのポテンシャルバリアの形成後、熱処理によって、ポテンシャルバリアが形成されたエピ層の表面状態を安定化させる請求項4に記載の方法。
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
KR10-2006-0054767 | 2006-06-19 | ||
KR1020060054767A KR100801447B1 (ko) | 2006-06-19 | 2006-06-19 | 배면 광 포토다이오드를 이용한 이미지센서 및 그 제조방법 |
PCT/KR2007/002876 WO2007148891A1 (en) | 2006-06-19 | 2007-06-14 | Image sensor using back-illuminated photodiode and method of manufacturing the same |
Publications (2)
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JP2009541990A true JP2009541990A (ja) | 2009-11-26 |
JP5009368B2 JP5009368B2 (ja) | 2012-08-22 |
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Application Number | Title | Priority Date | Filing Date |
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JP2009516393A Active JP5009368B2 (ja) | 2006-06-19 | 2007-06-14 | 背面照射型フォトダイオードを用いたイメージセンサの製造方法 |
Country Status (6)
Country | Link |
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US (1) | US7714403B2 (ja) |
EP (1) | EP2030239B1 (ja) |
JP (1) | JP5009368B2 (ja) |
KR (1) | KR100801447B1 (ja) |
CN (1) | CN101473440B (ja) |
WO (1) | WO2007148891A1 (ja) |
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KR100801447B1 (ko) | 2008-02-11 |
CN101473440B (zh) | 2011-05-11 |
US7714403B2 (en) | 2010-05-11 |
KR20070120255A (ko) | 2007-12-24 |
EP2030239A4 (en) | 2012-07-25 |
WO2007148891A1 (en) | 2007-12-27 |
EP2030239B1 (en) | 2015-08-12 |
CN101473440A (zh) | 2009-07-01 |
JP5009368B2 (ja) | 2012-08-22 |
US20090224345A1 (en) | 2009-09-10 |
EP2030239A1 (en) | 2009-03-04 |
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