JP2017157788A - 半導体装置の製造方法 - Google Patents
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- 238000004519 manufacturing process Methods 0.000 title claims abstract description 31
- 239000004065 semiconductor Substances 0.000 title claims abstract description 24
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims abstract description 46
- 229910052710 silicon Inorganic materials 0.000 claims abstract description 46
- 239000010703 silicon Substances 0.000 claims abstract description 46
- 230000015572 biosynthetic process Effects 0.000 claims abstract description 44
- 238000005468 ion implantation Methods 0.000 claims abstract description 26
- 239000000758 substrate Substances 0.000 claims abstract description 25
- 239000012535 impurity Substances 0.000 claims description 34
- 238000000034 method Methods 0.000 claims description 27
- 238000005530 etching Methods 0.000 claims description 19
- 229910021420 polycrystalline silicon Inorganic materials 0.000 claims description 8
- 229920005591 polysilicon Polymers 0.000 claims description 8
- 238000000059 patterning Methods 0.000 claims description 6
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 description 11
- 229910052796 boron Inorganic materials 0.000 description 11
- 150000002500 ions Chemical class 0.000 description 6
- 230000035945 sensitivity Effects 0.000 description 6
- 150000004767 nitrides Chemical class 0.000 description 5
- 238000002513 implantation Methods 0.000 description 4
- 238000002955 isolation Methods 0.000 description 3
- 229920002120 photoresistant polymer Polymers 0.000 description 3
- 229910052581 Si3N4 Inorganic materials 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical group O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 239000007772 electrode material Substances 0.000 description 2
- 230000035515 penetration Effects 0.000 description 2
- HQVNEWCFYHHQES-UHFFFAOYSA-N silicon nitride Chemical compound N12[Si]34N5[Si]62N3[Si]51N64 HQVNEWCFYHHQES-UHFFFAOYSA-N 0.000 description 2
- 229910052814 silicon oxide Inorganic materials 0.000 description 2
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000004913 activation Effects 0.000 description 1
- 238000000137 annealing Methods 0.000 description 1
- 229910052787 antimony Inorganic materials 0.000 description 1
- WATWJIUSRGPENY-UHFFFAOYSA-N antimony atom Chemical compound [Sb] WATWJIUSRGPENY-UHFFFAOYSA-N 0.000 description 1
- 229910052785 arsenic Inorganic materials 0.000 description 1
- RQNWIZPPADIBDY-UHFFFAOYSA-N arsenic atom Chemical compound [As] RQNWIZPPADIBDY-UHFFFAOYSA-N 0.000 description 1
- 230000002238 attenuated effect Effects 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 230000005684 electric field Effects 0.000 description 1
- 230000001771 impaired effect Effects 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 239000012466 permeate Substances 0.000 description 1
- 229910052698 phosphorus Inorganic materials 0.000 description 1
- 239000011574 phosphorus Substances 0.000 description 1
- 229920001296 polysiloxane Polymers 0.000 description 1
- 238000002834 transmittance Methods 0.000 description 1
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Abstract
【解決手段】MOSトランジスタのゲート電極6形成後、受光素子形成領域上のゲート酸化膜4を除去し、受光素子形成領域上に新たに熱酸化膜7を形成し、その酸化膜を通して受光素子形成領域にイオン注入を行うことで、浅いpn接合を形成する。
【選択図】図1
Description
次に、図8(b)に示すように、ゲート電極材料であるポリシリコン膜105を堆積し、エッチングによりパターニングして、ゲート電極106を形成する(図8(c))。
その後、受光素子形成領域PDに浅い接合を形成するためのイオン注入を行い、不純物領域108を形成する(図9(d))。
図1及び図2は、第一の実施形態の半導体装置の製造方法を工程順に示した断面図である。
図において、PDは受光素子を形成する受光素子形成領域、TRはPMOSトランジスタを形成するMOSトランジスタ形成領域を表す。
その後、シリコン基板1の全面を熱酸化することによりゲート酸化膜(「第一の熱酸化膜)ともいう)4を形成する。ゲート酸化膜の厚さは、例えば10nmである。
続いて、MOSトランジスタ形成領域TRにp型不純物のイオン注入を行い、LDD(Lightly Doped Drain)領域9を形成する(図2(a))。
本発明の第二の実施形態の製造方法を説明するための工程断面図を図3に示す。図3(a)は図1(d)と同一の工程を示しており、この工程までは第一の実施形態と同様であるため、説明を省略する。ただし、本実施形態では、熱酸化膜7の厚さを第一の実施形態よりも厚く、30nmとしている。
図3(b)の工程の後は、図2(b)以降と同じ工程を経ることにより、PMOSトランジスタと受光素子を同一シリコン表面上に形成することができる。
本発明の第三の実施形態の製造方法を説明するための工程断面図を図4に示す。図4(a)は図2(a)と同一の工程を示しており、この工程までは第一の実施形態と同様であるため、説明を省略する。
以上により、同一シリコン基板上にMOSトランジスタと受光素子を一緒に形成することができる。
例えば、上記各実施形態においては、Nwell領域にPMOSトランジスタと最表面がp型となる受光素子を作製する例を示したが、Pwell領域にNMOSトランジスタと最表面がn型となる受光素子を作製することももちろん可能である。この場合、砒素、リン、アンチモンなどのイオン種を浅いpn接合を形成するためのイオン注入に用いる。
また、上記各実施形態では、イオン注入のイオン種にBF2を用いたが、ボロン単体やボロンを含むクラスターイオン等をイオン注入に用いてもよい。
2 Nwell領域
3 素子分離領域
4 ゲート酸化膜
5 ポリシリコン膜
6 ゲート電極
7 熱酸化膜
8 不純物領域
9 LDD領域
10,10a,10b 絶縁膜
11,11b サイドウォール
12 ソース・ドレイン領域
R マスク層
Claims (7)
- 受光素子形成領域とMOSトランジスタ形成領域とを有するシリコン基板表面にMOSトランジスタのゲート酸化膜となる第一の熱酸化膜を形成する第一の工程と、
前記第一の熱酸化膜上にポリシリコン膜を形成する第二の工程と、
前記ポリシリコン膜をパターニングして、前記MOSトランジスタ形成領域に前記MOSトランジスタのゲート電極を形成する第三の工程と、
前記第一の熱酸化膜のうち前記ゲート電極の下部以外の前記第一の熱酸化膜を除去する第四の工程と、
前記シリコン基板表面に第二の熱酸化膜を形成する第五の工程と、
前記第二の熱酸化膜を通して前記受光素子形成領域に不純物をイオン注入して不純物領域を形成する第六の工程と、
を備えることを特徴とする半導体装置の製造方法。 - 前記第二の熱酸化膜は、前記ゲート電極の上面及び側面にも形成されることを特徴とする請求項1に記載の半導体装置の製造方法。
- 前記イオン注入により前記MOSトランジスタ形成領域にも前記不純物が注入され、前記MOSトランジスタのLDD領域が形成されることを特徴とする請求項1又は2に記載の半導体装置の製造方法。
- 前記第二の熱酸化膜上に絶縁膜を形成する第七の工程と、
前記受光素子形成領域の前記第二の熱酸化膜上にマスク層を形成した状態で異方性エッチングを行い、前記MOSトランジスタのゲート電極の側面上に前記絶縁膜からなるサイドウォールを形成するとともに前記受光素子形成領域上に前記絶縁膜を残存させる第八の工程と、
をさらに備えることを特徴とする請求項1〜3のいずれか一項に記載の半導体装置の製造方法。 - 前記第二の熱酸化膜上に第一の絶縁膜を形成する第七の工程と、
前記第一の絶縁膜上に第二の絶縁膜を形成する第八の工程と、
前記第一の絶縁膜をエッチングストッパとして異方性エッチングを行い、前記MOSトランジスタのゲート電極の側面上に前記第二の絶縁膜からなるサイドウォールを形成する第九の工程と、
をさらに備えることを特徴とする請求項1〜3のいずれか一項に記載の半導体装置の製造方法。 - 前記不純物領域の前記シリコン基板の最表面における不純物濃度が1019cm-3以上であり、前記不純物領域の不純物濃度が1017cm-3以下となる前記シリコン基板表面からの深さが100nm以下であることを特徴とする請求項1〜5のいずれか一項に記載の半導体装置の製造方法。
- 前記第二の熱酸化膜の厚さが30nm以下であることを特徴とする請求項1〜6のいずれか一項に記載の半導体装置の製造方法。
Priority Applications (6)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2016042297A JP6892221B2 (ja) | 2016-03-04 | 2016-03-04 | 半導体装置の製造方法 |
US15/446,680 US10043848B2 (en) | 2016-03-04 | 2017-03-01 | Semiconductor device and a method of manufacturing a semiconductor device |
KR1020170027250A KR102279835B1 (ko) | 2016-03-04 | 2017-03-02 | 반도체 장치 및 반도체 장치의 제조 방법 |
TW106106923A TWI707386B (zh) | 2016-03-04 | 2017-03-03 | 半導體裝置及半導體裝置的製造方法 |
CN201710132974.9A CN107154434A (zh) | 2016-03-04 | 2017-03-06 | 半导体装置和半导体装置的制造方法 |
US16/031,480 US10593724B2 (en) | 2016-03-04 | 2018-07-10 | Method of manufacturing a semiconductor device |
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US10686086B2 (en) | 2017-10-27 | 2020-06-16 | Canon Kabushiki Kaisha | Photoelectric conversion device, manufacturing method thereof, and apparatus |
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US10978571B2 (en) * | 2018-10-24 | 2021-04-13 | International Business Machines Corporation | Self-aligned contact with metal-insulator transition materials |
CN109904115B (zh) * | 2019-03-07 | 2021-01-29 | 上海华力微电子有限公司 | 一种侧墙结构的形成方法 |
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US20180323233A1 (en) | 2018-11-08 |
US10593724B2 (en) | 2020-03-17 |
TW201735120A (zh) | 2017-10-01 |
KR20170103682A (ko) | 2017-09-13 |
US20170256582A1 (en) | 2017-09-07 |
TWI707386B (zh) | 2020-10-11 |
JP6892221B2 (ja) | 2021-06-23 |
CN107154434A (zh) | 2017-09-12 |
US10043848B2 (en) | 2018-08-07 |
KR102279835B1 (ko) | 2021-07-20 |
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