JP7354937B2 - 半導体装置およびその製造方法 - Google Patents
半導体装置およびその製造方法 Download PDFInfo
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- 239000004065 semiconductor Substances 0.000 title claims description 65
- 238000004519 manufacturing process Methods 0.000 title claims description 13
- 238000002955 isolation Methods 0.000 claims description 61
- 239000012535 impurity Substances 0.000 claims description 33
- 239000000758 substrate Substances 0.000 claims description 31
- 239000002344 surface layer Substances 0.000 claims description 16
- 238000005468 ion implantation Methods 0.000 claims description 12
- 238000010438 heat treatment Methods 0.000 claims description 5
- 239000010410 layer Substances 0.000 description 64
- 229910021332 silicide Inorganic materials 0.000 description 23
- FVBUAEGBCNSCDD-UHFFFAOYSA-N silicide(4-) Chemical compound [Si-4] FVBUAEGBCNSCDD-UHFFFAOYSA-N 0.000 description 23
- 238000000926 separation method Methods 0.000 description 17
- 238000000034 method Methods 0.000 description 12
- 230000003321 amplification Effects 0.000 description 11
- 238000003199 nucleic acid amplification method Methods 0.000 description 11
- 150000002500 ions Chemical class 0.000 description 4
- 230000004048 modification Effects 0.000 description 4
- 238000012986 modification Methods 0.000 description 4
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 3
- 239000013078 crystal Substances 0.000 description 3
- 230000007547 defect Effects 0.000 description 3
- 238000009792 diffusion process Methods 0.000 description 3
- 230000001012 protector Effects 0.000 description 3
- 229910052710 silicon Inorganic materials 0.000 description 3
- 239000010703 silicon Substances 0.000 description 3
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 description 2
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 2
- 229910052796 boron Inorganic materials 0.000 description 2
- AIOWANYIHSOXQY-UHFFFAOYSA-N cobalt silicon Chemical compound [Si].[Co] AIOWANYIHSOXQY-UHFFFAOYSA-N 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- 230000002093 peripheral effect Effects 0.000 description 2
- 229910052698 phosphorus Inorganic materials 0.000 description 2
- 239000011574 phosphorus Substances 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 229910052581 Si3N4 Inorganic materials 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 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
- 229910052785 arsenic Inorganic materials 0.000 description 1
- RQNWIZPPADIBDY-UHFFFAOYSA-N arsenic atom Chemical compound [As] RQNWIZPPADIBDY-UHFFFAOYSA-N 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 230000005684 electric field Effects 0.000 description 1
- 239000011810 insulating material Substances 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 239000012212 insulator Substances 0.000 description 1
- 239000011229 interlayer Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000005192 partition Methods 0.000 description 1
- 238000005498 polishing Methods 0.000 description 1
- HQVNEWCFYHHQES-UHFFFAOYSA-N silicon nitride Chemical compound N12[Si]34N5[Si]62N3[Si]51N64 HQVNEWCFYHHQES-UHFFFAOYSA-N 0.000 description 1
- 229910052814 silicon oxide Inorganic materials 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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Description
主面(10a)を有する半導体基板(10)と、
半導体基板において、主面側の表層に形成された第1導電型のベース領域(30)と、
ベース領域の表層に形成された、第1導電型とは逆の第2導電型のエミッタ領域(31)と、
主面側の表層において、エミッタ領域とは離れて形成された第2導電型のコレクタ領域(32)と、
主面に形成され、ベース領域とエミッタ領域との接合界面が接する熱酸化膜(402b)を有する素子分離絶縁膜(40、402)と、を備え、
ベース領域は、エミッタ領域を内包する第1領域(301)と、第1領域からコレクタ領域側に延び、第1領域よりも不純物濃度が高い第2領域(302)を有し、
第2領域は、主面を基準とする深さが第1領域よりも浅い。
半導体基板(10)の主面(10a)に、熱酸化膜(402b)を有する素子分離絶縁膜(40、402)を形成し、
ベース領域(30、301)およびエミッタ領域(31)を形成するために、共通のフォトマスクを用いて、素子分離絶縁膜の開口部(40b)から露出する部分に、第1導電型の不純物をイオン注入し、次いで第1導電型とは逆の第2導電型の不純物をイオン注入し、
熱処理により不純物を拡散させて、ベース領域とエミッタ領域との接合界面が熱酸化膜に接するように、ベース領域およびエミッタ領域を形成する。
本実施形態では、npn型のバイポーラトランジスタが形成された半導体装置について説明する。p型が第1導電型に相当し、n型が第2導電型に相当する。
図1、図2、および図3に基づき、半導体装置の概略構造について説明する。図1は、半導体装置の平面図である。図1は、ベース領域、エミッタ領域、およびコレクタ領域と、STI分離部との位置関係を示している。図1では、便宜上、シリサイド層などの半導体装置の要素の一部を省略している。図1では、明確化のために、STI分離部にハッチングを施している。図2は、図1のII-II線に沿う断面図である。図3は、STI分離部(第2分離部)周辺を示す断面図である。図3では、ベース領域およびエミッタ領域を簡素化して図示している。また、シリサイド層やシリサイドブロック層についても、図示を省略している。
次に、上記した半導体装置100において、ベース領域30およびエミッタ領域31と、STI分離部40との関係について説明する。
次に、図3~図8に基づき、上記した半導体装置100の製造方法について説明する。図4~図8は、図2に対応している。
本実施形態では、半導体基板10の主面10aであって、ベース領域30とエミッタ領域31との境界にSTI分離部40(第2分離部402)を設けている。STI分離部40は、トレンチ402aの表面に熱酸化膜402bを有している。熱酸化膜402bを設けることで、イオン注入等により半導体基板10に生じた結晶欠陥が酸化膜に取り込まれる。
この実施形態は、先行する実施形態を基礎的形態とする変形例であり、先行実施形態の記載を援用できる。先行実施形態では、配線部の配置について特に言及しなかった。これに代えて、ベース領域に接続された配線部とベース領域との位置を所定の関係にしてもよい。
本実施形態では、上記したように、配線部70が、平面視において、ベース領域30におけるコレクタ領域32側の端部30eよりも、コレクタ領域32に対して近い位置まで延設されている。特に、配線部70において、ひとつの配線70a(第1配線)が、他の層の配線(第2配線)よりも、コレクタ領域32側に延びている。配線70aは、他の層の配線よりも、端部30eを基準としてより遠い位置まで延設されている。ベース領域30に接続された配線部70、特に配線70aは、フィールドプレートとして機能する。これにより、電界集中を緩和し、ひいては半導体装置100の耐圧を向上することができる。
この明細書および図面等における開示は、例示された実施形態に制限されない。開示は、例示された実施形態と、それらに基づく当業者による変形態様を包含する。たとえば、開示は、実施形態において示された部品および/または要素の組み合わせに限定されない。開示は、多様な組み合わせによって実施可能である。開示は、実施形態に追加可能な追加的な部分をもつことができる。開示は、実施形態の部品および/または要素が省略されたものを包含する。開示は、ひとつの実施形態と他の実施形態との間における部品および/または要素の置き換え、または組み合わせを包含する。開示される技術的範囲は、実施形態の記載に限定されない。開示されるいくつかの技術的範囲は、請求の範囲の記載によって示され、さらに請求の範囲の記載と均等の意味および範囲内でのすべての変更を含むものと解されるべきである。
Claims (4)
- 主面(10a)を有する半導体基板(10)と、
前記半導体基板において、前記主面側の表層に形成された第1導電型のベース領域(30)と、
前記ベース領域の表層に形成された、前記第1導電型とは逆の第2導電型のエミッタ領域(31)と、
前記主面側の表層において、前記エミッタ領域とは離れて形成された前記第2導電型のコレクタ領域(32)と、
前記主面に形成され、前記ベース領域と前記エミッタ領域との接合界面が接する熱酸化膜(402b)を有する素子分離絶縁膜(40、402)と、を備え、
前記ベース領域は、前記エミッタ領域を内包する第1領域(301)と、前記第1領域から前記コレクタ領域側に延び、前記第1領域よりも不純物濃度が高い第2領域(302)を有し、
前記第2領域は、前記主面を基準とする深さが前記第1領域よりも浅い半導体装置。 - 前記ベース領域と前記エミッタ領域との接合界面は、前記素子分離絶縁膜の底面に接している請求項1に記載の半導体装置。
- 前記半導体基板の前記主面上に配置され、前記ベース領域に電気的に接続された配線部(70)をさらに備え、
前記配線部は、前記半導体基板の板厚方向からの平面視において、前記ベース領域における前記コレクタ領域側の端部(30e)よりも、前記コレクタ領域に対して近い位置まで延設されている請求項1または請求項2に記載の半導体装置。 - 半導体基板(10)の主面(10a)に、熱酸化膜(402b)を有する素子分離絶縁膜(40、402)を形成し、
ベース領域(30、301)およびエミッタ領域(31)を形成するために、共通のフォトマスクを用いて、前記素子分離絶縁膜の開口部(40b)から露出する部分に、第1導電型の不純物をイオン注入し、次いで前記第1導電型とは逆の第2導電型の不純物をイオン注入し、
熱処理により前記不純物を拡散させて、前記ベース領域と前記エミッタ領域との接合界面が前記熱酸化膜に接するように、前記ベース領域および前記エミッタ領域を形成する、半導体装置の製造方法。
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