JP5678528B2 - 半導体光デバイスの製造方法 - Google Patents
半導体光デバイスの製造方法 Download PDFInfo
- Publication number
- JP5678528B2 JP5678528B2 JP2010200266A JP2010200266A JP5678528B2 JP 5678528 B2 JP5678528 B2 JP 5678528B2 JP 2010200266 A JP2010200266 A JP 2010200266A JP 2010200266 A JP2010200266 A JP 2010200266A JP 5678528 B2 JP5678528 B2 JP 5678528B2
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- Prior art keywords
- bcb resin
- optical device
- semiconductor optical
- resin region
- silicon oxide
- 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.)
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- 239000004065 semiconductor Substances 0.000 title claims description 79
- 230000003287 optical effect Effects 0.000 title claims description 63
- 238000004519 manufacturing process Methods 0.000 title claims description 26
- 239000011347 resin Substances 0.000 claims description 125
- 229920005989 resin Polymers 0.000 claims description 125
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 56
- 229910052814 silicon oxide Inorganic materials 0.000 claims description 56
- 239000007789 gas Substances 0.000 claims description 38
- 238000009616 inductively coupled plasma Methods 0.000 claims description 31
- 230000003746 surface roughness Effects 0.000 claims description 17
- 125000004430 oxygen atom Chemical group O* 0.000 claims description 14
- 229910052751 metal Inorganic materials 0.000 claims description 11
- 239000002184 metal Substances 0.000 claims description 11
- 239000011261 inert gas Substances 0.000 claims description 7
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 4
- 229910001873 dinitrogen Inorganic materials 0.000 claims description 4
- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 claims description 3
- 229910001882 dioxygen Inorganic materials 0.000 claims description 3
- 125000004429 atom Chemical group 0.000 claims description 2
- UMIVXZPTRXBADB-UHFFFAOYSA-N benzocyclobutene Chemical compound C1=CC=C2CCC2=C1 UMIVXZPTRXBADB-UHFFFAOYSA-N 0.000 description 104
- 239000010410 layer Substances 0.000 description 46
- 238000000034 method Methods 0.000 description 22
- 238000004381 surface treatment Methods 0.000 description 19
- 238000009832 plasma treatment Methods 0.000 description 9
- 230000006698 induction Effects 0.000 description 7
- 239000000758 substrate Substances 0.000 description 7
- 238000001020 plasma etching Methods 0.000 description 6
- 238000005253 cladding Methods 0.000 description 5
- 229910004298 SiO 2 Inorganic materials 0.000 description 4
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 4
- 239000010936 titanium Substances 0.000 description 4
- 229910052719 titanium Inorganic materials 0.000 description 4
- 229910052799 carbon Inorganic materials 0.000 description 3
- 125000004432 carbon atom Chemical group C* 0.000 description 3
- 238000001312 dry etching Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000005530 etching Methods 0.000 description 3
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 3
- 229910052737 gold Inorganic materials 0.000 description 3
- 239000010931 gold Substances 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- -1 SiO 2 Chemical compound 0.000 description 2
- 238000000089 atomic force micrograph Methods 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 2
- 239000002826 coolant Substances 0.000 description 2
- 150000002500 ions Chemical class 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 230000003071 parasitic effect Effects 0.000 description 2
- 238000000206 photolithography Methods 0.000 description 2
- 229910052697 platinum Inorganic materials 0.000 description 2
- 229910052710 silicon Inorganic materials 0.000 description 2
- KIDDROYEHJYRSO-UHFFFAOYSA-N C(=C)C1(C(C=2C1=CC=CC=2)[SiH2]OC1(C(C=2C1=C(C=CC=2)C)(C)C)C)C=C Chemical compound C(=C)C1(C(C=2C1=CC=CC=2)[SiH2]OC1(C(C=2C1=C(C=CC=2)C)(C)C)C)C=C KIDDROYEHJYRSO-UHFFFAOYSA-N 0.000 description 1
- 229910000530 Gallium indium arsenide Inorganic materials 0.000 description 1
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical group [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- 238000004833 X-ray photoelectron spectroscopy Methods 0.000 description 1
- 229910052786 argon Inorganic materials 0.000 description 1
- 150000001721 carbon Chemical group 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 230000005684 electric field Effects 0.000 description 1
- 230000005672 electromagnetic field Effects 0.000 description 1
- 239000001307 helium Substances 0.000 description 1
- 229910052734 helium Inorganic materials 0.000 description 1
- SWQJXJOGLNCZEY-UHFFFAOYSA-N helium atom Chemical compound [He] SWQJXJOGLNCZEY-UHFFFAOYSA-N 0.000 description 1
- 230000005596 ionic collisions Effects 0.000 description 1
- 230000031700 light absorption Effects 0.000 description 1
- 229910052754 neon Inorganic materials 0.000 description 1
- GKAOGPIIYCISHV-UHFFFAOYSA-N neon atom Chemical compound [Ne] GKAOGPIIYCISHV-UHFFFAOYSA-N 0.000 description 1
- 125000004433 nitrogen atom Chemical group N* 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 238000002161 passivation Methods 0.000 description 1
- 239000002344 surface layer Substances 0.000 description 1
Classifications
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- H01L21/76829—Applying interconnections to be used for carrying current between separate components within a device comprising conductors and dielectrics characterised by the formation and the after-treatment of the dielectrics, e.g. smoothing characterised by the formation of thin functional dielectric layers, e.g. dielectric etch-stop, barrier, capping or liner layers
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Description
(第1実施形態)
まず、図3(a)に示されるように、半導体光素子2上にBCB樹脂を塗布することによって、BCB樹脂層41を形成する。好ましくは、半導体光素子2上に絶縁層12を形成した後にBCB樹脂層41を形成する。そして、このBCB樹脂層41の熱硬化(キュア)を行う。その後、図3(b)に示されるように、BCB樹脂層41の一部にエッチングを施すことによって、図1及び図2に示されたBCB樹脂領域4が形成される。
続いて、BCB樹脂領域4の表面4aを、図3(c)に示されるように、酸素原子を含むガスと不活性ガスとの混合ガスから生成されたプラズマP1によって処理する。これにより、BCB樹脂領域4の表面4aに凹凸が形成されるとともに、BCB樹脂領域4の表面4a上にシリコン酸化膜6が形成される。
続いて、図1、図2、図5(a)〜図5(c)に示されるように、シリコン酸化膜6上に電極パッド8を形成する。電極パッド8は例えばリフトオフ法を用いて以下のように形成される。
図10は、第2実施形態に係る半導体光デバイスを模式的に示す平面図である。図11は、図10に示されるXI−XI線に沿った断面図である。図10及び図11に示される半導体光デバイス20は、主としてIII−V族化合物半導体から構成される半導体レーザ(半導体光素子)36と、半導体レーザ36上に設けられたBCB樹脂領域40と、BCB樹脂領域40上に設けられたシリコン酸化膜44と、シリコン酸化膜44上に設けられた電極パッド46とを備える。BCB樹脂領域40、シリコン酸化膜44及び電極パッド46は、互いに密着して設けられている。BCB樹脂領域40、シリコン酸化膜44及び電極パッド46は、第1実施形態のBCB樹脂領域4、シリコン酸化膜6及び電極パッド8とそれぞれ同様の材料から構成される。また、シリコン酸化膜44及び電極パッド46は、シリコン酸化膜6及び電極パッド8とそれぞれ同様の形状を有する。
Claims (5)
- 光を発生、吸収、若しくは導波する層を含む半導体光素子上に、Si原子を含むBCB樹脂領域を形成する樹脂層形成工程と、
酸素原子を含むガスと不活性ガスとを含む混合ガスから生成された誘導結合プラズマによって前記BCB樹脂領域の表面を処理することにより、前記BCB樹脂に含まれる骨格分子を残しつつ、それ以外の樹脂を前記誘導結合プラズマにより削って前記BCB樹脂領域の表面に凹凸を形成するとともに前記BCB樹脂領域の表面上にシリコン酸化膜を形成するプラズマ処理工程と、
金属からなる電極パッドを前記BCB樹脂領域の表面上に形成する電極パッド形成工程とを含み、
前記プラズマ処理工程の際に、前記シリコン酸化膜の厚さを4nm以上50nm以下とすることを特徴とする、半導体光デバイスの製造方法。 - 前記プラズマ処理工程の際に、バイアスパワーを50W以上100W以下とすることを特徴とする、請求項1に記載の半導体光デバイスの製造方法。
- 前記プラズマ処理工程の際に、前記BCB樹脂領域の表面粗さを3nm以上5nm以下とすることを特徴とする、請求項1または2に記載の半導体光デバイスの製造方法。
- 前記プラズマ処理工程の際に、誘導結合プラズマのパワーを50W以上100W以下とす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光デバイスの製造方法。
- 前記酸素原子を含むガスは酸素ガス(O 2 )であり、前記不活性ガスは窒素ガス(N 2 )であり、前記酸素ガスと前記窒素ガスとの混合比が、N 2 :O 2 =9:1〜8:2の範囲内である、請求項1〜4のいずれか一項に記載の半導体光デバイスの製造方法。
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