JP5159040B2 - 低温成長バッファ層の形成方法および発光素子の製造方法 - Google Patents
低温成長バッファ層の形成方法および発光素子の製造方法 Download PDFInfo
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- 238000000034 method Methods 0.000 title claims description 23
- 238000004519 manufacturing process Methods 0.000 title claims description 9
- 239000000758 substrate Substances 0.000 claims description 91
- 229910005191 Ga 2 O 3 Inorganic materials 0.000 claims description 58
- 238000005121 nitriding Methods 0.000 claims description 22
- 229910002704 AlGaN Inorganic materials 0.000 claims description 15
- 239000012298 atmosphere Substances 0.000 claims description 15
- 238000004140 cleaning Methods 0.000 claims description 13
- 239000002253 acid Substances 0.000 claims description 7
- 239000007789 gas Substances 0.000 claims description 5
- 239000012299 nitrogen atmosphere Substances 0.000 claims description 2
- 238000002488 metal-organic chemical vapour deposition Methods 0.000 claims 8
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 10
- 239000013078 crystal Substances 0.000 description 8
- 229920005989 resin Polymers 0.000 description 7
- 239000011347 resin Substances 0.000 description 7
- XCZXGTMEAKBVPV-UHFFFAOYSA-N trimethylgallium Chemical compound C[Ga](C)C XCZXGTMEAKBVPV-UHFFFAOYSA-N 0.000 description 7
- 239000004065 semiconductor Substances 0.000 description 6
- 229920002050 silicone resin Polymers 0.000 description 6
- 238000009792 diffusion process Methods 0.000 description 5
- JLTRXTDYQLMHGR-UHFFFAOYSA-N trimethylaluminium Chemical compound C[Al](C)C JLTRXTDYQLMHGR-UHFFFAOYSA-N 0.000 description 5
- 239000000919 ceramic Substances 0.000 description 4
- 239000011248 coating agent Substances 0.000 description 4
- 238000000576 coating method Methods 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 238000007789 sealing Methods 0.000 description 4
- JNDMLEXHDPKVFC-UHFFFAOYSA-N aluminum;oxygen(2-);yttrium(3+) Chemical compound [O-2].[O-2].[O-2].[Al+3].[Y+3] JNDMLEXHDPKVFC-UHFFFAOYSA-N 0.000 description 3
- 239000012159 carrier gas Substances 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 239000003822 epoxy resin Substances 0.000 description 3
- 229920000647 polyepoxide Polymers 0.000 description 3
- IBEFSUTVZWZJEL-UHFFFAOYSA-N trimethylindium Chemical compound C[In](C)C IBEFSUTVZWZJEL-UHFFFAOYSA-N 0.000 description 3
- 229910019901 yttrium aluminum garnet Inorganic materials 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 229910000881 Cu alloy Inorganic materials 0.000 description 2
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 239000002019 doping agent Substances 0.000 description 2
- 239000010408 film Substances 0.000 description 2
- 239000011777 magnesium Substances 0.000 description 2
- 238000004080 punching Methods 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 238000004506 ultrasonic cleaning Methods 0.000 description 2
- 229910018072 Al 2 O 3 Inorganic materials 0.000 description 1
- MHYQBXJRURFKIN-UHFFFAOYSA-N C1(C=CC=C1)[Mg] Chemical compound C1(C=CC=C1)[Mg] MHYQBXJRURFKIN-UHFFFAOYSA-N 0.000 description 1
- BLRPTPMANUNPDV-UHFFFAOYSA-N Silane Chemical compound [SiH4] BLRPTPMANUNPDV-UHFFFAOYSA-N 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000005229 chemical vapour deposition Methods 0.000 description 1
- 230000000295 complement effect Effects 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- AJNVQOSZGJRYEI-UHFFFAOYSA-N digallium;oxygen(2-) Chemical compound [O-2].[O-2].[O-2].[Ga+3].[Ga+3] AJNVQOSZGJRYEI-UHFFFAOYSA-N 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000005530 etching Methods 0.000 description 1
- 230000005284 excitation Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 229910001195 gallium oxide Inorganic materials 0.000 description 1
- AMGQUBHHOARCQH-UHFFFAOYSA-N indium;oxotin Chemical compound [In].[Sn]=O AMGQUBHHOARCQH-UHFFFAOYSA-N 0.000 description 1
- 229910010272 inorganic material Inorganic materials 0.000 description 1
- 239000011147 inorganic material Substances 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 150000004767 nitrides Chemical class 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 1
- 239000011941 photocatalyst Substances 0.000 description 1
- 238000007747 plating Methods 0.000 description 1
- 238000002310 reflectometry Methods 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
- 229910000679 solder Inorganic materials 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 238000005979 thermal decomposition reaction Methods 0.000 description 1
- 239000010409 thin film Substances 0.000 description 1
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 description 1
- 229910052721 tungsten Inorganic materials 0.000 description 1
- 239000010937 tungsten Substances 0.000 description 1
- 238000007740 vapor deposition Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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Description
Japanese Journal of Applied Physics Vol.44, No.1,2005. pp.L7−L8
図1は、本発明の第1の実施の形態に係るLED素子を示す側面図である。
以下に説明するLED素子1は、MOCVD(Metal Organic Chemical Vapor Deposition)装置を用いて製造される。
このLED素子1は、n型の導電型を有するβ−Ga2O3からなる基板(以下、「Ga2O3基板」という。)10を有し、Ga2O3基板10上に低温成長条件で形成したAlNバッファ層11と、Siドープのn+−GaN層12と、Siドープのn−AlGaN層13と、InGaN/GaNの多重量子井戸構造を有するMQW(Multiple-Quantum Well)14と、Mgドープのp−AlGaN層15と、Mgドープのp+−GaN層16と、ITO(Indium Tin Oxide)からなる電流拡散層17とを順次積層して形成されており、更に電流拡散層17の上面に設けられるp側電極18と、電流拡散層17からエッチングを施すことにより露出させたGaN層12に設けられるn側電極19とを有する。
まず、本製造プロセスで使用する1cm×2cm×350μm厚のGa2O3基板10に対し、60℃のHNO3で10分の酸洗浄を行い、続いてエタノール中で5分の超音波洗浄を行い、その後純水中で5分の超音波洗浄を行うことにより、基板洗浄を行う。
次に、MOCVD装置のサセプタに基板洗浄処理されたGa2O3基板10を搭載する。次に、リアクタ内にN2を供給して時刻t1から昇温を開始し、800℃となった時刻t2において昇温を停止し、その温度を維持する。このようにして安定化を図ることにより時刻t3から基板表面が窒化処理される。
次に、時刻t4においてリアクタへのN2の供給を停止し、H2の供給を開始する。次に、時刻t5においてリアクタ内の昇温を停止し、400℃となった時刻t6でリアクタの温度を400℃に保ちながらNH3とともにTMAをそれぞれ50sccm供給する。このことにより、時刻t7からGa2O3基板10上には膜厚100〜300ÅのAlNバッファ層11が形成される。
次に、時刻t8においてリアクタへのH2の供給を停止し、N2の供給を開始する。続いて時刻t9よりリアクタ内の昇温を開始し、1050℃となった時刻t10において昇温を停止し、その温度を維持するとともにTMGを60sccm供給することによってAlNバッファ層11上に膜厚1μmのn+−GaN層12を形成する。次に、時刻t11となったところでリアクタへのN2の供給を停止し、H2 を供給する。このことによってAlNバッファ層11上に更に膜厚2μmのn+−GaN層12を形成し、時刻t12においてリアクタへのH2の供給を停止する。
上記した第1の実施の形態によると、温度条件を350℃から550℃の範囲、より好ましくは400℃のH2雰囲気中でGa2O3基板10上にAlNバッファ層11を形成することにより、H2雰囲気におけるβ−Ga2O3の熱分解を生じることなくAlNバッファ層11を安定して成膜させることができ、その表面に結晶品質に優れる良質なn+−GaN層12を形成することができる。
(発光装置20の構成)
図3は、本発明の第2の実施の形態に係る発光装置の縦断面図である。
上記した第2の実施の形態によると、第1の実施の形態で説明したLED素子1を用いて量産性に優れる小型パッケージのLEDが得られる。なお、第2の実施の形態では、封止樹脂として蛍光体含有シリコーン樹脂27を用いた構成を説明したが、蛍光体を含有しないシリコーン樹脂、あるいはエポキシ樹脂であっても良く、更に、本体24との熱膨張差を小にするフィラーを所定の量含有させても良い。
(発光装置20の構成)
図4は、本発明の第3の実施の形態に係る発光装置の縦断面図である。
上記した第3の実施の形態によると、第1の実施の形態で説明したLED素子1を用いて量産性に優れる砲弾型のLEDが得られる。なお、第3の実施の形態では、リードフレーム31に設けたカップ部31Aの底面にLED素子1を固定した構成を説明したが、カップ部31Aを形成せずにリードフレーム31の上面に固定する構成としても良い。この場合にはコーティング樹脂33による封止工程を省略でき、コストダウンを図ることができる。
Claims (9)
- Ga2O3基板をMOCVD装置内にセットする基板セットステップと、
前記MOCVD装置内をH2雰囲気とし、雰囲気温度を前記Ga2O3基板が熱分解しない350℃から550℃にするバッファ層成長条件を設定する条件設定ステップと、
前記バッファ層成長条件において原料ガスとしてTMG及びTMAの少なくとも一方と、NH3とを前記Ga2O3基板上に供給して前記Ga2O3基板上にAlxGa1−xN(0≦x≦1)である低温成長AlGaNバッファ層を形成するバッファ層形成ステップとを有する低温成長バッファ層の形成方法。 - 前記基板セットステップの前に、Ga2O3基板を酸洗浄する基板洗浄ステップを有する請求項1に記載の低温成長バッファ層の形成方法。
- 前記基板洗浄ステップ、及び前記基板セットステップの後に、N 2 を供給してGa2O3基板を窒化処理する基板窒化ステップを有する請求項2に記載の低温成長バッファ層の形成方法。
- 前記基板窒化ステップは、前記Ga2O3基板を750℃から850℃の温度範囲でN 2 を供給して窒化処理する請求項3に記載の低温成長バッファ層の形成方法。
- 前記基板セットステップの後に、Ga2O3基板を窒化処理する基板窒化ステップを有する請求項1に記載の低温成長バッファ層の形成方法。
- 前記基板窒化ステップは、前記Ga2O3基板を750℃から850℃の温度範囲でN 2 を供給して窒化処理する請求項5に記載の低温成長バッファ層の形成方法。
- Ga2O3基板を酸洗浄する基板洗浄ステップと、
前記Ga2O3基板をMOCVD装置内にセットする基板セットステップと、
N 2 を供給して前記酸洗浄された前記Ga2O3基板を窒化処理する基板窒化ステップと、
前記MOCVD装置内をH2雰囲気とし、雰囲気温度を前記Ga2O3基板が熱分解しない350℃から550℃にするバッファ層成長条件を設定する条件設定ステップと、
前記バッファ層成長条件において原料ガスとしてTMG及びTMAの少なくとも一方と、NH3とを前記Ga2O3基板上に供給して前記Ga2O3基板上にAlxGa1−xN(0≦x≦1)である低温成長AlGaNバッファ層を形成するバッファ層形成ステップと、
前記MOCVD装置内をN2雰囲気とし、前記低温成長AlGaNバッファ層上に第1のGaN層を形成する第1GaN層形成ステップと、
前記MOCVD装置内をH2雰囲気とし、前記第1のGaN層上に第2のGaN層を形成する第2GaN層形成ステップとを有する発光素子の製造方法。 - 前記基板窒化ステップは、前記Ga2O3基板を750℃から850℃の温度範囲でN 2 を供給して窒化処理する請求項7に記載の発光素子の製造方法。
- Ga2O3基板をMOCVD装置内にセットする基板セットステップと、
前記MOCVD装置内をH2雰囲気とし、雰囲気温度を前記Ga2O3基板が熱分解しない350℃から550℃にするバッファ層成長条件を設定する条件設定ステップと、
前記バッファ層成長条件において原料ガスとしてTMAとNH3とを前記Ga2O3基板上に供給して前記Ga2O3基板上に低温成長AlNバッファ層を形成するバッファ層形成ステップとを有する低温成長バッファ層の形成方法。
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