JP2017102420A - レジスト下層膜材料及びパターン形成方法 - Google Patents
レジスト下層膜材料及びパターン形成方法 Download PDFInfo
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- JP2017102420A JP2017102420A JP2016061853A JP2016061853A JP2017102420A JP 2017102420 A JP2017102420 A JP 2017102420A JP 2016061853 A JP2016061853 A JP 2016061853A JP 2016061853 A JP2016061853 A JP 2016061853A JP 2017102420 A JP2017102420 A JP 2017102420A
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Abstract
Description
本発明のレジスト下層膜材料は、上記一般式(1)で示される繰り返し単位を有するフッ素化されたビスナフトールノボラック樹脂を含有するものである。フッ素化されたビスナフトールノボラック樹脂は、フッ素化されていないビスナフトールノボラック樹脂よりも粘性が低く、高温ベーク時における流動性が高く、凹凸がある基板の平坦性に優れる特徴がある。更には、これに加えて上記一般式(2)で示される繰り返し単位を有するノボラック樹脂及び上記一般式(3)で示されるビスナフトール誘導体のいずれか又は両方を含有するものとすることができる。このようなレジスト下層膜材料であれば、スピンコート中に一般式(1)で示されるフッ素化されたビスナフトールノボラック樹脂が膜表面を覆う。このフッ素原子を含む層の存在によって、埋め込み特性を向上させるためのモノマー成分を含むレジスト下層膜材料を高温でベークした場合でも、アウトガスの発生を抑えることができる。
本発明のレジスト下層膜材料には、更に有機溶剤を使用してもよい。本発明のレジスト下層膜材料において使用可能な有機溶剤としては、上記のノボラック樹脂等のベース樹脂、モノマー成分、更には後述の酸発生剤、架橋剤等の添加剤が溶解するものであれば特に制限はない。具体的には、特開2007−199653号公報中の(0091)〜(0092)段落に記載されている溶剤を添加することができる。
レジスト下層膜としては、レジスト下層膜上に珪素含有中間層膜材料あるいはレジスト上層膜材料をディスペンスしたときに、珪素含有中間層膜材料あるいはレジスト上層膜材料に溶解しないことと、珪素含有中間層膜あるいはレジスト上層膜とミキシングしない特性が必要である。そのため、本発明のレジスト下層膜材料には、塗布後のベークで架橋させるための架橋剤を添加することが好ましい。
また、本発明のレジスト下層膜材料には、熱による架橋反応を更に促進させるための酸発生剤を添加することができる。酸発生剤は熱分解によって酸を発生するものや、光照射によって酸を発生するものがあるが、いずれのものも添加することができる。酸発生剤としては、具体的には、特開2007−199653号公報の(0061)〜(0085)段落に記載されている材料を挙げることができる。
本発明では、リソグラフィーにより基板にパターンを形成する方法であって、被加工基板上に上述の本発明のレジスト下層膜材料を用いてレジスト下層膜を形成し、該レジスト下層膜上に珪素含有中間層膜材料を用いて珪素含有中間層膜を形成し、該珪素含有中間層膜上にレジスト上層膜材料を用いてレジスト上層膜を形成し、該レジスト上層膜のパターン回路領域を露光した後、現像して前記レジスト上層膜にレジストパターンを形成し、該レジストパターンが形成されたレジスト上層膜をマスクにして前記珪素含有中間層膜にエッチングでパターンを転写し、該パターンが転写された珪素含有中間層膜をマスクにして前記レジスト下層膜にエッチングでパターンを転写し、更に、該パターンが転写されたレジスト下層膜をマスクにして前記被加工基板にエッチングでパターンを形成するパターン形成方法を提供する。
被加工基板としては、特に限定されないが、例えば基板上に被加工層が形成されたものを用いることができる。基板としては、特に限定されるものではなく、Si、α−Si、p−Si、SiO2、SiN、SiON、W、TiN、Al等で被加工層と異なる材質のものを好適に用いることができる。また、被加工層としては、Si、SiO2、SiON、SiN、p−Si、α−Si、W、W−Si、Al、Cu、Al−Si等及び種々のLow−k膜(低誘電膜)、及びそのエッチングストッパー膜、あるいはFin−FETの段差基板などを好適に用いることができ、被加工層の厚さとしては、10〜10,000nmが好ましく、20〜5,000nmが特に好ましい。
珪素含有中間層膜の材料としては、特に限定されないが、特開2007−302873号公報に記載の露光波長に吸収を有するシルセスキオキサン系の材料を用いることができる。また、珪素含有中間層膜は、スピンコートによって形成される。珪素含有中間層膜材料をスピンコートした後に150〜300℃の温度でベークして、珪素酸化膜からなる珪素含有中間層膜を形成することができる。
レジスト上層膜材料としては、特に限定されないが、例えば特開平9−73173号公報、特開2000−336121号公報に示されるような公知の炭化水素系からなるベースポリマーを使用することができる。なお、レジスト上層膜の厚さは特に制限されないが、20〜500nmのものが好ましく、特に30〜400nmのものが好ましい。
無機ハードマスク中間層膜の材料としては、特に限定されない。珪素、チタン、ジルコニウム、ハフニウム等の金属から選ばれる元素を含有する無機ハードマスク中間層膜、特にはチタン含有中間膜については特開2014−178602号公報に記載の材料を用いることができる。レジスト下層膜上に無機ハードマスク中間層膜を形成し、その上にレジスト上層膜を設けてトライレイヤープロセスとすることができる。無機ハードマスク中間層膜材料としては、特にp−Si、SiN、SiON、SiC、TiN、TiO2、TiC、ZrO2、HfO2が好適である。
有機反射防止膜材料としては、特に限定されず、公知のものを使用できる。
炭化水素膜材料としては、特に限定されず、公知のものを使用できる。
(3層プロセス)
まず、本発明のレジスト下層膜材料を用いたレジスト下層膜の形成方法について説明する。通常のフォトレジスト膜の形成法と同様に、スピンコート法等で基板上に形成することが可能である。スピンコート法等でレジスト下層膜材料を上記の被加工基板上に塗布し、レジスト下層膜を形成した後、有機溶剤を蒸発させて、レジスト上層膜とのミキシングを防止するため、あるいは架橋反応を促進させるためにベークをすることが好ましい。ベーク温度は80〜800℃の範囲内で、10〜300秒の範囲内が好ましい。なお、このレジスト下層膜の厚さは適宜選定されるが、5〜100,000nmとすることが好ましく、特に10〜50,000nmとすることが好ましい。このような厚さにすれば、高い反射防止効果を得ることができる。
次に、本発明の、4層プロセスのパターン形成方法について説明する。図3のフロー図に示されるパターン形成方法では、III−i)基板1上の被加工層2に本発明のレジスト下層膜材料をコーティングしてレジスト下層膜3を形成し、レジスト下層膜3上に無機ハードマスク中間層膜材料をコーティングして無機ハードマスク中間層膜7を形成し、無機ハードマスク中間層膜7上に有機反射防止膜材料をコーティングして有機反射防止膜8を形成し、有機反射防止膜8上にレジスト上層膜材料をコーティングして、レジスト上層膜5を形成して4層レジスト膜とし、III−ii)パターン回路領域6を露光し、III−iii)現像して前記レジスト上層膜5にレジストパターンを形成し(ポジ型レジストの場合)、III−iv)レジストパターンが形成されたレジスト上層膜5をマスクにして有機反射防止膜8にエッチングでパターンを転写し、III−v)パターンが転写された有機反射防止膜8をマスクにして無機ハードマスク中間層膜7にエッチングでパターンを転写し、III−vi)パターンが転写された無機ハードマスク中間層膜7をマスクにしてレジスト下層膜3にエッチングでパターンを転写し、III−vii)更に、パターンが転写されたレジスト下層膜3をマスクにして被加工層2にエッチングでパターンを形成する。
次に、本発明の、5層プロセスのパターン形成方法について説明する。図4のフロー図に示されるパターン形成方法では、IV−i)基板1上の被加工層2に本発明のレジスト下層膜材料をコーティングしてレジスト下層膜3を形成し、レジスト下層膜3上に無機ハードマスク中間層膜材料をコーティングして無機ハードマスク中間層膜7を形成し、無機ハードマスク中間層膜7上に炭化水素膜材料を用いて炭化水素膜9をスピンコートで形成し、炭化水素膜9上に珪素含有中間層膜材料を用いて珪素含有中間層膜4を形成し、珪素含有中間層膜4上にレジスト上層膜材料をコーティングして、レジスト上層膜5を形成して5層レジスト膜とし、IV−ii)パターン回路領域6を露光し、IV−iii)現像して前記レジスト上層膜5にレジストパターンを形成し(ポジ型レジストの場合)、IV−iv)レジストパターンが形成されたレジスト上層膜5をマスクにして珪素含有中間層膜4にエッチングでパターンを転写し、IV−v)パターンが転写された珪素含有中間層膜4をマスクにして炭化水素膜9にエッチングでパターンを転写し、IV−vi)パターンが転写された炭化水素膜9をマスクにして無機ハードマスク中間層膜7にエッチングでパターンを転写し、IV−vii)更に、パターンが転写された無機ハードマスク中間層膜7をマスクにしてレジスト下層膜3にエッチングでパターンを転写し、IV−viii)更に、パターンが転写されたレジスト下層膜3をマスクにして被加工層2にエッチングでパターンを形成する。このとき、炭化水素膜のエッチングは常法に従って行えばよい。
(合成例1−1)
6,6’−(9H−フルオレン−9,9−ジイル)ジ(2−ナフトール)45g、ペンタフルオロベンズアルデヒド25g、シュウ酸5g、ジオキサン100gを加え、100℃で24時間撹拌した。反応後、メチルイソブチルケトン500mlに溶解させ、十分な水洗により触媒と金属不純物を除去した。更に、150℃,2mmHgまで減圧し、水分と溶剤を減圧除去し、以下に示すノボラック樹脂1−1を得た。
合成例1−1と同様にして、6,6’−(9H−フルオレン−9,9−ジイル)ジ(2−ナフトール)45g、4−(トリフルオロメチル)ベンズアルデヒド22g、シュウ酸5g、ジオキサン100gを加え、以下に示すノボラック樹脂1−2を得た。
合成例1−1と同様にして、6,6’−(9H−フルオレン−9,9−ジイル)ジ(2−ナフトール)32g、4―(1,1,1,3,3,3−ヘキサフルオロ−2−プロパノール)フェノール7.8g、4−フルオロベンズアルデヒド15g、シュウ酸5g、ジオキサン100gを加え、以下に示すノボラック樹脂1−3を得た。
合成例1−1と同様にして、1,1’−メチレンジ−2−ナフトール30g、4−トリフルオロメトキシベンズアルデヒド21g、シュウ酸5g、ジオキサン100gを加え、以下に示すノボラック樹脂1−4を得た。
合成例1−1と同様にして、αナフトールフタレイン42g、4―(1,1,1,3,3,3−ヘキサフルオロ−2−プロパノール)ベンズアルデヒド17.8g、シュウ酸5g、ジオキサン100gを加え、以下に示すノボラック樹脂1−5を得た。
合成例1−1と同様にして、ナフトフルオレセイン43g、4−(トリフルオロメチルチオ)ベンズアルデヒド25g、シュウ酸5g、ジオキサン100gを加え、以下に示すノボラック樹脂1−6を得た。
合成例1−1と同様にして、6,6’−(9H−フルオレン−9,9−ジイル)ジ(2−ナフトール)45g、4―(1,1,1,3,3,3−ヘキサフルオロ−2−プロパノール)ベンズアルデヒド17.8g、シュウ酸5g、ジオキサン100gを加え、以下に示すノボラック樹脂1−7を得た。
合成例1−1と同様にして、6,6’−(9H−フルオレン−9,9−ジイル)ジ(2−ナフトール)45g、トリフルオロアセトアルデヒドの75質量%水溶液の20g、シュウ酸5g、ジオキサン100gを加え、以下に示すノボラック樹脂1−8を得た。
(合成例2−1)
6,6’−(9H−フルオレン−9,9−ジイル)ジ(2−ナフトール)45g、37質量%ホルマリン水溶液120g、シュウ酸5g、ジオキサン50gを加え、100℃で24時間撹拌した。反応後、メチルイソブチルケトン500mlに溶解し、十分な水洗により触媒と金属不純物を除去した。更に、150℃,2mmHgまで減圧し、水分と溶剤を減圧除去し、以下に示すノボラック樹脂2−1を得た。
合成例2−1と同様にして、αナフトールフタレイン45g、37質量%ホルマリン水溶液120g、シュウ酸5g、ジオキサン50gを加え、以下に示すノボラック樹脂2−2を得た。
合成例2−1と同様にして、ナフトフルオレセイン45g、37質量%ホルマリン水溶液120g、シュウ酸5g、ジオキサン50gを加え、以下に示すノボラック樹脂2−3を得た。
6,6’−(9H−フルオレン−9,9−ジイル)ジ(2−ナフトール)45g、37質量%ホルマリン水溶液60g、シュウ酸5g、ジオキサン50gを加え、80℃で24時間撹拌した。反応後、合成例2−1と同様にして、以下に示すノボラック樹脂2−4を得た。
[レジスト下層膜材料の調製]
上記ノボラック樹脂1−1〜1−8、ノボラック樹脂2−1〜2−4で示される樹脂、下記に示されるモノマー1〜5をFC−4430(住友スリーエム社製)0.1質量%を含む有機溶剤中に表1に示す割合で溶解させ、孔径0.1μmのフッ素樹脂製のフィルターで濾過することによってレジスト下層膜材料(下層膜材料1〜13、比較下層膜材料1、2)をそれぞれ調製した。
製造したレジスト下層膜材料(下層膜材料1〜13、比較下層膜材料1、2)を、それぞれSi基板上に塗布し、表2に記載の条件で焼成し、ベーク中にホットプレートオーブン中に発生するパーティクルを、リオン社製パーティクルカウンターKR−11Aを用いて0.3μmと0.5μmサイズのパーティクル数について測定した。結果を表2に示す。
段差基板として、膜厚500nm、サイズ160nm、ピッチ320nmのSiO2膜の密集ホールパターンが形成されたSi基板を使用した。製造したレジスト下層膜材料(下層膜材料1〜13、比較下層膜材料1、2)を、平坦なSi基板上で100nm膜厚となるように段差基板のSiO2膜上に塗布した後、ウェハーを割断してホールの底までレジスト下層膜材料が埋め込まれているかどうかSEMで観察した。結果を表3に示す。
下記に示される珪素含有ポリマー及び酸発生剤PAG1を、FC−4430(住友スリーエム社製)0.1質量%を含む有機溶剤中に、表4に示される割合で溶解させ、孔径0.1μmのフッ素樹脂製のフィルターで濾過することによって珪素含有中間層膜材料を調製した。上記で調製した珪素含有中間層膜材料を、Si基板上に塗布して、200℃で60秒間ベークしてそれぞれ膜厚40nmの珪素含有中間層膜を形成した。珪素含有中間層膜の形成後、入射角度可変のJ.A.ウーラム社製分光エリプソメーター(VASE)で波長193nmにおける屈折率(n,k)を求め、その結果を表4に示した。
下記に示されるレジストポリマー、酸発生剤PAG2、クエンチャーを、FC−4430(住友スリーエム社製)0.1質量%を含む有機溶剤中に、表5に示される割合で溶解させ、孔径0.1μmのフッ素樹脂製のフィルターで濾過することによってレジスト上層膜材料(ArF用レジスト膜材料)を調製した。
(実施例2−1〜2−13、比較例2−1、2−2)
製造したレジスト下層膜形成材料(下層膜材料1〜13、比較下層膜材料1、2)を、膜厚80nmのSiO2膜が形成された300mmSiウェハー基板上に塗布して、下層膜材料1〜12、比較下層膜材料1、2では350℃で60秒間ベーク、下層膜材料13では370℃で60秒間ベークして膜厚100nmのレジスト下層膜を形成した。なお、レジスト下層膜のベーク雰囲気は空気中とした。その上に前記調製した珪素含有中間層膜材料を塗布して200℃で60秒間ベークして膜厚35nmの中間層膜を形成し、その上にArF用レジスト膜材料を塗布し、105℃で60秒間ベークして膜厚100nmのArF用レジスト膜を形成した。
珪素含有中間層膜への転写条件
チャンバー圧力 10.0Pa
RFパワー 1,500W
CF4ガス流量 15sccm(mL/min)
O2ガス流量 75sccm(mL/min)
時間 15sec
チャンバー圧力 2.0Pa
RFパワー 500W
Arガス流量 75sccm(mL/min)
O2ガス流量 45sccm(mL/min)
時間 120sec
チャンバー圧力 2.0Pa
RFパワー 2,200W
C5F12ガス流量 20sccm(mL/min)
C2F6ガス流量 10sccm(mL/min)
Arガス流量 300sccm(mL/min)
O2ガス流量 60sccm(mL/min)
時間 90sec
5…レジスト上層膜、 6…パターン回路領域、 7…無機ハードマスク中間層膜、
8…有機反射防止膜、 9…炭化水素膜。
Claims (14)
- 下記一般式(1)で示される繰り返し単位を有するノボラック樹脂を含有するものであることを特徴とするレジスト下層膜材料。
- 前記レジスト下層膜材料が、更にフッ素原子を有さない置換又は非置換のビスナフトール樹脂を含有するものであることを特徴とする請求項1に記載のレジスト下層膜材料。
- 前記レジスト下層膜材料が、更に下記一般式(2)で示される繰り返し単位を有するノボラック樹脂及び下記一般式(3)で示されるビスナフトール誘導体のいずれか又は両方を含有するものであることを特徴とする請求項1又は請求項2に記載のレジスト下層膜材料。
- 前記一般式(1)で示される繰り返し単位を有するノボラック樹脂が、少なくとも1個以上のフッ素原子を有するアルデヒドと置換又は非置換のビスナフトール誘導体の縮合物であり、前記一般式(2)で示される繰り返し単位を有するノボラック樹脂が、フッ素原子を有さないアルデヒドと置換又は非置換のビスナフトール誘導体の縮合物であることを特徴とする請求項3に記載のレジスト下層膜材料。
- 前記レジスト下層膜材料が、前記一般式(1)で示される繰り返し単位を有するノボラック樹脂と、前記一般式(2)で示される繰り返し単位を有するノボラック樹脂と、前記一般式(3)で示されるビスナフトール誘導体を含有するものであることを特徴とする請求項3又は請求項4に記載のレジスト下層膜材料。
- 前記レジスト下層膜材料が、前記一般式(1)で示される繰り返し単位を有するノボラック樹脂の100質量部に対して、前記一般式(2)で示される繰り返し単位を有するノボラック樹脂と前記一般式(3)で示されるビスナフトール誘導体を合計5〜10000質量部含有するものであることを特徴とする請求項5に記載のレジスト下層膜材料。
- 前記レジスト下層膜材料が、更に有機溶剤を含有するものであることを特徴とする請求項1から請求項6のいずれか一項に記載のレジスト下層膜材料。
- 前記レジスト下層膜材料が、更に酸発生剤及び/又は架橋剤を含有するものであることを特徴とする請求項1から請求項7のいずれか一項に記載のレジスト下層膜材料。
- リソグラフィーにより基板にパターンを形成する方法であって、被加工基板上に請求項1から請求項8のいずれか一項に記載のレジスト下層膜材料を用いてレジスト下層膜を形成し、該レジスト下層膜上に珪素含有中間層膜材料を用いて珪素含有中間層膜を形成し、該珪素含有中間層膜上にレジスト上層膜材料を用いてレジスト上層膜を形成し、該レジスト上層膜のパターン回路領域を露光した後、現像して前記レジスト上層膜にレジストパターンを形成し、該レジストパターンが形成されたレジスト上層膜をマスクにして前記珪素含有中間層膜にエッチングでパターンを転写し、該パターンが転写された珪素含有中間層膜をマスクにして前記レジスト下層膜にエッチングでパターンを転写し、更に、該パターンが転写されたレジスト下層膜をマスクにして前記被加工基板にエッチングでパターンを形成することを特徴とするパターン形成方法。
- リソグラフィーにより基板にパターンを形成する方法であって、被加工基板上に請求項1から請求項8のいずれか一項に記載のレジスト下層膜材料を用いてレジスト下層膜を形成し、該レジスト下層膜上に、珪素酸化膜、珪素窒化膜、珪素酸化窒化膜、珪素炭化膜、ポリシリコン膜、窒化チタン膜、酸化チタン膜、炭化チタン膜、酸化ジルコニウム膜、又は酸化ハフニウム膜から選ばれる無機ハードマスク中間層膜を形成し、該無機ハードマスク中間層膜上にレジスト上層膜材料を用いてレジスト上層膜を形成し、該レジスト上層膜のパターン回路領域を露光した後、現像して前記レジスト上層膜にレジストパターンを形成し、該レジストパターンが形成されたレジスト上層膜をマスクにして前記無機ハードマスク中間層膜にエッチングでパターンを転写し、該パターンが転写された無機ハードマスク中間層膜をマスクにして前記レジスト下層膜にエッチングでパターンを転写し、更に、該パターンが転写されたレジスト下層膜をマスクにして前記被加工基板にエッチングでパターンを形成することを特徴とするパターン形成方法。
- リソグラフィーにより基板にパターンを形成する方法であって、被加工基板上に請求項1から請求項8のいずれか一項に記載のレジスト下層膜材料を用いてレジスト下層膜を形成し、該レジスト下層膜上に、珪素酸化膜、珪素窒化膜、珪素酸化窒化膜、珪素炭化膜、ポリシリコン膜、窒化チタン膜、酸化チタン膜、炭化チタン膜、酸化ジルコニウム膜、又は酸化ハフニウム膜から選ばれる無機ハードマスク中間層膜を形成し、該無機ハードマスク中間層膜上に有機反射防止膜を形成し、該有機反射防止膜上にレジスト上層膜材料を用いてレジスト上層膜を形成して4層レジスト膜とし、前記レジスト上層膜のパターン回路領域を露光した後、現像して前記レジスト上層膜にレジストパターンを形成し、該レジストパターンが形成されたレジスト上層膜をマスクにして前記有機反射防止膜及び無機ハードマスク中間層膜にエッチングでパターンを転写し、該パターンが転写された無機ハードマスク中間層膜をマスクにして前記レジスト下層膜にエッチングでパターンを転写し、更に、該パターンが転写されたレジスト下層膜をマスクにして前記被加工基板にエッチングでパターンを形成することを特徴とするパターン形成方法。
- リソグラフィーにより基板にパターンを形成する方法であって、被加工基板上に請求項1から請求項8のいずれか一項に記載のレジスト下層膜材料を用いてレジスト下層膜を形成し、該レジスト下層膜上に、珪素酸化膜、珪素窒化膜、珪素酸化窒化膜、珪素炭化膜、ポリシリコン膜、窒化チタン膜、酸化チタン膜、炭化チタン膜、酸化ジルコニウム膜、又は酸化ハフニウム膜から選ばれる無機ハードマスク中間層膜を形成し、該無機ハードマスク中間層膜上に炭化水素膜材料を用いて炭化水素膜をスピンコートで形成し、該炭化水素膜上に珪素含有中間層膜材料を用いて珪素含有中間層膜を形成し、該珪素含有中間層膜上にレジスト上層膜材料を用いてレジスト上層膜を形成して5層レジスト膜とし、前記レジスト上層膜のパターン回路領域を露光した後、現像して前記レジスト上層膜にレジストパターンを形成し、該レジストパターンが形成されたレジスト上層膜をマスクにして前記珪素含有中間層膜にエッチングでパターンを転写し、該パターンが転写された珪素含有中間層膜をマスクにして前記炭化水素膜にエッチングでパターンを転写し、該パターンが転写された前記炭化水素膜をエッチングマスクにして前記無機ハードマスク中間層膜にエッチングでパターンを転写し、該パターンが転写された前記無機ハードマスク中間層膜をマスクにして前記レジスト下層膜にエッチングでパターンを転写し、更に、該パターンが転写されたレジスト下層膜を、マスクにして前記被加工基板にエッチングでパターンを形成することを特徴とするパターン形成方法。
- 前記無機ハードマスク中間層膜を、CVD法、ALD法、及びスパッタリング法のいずれかで形成することを特徴とする請求項10から請求項12のいずれか一項に記載のパターン形成方法。
- 前記レジスト上層膜材料として、珪素原子を含有するポリマーを含まないものを用いて、かつ、前記珪素含有中間層膜又は前記無機ハードマスク中間層膜をマスクにして行う前記レジスト下層膜のエッチングを、酸素ガス又は水素ガスを含有するエッチングガスを用いて行うことを特徴とする請求項9から請求項13のいずれか一項に記載のパターン形成方法。
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KR102060854B1 (ko) | 2019-12-30 |
JP6502885B2 (ja) | 2019-04-17 |
TWI597308B (zh) | 2017-09-01 |
US20160342088A1 (en) | 2016-11-24 |
KR20160135669A (ko) | 2016-11-28 |
TW201704277A (zh) | 2017-02-01 |
US9984878B2 (en) | 2018-05-29 |
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