JP2014533890A - 電気的絶縁層を持つマイクロled構造体及びマイクロled構造体のアレイの形成方法 - Google Patents
電気的絶縁層を持つマイクロled構造体及びマイクロled構造体のアレイの形成方法 Download PDFInfo
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- JP2014533890A JP2014533890A JP2014542347A JP2014542347A JP2014533890A JP 2014533890 A JP2014533890 A JP 2014533890A JP 2014542347 A JP2014542347 A JP 2014542347A JP 2014542347 A JP2014542347 A JP 2014542347A JP 2014533890 A JP2014533890 A JP 2014533890A
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Abstract
Description
本出願は、2012年2月13日に出願した米国特許出願第13/372,422号の一部継続出願であり、2011年11月18日に出願した米国仮特許出願第61/561,706号、2012年2月3日に出願した米国仮特許出願第61/594,919号、2012年2月9日に出願した米国仮特許出願第61/597,109号、2012年2月10日に出願した米国仮特許出願第61/597,658号に基づく優先権を主張し、これらの出願の全開示を参照により本願明細書に引用する。
P=[εo/2][Vεr/d]2−−−−−(1)
ここで、εo=8.85.10-12、Vはボルト(V)単位の電極−基板間の電圧、εrは誘電定数、dはメートル(m)単位の誘電体の厚さを示す。2つのグリップ電極を使用する2極型グリッパでは、上記式の電圧(V)は、電極Aと電極Bとの間の半分の電圧になる[VA−VB]/2。基板の電位は、平均電位[VA=VB]/2が中心となる。この平均値は、通常VA=[−VB]の場合はゼロになる。
P=[εo/2][Vεr/(d+εrg)]2−−−−−(2)
sqrt(P*2/εo)=Vεr/d−−−−−(3)
Claims (30)
- マイクロLEDアレイの形成方法であって
接合層により第1の基板スタックを第2の基板スタックに接合する工程であって、
前記第1の基板スタックが、
前記第1の基板上に形成されたp−nダイオード層と、
前記p−nダイオード層上の複数の分離反射金属スタックと、前記p−nダイオード層上の前記複数の分離反射金属スタック間の横方向のパターン形成された電気的絶縁層と、備える、工程と、
前記第1の基板を除去する工程と、
前記複数の分離反射金属スタック上に複数のマイクロp−nダイオードを形成するために、前記p−nダイオード層を貫通してエッチング処理し、前記パターン形成された電気的絶縁層を前記複数のマイクロp−nダイオード間に横方向に露出させる工程と、を含む、方法。 - 前記第1の基板スタックは、前記パターン形成された電気的絶縁層上の第1の導電接合層と、前記複数の分離反射金属スタックとを含み、前記第2の基板スタックは、第2の導電接合層を含み、
前記第1の基板スタックを、前記第2の基板スタックに接合する工程は、前記第1の導電接合層を前記第2の導電接合層に接合して、合金接合層を形成することを更に含む、請求項1に記載の方法。 - 前記第1の導電接合層及び前記第2の導電接合層のうちの1つが、350℃より低い液相線温度を有し、前記合金接合層は350℃より低い液相線温度を有する、請求項2に記載の方法。
- 前記第1の導電接合層及び前記第2の導電接合層のうちの1つは、200℃より低い液相線温度を持ち、前記合金接合層は200℃より低い液相線温度を持つ、請求項2に記載の方法。
- 前記第1の導電接合層及び前記第2の導電接合層のうちの1つは、インジウム及び錫からなる群から選択された材料を含む、請求項3に記載の方法。
- 前記第1の導電接合層及び前記第2の導電接合層のうちの1つは、前記第1の導電接合層及び前記第2の導電接合層のうちの他の1つの厚さの5%以下の厚さを持つ、請求項5に記載の方法。
- 前記第1の導電接合層は、前記第1の導電接合層が前記第2の導電接合層と接触する箇所で、前記合金接合層に完全に取り込まれる、請求項2に記載の方法。
- 前記第1の導電接合層を前記第2の導電接合層と接合する工程が、前記第1の導電接合層及び前記第2の導電接合層を、前記第1の導電接合層及び前記第2の導電接合層のうちの1つの液相線温度以上の高温度で、前記第1の導電接合層及び前記第2の導電接合層を維持する工程を含む、請求項7に記載の方法。
- 前記p−nダイオード層上で反射金属スタック層をパターン形成して、前記p−nダイオード層上に、前記複数の分離反射金属スタックを形成する工程を更に含む、請求項1に記載の方法。
- 前記複数の分離反射金属スタック上に前記電気的絶縁層を成膜させる工程を更に含む、請求項9に記載の方法。
- 前記電気的絶縁層をパターン形成して、前記複数の分離反射金属スタックを露出する、複数の開口部を形成する工程を更に含む、請求項10に記載の方法。
- 第1の導電接合層を、前記パターン形成された電気的絶縁層と、前記複数の分離反射金属スタックとの上に成膜させる工程を更に含む、請求項11に記載の方法。
- 前記p−nダイオード層の前記エッチング処理工程を停止した後で、前記パターン形成された電気的絶縁層をエッチング処理して、前記複数のマイクロp−nダイオード各々の底面を露出する工程を更に含む、請求項1に記載の方法。
- 前記複数のマイクロp−nダイオードそれぞれの側面と前記底面上に共形誘電バリア層を成膜させる工程を更に含む、請求項13に記載の方法。
- 前記共形誘電バリア層は、前記マイクロp−nダイオード内の量子井戸層の側面を覆う、請求項13に記載の方法。
- 前記p−nダイオード層をエッチング処理して前記複数のマイクロp−nダイオードを形成する工程は、プラズマエッチングを含む、請求項1に記載の方法。
- 前記複数のマイクロp−nダイオードそれぞれは、最上面、底面、及び先細形状の側壁を含み、前記底面は前記最上面よりも広い、請求項16に記載の方法。
- マイクロLED構造体であって、
マイクロp−nダイオードと、
前記マイクロp−nダイオードの底面の下の反射金属スタックと、
前記反射金属スタックの側壁の一部に広がり、前記反射金属スタックを横方向に取り囲む電気的絶縁スペーサと、を備え、
前記反射金属スタックは、基板上に形成された前記マイクロp−nダイオードと接合層との間にあり、前記接合層は約350℃より低い液相線温度を有する、マイクロLED構造体。 - 前記電気的絶縁スペーサは、前記反射金属スタックの底面の一部分に広がる、請求項18に記載のマイクロLED構造体。
- 前記電気的絶縁スペーサは、前記マイクロp−nダイオードの前記底面の一部分に広がる、請求項19に記載のマイクロLED構造体。
- 前記マイクロp−nダイオードの側壁に広がり、前記マイクロp−nダイオードの前記底面に部分的に広がる共形誘電バリア層を更に備えた、請求項20に記載のマイクロLED構造体。
- 前記接合層は、インジウム−銀(InAg)合金を含む、請求項18に記載のマイクロLED構造体。
- 前記接合層は、最上面と底面と銀濃度傾斜を持ち、前記銀は、前記接合層の前記最上面の方が前記底面よりも濃度が高い、請求項22に記載のマイクロLED構造体。
- マイクロLEDを転写先基板に転写する方法であって、
転写ヘッドを、キャリア基板上に配置されたマイクロLED構造体のアレイを持つ前記キャリア基板上に配置する工程であって、各マイクロLED構造体が、
マイクロp−nダイオードと、
前記マイクロp−nダイオード底面の下の反射金属スタックと、
前記反射金属スタックの側壁の一部部分に広がり、前記反射金属スタックを横方向に取り囲む電気的絶縁スペーサと、を含み、
前記反射金属スタックは、前記マイクロp−nダイオードと前記キャリア基板上の接合層との間にある、配置する工程と、
前記マイクロLED構造体の少なくとも1つのために、前記接合層内で相転移を生成する操作を実行する工程と、
転写ヘッドにより、前記マイクロLED構造体のための前記マイクロp−nダイオードと、前記反射金属スタックと、前記電気的絶縁スペーサとをピックアップする工程と、
マイクロLED構造体のための前記マイクロp−nダイオードと、前記反射金属スタックと、前記電気的絶縁スペーサと、を転写先基板上に配置する工程と、を含む、方法。 - 前記操作は、前記接合層の液相線温度より高く前記接合層を加熱することを含む、請求項24に記載の方法。
- 前記液相線温度は200℃より低い、請求項25に記載の方法。
- 前記接合層の実質的な部分をピックアップする工程を更に含む、請求項24に記載の方法。
- 各マイクロLED構造体は、前記マイクロp−nダイオードの側壁に広がる共形誘電バリア層を更に含み、
前記転写ヘッドにより、前記マイクロLED構造体のために、前記マイクロp−nダイオードと、前記反射金属スタックと、前記電気的絶縁スペーサと、前記共形誘電バリア層とをピックアップする工程と、
前記マイクロLED構造体のために、前記マイクロp−nダイオードと、前記反射金属スタックと、前記電気的絶縁スペーサと、前記共形誘電バリア層とを前記転写先基板上に配置する工程と、を更に含む、請求項24に記載の方法。 - 前記転写ヘッドは静電気の原理に従って、前記マイクロLED構造体上でピックアップ圧力をもたらす、請求項24に記載の方法。
- 前記転写ヘッドにより前記接合層に熱を伝える工程を更に含む、請求項25に記載の方法。
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US201161561706P | 2011-11-18 | 2011-11-18 | |
US61/561,706 | 2011-11-18 | ||
US201261594919P | 2012-02-03 | 2012-02-03 | |
US61/594,919 | 2012-02-03 | ||
US201261597109P | 2012-02-09 | 2012-02-09 | |
US61/597,109 | 2012-02-09 | ||
US201261597658P | 2012-02-10 | 2012-02-10 | |
US61/597,658 | 2012-02-10 | ||
US13/372,422 | 2012-02-13 | ||
US13/372,422 US8349116B1 (en) | 2011-11-18 | 2012-02-13 | Micro device transfer head heater assembly and method of transferring a micro device |
US13/436,314 US8518204B2 (en) | 2011-11-18 | 2012-03-30 | Method of fabricating and transferring a micro device and an array of micro devices utilizing an intermediate electrically conductive bonding layer |
US13/436,260 | 2012-03-30 | ||
US13/436,314 | 2012-03-30 | ||
US13/436,260 US8573469B2 (en) | 2011-11-18 | 2012-03-30 | Method of forming a micro LED structure and array of micro LED structures with an electrically insulating layer |
PCT/US2012/064215 WO2013074370A1 (en) | 2011-11-18 | 2012-11-08 | Method of forming a micro led structure and array of micro led structures with an electrically insulating layer |
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TW201327910A (zh) | 2013-07-01 |
WO2013074372A1 (en) | 2013-05-23 |
JP6100275B2 (ja) | 2017-03-22 |
TWI568021B (zh) | 2017-01-21 |
WO2013074370A1 (en) | 2013-05-23 |
BR112014011807A2 (pt) | 2017-05-16 |
EP2780954A1 (en) | 2014-09-24 |
MX336453B (es) | 2016-01-20 |
EP2780954A4 (en) | 2015-07-22 |
TW201330320A (zh) | 2013-07-16 |
CN104106149A (zh) | 2014-10-15 |
KR101596386B1 (ko) | 2016-02-22 |
AU2012339938A1 (en) | 2014-06-05 |
TWI559572B (zh) | 2016-11-21 |
IN2014CN03711A (ja) | 2015-10-09 |
AU2012339938B2 (en) | 2015-02-19 |
KR20140112486A (ko) | 2014-09-23 |
MX2014006031A (es) | 2015-01-16 |
EP2780954B1 (en) | 2019-10-16 |
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