CN100483612C - 用于制造垂直结构的复合半导体器件的方法 - Google Patents

用于制造垂直结构的复合半导体器件的方法 Download PDF

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CN100483612C
CN100483612C CNB2004800186202A CN200480018620A CN100483612C CN 100483612 C CN100483612 C CN 100483612C CN B2004800186202 A CNB2004800186202 A CN B2004800186202A CN 200480018620 A CN200480018620 A CN 200480018620A CN 100483612 C CN100483612 C CN 100483612C
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刘明哲
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Abstract

一种用于制造垂直结构的光电子器件的方法,包括:在晶体衬底上制造多个垂直结构的光电子器件,然后使用激光剥离处理去除衬底。该方法然后制造金属支承结构代替衬底。在一方面中,制造金属支承结构代替衬底包括以下步骤:使用电镀和无电镀中的至少一种来电镀金属支承结构。在一方面中,垂直结构是GaN-基垂直结构,晶体衬底包括蓝宝石,并且金属支承结构包括铜。本发明的优点包括制造适于大规模生产的高可靠性和高成品率的垂直结构的LED。

Description

用于制造垂直结构的复合半导体器件的方法
技术领域
本发明涉及制造具有顶部和底部接触结构的垂直结构的复合半导体器件。
背景技术
传统地,使用绝缘蓝宝石衬底制造包括发光二极管(LED)、激光二极管(LD)、异质结双极晶体管(HBT)、高电子活动度晶体管(HEMT)的大多数GaN-基半导体器件。结果,由于必须形成顶部n-接触物以与顶部p-接触物形成电连接,因此用绝缘衬底构成的器件结构典型地被构造成横向结构(lateral structure)。
这种结构引起了多个器件性能问题,例如电流拥挤(currentcrowding)和对静电放电(ESD)的弱阻抗。当需要高电流注入用于使用高功率白色LED或者蓝色/UV LD的发光应用时,电流拥挤会变得很严重。由于在此类器件中电子被限制在n-型电极附近,因此光电器件中的光子生成相对于增加的电流注入受到限制。换句话说,功率效率受损。这是当前在市场上可用的横向器件的一个严重缺陷。
ESD问题被认为是一个严重问题,尤其是当GaN-基LED被用于高电压环境中(比如,用于汽车应用)时。一旦在器件表面发生静电放电,则横向器件经受电荷堆积,这经常导致器件在非常短的期间内失效,这是因为由于绝缘衬底而在器件中没有放电路径。
具有绝缘衬底(例如蓝宝石)的横向器件的另一个严重缺点是不良的热消散。众所周知,蓝宝石是不良的热导体。因此,当器件经历高电流注入模式时,器件寿命大大缩短。这两个缺点是GaN-基LED和LD以及蓝色/UV LD进一步发展的主要障碍。
从产品成品率(production yield)的观点出发,横向结构器件也有很多缺点。如图1所示,因为p电极和n电极均放置在同一个平面中,因此用横向结构构造的器件需要大器件尺寸。因此,器件数量由于横向器件需要的晶片基板面(real estate)的数量而受到限制。
除了上面提出的问题,众所周知,蓝宝石衬底材料是第二硬的材料,仅次于金刚石。这在晶片研磨和抛光过程中产生困难。此外,还难以从晶片分离器件。因此,即使直到前面的制造过程还可以期待高器件产出率,但最终的器件制造产量主要依赖于包括研磨(lapping,搭接)、抛光、以及管芯分离的后续制造过程。
如图2所示,近来,垂直结构的GaN-基复合半导体已经有了新的发展。已经引入激光剥离处理以从GaN外延层去除蓝宝石衬底。一些技术已经用导电或半导电第二衬底来代替绝缘蓝宝石衬底,以使用具有对蓝宝石透明的波长(典型的在UV范围内)的准分子激光器来制造垂直结构的器件。应当注意,在通过激光剥离去除蓝宝石衬底后,大多数其它技术利用晶片粘合技术以永久粘合到第二衬底。
然而,这些技术还没有产生用于VLED(垂直LED)的大规模生产的实用晶片级激光剥离处理。两个主要原因是由于支承晶片和外延层之间的粘合层(bonding adhesive layer)的分层引起的大面积激光剥离的困难。另一个问题是,由于在激光剥离后整个晶片表面的外延层表面不平,因此存在外延层和永久第二衬底之间的晶片粘合的困难。由于这些原因,激光剥离后的最终成品率受到极大阻碍,结果,根据其它技术只有小部分的晶片被制造用于垂直结构器件。
已经做出其他努力以克服制造VLED的晶片粘合问题。代替使用晶片粘合方法,图3中示出的一种其它技术附加了金属支承物。然而,众所周知,由于粘结层(bonding layer)和支承结构分层,因此激光剥离成品率非常低。如果粘合不是足够的牢固以经得起高能激光冲击波,则在激光剥离后,GaN外延层可能弯曲或破裂。一旦GaN外延层存在弯曲或破裂,则难以执行诸如清洗、脱胶、和器件分离的后续激光剥离处理。因此,即使其它加工成品率可以保持非常高,但是最终器件加工成品率却变得非常低。这些问题主要归因于使用的临时晶片粘合技术和非优化的激光处理技术。
如图3所示,基于另一种技术的传统垂直器件的另一个问题是不良的器件性能。由于经常在蓝宝石衬底上使用喷砂处理(sandblasting)来产生均匀的激光束能量分布,因此GaN表面在激光剥离后非常粗糙,这导致器件的不良反射率。另外,形成在n-GaN层上的金属反射层达不到非金属反射材料(例如ITO)的高度。
因此,需要一种用于制造垂直结构的复合半导体器件的方法,其能够提供可靠和可重复的激光剥离处理同时获得高器件性能,以将激光剥离处理应用于垂直结构的器件的制造。
发明内容
本发明提供了一种用于制造新型垂直结构的复合半导体器件的改进的技术,其使用改进的激光剥离处理用于GaN-基复合半导体器件的大规模生产。本发明的一个方面采用双粘合处理用于临时粘接到支承晶片,并且除使用具有一定外延厚度晶片的GaN初始缓冲层之外,还使用AlGaN缓冲层,以确保可靠和可重复的激光剥离处理。
在一个实施例中,本发明描述了一种制造方法,用于通过优化激光剥离处理和金属化处理来构造垂直结构的复合半导体用于大规模生产。第一,为了防止在激光剥离期间聚合体-基粘合剂的热损伤,除了传统的GaN或者AlN缓冲层之外,还使用充当扩散阻挡物(diffusion barrier)的AlGaN缓冲层和厚GaN外延层(>5μm)。第二,使用双粘合技术,以减少由高能激光冲击波引起的损伤,并有助于使脱胶处理变得容易。第三,在GaN外延层和厚金属支承层之间设置铟锡氧化物(ITO)薄膜,以获得垂直器件的高效率的光性能和电性能。最后,使用分级的Cu合金-基厚金属支承层,以获得垂直器件的良好的机械支承、高电导率、以及良好的热消散。
本发明的优点包括制造适于大规模生产的高可靠性和高成品率的垂直结构的LED。本发明在激光剥离处理之前使用双粘合处理,以使外延层和支承晶片在激光剥离后易于分离,并使用AlGaN阻尼层预防激光束的高能冲击波。该附加缓冲层减少了由照射在薄外延薄膜上的高能激光束引起的破裂的产生。
附图说明
参考以下的附图对本发明进行描述,其中:
图1示出传统横向结构的GaN-基LED,其中,两个金属接触物形成在器件的顶部;
图2是根据另一传统技术的垂直结构的GaN-基LED,其中,在去除原始蓝宝石衬底后,使用金属粘结层将GaN薄膜粘合到第二衬底(诸如Si、GaAs等)上;
图3是根据另一传统技术的垂直结构的GaN-基LED,其中,在去除原始蓝宝石衬底后,将厚金属层沉积到GaN薄膜上代替晶片粘合;
图4是根据本发明的垂直结构的GaN-基LED,其中,AlGaN第二缓冲层被添加到初始GaN/AlN缓冲层和中间Au层,并且在去除原始蓝宝石衬底后,将厚铜合金层沉积到ITO(铟锡氧化物)接触层;
图5示出在激光剥离之前,使用胶/环氧树脂双粘附层附着到蓝宝石支承晶片上的GaN-LED晶片;
图6示出使用扩散板穿过蓝宝石衬底的激光;
图7示出在激光剥离后去除蓝宝石衬底;
图8示出去除Ga滴和清洗表面,以及形成透明ITO反射层/接触层;
图9示出在ITO接触层上沉积Au中间层和厚铜合金金属支承层;
图10示出脱胶粘附胶/环氧树脂层以及去除蓝宝石支承物;
图11示出通过化学或者激光划片进行器件分离;以及
图12示出根据本发明的实施例的最终垂直器件结构。
具体实施方式
根据特定方法、技术、器件结构、和实施例对本发明进行描述。本领域内的技术人员将会发现,该描述用于说明以及提供实施本发明的最好的模式。此外,参数、厚度、温度等被提供用于描述用于实施本发明的最好的模式,并不用于限制本发明。
图4至图12示出根据本发明的使用激光剥离处理制造垂直结构的GaN-基LED 100的过程。本实施例使用激光剥离处理来去除原始衬底,然后使用金属沉积处理,以形成金属衬底用于机械支承和电传导。本发明中描述的制造方法不限于LED,而是能够扩展到包括生长在绝缘衬底的GaN-基外延薄膜的任何器件结构,例如,激光二极管(LD)、异质结双极晶体管(HBT)、高电子活动晶体管(HEMT)。这些应用是示例性的,因为还可以进一步理解,本发明能够应用于另外的或其它的材料。
如图5所示,GaN-基LED结构150A-150F生长在带有适当外延生长设备(诸如金属有机化学气相沉积(MOCBVD)、分子束外延(MBE)、或者气相外延(VPE)等)的蓝宝石晶片200上。与其中单层GaN或者AlN是公用缓冲层的传统技术相反,除了GaN或AlN缓冲层116之外,本发明还使用AlGaN缓冲层114。AlGaN层114用于创建热障(thermal barrier)。在激光剥离处理期间,在GaN外延层和粘合层之间交界处,温度可增加到250C。因此,由于热积累,在激光剥离期间,聚合体-基粘附层很可能会损坏GaN外延层并且与其反应,这使得难以在脱胶处理期间去除热损坏的粘合剂。本发明使用AlGaN有助于减少粘合剂损坏,因此提高器件产品成品率。另外,将总外延层的厚度设置到一定厚度,以防止在GaN/粘合剂交界处温度升高。有利地,为了将界面温度维持在200C以下,将外延层厚度选择为大于5μm。为了实现此目标,n-GaN层生长超过4μm厚。可以理解其它的厚度和温度变化。
外延生长之后,制造处理包括在GaN外延层上执行金属化和钝化层形成,以形成金属接触件并提供保护层。特别地,如图5所示,从GaN LED层通过蓝宝石衬底形成沟道160。以这种方式设计沟道,以减轻在激光剥离期间GaN外延层116和蓝宝石衬底200之间的压缩应力,这样,使得GaN外延层在激光剥离期间的破裂或弯曲最小化。沟道尺寸被设计成同激光束光斑大小(比如7×7mm)一样,以减轻在激光剥离处理期间产生的冲击波。沟道有利地窄于约100μm宽,并以小于2μm延伸到蓝宝石衬底中。沟道有利地使用反应离子刻蚀来形成,优选地是Ar和Cl2或BCl3气体混合物的感耦等离子体反应离子刻蚀(ICP RIE)。在完成制造处理后,蓝宝石衬底的背面在激光剥离前被研磨和抛光,以获得平滑的表面。
再次参见图5,为了在通过激光剥离去除蓝宝石衬底之后保持非常薄的GaN外延薄膜,完全处理过的具有蓝宝石衬底200的GaN-基LED晶片被粘合到临时的支承晶片。在本发明中,使用胶220和环氧树脂230的两层临时粘结剂。使用双粘合技术有两个原因。第一个原因是,减少由高能激光束的冲击波产生的损害。如果粘合很薄或者很弱,则在激光剥离后GaN外延层经常由于激光束冲击波而产生大量的破裂和弯曲外延层,这极大地降低了激光剥离处理成品率。第二个原因是,通过使用具有溶剂可溶的超级胶的第一粘结层和具有高粘结强度和较高冲击波阻抗的第二层,有助于使脱胶处理变得较容易。因为超级胶对冲击波具有弱粘结强度和阻抗,因此将SU-8 5环氧树脂涂于第一超级胶粘结层。由于同超级胶相比,Su-8对冲击波具有更高的粘结强度和更大的阻抗,因此Su-8一旦被完全固化则难以将其去除。
通过使用多重旋转的旋涂(spin coating)来涂超级胶层,以使超级胶层的厚度维持在约30μm的厚度。在超级胶粘合后,使用旋涂以厚于约20微米的厚度在超级胶层顶部涂SU-8 5。用UV灯通过蓝宝石支承晶片210来固化SU-8 5。由于SU-8 5由UV光固化,因此使用UV光透明的蓝宝石支承物对固化SU-8 5环氧树脂是有用的。提供临时晶片粘合的如下详细处理步骤用于阐明最好的模式。
超级胶粘合处理(在GaN/蓝宝石晶片200上);
1.将GaN/蓝宝石晶片浸泡在丙酮中,然后浸泡在异丙醇中,用N2吹干。
2.将GaN/蓝宝石晶片浸泡在DI(去离子的)H2O中,用N2吹干。
3.涂超级胶到晶片中心的约1/3到1/2处。
4.加速旋转涂布机到2000rmp(1~2秒)并立即减速到零。
5.检查完全覆盖;如果没有被完全覆盖,则用超级胶填充空区域并重复步骤4。
6.一旦晶片被超级胶完全覆盖,加速到2000rpm并保持30秒。
7.减速到零并停止。
8.内层固化2分钟。
9.重复步骤3到9以获得5个涂层。
10.在建议时间内固化超级胶(过夜固化)。
SU-8 5粘合处理(在蓝宝石支承晶片210上);
1.将蓝宝石支承晶片浸泡在丙酮中,然后浸泡在异丙醇中,然后浸泡在DI H2O中,用N2吹干
2.脱水烘干蓝宝石支承晶片和涂布有超级胶的GaN/蓝宝石晶片
2.1 用热盘在120C加热支承晶片10分钟
2.2 从热盘移开,并冷却2分钟
3.用注射器注射SU-8 5到蓝宝石支承晶片(抛光面)或者GaN/蓝宝石晶片(超级胶面)
4.在SU-8 5滴的上部放置其它晶片,并允许自然地散布环氧树脂
5.用镊子施加缓和的压力;过量SU-8 5从周围挤出,其随后可以用刀片或者晶片切边器很容易地去除
6.软烘干以去除溶剂:
6.1.对于1/4晶片(在热盘上)
6.1.1.  70C—2.5分钟
6.1.2.  90C—5分钟
6.1.3.  70C—2分钟
6.1.4.  在洁净的表面上冷却
6.2     对于1/2到整个晶片(在热盘上)
6.2.1.  70C—2.5分钟
6.2.2.  90C—10分钟
6.2.3.  70C—2分钟
6.2.4.在洁净的表面上冷却
7.  UV曝光:
7.1  使用均匀的UV源(诸如光刻机的UV灯)
7.1.1.  强度:在没有蓝宝石支承晶片的SU8 5上为7~7.5mW/cm2
7.1.2.  强度:在未抛光的蓝宝石支承晶片上为5.0mW/cm2
7.2.  15μm厚的薄膜需要约200mJ/cm2剂量(在此强度为40秒)
7.3.  在薄膜较厚的情况下曝光120秒(或20分钟的最大值曝光)
8.硬烘干,用于增加SU8 5和超级胶之间的交联:
8.1.1.  70C—1分钟
8.1.2.  90C—2分钟
8.1.3.  在清洁的表面上冷却
参见图6,使用248nm的KrF紫外线(UV)准分子激光器用于激光剥离。该示例性激光器的脉冲持续时间是38ns。选择此波长的原因在于,为了在GaN/蓝宝石界面处将GaN分解成金属Ga和气体氮(N2),激光应该能够传输穿过蓝宝石,并在GaN外延层中被吸收。选择具有7×7mm方束的激光束,并且光束功率密度在600~1,200mJ/cm2之间。还发现所需的激光束能量密度强烈地依赖于蓝宝石衬底表面的表面粗糙度。为了在激光剥离后获得光滑的GaN表面,使用高于800mJ/cm2的光束能量。可以理解,可以改变这些参数以获得好的结果。
基于上述的经验,发现蓝宝石衬底的表面粗糙度是用于在激光剥离后获得光滑的GaN表面的一个重要过程参数。如果在激光剥离期间使用未抛光的蓝宝石表面,则GaN表面非常粗糙,这导致在形成最终器件后由于粗糙表面的不良反射率引起的LED器件的不良光输出。然而,如果使用抛光表面,则能够获得非常光滑的GaN表面,因此能获得较高的光输出。然而,由于激光束局部的在抛光的蓝宝石表面上,则同具有较小的激光束能量的区域相比,用较高的激光束能量照射的区域通常导致在GaN表面的破裂。因此,为了获得高产量的激光剥离处理并同时获得高器件性能,选择蓝宝石晶片的最佳表面粗糙度是重要的。根据传统的技术,喷砂处理通常用于在抛光的蓝宝石表面获得均匀激光束分布,然而,喷砂处理非常不可靠并且不可重复以每次获得相同的表面粗糙度。本发明中,在激光束和蓝宝石衬底之间放置用对248nm的UV激光透明的材料制成的扩射板,以在蓝宝石表面获得均匀激光束功率分布,从而提高激光剥离处理产量。扩射板的表面粗糙度rms(均方根)优选地设置为小于30μm,并且使用蓝宝石用于扩射体。
如图7所示,激光剥离后,在激光剥离期间由GaN分解产生的过量Ga滴用HCl溶液(HCl:H2O=1:1,室温)或者煮沸的HCl蒸汽清洗30秒。由于Ga在室温融化,因此Ga在激光剥离期间以液态形成,并且能够容易地用酸溶液清洗掉。用酸清洗过的GaN表面进一步用干刻蚀清洁,有利地使用感耦反应离子刻蚀(ICP RIE)。为了制造原子平坦表面,还对剥离的n-GaN表面执行ICP抛光。由于使用如图8所示的较高反射表面可增加光输出,因此平坦表面对于产生随后被沉积的反射结构的高反射率是重要的。
对于增加光提取和改善垂直结构器件的电气性能而言,获得良好的光学反射率和电接触特性是重要的。为了满足这些需要,优选地使用ITO(铟锡氧化物)薄膜用于图8所示的n-接触层和反射层。即使ITO是透明的非金属接触物,其能够形成到n-GaN的良好n-型接触,这可以与用于其它技术的Ti/Al相提并论。此外,ITO薄膜的高反射率用于形成垂直结构的反射器是理想的。众所周知,ITO的反射率超过90%,而传统技术使用的金属薄膜的最好反射率已知最大的是60~70%。使用电子束蒸发在清洁的n-GaN表面沉积透明的导电和反射ITO薄膜。ITO薄膜厚度选择在75~150nm范围内,以获得最佳反射率。
为了制造具有带有厚、软金属薄膜支承层(~100μm)的薄、硬GaN外延层(小于10μm)的垂直结构的器件,如图9所示,在两层之间形成中间层120以减少可能积累在GaN外延层150和金属层122-126之间的交界处的压缩应力是重要的。设置中间层120的另一个原因是,金属中间层比直接对非金属ITO表面执行电镀产生更好的电镀特性。在不从真空室去除晶片的情况下,使用电子束蒸发器将大约1-μm厚的金(Au)薄膜120连续地沉积到ITO表面118上。在原位置的连续层沉积对防止污染是有用的,其对在ITO和Au层之间形成良好的薄膜粘附是重要的。为了进一步改善ITO和Au之间的粘附,在ITO和Au层之间沉积30~50nm厚的Cr粘附层。
在图9中,通过电镀或无电镀(electroless plating,也称化学镀)沉积厚金属支承层120-126。使用电镀或者无电镀,这是因为同传统的沉积方法相比,其是一种快速和廉价的沉积技术。在成本效率方面,这对于垂直结构的器件的大规模生产是重要的。支承层的主要功能在于,支承层120-126不仅为薄GaN外延层提供良好的刚性机械支承,而且还提供良好的电传导和热消散。为了满足这些需要,在Au/Cr粘附层上沉积分级的Cu合金层。
在Cu合金层之前沉积第一Au缓冲层120。Au层120能够通过诸如真空蒸发等技术来形成。沉积Au层120以提高现有层和Cu合金层之间的粘附度。电镀初始的硫酸盐-基软铜层,以逐渐软化由于厚金属层引起的应力积累。将初始的软Cu合金层厚度设置到~10μm。将镀覆速率设置到3~5μm/小时,以形成密集和均匀的Cu镀层。靠近软Cu层122电镀硬Cu层124以提供结构刚度。硬Cu镀的镀覆速率高达20μm/小时。对于Cu合金镀来说,含有锡(Sn)和铁(Fe)的金属合金的镀溶液和Cu硫酸盐溶液混合,以提高Cu支承层的机械强度和电导率。Cu合金支承层的总厚度是70~90μm(图9)。在Cu合金镀结束时,电镀了0.5~1μm厚的Au层,以防止Cu合金层被氧化。在用于封装垂直器件的芯片粘合处理和引线接合处理期间,Au保护层126对于在单个芯片和金属-基环氧树脂之间获得良好的粘附是重要的。
厚金属沉积之后,使用溶剂从GaN/金属支承晶片将蓝宝石支承晶片210去除,并且结果在图10示出。此脱胶处理包括以下步骤:将GaN/金属晶片浸泡在丙酮中3~5小时,以从支承蓝宝石晶片溶解超级胶层。为了使得脱胶处理容易和快速,积累在蓝宝石晶片边缘的过量金属用机械方法修整,比如修边器或者刀片。还可以使用化学处理。通过去除过量金属,溶剂能够更容易的渗透到超级胶层内部并加速脱胶处理。分离的GaN/金属晶片在超声波清洁器中被进一步浸泡并用异丙醇清洗。使用冲洗和干燥剂用DI水进一步清洗GaN器件表面。
如图11所示,图10的晶片被支承在薄膜410上,单个器件通过划线片切成小方块,这可以使用化学或者激光处理来执行。图12示出根据本发明的实施例的最终垂直器件结构。结果是相对于其它传统制造技术具有高产量的高质量激光二极管。
本发明的优点包括制造适于大规模生产的具有高可靠性和高产量的垂直结构的LED。本发明在激光剥离处理之前使用双粘合处理,以便在激光剥离后容易分离外延层和支承晶片,并使用AlGaN阻尼层来预防激光束的高能冲击波。这个附加的缓冲层减少了由照射薄外延薄膜的高能激光束引起的破裂的产生。
以上所述仅为本发明的优选实施例而已,并不用于限制本发明,对于本领域的技术人员来说,本发明可以有各种更改和变化。凡在本发明的精神和原则之内,所作的任何修改、等同替换、改进等,均应包含在本发明的权利要求范围之内。

Claims (34)

1.一种制造垂直结构的光电子器件的方法,包括以下步骤:
在晶体衬底上制造多个垂直结构的光电子器件;
使用激光剥离处理去除所述晶体衬底;以及
制造金属支承结构代替所述晶体衬底,其中,所述制造金属支承结构代替所述晶体衬底的步骤包括以下步骤:
沉积形成n-接触层的铟锡氧化物层,
在所述铟锡氧化物层上沉积Au缓冲层,
使用电镀和无电镀中的至少一种在所述Au缓冲层上镀Cu层,其中,所述垂直结构光电子器件是GaN-基垂直结构,所述晶体衬底包括蓝宝石,并且其中,所述GaN-基垂直结构包括缓冲层,所述缓冲层除了包括GaN缓冲层或AlN缓冲层,还包括AlGaN缓冲层,以提供热扩散阻挡物来保护聚合体-基粘合层,以及
其中,根据如下规则通过所述晶体衬底从所述GaN缓冲层形成沟道:
a)沟道尺寸大致类似于激光束光斑尺寸,以在激光剥离处理期间减轻冲击波,
b)所述沟道窄于大约100微米宽,并延伸到所述晶体衬底中不深于约3微米,以及
c)使用反应离子刻蚀来形成所述沟道。
2.一种制造垂直结构的光电子器件的方法,包括以下步骤:
在晶体衬底上制造多个垂直结构的光电子器件;
使用激光剥离处理去除所述晶体衬底;以及
制造金属支承结构代替所述晶体衬底,其中,所述制造金属支承结构代替所述晶体衬底的步骤包括以下步骤:
沉积形成n-接触层的铟锡氧化物层,
在所述铟锡氧化物层上沉积Au缓冲层,
使用电镀和无电镀中的至少一种在所述Au缓冲层上镀Cu层,其中,所述垂直结构光电子器件是GaN-基垂直结构,所述晶体衬底包括蓝宝石,并且其中,所述GaN-基垂直结构包括缓冲层,所述缓冲层除了包括GaN缓冲层或AlN缓冲层,还包括AlGaN缓冲层,以提供热扩散阻挡物来保护聚合体-基粘合层,以及
为了减轻冲击波并易于在激光剥离处理后的脱胶处理期间的分层,根据以下步骤对使用聚合体-基粘合剂的粘合层进行双涂布,其中,所述聚合体-基粘合剂包括GaN外延层和支承晶片之间的超级胶和可曝光的聚合体:
a)使用旋涂来涂超级胶层,
b)所述超级胶层的厚度为大约30微米厚,
c)同样使用旋涂以厚于20微米的厚度涂所述可曝光的聚合体,
d)用UV灯固化所述可曝光的聚合体,以及
e)使用UV灯透明蓝宝石支承物来固化所述可曝光的聚合体。
3.一种制造垂直结构的光电子器件的方法,包括以下步骤:
在晶体衬底上制造多个垂直结构的光电子器件;
使用激光剥离处理去除所述晶体衬底;以及
制造金属支承结构代替所述晶体衬底,其中,所述制造金属支承结构代替所述晶体衬底的步骤包括以下步骤:
沉积形成n-接触层的铟锡氧化物层,
在所述铟锡氧化物层上沉积Au缓冲层,
使用电镀和无电镀中的至少一种在所述Au缓冲层上镀Cu层,其中,所述垂直结构光电子器件是GaN-基垂直结构,所述晶体衬底包括蓝宝石,以及
在激光束和所述晶体衬底之间使用由对于所述激光束透明的材料制成的扩散板,以获得均匀的激光束功率分布。
4.一种制造垂直结构的光电子器件的方法,包括以下步骤:
在晶体衬底上制造多个垂直结构的光电子器件;
使用激光剥离处理去除所述晶体衬底;以及
制造金属支承结构代替所述晶体衬底,其中,所述制造金属支承结构代替所述晶体衬底的步骤包括以下步骤:
沉积形成n-接触层的铟锡氧化物层,
在所述铟锡氧化物层上沉积Au缓冲层,
使用电镀和无电镀中的至少一种在所述Au缓冲层上镀Cu层,其中,所述垂直结构光电子器件是GaN-基垂直结构,所述晶体衬底包括蓝宝石,以及
沉积Cu合金层,以逐渐软化由于厚金属层积累的应力,其中,初始Cu合金层的厚度设置到~10μm,并且其中,镀覆速率设置到3~5μm/小时。
5.根据权利要求4所述的方法,进一步包括以下步骤:沉积Cu层以提供结构刚度,其中,Cu镀的镀覆速率高达20μm/小时,其中,对于所述Cu合金镀,包含锡和铁的金属合金电镀溶液与Cu硫酸盐溶液混合,以提高Cu合金支承层的机械强度和导电率,其中,所述Cu合金支承层的总厚度是70~90μm,并且其中,在所述Cu合金镀结束时,电镀0.5~1μm厚的Au缓冲层以防止Cu合金层氧化。
6.一种制造垂直结构的光电子器件的方法,包括以下步骤:
在晶体衬底上制造多个垂直结构的光电子器件;
使用激光剥离处理去除所述晶体衬底;以及
制造金属支承结构代替所述晶体衬底;其中,所述垂直结构光电子器件是GaN-基垂直结构光电子器件,所述晶体衬底包括蓝宝石,所述金属支承结构包括Cu,并且其中,所述GaN-基垂直结构光电子器件包括缓冲层,所述缓冲层除了包括GaN缓冲层或AlN缓冲层,还包括AlGaN缓冲层,以提供热扩散阻挡物来保护聚合体-基粘合层,以及
其中,根据如下规则通过所述晶体衬底从所述GaN缓冲层形成沟道:
a)沟道尺寸大致类似于激光束光斑尺寸,以在激光剥离处理期间减轻冲击波,
b)所述沟道窄于大约100微米宽,并延伸到所述晶体衬底中不深于约3微米,以及
c)使用反应离子刻蚀来形成所述沟道。
7.一种制造垂直结构的光电子器件的方法,包括以下步骤:
在晶体衬底上制造多个垂直结构的光电子器件;
使用激光剥离处理去除所述晶体衬底;以及
制造金属支承结构代替所述晶体衬底;其中,所述垂直结构光电子器件是GaN-基垂直结构光电子器件,所述晶体衬底包括蓝宝石,所述金属支承结构包括Cu,并且其中,所述GaN-基垂直结构光电子器件包括缓冲层,所述缓冲层除了包括GaN缓冲层或AlN缓冲层,还包括AlGaN缓冲层,以提供热扩散阻挡物来保护聚合体-基粘合层,以及
其中,为了减轻冲击波并易于在激光剥离处理后的脱胶处理期间的分层,根据以下步骤对使用聚合体-基粘合剂的粘合层进行双涂布,其中,所述聚合体-基粘合剂包括GaN外延层和支承晶片之间的超级胶和可曝光的聚合体:
a)使用旋涂来涂超级胶层,
b)所述超级胶层的厚度为大约30微米厚,
c)同样使用旋涂以厚于20微米的厚度涂所述可曝光的聚合体,
d)用UV灯固化所述可曝光的聚合体,以及
e)使用UV灯透明蓝宝石支承物来固化所述可曝光的聚合体。
8.一种制造垂直结构的光电子器件的方法,包括以下步骤:
在晶体衬底上制造多个垂直结构的光电子器件;
使用激光剥离处理去除所述晶体衬底;
制造金属支承结构代替所述晶体衬底;其中,所述垂直结构光电子器件是GaN-基垂直结构光电子器件,所述晶体衬底包括蓝宝石,所述金属支承结构包括Cu,并且其中,所述GaN-基垂直结构光电子器件包括缓冲层,所述缓冲层除了包括GaN缓冲层或AlN缓冲层,还包括AlGaN缓冲层,以提供热扩散阻挡物来保护聚合体-基粘合层;以及
在激光束和所述晶体衬底之间使用由对于所述激光束透明的材料制成的扩散板,以获得均匀的激光束功率分布。
9.一种制造垂直结构的光电子器件的方法,包括以下步骤:
在晶体衬底上制造多个垂直结构的光电子器件;
使用激光剥离处理去除所述晶体衬底;以及
制造金属支承结构代替所述晶体衬底;其中,所述垂直结构光电子器件是GaN-基垂直结构光电子器件,所述晶体衬底包括蓝宝石,所述金属支承结构包括Cu,并且其中,所述GaN-基垂直结构光电子器件包括缓冲层,所述缓冲层除了包括GaN缓冲层或AlN缓冲层,还包括AlGaN缓冲层,以提供热扩散阻挡物来保护聚合体-基粘合层;以及
沉积Cu合金层,以逐渐软化由于厚金属层积累的应力,其中,初始Cu合金层的厚度设置到~10μm,并且其中,镀覆速率设置到3~5μm/小时。
10.一种制造垂直结构的光电子器件的方法,包括以下步骤:
在晶体衬底上制造多个垂直结构的光电子器件;
使用激光剥离处理去除所述晶体衬底;以及
制造金属支承结构代替所述晶体衬底;其中,所述垂直结构光电子器件是GaN-基垂直结构光电子器件,所述晶体衬底包括蓝宝石,所述金属支承结构包括Cu,并且其中,所述GaN-基垂直结构光电子器件包括缓冲层,所述缓冲层除了包括GaN缓冲层或AlN缓冲层,还包括AlGaN缓冲层,以提供热扩散阻挡物来保护聚合体-基粘合层;以及
沉积Cu层以提供结构刚度,其中,Cu镀的镀覆速率高达20μm/小时,其中,对于所述Cu合金镀,包含锡和铁的金属合金电镀溶液与Cu硫酸盐溶液混合,以提高Cu合金支承层的机械强度和导电率,其中,所述Cu合金支承层的总厚度是70~90μm,并且其中,在所述Cu合金镀结束时,电镀0.5~1μm厚的Au缓冲层以防止Cu合金层氧化。
11.一种制造垂直结构的光电子器件的方法,包括以下步骤:
在晶体衬底上制造多个垂直结构的光电子器件;
使用激光剥离处理去除所述晶体衬底;以及
制造金属支承结构代替所述晶体衬底;其中,所述垂直结构光电子器件是GaN-基垂直结构光电子器件,所述晶体衬底包括蓝宝石,以及所述金属支承结构包括Cu;
其中,去除所述晶体衬底的步骤包括:在激光束和所述晶体衬底之间沉积由对于所述激光束透明的材料制成的扩散板,以获得均匀的激光束功率分布。
12.根据权利要求11所述的方法,其中,所述制造所述金属支承结构代替所述晶体衬底的步骤包括以下步骤:使用电镀和无电镀中的至少一种镀所述金属支承结构。
13.根据权利要求11所述的方法,进一步包括以下步骤:
在所述多个垂直结构光电子器件和所述金属支承结构之间制造缓冲层。
14.根据权利要求11所述的方法,所述制造金属支承结构代替所述晶体衬底的步骤包括以下步骤:
沉积形成n-接触层的铟锡氧化物层,
在所述铟锡氧化物层上沉积Au缓冲层,以及
使用电镀和无电镀中的至少一种在所述Au缓冲层上镀Cu层。
15.根据权利要求11所述的方法,其中,所述GaN-基垂直结构光电子器件包括缓冲层,所述缓冲层除了包括GaN缓冲层或AlN缓冲层,还包括AlGaN缓冲层,以提供热扩散阻挡物来保护聚合体-基粘合层。
16.根据权利要求15所述的方法,其中,根据以下规则通过所述晶体衬底从所述GaN缓冲层形成沟道:
a)沟道尺寸大致类似于激光束光斑尺寸,以在激光剥离处理期间减轻冲击波,
b)所述沟道窄于大约100微米宽,并延伸到所述晶体衬底中不深于约3微米,以及
c)使用反应离子刻蚀形成所述沟道,所述反应离子蚀刻优选地是感耦等离子反应离子蚀刻。
17.根据权利要求15所述的方法,其中,为了减轻冲击波并易于在激光剥离处理后的脱胶处理期间的分层,根据以下步骤对使用聚合体-基粘合剂的粘合层进行双涂布,其中,所述聚合体-基粘合剂包括GaN外延层和支承晶片之间的超级胶和可曝光的聚合体:
a)使用旋涂来涂超级胶层,
b)所述超级胶层的厚度为大约30微米厚,
c)同样使用旋涂以厚于20微米的厚度涂所述可曝光的聚合体,
d)用UV灯固化所述可曝光的聚合体,以及
e)使用UV灯透明蓝宝石支承物来固化所述可曝光的聚合体。
18.根据权利要求11所述的方法,进一步包括以下步骤:在剥离的GaN晶片上执行感耦等离子反应离子蚀刻和抛光,其中,
所述感耦等离子反应离子蚀刻和抛光暴露并产生纯n-GaN的原子平坦表面,并且其中,所述纯n-GaN的原子平坦表面对产生随后沉积的反射结构的高反射率尤其有益。
19.根据权利要求11所述的方法,进一步包括以下步骤:使用电子束蒸发在所述金属支承结构的底部上沉积透明的导电反射层,其中,优选地将铟锡氧化物用于n-接触层和反射层。
20.根据权利要求11所述的方法,进一步包括以下步骤:沉积Cu合金层,以逐渐地软化由于厚金属层积累的应力,其中,初始Cu合金层的厚度设置到~10μm,并且其中,镀覆速率设置到3~5μm/小时。
21.根据权利要求20所述的方法,进一步包括以下步骤:沉积Cu层以提供结构刚度,其中,Cu镀的镀覆速率高达20μm/小时,其中,对于Cu合金镀,包含锡和铁的金属合金电镀溶液与Cu硫酸盐溶液混合,以提高Cu合金支承层的机械强度和导电率,其中,所述Cu合金支承层的总厚度是70~90μm,并且其中,在所述Cu合金镀结束时,电镀0.5~1μm厚的Au缓冲层以防止Cu合金支承层被氧化。
22.根据权利要求11所述的方法,进一步包括以下步骤:通过化学或者激光划片来切割单个器件。
23.一种制造垂直结构的光电子器件的方法,包括以下步骤:
在晶体衬底上制造多个垂直结构的光电子器件;
使用激光剥离处理去除所述晶体衬底;以及
制造金属支承结构代替所述晶体衬底,其中,所述垂直结构光电子器件是GaN-基垂直结构光电子器件,所述晶体衬底包括蓝宝石,以及通过沉积Cu合金层来形成所述金属支承结构,以逐渐地软化由于厚金属层积累的应力,其中,初始Cu合金层的厚度设置到~10μm,并且其中,镀覆速率设置到3~5μm/小时。
24.根据权利要求23所述的方法,其中,所述制造所述金属支承结构代替所述晶体衬底的步骤使用电镀或者无电镀中的至少一种。
25.根据权利要求23所述的方法,进一步包括以下步骤:
在所述多个垂直结构光电子器件和所述金属支承结构之间制造缓冲层。
26.根据权利要求23所述的方法,其中,所述制造所述金属支承结构代替所述晶体衬底的步骤包括以下步骤:
沉积形成n-接触层的铟锡氧化物层,
在所述铟锡氧化物层上沉积Au缓冲层,
使用电镀或者无电镀中的至少一种在所述Au缓冲层上镀Cu合金层。
27.根据权利要求23所述的方法,其中,所述GaN-基垂直结构光电子器件包括缓冲层,所述缓冲层除了包括GaN缓冲层或AlN缓冲层,还包括AlGaN缓冲层,以提供热扩散阻挡物来保护聚合体-基粘合层。
28.根据权利要求27所述的方法,其中,根据以下规则通过所述晶体衬底从所述GaN缓冲层形成沟道:
a)沟道尺寸大致类似于激光束光斑尺寸,以在激光剥离处理期间减轻冲击波,
b)所述沟道窄于大约100微米宽,并延伸到所述晶体衬底中不深于约3微米,以及
c)使用反应离子刻蚀来形成所述沟道,优选地是感耦等离子反应离子蚀刻。
29.根据权利要求27所述的方法,其中,为了减轻冲击波并易于在激光剥离处理后的脱胶处理期间的分层,根据以下步骤对使用聚合体-基粘合剂的粘合层进行双涂布,其中,所述聚合体-基粘合剂包括GaN外延层和支承晶片之间的超级胶和可曝光的聚合体:
a)使用旋涂来涂超级胶层,
b)所述超级胶层的厚度为大约30微米厚,
c)同样使用旋涂以厚于20微米的厚度涂所述可曝光的聚合体,
d)用UV灯固化所述可曝光的聚合体,以及
e)使用UV灯透明蓝宝石支承物来固化所述可曝光的聚合体。
30.根据权利要求23所述的方法,进一步包括以下步骤:在激光束和所述晶体衬底之间使用由对激光束透明的材料制成的扩散板,以获得均匀的激光束功率分布。
31.根据权利要求23所述的方法,进一步包括以下步骤:在剥离的GaN晶片上执行感耦等离子反应离子蚀刻和抛光,其中,所述感耦等离子反应离子蚀刻和抛光暴露并产生纯n-GaN的原子平坦表面,并且其中,所述纯n-GaN的原子平坦表面对产生随后沉积的反射结构的高反射率尤其有益。
32.根据权利要求23所述的方法,进一步包括以下步骤:使用电子束蒸发在所述金属支承结构的底部上沉积透明的导电反射层,其中,优选地将铟锡氧化物用于n-接触层和反射层。
33.根据权利要求23所述的方法,进一步包括以下步骤:沉积Cu层以提供结构刚度,其中,Cu镀的镀覆速率高达20μm/小时,其中,对于Cu合金镀,包含锡和铁的金属合金电镀溶液与Cu硫酸盐溶液混合,以提高Cu合金支承层的机械强度和导电率,其中,所述Cu合金支承层的总厚度是70~90μm,并且其中,在所述Cu合金镀结束时,电镀0.5~1μm厚的Au缓冲层以防止Cu合金支承层被氧化。
34.根据权利要求23所述的方法,进一步包括以下步骤:通过化学或者激光划片来切割单个器件。
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