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    • 68. 发明授权
    • Multi-beam semiconductor laser element
    • 多光束半导体激光元件
    • US06950451B2
    • 2005-09-27
    • US10480568
    • 2002-06-14
    • Tsuyoshi TojoTomonori HinoOsamu GotoYoshifumi YabukiShinichi AnsaiShiro UchidaMasao Ikeda
    • Tsuyoshi TojoTomonori HinoOsamu GotoYoshifumi YabukiShinichi AnsaiShiro UchidaMasao Ikeda
    • H01L21/205H01S5/042H01S5/22H01S5/323H01S5/40H01S3/10H01S3/082H01S3/14H01S5/00
    • H01S5/4031H01S5/0425H01S5/32341H01S5/4087
    • A multi-beam semiconductor laser device capable of emitting respective laser beams with uniform optical output levels and enabling easy alignment is provided. This multi-beam semiconductor laser device (40) is a GaN base multi-beam semiconductor laser device provided with four laser stripes (42A, 42B, 42C and 42D) which are capable of emitting laser beams with the same wavelength. The respective laser oscillating regions (42A to 42D) are provided with a p-type common electrode (48) on a mesa structure (46) which is formed on a sapphire substrate (44), and have active regions (50A, 50B, 50C and 50D) respectively. Two n-type electrodes (52A and 52B) are provided on an n-type GaN contact layer (54) and located as common electrodes opposite to the p-type common electrode (48) on both sides of the mesa structure (46). The distance A between the laser stripe (42A) and the laser stripe (42D) is no larger than 100 μm. The distance B1 between the laser stripe (42A) and the n-type electrode (52B) is no larger than 150 μm while the distance B2 between the laser stripe (42D) and the n-type electrode (52A) is no larger than 150 μm.
    • 提供能够发射具有均匀光输出水平的各激光束并且能够容易对准的多光束半导体激光器装置。 该多光束半导体激光器件(40)是具有能够发射具有相同波长的激光束的四个激光条纹(42A,42B,42C和42D)的GaN基多光束半导体激光器件。 相应的激光振荡区域(42A至42D)在形成在蓝宝石衬底(44)上的台面结构(46)上设置有p型公共电极(48),并具有活性区域(50A, 50B,50C和50D)。 在n型GaN接触层(54)上设置两个n型电极(52A和52B),并且位于与台面结构(46)的两侧的p型公共电极(48)相对的公共电极 )。 激光条纹(42A)与激光条纹(42D)之间的距离A不大于100μm。 激光条纹(42A)和n型电极(52B)之间的距离B 1 <1>不大于150μm,而激光之间的距离B 2 <2> 条纹(42D)和n型电极(52A)不大于150μm。
    • 69. 发明授权
    • Nitride semiconductor wafer and method of processing nitride semiconductor wafer
    • 氮化物半导体晶片和氮化物半导体晶片的加工方法
    • US06875082B2
    • 2005-04-05
    • US10665483
    • 2003-09-22
    • Masahiro NakayamaNaoki MatsumotoKoshi TamamuraMasao Ikeda
    • Masahiro NakayamaNaoki MatsumotoKoshi TamamuraMasao Ikeda
    • B24B37/00C30B29/38H01L21/20H01L21/304H01L21/306H01L21/02
    • H01L21/02008B24B37/08H01L21/02024Y10S438/959
    • Nitride semiconductor wafers which are produced by epitaxially grown nitride films on a foreign undersubstrate in vapor phase have strong inner stress due to misfit between the nitride and the undersubstrate material. A GaN wafer which has made by piling GaN films upon a GaAs undersubstrate in vapor phase and eliminating the GaAs undersubstrate bends upward due to the inner stress owing to the misfit of lattice constants between GaN and GaAs. Ordinary one-surface polishing having the steps of gluing a wafer with a surface on a flat disc, bringing another surface in contact with a lower turntable, pressing the disc, rotating the disc, revolving the turntable and whetting the lower surface, cannot remedy the inherent distortion. The Distortion worsens morphology of epitaxial wafers, lowers yield of via-mask exposure and invites cracks on surfaces. Nitride crystals are rigid but fragile. Chemical/mechanical polishing has been requested in vain. Current GaN wafers have roughened bottom surfaces, which induce contamination of particles and fluctuation of thickness.Circular nitride wafers having a diameter larger than 45 mm are made and polished. Gross-polishing polishes the nitride wafers in a pressureless state with pressure less than 60 g/cm2 by lifting up the upper turntable for remedying distortion. Distortion height H at a center is reduced to H≦12 μm. Minute-polishing is a newly-contrived CMP which polishes the nitride wafers with a liquid including potassium hydroxide, potassium peroxodisulfate and powder, irradiates the potassium peroxodisulfate with ultraviolet rays. The CMP-polished top surface has roughness RMS of 0.1 nm≦RMS≦5 nm or more favorably 0.1 nm≦RMS≦0.5 nm. The CMP-polished bottom surface has roughness RMS of 0.1 nm≦RMS≦5000 nm or more favorably 0.1 nm≦RMS≦2 nm. TTV is less than 10 μm.
    • 由氮化物和下衬底材料之间的失配导致的,由外延生长的氮化物膜在气相中的外来下衬衬底产生的氮化物半导体晶片具有很强的内部应力。 通过在气相中在GaAs下衬底上堆叠GaN膜而消除GaAs下衬层而制成的GaN晶片由于内部应力而由于GaN和GaAs之间的晶格常数的失配而向上弯曲。 通常的单面抛光具有将晶片与平面盘上的表面胶合的步骤,使另一表面与下转台接触,按压盘,旋转盘,旋转转台并磨削下表面,不能补救 固有失真。 失真会加剧外延晶片的形态,降低通孔掩模曝光的产量,并引起表面裂纹。 氮化物晶体是刚性但脆弱的。 化学/机械抛光已被要求徒劳。 当前的GaN晶圆已经粗糙化了底面,这引起了颗粒的污染和厚度的波动。制造和抛光了具有大于45mm直径的圆形氮化物晶片。 粗抛光通过抬起上转盘来补偿变形,在压力小于60g / cm 2的无压状态下抛光氮化物晶片。 中心处的失真高度H降低到H <= 12 mum。 分钟抛光是一种新设计的CMP,它们用包括氢氧化钾,过氧硫酸钾和粉末的液体对氮化物晶片进行抛光,用紫外线照射过氧二硫酸钾。 CMP抛光的顶表面的粗糙度RMS为0.1nm <= RMS <= 5nm或更优选为0.1nm <= RMS <= 0.5nm。 CMP抛光的底表面的粗糙度RMS为0.1nm <= RMS <= 5000nm或更优选为0.1nm <= RMS <= 2nm。 TTV小于10妈