摘要:
A light emitting device (LED) structure formed on a Group IV-based semiconductor substrate is provided. The LED structure includes a Group IV-based substrate, an AlN nucleation layer formed on the Group IV-based substrate, a GaN epitaxial layer formed on the AlN nucleation layer, a distributed Bragg reflector (DBR) multi-layer structure formed on the epitaxial layer, and an LED active layer formed on the DBR multi-layer structure.
摘要:
A method of forming laterally distributed light emitting diodes (LEDs) is disclosed. A first buffer layer with a first type of conductivity is formed on a semiconductor substrate, and a dielectric layer is formed on the first buffer layer. The dielectric layer is patterned to form a first patterned space therein, followed by forming a first active layer in the first patterned space. The dielectric layer is then patterned to form a second patterned space therein, followed by forming a second active layer in the second patterned space. Second buffer layers with a second type of conductivity are then formed on the first active layer and the second active layer. Finally, electrodes are formed on the second buffer layers and on the first buffer layer.
摘要:
An adjustable driver voltage source for a switching power supply uses a linear regulator to provide a driver voltage, and a modulator to adjust the driver voltage according to the loading change of the switching power supply. The modulator may lower the driver voltage at light load to reduce the switching loss and thereby increase the power efficiency of the switching power supply.
摘要:
A method of forming laterally distributed light emitting diodes (LEDs) is disclosed. A first buffer layer with a first type of conductivity is formed on a semiconductor substrate, and a dielectric layer is formed on the first buffer layer. The dielectric layer is patterned to form a first patterned space therein, followed by forming a first active layer in the first patterned space. The dielectric layer is then patterned to form a second patterned space therein, followed by forming a second active layer in the second patterned space. Second buffer layers with a second type of conductivity are then formed on the first active layer and the second active layer. Finally, electrodes are formed on the second buffer layers and on the first buffer layer.
摘要:
The present invention discloses an architecture of a NMOS transistor with a compressive strained Si—Ge channel fabricated on a silicon (110) substrate, which comprises: a p-silicon (110) substrate, two n+ ion-implanted regions functioning as the source and the drain respectively, a compressive strained Si—Ge channel layer, and a gate structure. The compressive strained Si—Ge channel layer is grown on the p-silicon (110) substrate to reduce the electron conductivity effective mass in the [1_l -10] crystallographic direction and to promote the electron mobility in the [1-10] crystallographic direction. Thus, the present invention can improve the electron mobility of a NMOS transistor via the channels fabricated on the silicon (110) substrate. Further, the NMOS transistor of the present invention can combine with a high-speed PMOS transistor on a silicon (110) substrate to form a high-performance CMOS transistor on the same silicon (110) substrate.
摘要:
A technique to grow high quality and large area ZnSe layer on Si substrate is provided, comprising growing GexSi1−x/Ge epitaxial layers on Si substrate by using ultra-high vacuum chemical vapor deposition (UHVCVD), and finally growing a ZnSe film on top Ge buffer layers.Two concepts are applied in the process of this invention, the first one is to block the dislocations generated from GexSi1−x epitaxial layers and to terminate the propagated upward dislocations by using strained interfaces, accordingly the dislocation density of ZnSe layer is greatly reduced and the surface roughness is improved; the second concept is to solve the problems of anti-phase domain due to growth of polar materials on non-polar material using off-cut angle Si substrate, and that is free from diffusion problems between different atoms while generally growing ZnSe layers on Si substrate.
摘要翻译:提供了在Si衬底上生长高质量和大面积ZnSe层的技术,其包括在Si衬底上生长Ge x Si x Si 1-x / Ge外延层, 高真空化学气相沉积(UHVCVD),最后在顶部Ge缓冲层上生长ZnSe膜。 在本发明的方法中应用了两个概念,第一个概念是为了阻止由Ge x 1 Si 1-x N外延层产生的位错并终止传播的向上位错 通过使用应变界面,ZnSe层的位错密度大大降低,表面粗糙度提高; 第二个概念是解决极性材料在非极性材料上使用偏角Si衬底生长的反相域问题,并且在不同原子之间没有扩散问题,而在Si衬底上通常生长ZnSe层 。
摘要:
An adjustable driver voltage source for a switching power supply uses a linear regulator to provide a driver voltage, and a modulator to adjust the driver voltage according to the loading change of the switching power supply. The modulator may lower the driver voltage at light load to reduce the switching loss and thereby increase the power efficiency of the switching power supply.
摘要:
A light emitting device (LED) structure formed on a Group IV-based semiconductor substrate is provided. The LED structure includes a Group IV-based substrate, an AlN nucleation layer formed on the Group IV-based substrate, a GaN epitaxial layer formed on the AlN nucleation layer, a distributed Bragg reflector (DBR) multi-layer structure formed on the epitaxial layer, and an LED active layer formed on the DBR multi-layer structure.
摘要:
GaN layer on semiconductor substrate is grown by using GaN nanorod buffer layer. Firstly, semiconductor substrate is cleaned and thermally degassed to remove the contaminant in the growth chamber. After the above step, the GaN nanorods layer is grown under the N-rich condition. Then, GaN epilayer is overgrown on the GaN nanorods layer under the Ga-rich condition for forming Group of III-Nitrides semiconductor layer on the semiconductor substrate.
摘要:
This invention provides a process for growing Ge epitaxial layers on Si substrate by using ultra-high vacuum chemical vapor deposition (UHVCVD), and subsequently growing a GaAs layer on Ge film of the surface of said Ge epitaxial layers by using metal organic chemical vapor deposition (MOCVD).The process comprises steps of, firstly, pre-cleaning a silicon wafer in a standard cleaning procedure, dipping it with HF solution and prebaking to remove its native oxide layer. Then, growing a high Ge-composition epitaxial layer, such as Si0.1Ge0.9 in a thickness of 0.8 μm on said Si substrate by using ultra-high vacuum chemical vapor deposition under certain conditions. Thus, many dislocations are generated and located near the interface and in the low of part of Si01.Ge0.9 due to the large mismatch between this layer and Si substrate.Furthermore, a subsequent 0.8 μm Si0.05Ge0.95 layer, and/or optionally a further 0.8 μm Si0.02Ge0.98 layer, are grown. They form strained interfaces of said layers can bend and terminate the propagated upward dislocation very effectively. Therefore, a film of pure Ge is grown on the surface of said epitaxial layers.Finally, a GaAs epitaxial layer is grown on said Ge film by using MOCVD.
摘要翻译:本发明提供了通过使用超高真空化学气相沉积(UHVCVD)在Si衬底上生长Ge外延层的方法,随后通过使用金属有机化学气相沉积在所述Ge外延层的表面的Ge膜上生长GaAs层 (MOCVD)。 该方法包括以下步骤:首先,在标准清洁程序中预清洁硅晶片,用HF溶液浸渍并预烘烤以除去其天然氧化物层。 然后,通过使用超高真空化学气相沉积法在所述Si衬底上生长厚度为0.8μm的高Ge组成外延层,例如Si 0.1 O 0.1 Ge 0.9 在某些条件下 因此,由于该层和Si衬底之间的大的失配,产生许多位错并且位于界面附近以及位于S01的一部分的低部分。 此外,随后的0.8μm的Si 0.05 Al 0.1 O 0.95层和/或任选的另外的0.8μm的Si 0.02 Co 0.98 < SUB>层,生长。 它们形成所述层的应变界面可以非常有效地弯曲和终止传播的向上错位。 因此,在所述外延层的表面上生长纯Ge的膜。 最后,通过使用MOCVD在所述Ge膜上生长GaAs外延层。