摘要:
The present invention generally provides apparatus and methods for forming LED structures. In one embodiment where a sapphire substrate is selected, the growth of bulk Group III-nitrides may be deposited in a HVPE or MOCVD chamber while a separate processing chamber, such as a PVD, MOCVD, CVD, or ALD chamber, may be used to grow buffer layers on the sapphire substrate at lower growth rate. The buffer layer may be GaN, AlN, AlGaN, InGaN, or InAlGaN. In another embodiment where a silicon-based substrate is selected, the growth of bulk Group III-nitrides may be deposited in a HVPE or MOCVD chamber in which an Al-free environment is provided while a separate processing chamber with a Ga-free environment is used to grow a Ga-free buffer layer, such as Al, AlN, or SiN, on the silicon-based substrate. The separate processing chamber may be a PVD, CVD, MOCVD, a plasma assisted MOCVD, or other vapor phase deposition techniques.
摘要:
Surface passivation techniques for chamber-split processing are described. A method includes forming a first Group III-V material layer above a substrate, the first Group III-V material layer having a top surface. A passivation layer is deposited on the top surface of the Group III-V material layer. The passivation layer is removed. Subsequently, a second Group III-V material layer is formed above the first Group III-V material layer.
摘要:
A method and apparatus for removing deposition products from internal surfaces of a processing chamber, and for preventing or slowing growth of such deposition products. A halogen containing gas is provided to the chamber to etch away deposition products. A halogen scavenging gas is provided to the chamber to remove any residual halogen. The halogen scavenging gas is generally activated by exposure to electromagnetic energy, either inside the processing chamber by thermal energy, or in a remote chamber by electric field, UV, or microwave. A deposition precursor may be added to the halogen scavenging gas to form a deposition resistant film on the internal surfaces of the chamber. Additionally, or alternately, a deposition resistant film may be formed by sputtering a deposition resistant metal onto internal components of the processing chamber in a PVD process.
摘要:
The present invention generally provides a method and apparatus for cleaning a showerhead of a deposition chamber, such as a metal organic chemical vapor deposition (MOCVD) chamber. In one embodiment, the showerhead is cleaned without exposing the chamber to the atmosphere outside of the chamber (i.e., in situ cleaning). In one embodiment, flow of liquid coolant through a cooling system that is in fluid communication with the showerhead is redirected to bypass the showerhead, and the liquid coolant is drained from the showerhead. In one embodiment, any remaining coolant is flushed from the showerhead via a pressurized gas source. In one embodiment, the showerhead is then heated to an appropriate cleaning temperature. In one embodiment, the flow of liquid coolant from the cooling system is then redirected to the showerhead and the system is adjusted for continued processing. Thus, the entire showerhead cleaning process is performed with minimal change to the flow of coolant through the cooling system.
摘要:
A radio receiver for receiving a signal is provided. The radio receiver comprises an equalizer configured to perform a constant modulus algorithm initialized using a first set of coefficients on the received signal and for generating an equalized signal. The radio receiver further comprises a demodulator coupled to the equalizer for demodulating the equalized signal. The radio receiver further comprises a lowpass filter coupled to the demodulator for lowpass filtering the demodulated signal to detect a spurious signal and to generate an offset signal. The radio receiver further comprises a coefficient generator coupled to the lowpass filter and configured to compare the offset signal to a predetermined threshold, and if the offset signal satisfies a predetermined condition in relation to the predetermined threshold, then to generate a second set of coefficients for re-initializing the constant modulus algorithm.
摘要:
Embodiments of the invention generally relate to methods for forming Group III-V materials by a hydride vapor phase epitaxy (HVPE) process. In one embodiment, a method for forming a gallium nitride material on a substrate within a processing chamber is provided which includes heating a metallic source to form a heated metallic source, wherein the heated metallic source contains gallium, aluminum, indium, alloys thereof, or combinations thereof, exposing the heated metallic source to chlorine gas while forming a metallic chloride gas, exposing the substrate to the metallic chloride gas and a nitrogen precursor gas while forming a metal nitride layer on the substrate during the HVPE process. The method further provides exposing the substrate to chlorine gas during a pretreatment process prior to forming the metal nitride layer. In one example, the exhaust conduit of the processing chamber is heated to about 200° C. or less during the pretreatment process.
摘要:
Nitride optoelectronic devices that have asymmetric double-sided structures and methods fabricating such structures are disclosed. Two n-type III-N layers are formed simultaneously over opposite sides of a substrate with substantially the same composition. Thereafter, a p-type III-N active layer is formed over one of the n-type III-N layers but not over the other.
摘要:
Highly ordered and aligned epitaxy of III-Nitride nanowires is demonstrated in this work. M-axis is identified as a preferential nanowire growth direction through a detailed study of GaN/AlN trunk/branch nanostructures by transmission electron microscopy. Crystallographic selectivity can be used to achieve spatial and orientational control of nanowire growth. Vertically aligned (Al)GaN nanowires are prepared on M-plane AlN substrates. Horizontally ordered nanowires, extending from the M-plane sidewalls of GaN hexagonal mesas or islands demonstrate new opportunities for self-aligned nanowire devices, interconnects, and networks.
摘要:
A gaseous mixture is deposited onto a substrate surface using a showerhead. A first plenum of the showerhead has a plurality of channels fluidicly coupled with an interior of a processing chamber. A second plenum gas flows through a plurality of tubes extending from a second plenum of the showerhead through the channels into the interior of the processing chamber. The diameter of the tubes is smaller than the diameter of the channels such that a first plenum gas flows into the interior of the processing chamber through a space defined between the outer surface of the tubes and the surface of the channels. The length and diameter of the tubes determine the level of distribution and the molar ratio of the first gas and the second gas in the gaseous mixture that is deposited on the surface of the substrate.
摘要:
IMS gateway systems and methods are disclosed for providing budget control in an IMS network. IMS networks allow for media changes (e.g., audio to audio/video) during an IMS session. An IMS gateway system described herein receives a session control message (e.g., SIP INVITE message) responsive to the media change during the session. The IMS gateway system identifies media information for the new media in the session control message. The IMS gateway system generates a corresponding charging request message, and includes media information for the new media in the charging request message. The IMS gateway system then transmits the charging request message to an online charging system (OCS) to provide for charging of the session based on the new media for the session.