Abstract:
A hybrid deposition system (30) includes a reactor chamber (32), at least one heating unit (40, 42, 44), a first reagent gas source (46), a metallo-organic source (52), a second reagent gas source (48), and a valve unit (54b) for stopping gas flow from the metallo-organic source (52). The hybrid system (30) incorporates features of both metal-organic chemical vapor deposition (MOCVD) and hydride vapor-phase epitaxy (HVPE). The hybrid system (30) may operate in MOCVD mode, HVPE mode, or both modes simultaneously. The hybrid system (30) may switch between deposition modes without interrupting deposition, or removing the sample from the reactor chamber (32). The heating unit (40, 42, 44) may move relative to the reactor chamber (32), or vice versa, to adjust the temperature of the reactor chamber (32). A hybrid deposition method uses two different depositiontechniques in the same reactor chamber (32) to form an epitaxial layer of a III-V compound on a non-native substrate. The two different deposition techniques, e.g., MOCVD and HVPE, may be performed in the same reactor chamber, consecutively and concurrently.
Abstract in simplified Chinese:一种混合型沉积系统(30)包括反应器(32)、至少一个加热单元(40、42、44)、第一个物剂气体来源(46)、有机金属物来源(52)、第二种物剂气体来源(48)和用以中止来自有机金属物来源(52)气流的阀单元(54b)。此混合型系统(30)兼具有机金属化学蒸镀法(MOCVD)和氢化物蒸汽相磊晶法(HVPE)的特征。此混合型系统(30)可以MOCVD模式、HVPE模式或这两种模式同时操作。此混合型系统(30)可切换于沉积模式之间且不会中断沉积,也不须自反应器移出样品。加热单元(40、42、44)可以相对于反应器(32)地移动,反之亦然,以简便和迅速地调整反应器(32)温度。混合型沉积法在相同反应器(32)使用两种不同的沉积技巧,在非原生底质上形成至少一个Ⅲ-Ⅴ氮化物的磊晶层。可于相同反应器中连续或同时实施两种不同的沉积技巧(如:MOCVD和HVPE)。
Abstract:
Hydride vapor-phase deposition (HVPE) systems are disclosed. An HVPE hydride vapor-phase deposition system may include a reactant source chamber and a growth chamber containing a susceptor coupled to the reactant source chamber. The reactant source chamber may be configured to create a reactant gas through a chemical reaction between a solid or liquid precursor and a different precursor gas. The reactant source chamber can be configured to operate at a temperature T(M) significantly above room temperature. The reactant gas can be chemically unstable at or near room temperature. The susceptor is configured to receive a substrate and maintain the substrate at a substrate temperature T(S). The growth chamber includes walls can be configured to operate at a temperature T(C) such that T(M), T(S) are greater than T(C).
Abstract:
A method for forming an epitaxial layer (4) involves depositing a buffer layer (2) on a substrate (1) by a first deposition process, followed by deposition of an epitaxial layer (4) by a second deposition process. By using such a dual process, the first and second deposition processes can be optimized, with respect to performance, growth rate, and cost, for different materials of each layer. A semiconductor heterostructure prepared by a dual deposition process includes a buffer layer (2) formed on a substrate by MOCVD, and an epitaxial layer (4) formed on the buffer layer (2), the eptitaxial layer deposited by hydride vapor-phase deposition.
Abstract in simplified Chinese:在此揭露一种制造无裂痕周期表第III族氮化物层体之方法。该方法借由在一初始基底上成长一无裂痕之周期表第III族氮化物之第一层体来进行。接着,使第一层体之晶格与初始基底之晶格之间部分地至完全地丧失结合性。然后成长一第二层体,以构成一复合层体,而不使第一层体与初始基底分离,其中该复合层体包括第一层体及第二层体,且该第一层体系介于第二层体与初始基底之间。接着,初始基底可以与复合层体完全分离,以制造出独立无裂痕之周期表第III族氮化物层体。
Abstract:
A method for the production of crack-free Group III-Nitride layers is disclosed. The method proceeds by growing a crack-free first layer (502) of Group III-Nitride on a starting substrate (501). A partial to complete loss of coherency (504) is then achieved between a lattice of the first layer and a lattice of the starting substrate. A second layer (506) is grown to form a composite layer (507) that includes the first layer (502) and the second layer (506) such that the first layer is between the second layer (506) and the substrate (501). The starting substrate (501) may then be completely separated from the composite layer to produce the freestanding crack-free Group III-Nitride layer.
Abstract:
A vapor-phase deposition system includes one or more channel units for promoting the downstream passage of reagent gases. A reactor (21) of a vapor-phase deposition system may include one or more channels (25) to promote passage of reagent gases (5) beneath a susceptor stage (33). A susceptor, for arrangement within a reactor during epitaxial growth on a substrate, may include a truncated side (35). The substrate may be aligned with a lower edge of the truncated side, thereby, avoiding chemical deposition on surfaces upstream of the substrate. One or more channels of the susceptor promote the downstream passage of reagent gases within the reactor. Methods for vapor-phase deposition and for promoting downstream passage of reagent gases within a reactor are also disclosed.
Abstract:
Hydride vapor-phase deposition (HVPE) systems are disclosed. An HVPE hydride vapor-phase deposition system may include a reactant source chamber and a growth chamber containing a susceptor coupled to the reactant source chamber. The reactant source chamber may be configured to create a reactant gas through a chemical reaction between a solid or liquid precursor and a different precursor gas. The reactant source chamber can be configured to operate at a temperature T(M) significantly above room temperature. The reactant gas can be chemically unstable at or near room temperature. The susceptor is configured to receive a substrate and maintain the substrate at a substrate temperature T(S). The growth chamber includes walls can be configured to operate at a temperature T(C) such that T(M), T(S) are greater than T(C).