Abstract:
The invention relates to an ohmic contact structure comprising a metallisation layer (14) which is arranged on a semiconductor material (10). A contact layer is formed in the semiconductor material (10, said contact layer comprising a first partial region which is adjacent to the metallisation layer (14) and a second partial region (18) following the first partial region. The contact layer is doped in such a way that the doping concentration (N 2 ) in the first partial region (12) is higher than the doping concentration (N 1 ) in the second partial region (18).
Abstract:
The invention relates to a light-emitting diode chip (1), comprising a series of epitaxial layers (3) arranged on a substrate (2), which are equipped with an InGaN-based active structure (4) that emits radiation. A buffer layer (20) is provided between the substrate (2) and the active structure (4). The material or materials of the buffer layer (20) are selected in such a way that their epitaxial surface (6) is untensioned or slightly tensioned for the epitaxy of the active structure (4) at the epitaxial temperature(s). The active structure (4) has zones (5) rich in In that are arranged laterally adjacent to one another in relation to the epitaxial plane. The In content in said zones is greater than in the other zones of the active structure (4). The invention also relates to a preferred method for producing the chips.
Abstract:
The optoelectronic semiconductor chip has a growth substrate (1) with a structured growth surface, which has multiple projections (4) and hollows (3). An active series of deposits (5) are applied on the growth surface. The surface area of the active series of deposits is larger than the area of the lateral cross section (Q) of the growth substrate. The growth substrate consists of gallium nitride, silicon carbide, sapphire, indium gallium nitride, indium aluminum gallium nitride nad zinc oxide.
Abstract:
Optoelectronic semiconductor chip comprises an active layer (4) between delimiting layers (2, 3, 5, 6) for optical and/or electrical confinement in the material system of ZnSe or GaN. A superlattice made from a periodic sequence of thin layers of at least three mixed crystal compositions is formed in at least one of the layers.
Abstract:
The invention relates to a method for heat treating a surface layer (4) on a semiconductor substrate (5). Laser pulses (2), generated by a laser (1), are delivered to the surface layer (4). Said method permits, in particular, ohmic contacts to III-V compound semiconductors to be produced.
Abstract:
The method involves making a substrate with an epitaxial functional semiconductor layer sequence (2). The substrate (1) has a separation zone (4) provided by ion implantation, where the ion implantation follows epitaxial growth into the substrate (1) and takes place via the functional semiconductor layer sequence (2). A carrier substrate (6) is applied on the functional semiconductor layer sequence (2). The separation zone (4) is separated from the carrier substrate (6). The substrate (1) and the functional semiconductor layer sequence (2) have the same grating space.
Abstract:
Production of a radiation-emitting semiconductor component comprises preparing a substrate (10), applying a first reflector layer (12) on the substrate, applying a semiconductor layer sequence (14) based on GaN and consisting of an active layer (20), a lower casing layer (16) and an upper casing layer (18) on the reflector layer, and applying a second reflector layer (30) on the upper casing layer. A structure is formed in the lateral direction of the component in contact with the upper casing layer of the layer sequence. The structure has regions with a contact layer made from a metal having good electrical properties. An Independent claim is also included for a radiation-emitting semiconductor component produced by the above process.
Abstract:
The invention relates to an ohmic contact structure comprising a metallisation layer (14) which is arranged on a semiconductor material (10). A contact layer is formed in the semiconductor material (10, said contact layer comprising a first partial region which is adjacent to the metallisation layer (14) and a second partial region (18) following the first partial region. The contact layer is doped in such a way that the doping concentration (N2) in the first partial region (12) is higher than the doping concentration (N1) in the second partial region (18).