Abstract:
PROBLEM TO BE SOLVED: To suppress the leakage current of a Schottky junction. SOLUTION: This invention discloses the field effect transistor comprising a nitride semiconductor layer including a channel layer, a Schottky electrode 20 including a GZO layer 22 provided in contact with the nitride semiconductor layer and heat-treated under an inert gas atmosphere and ohmic electrodes 16 and 18 connected to the channel layer, and its manufacturing method. By this invention, by forming the Schottky junction of the nitride semiconductor layer and the GZO layer 22, the leakage current of the reverse current of the Schottky junction is suppressed and the ideal coefficient of a forward current is brought close to 1. COPYRIGHT: (C)2009,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To improve light emission efficiency in a semiconductor light-emitting apparatus. SOLUTION: A semiconductor light-emitting apparatus comprises a substrate and a quantum well active layer which comprises a plurality of barrier layers 32 composed of a GaN-based semiconductor and a well layer 30 sandwiched between the barrier layers 32 and composed of the GaN-based semiconductor and which has a polarization charge formed by piezo polarization between the barrier layer 32 and the well layer 30. In the semiconductor light-emitting apparatus, the well layer 30 is formed by modulating the composition so that a handicap becomes minimum at an interface with the barrier layer 32 on a side farther from the substrate 10. COPYRIGHT: (C)2009,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To provide a light-receiving element capable of reducing a dark current, and to provide a manufacturing method thereof. SOLUTION: The light-receiving element (100) is provided with a semiconductor substrate (1); first conductivity-type first semiconductor layers (2, 3, 4, 5 and 6) provided on the semiconductor substrate; a second conductivity-type second semiconductor layer (7) provided on the first semiconductor layers; and a third semiconductor layer (13) provided on the side surfaces of the first semiconductor layers and the second semiconductor layer and equipped with a thin layer region having a thin layer thickness on one part. The thinnest portion of a thin layer region (13a) is positioned on the semiconductor substrate side than a built-in depletion layer (A) on an interface between the first semiconductor layers and the second semiconductor layer. COPYRIGHT: (C)2009,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To suppress a side-gate effect, by setting a p-type semiconductor layer under an element separation region as the electric potential of an FET source electrode. SOLUTION: The semiconductor device has the p-type semiconductor layer 12 formed on a substrate 10 and comprising a compound semiconductor; a compound semiconductor layer 21 formed on the p-type semiconductor layer 12; a plurality of active regions 27, formed on the compound semiconductor layer 21 and lying adjacent via an element isolation region 28; a connection part 32, connected to the p-type semiconductor layer 12 in the region between the active regions 27, or in the element isolation region 28 adjacent to the region between the active regions 27; and a plurality of FETs 40, 42 respectively formed in the adjacent active regions 27, with the source electrode 22 of at least one FET 42 from among a plurality of FETs connected to the electric potential of the connection part 32, in a region other than the active regions 27. COPYRIGHT: (C)2008,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To provide a semiconductor substrate and a semiconductor device including a GaN layer having a good crystal property and assuring a small warpage. SOLUTION: The semiconductor substrate and semiconductor device include an AIN layer 12 provided on a Si substrate 10, an AlGaN layer 14 provided on the AIN layer 12 to have a composition ratio of Al of 0.3 or more and 0.6 or less, and a GaN layer 16 provided on an AlGaN layer 14. According to the semiconductor substrate and semiconductor device, wafer warpage can be reduced by setting the Al composition ratio of the AlGaN layer 14 to 0.6 or less and GaN layer crystal property can be improved by setting the composition ratio to 0.3 or more. COPYRIGHT: (C)2008,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To improve characteristics in a semiconductor device by reducing edge dislocation in the GaN layer of a semiconductor substrate. SOLUTION: The semiconductor substrate has: an AlN layer 12 provided on a substrate 10; an Si-doped GaN layer 14 provided on the AlN layer 12; and an undoped GaN layer 16 provided on the Si-doped GaN layer 14. By the semiconductor substrate, the semiconductor device, and a method for manufacturing the semiconductor device, edge dislocation in the GaN layer is reduced, thus improving characteristics in the semiconductor device. COPYRIGHT: (C)2008,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To suppress leakage current at a Schottky junction. SOLUTION: The present invention relates to a semiconductor device and a method of manufacturing the semiconductor device, in which the semiconductor device is provided with: a nitride semiconductor layer including a channel layer; a Schottky electrode, containing indium 20, provided in contact with the nitride semiconductor layer; and ohmic electrodes 16, 18 provided in connection with the channel layer. According to the present invention, by forming a Schottky junction of a nitride semiconductor layer and a layer containing indium makes it possible to suppress the reverse leakage current in a Schottky junction and bring the ideal factor of forward current close to 1. COPYRIGHT: (C)2008,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To provide a semiconductor light-emitting device which is excellent in a light-emitting efficiency and mass productivity and uses a transparent insulating substrate whose flip chip bonding can be easily made, and to provide its manufacturing method. SOLUTION: The semiconductor light-emitting device is constructed in a manner such that a first semiconductor layer (14) , an active layer (16), and a second semiconductor layer (18) which is an opposite conductive type to the first semiconductor layer are located on the surface of the transparent insulating substrate (12) having a first cutout portion (20) communicating from the surface side to the back side on the side, and an n-side contact electrode (22) located on the first semiconductor layer and a first electrode (32) located on the back of the transparent insulating substrate are electrically connected through a first connection portion (30) positioned on the first cutout portion, thereby, the first semiconductor layer and the first electrode are electrically connected, and a p-side contact electrode (34) electrically connected with the second semiconductor layer and a second electrode (36) are located on the second semiconductor layer. COPYRIGHT: (C)2008,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To suppress leakage current of a GaN-based FET using the MIS structure. SOLUTION: The GaN-based FET using the MIS structure comprises a GaN electron traveling layer (12) provided on a substrate (10), an AlGaN electron supplying layer (14) provided on the electron traveling layer (12) and generating a two-dimensional electron gas (13) on the electron traveling layer (12), an insulating film (22) provided on the electron supplying layer (14), and a gate electrode (34) provided on the insulating film (22). The film thickness of the insulating film (22) under the center of the gate electrode (34) of the semiconductor device is thinner than that of an insulating film (24) under the end part (35) of the gate electrode (34). COPYRIGHT: (C)2008,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To suppress warping, breaking, cracking, or the like of a substrate which is caused by a difference in thermal expansion factors between the substrate and a metal mask. SOLUTION: The manufacturing method of a semiconductor device includes a process for forming a metal mask comprising a first trimming pattern (30) for opening a wanted region and a second trimming pattern (32) for opening such region as separates the material of metal mask into a plurality of sections that are not connected each other, and a process for selectively removing at least either a substrate or a layer provided on the substrate by dry-etching using the metal mask. COPYRIGHT: (C)2008,JPO&INPIT