摘要:
A piezoelectric element includes an upper electrode, a lower electrode, and a piezoelectric body disposed between the upper electrode and the lower electrode. The piezoelectic body contains lead zirconate titanate. The piezoelectric element also includes a seed layer containing lead disposed between the lower electrode and the piezoelectric body. The seed layer has an amorphous structure at least over an entire surface layer portion on the piezoelectric body side.
摘要:
A method for producing a group 13 nitride single crystal includes dissolving and crystal growing. The dissolving includes dissolving nitrogen in a mixed melt in a reaction vessel that contains the mixed melt, a seed crystal, and a surrounding member. The mixed melt contains an alkali metal and a group 13 metal. The seed crystal is a seed crystal that is placed in the mixed melt and includes a group 13 nitride crystal in which a principal face is a c-plane. The surrounding member is arranged so as to surround the entire area of a side face of the seed crystal. The crystal growing includes growing a group 13 nitride crystal on the seed crystal.
摘要:
A gallium nitride crystal having a hexagonal crystal structure includes a first region located on an inner side of a cross section intersecting c-axis of the hexagonal crystal structure, and a second region surrounding at least a part of the outer periphery of the first region in the cross section. An emission spectrum of each of the first region and the second region with electron beam or ultraviolet light excitation has a first peak including a band edge emission of gallium nitride and a second peak located in a longer wavelength area than the first peak. A peak intensity of the first peak is smaller than a peak intensity of the second peak in the first region, and a peak intensity of the first peak is greater than a peak intensity of the second peak in the second region.
摘要:
A method for producing a crystal substrate includes preparing, measuring, holding, and machining. The preparing prepares a crystal substrate body including a curved crystal lattice plane. The measuring measures a shape feature of the crystal lattice plane. The holding holds the crystal substrate body in a warped state in accordance with the shape feature measured by the measuring, to more flatten the crystal lattice plane than the crystal lattice plane at the preparing. The machining machines a surface of the crystal substrate body held in the warped state, to flatten the surface.
摘要:
A gallium nitride crystal having a hexagonal crystal structure, wherein a full width at half maximum (FWHM) of X-ray rocking curve in a region at a side of one edge in a c-axis direction is smaller than the FWHM in a region at a side of the other edge in the c-axis direction, in at least one of m-plane outer peripheral surfaces of the hexagonal crystal structure.
摘要:
A method for producing a gallium nitride crystal includes growing a gallium nitride crystal 5 by dissolving nitrogen in a mixed melt including gallium and sodium, and collecting the gallium 55 separated from an alloy 51 including the gallium and the sodium by reacting the alloy 51 and a liquid 52 that ionizes the sodium and separating sodium ions and the gallium 55 from the alloy.
摘要:
A gallium nitride crystal having a hexagonal crystal structure includes a first region located on an inner side of a cross section intersecting c-axis of the hexagonal crystal structure, and a second region surrounding at least a part of the outer periphery of the first region in the cross section. An emission spectrum of each of the first region and the second region with electron beam or ultraviolet light excitation has a first peak including a band edge emission of gallium nitride and a second peak located in a longer wavelength area than the first peak. A peak intensity of the first peak is smaller than a peak intensity of the second peak in the first region, and a peak intensity of the first peak is greater than a peak intensity of the second peak in the second region.
摘要:
A manufacturing method for manufacturing a surface-emitting laser device includes the steps of forming a laminated body in which a lower reflecting mirror, a resonator structure including an active layer, and an upper reflecting layer having a selective oxidized layer are laminated on a substrate; etching the laminated body to form a mesa structure having the selective oxidized layer exposed at side surfaces thereof; selectively oxidizing the selective oxidized layer from the side surfaces of the mesa structure to form a constriction structure in which a current passing region is surrounded by an oxide; forming a separating groove at a position away from the mesa structure; passivating an outermost front surface of at least a part of the laminated body exposed when the separating groove is formed; and coating a passivated part with a dielectric body.
摘要:
A printing control apparatus includes a print commanding unit that sends a notice of printing data and printing start command to a printing unit on sheets supplied from a normal tray or a bypass tray. The print commanding unit includes a condition determining unit that determines whether a sheet supplying condition set with respect to the printing data and a status of the printing unit satisfy a condition for the bypass tray; a checkup screen display unit that displays a checkup screen relating to the sheet supply from the bypass tray in a case where it is determined that the condition is satisfied; and a notice permitting unit that permits a notice of a printing start command in a case where a notice indicating agreement for printing is received.
摘要:
A semiconductor device including: a semiconductor layer; a gate insulating layer; a gate electrode; a channel region; a source region and a drain region; a guard ring region; an offset insulating layer; a first interlayer dielectric; a first shield layer formed above the first interlayer dielectric and the guard ring region and electrically connected to the guard ring region; a second interlayer dielectric; and a second shield layer formed above the second interlayer dielectric, wherein the first shield layer is provided outside of both ends of the gate electrode in a channel width direction when viewed from the top side; and wherein the second shield layer is provided in at least part of a first region and/or at least part of a second region, the first region being a region between one edge of the gate electrode and an edge of the first shield layer opposite to the edge of the gate electrode in the channel width direction when viewed from the top side, and the second region being a region between the other edge of the gate electrode and an edge of the first shield layer opposite to the other edge of the gate electrode in the channel width direction when viewed from the top side.