Abstract:
A method of fabricating an electromechanical transducer film includes applying a precursor solution on a support substrate, heating the substrate at a first temperature to form a ceramic thin-film in amorphous state, applying a sol-gel solution onto the ceramic thin-film, and heating the ceramic thin-film at a second temperature to form an electromechanical transducer thin-film in amorphous state. The method further includes heating the ceramic and transducer thin-films at a third temperature to thermally decompose an organic substance in the sol-gel solution and form a unitary thin-film, processing the unitary thin-film to form a patterned unitary thin-film, modifying an area on which the patterned film is not formed, discharging the sol-gel solution onto a surface of the patterned film by a liquid discharge head to apply the sol-gel solution to the surface of the patterned film, and heating the patterned film at a fourth temperature to crystallize the patterned film.
Abstract:
An electromechanical transducer element includes a first electrode; an electromechanical transducer film stacked on one surface of the first electrode; a second electrode stacked on the electromechanical transducer film; and wiring formed on the second electrode. In an at least one cross section, each of a boundary, on a second electrode side, of the electromechanical transducer film and a boundary, on a side opposite to the electromechanical transducer film, of the second electrode is a curved shape protruding away from the first electrode. In the at least one cross section, each of a film thickness of the electromechanical transducer film and a film thickness of the second electrode becomes thinner toward end portions from a maximum height portion.
Abstract:
An applying liquid is applied to a first electrode by ejecting from a nozzle the applying liquid including a raw material for forming an elecromechanical transducer film, and a film of the applying liquid applied onto the first electrode is dried. The dried film is thermally decomposed and crystallized. At this time, a voltage is applied to an accompanying droplet collecting electrode for collecting a small accompanying droplet accompanying a chief droplet. The accompanying droplet is electrostatically attracted and collected by the accompanying droplet collecting electrode before reaching the first electrode. At this time, the voltage is applied to the accompanying droplet collecting electrode by the voltage applying part after a predetermined period of time has elapsed from when a droplet of the applying liquid has been ejected from the nozzle.
Abstract:
There is provided a method of producing an electromechanical transducer that includes a plurality of electromechanical transducer elements on a substrate. The method includes forming a plurality of individual electrodes corresponding to the plurality of electromechanical transducer elements on the substrate, forming an insulation film to cover the plurality of individual electrodes on the substrate, forming a conductive film on the insulation film, forming a plurality of openings to expose the plurality of individual electrodes in each of the insulation film and the conductive film, and forming a plurality of electromechanical transducer films on the plurality of individual electrodes exposed in the plurality of openings.
Abstract:
A gate driver turns on/off a switching element Q1 by applying a control signal from a controller to a gate of the switching element. The switching element has the gate, a drain, and a source and contains a wide-bandgap semiconductor. The gate driver includes a parallel circuit that includes a first capacitor C1 and a first resistor R1 and is connected between the controller and the gate of the switching element and a short-circuit unit S4 that is connected between the gate and source of the switching element and short-circuits the gate and source of the switching element after a delay from an OFF pulse of the control signal.
Abstract:
Disclosed is a method of producing a piezoelectric actuator including a first electrode film forming process; a monomolecular film forming process; a pattering process of removing a monomolecular film having a rectangular shape; an application process of applying a precursor solution to the first electrode film exposed in the rectangular shape; a piezoelectric film forming process of converting the applied precursor solution into a piezoelectric film; and a second electrode film forming process. Materials of the precursor solution, the first electrode film, and the monomolecular film are adjusted so that the first electrode film is lyophilic and the monomolecular film is lyophobic to the precursor solution. The piezoelectric film forming process includes a drying and thermally decomposing process of drying and thermally decomposing the precursor solution; and a crystallizing process of crystallizing a thermally decomposed piezoelectric material.
Abstract:
To provide a semiconductor device in which a rectifying element capable of reducing a leak current in reverse bias when a high voltage is applied and reducing a forward voltage drop Vf and a transistor element are integrally formed on a single substrate.A semiconductor device has a transistor element and a rectifying element on a single substrate. The transistor element has an active layer formed on the substrate and three electrodes (source electrode, drain electrode, and gate electrode) disposed on the active layer. The rectifying element has an anode electrode disposed on the active layer, a cathode electrode which is the drain electrode, and a first auxiliary electrode between the anode electrode and cathode electrode.
Abstract:
An electronic device includes a substrate; and a plurality of thin-film elements formed on the substrate. Further, the thin-film element includes a thin-film section having a function selected from a group including piezoelectric effect, inverse piezoelectric effect, charge storage, semiconductivity, and conductivity, and the plurality of thin-film elements includes the thin-film sections having two or more different functions.
Abstract:
A precursor sol-gel solution is provided that has been subjected to a partial hydrolysis process and is used for forming an oxide dielectric film having a perovskite structure represented by the general formula ABO3. The precursor sol-gel solution is subjected to a stabilization process for controlling a viscosity change resulting from the partial hydrolysis process to be less than or equal to 50%, and water contained in the precursor sol-gel solution is controlled to be greater than or equal to 0.50 times and less than or equal to 10 times by molar ratio with respect to a B site atom contained in the precursor sol-gel solution.
Abstract:
Disclosed is an electromechanical transducer film forming method including a surface modification process; an application process; and processes of drying, thermally decomposing, and crystallizing sol-gel solution applied to a portion of a surface of a first electrode. An electromechanical transducer film is formed on a desired pattern area on the surface of the first electrode by repeating the above processes. In the application process, each of dots of the sol-gel solution applied by the inkjet method drops onto both a first area inside the desired pattern area and a second area outside the desired pattern area. The first area is a hydrophilic area on the surface of the first electrode, and the second area is a hydrophobic area on the surface of the first electrode. The hydrophilic area and the hydrophobic area have been modified by the surface modification process.