Abstract: A semiconductor device according to an embodiment includes a semiconductor substrate, a cell region, and a termination region. The termination region surrounds the cell region and includes a plurality of first diffusion layers containing a first conductivity type impurity. In a cross-section of the termination region in a first direction perpendicular to the first face, at least one of the plurality of first diffusion layers includes a first region extending in the first direction from the first face toward a second face of the semiconductor substrate, and a second region extending in a second direction orthogonal to the first direction from the first region. The concentration of the first conductivity type impurity contained in the second region is lower than the concentration of the first conductivity type impurity contained in the first region.

Abstract: A semiconductor device includes a semiconductor substrate, a cell region provided, and a termination region. The termination region surrounds the cell region and includes a plurality of first diffusion layers containing a first conductive impurity, a plurality of second diffusion layers each disposed on an outer side of each of the plurality of first diffusion layers and having a concentration of the first conductive impurity lower than that of the first diffusion layers, and a plurality of conductive layers opposing the first diffusion layers and the second diffusion layers on the front face of the semiconductor substrate, the plurality of conductive layers electrically connected to the first diffusion layers, the plurality of conductive layers each having an outer end portion. On a lower side of the outer end portion, any one of the plurality of second diffusion layers is present.

Abstract: A semiconductor device includes a semiconductor part, first to fourth electrodes and a control electrode. The first and second electrodes are provided respectively on back and front surfaces of the semiconductor part. The third electrode is provided between the first and second electrodes, and provided in the semiconductor part with a first insulating film interposed. The fourth and control electrodes are provided between the second and third electrodes. The fourth and control electrodes extends into the semiconductor part from the front side and faces the third electrode with a second insulating film interposed. The fourth electrode is positioned between the semiconductor part and the control electrode. The first insulating film extends between the semiconductor part and the control electrode and between the semiconductor part and the fourth electrode. The fourth electrode faces the control electrode with a third insulating film interposed, and is electrically connected to the third electrode.

Abstract: The toner can obtain low-temperature fixing property, heat-resistant storability and long-term stability of charging while having excellent low-temperature fixing property. The toner is formed with toner particles containing a binder resin and a crystalline ester compound, the crystalline ester compound has a linear-chain structure, and the binder resin contains a styrene-acrylic resin including a structural unit derived from an acrylic ester monomer represented by general formula (1) below. In the general formula (1), R1 represents a hydrogen atom or a methyl group, and R2 represents a hydrogen atom, an alkyl group having 1 to 16 carbon atoms or an aryl group having 6 to 15 carbon atoms. m represents 2 or 3, and n represents an integer of 1 to 25.

Abstract: There is provided a toner for electrostatic-image development that can obtain low-temperature fixing property, heat-resistant storability and long-term stability of charging while having excellent low-temperature fixing property. A toner for electrostatic-image development is formed with toner particles containing a binder resin and a crystalline ester compound, the crystalline ester compound has a linear-chain structure, and the binder resin contains a styrene-acrylic resin including a structural unit derived from an acrylic ester monomer represented by general formula (1) below. Meanwhile, in the general formula (1), R1 represents a hydrogen atom or a methyl group, and R2 represents a hydrogen atom, an alkyl group having 1 to 16 carbon atoms or an aryl group having 6 to 15 carbon atoms. m represents 2 or 3, and n represents an integer of 1 to 25.