摘要:
The present invention provides a method of manufacturing a lens, in which the method includes exposing a photoresist to light using a phase shift mask. Here, the phase shift mask includes layout portions respectively corresponding to pixels and lens, in which each of the layout portions has: a light-blocking portion which has a shape of a substantially circle or a substantially concentric zone; a light-transmitting portion which has a shape of a substantially circle or a substantially concentric zone; a phase shift portion which has a shape of a substantially circle or a substantially concentric zone; and a light-blocking frame. Furthermore, the light-transmitting portion, the light-blocking portion and the phase shift portion are arranged alternately so as to form concentric circles, and the light-blocking frame corresponds to a whole or a part of a perimeter of the lens.
摘要:
A first resist film for EB exposure, a buffer film, and a second resist film for i-line exposure are applied sequentially onto a substrate. Thereafter, the second resist film and the buffer film are subjected to patterning for forming a first opening. Then, dry etching is performed with respect to the first resist film masked with the second resist film to transfer the pattern of the second resist film to the first resist film and thereby form a second opening in the first resist film. Subsequently, a third resist film of chemically amplified type is applied to the entire surface of the first resist film to form a mixing layer in conjunction with the first resist film. As a result, the wall faces of the second opening are covered with the mixing layer and the width of the second opening is thereby reduced.
摘要:
A lower resist film, which is made of PMMA for EB exposure and has a thickness of about 200 nm, is applied onto a substrate, and then an upper resist film to be exposed to i-rays is applied on the lower resist film. Thereafter, a mixed layer, in which the upper and lower resist films are mixed, is formed in the interface between the upper and lower resist films. Next, the upper resist film, except for the head-forming region thereof, is exposed to i-rays and developed, thereby forming an upper-layer opening. And then the mixed layer and a leg-forming region of the lower resist film are exposed to EB and developed, thereby forming a lower-layer opening having an upper part like a taper progressively expanding upward.
摘要:
A heterojunction FET comprises: a semi-insulation GaAs substrate; and a heterojunction structure, formed on the substrate, having: an active layer including: an undoped InGaAs layer including 10-254 of InAs composition; an undoped GaAs layer formed on the undoped InGaAs layer on the opposite side of the substrate; first and second AlGaAs layers doped with first and second dopants respectively, sandwiching the active layer, the second AlGaAs layer being provided between said active layer and the substrate; and source, gate, and drain electrodes on the heterojunction structure. A first density of the first dopant may be lower than a second density of the second dopant. The first and second dopant may be p or n type. The AlAs composition of the first AlGaAs layer may be lower than that of the second AlGaAs layer. First and second undoped AlGaAs layers sandwiched between the active layer and the first AlGaAs layer and sandwiched between the active layer and the second AlGaAs layer respectively may be provided. The second undoped AlGaAs layer is formed on the side of the substrate. The first and second undoped AlGaAs layers have first and second thicknesses respectively, the first thickness being larger than the second thickness.
摘要:
A heterojunction bipolar transistor includes a first emitter region. A second emitter region extends on the first emitter region and is connected to the first emitter region via a junction. The second emitter region has a forbidden band gap wider than a forbidden band gap of the first emitter region. At the junction, the second emitter region has a carrier energy level substantially equal to a carrier energy level of the first emitter region. An intrinsic base region extends on the second emitter region and has a forbidden band gap narrower than the forbidden band gap of the second emitter region. A collector region extends on the intrinsic base region. An extrinsic base region extends outward of the intrinsic base region and contacts the intrinsic base region and the second emitter region. The extrinsic base region separates from the first emitter region. A portion of the extrinsic base region which adjoins the second emitter region has a forbidden band gap substantially equal to the forbidden band gap of the second emitter region. A high-resistivity region extends underneath the extrinsic base region.
摘要:
A solid state imaging device includes a pixel having a photoelectric conversion element formed on a semiconductor substrate. The photoelectric conversion element includes: a first semiconductor layer of a first conductivity type; a second semiconductor layer of a second conductivity type formed on the first semiconductor layer and forming a junction therebetween; a third semiconductor layer formed on the second semiconductor layer and having a smaller band gap energy than the second semiconductor layer, the third semiconductor layer being made of a single-crystal semiconductor and containing an impurity; and a fourth semiconductor layer of the first conductivity type covering a side surface and an upper surface of the third semiconductor layer. Provision of the fourth semiconductor layer can reduce a current flowing in dark conditions.
摘要:
A solid-state imaging apparatus includes a plurality of unit pixels with associated microlenses arranged in a two-dimensional array. Each microlens includes a distributed index lens with a modulated effective refractive index distribution obtained by including a combination of a plurality of patterns having a concentric structure, the plurality of patterns being divided into line widths equal to or shorter than a wavelength of an incident light. At least one of the plurality of patterns includes a lower light-transmitting film having the concentric structure and a first line width and a first film thickness, and an upper light-transmitting film having the concentric structure configured on the lower light-transmitting film having a second line width and a second film thickness. The distributed index lens has a structure in which a refractive index material is dense at a center and becomes sparse gradually toward an outer side in the concentric structure.
摘要:
An insulating-gate semiconductor device has a first nitride semiconductor layer formed over a substrate and an insulating oxidation layer obtained by oxidizing a second nitride semiconductor layer formed on the first nitride semiconductor layer. A gate electrode is formed on the insulating oxidation layer.
摘要:
The present invention provides a solid-state imaging apparatus and the like which is able to support an optical system whose incident angle is wide. Each pixel is 2.25 μm square in size, and includes a distributed index lens 1, a color filter (for example, for green) 2, an Al interconnections 3, a signal transmitting unit 4, a planarized layer 5, a light-receiving device (Si photodiodes) 6, and an Si substrate 7. The two-stage concentric circle structure of the distributed index lens is formed by SiO2 (n=2) with the film thickness 1.2 μm (“grey color”), the film thickness 0.8 μm (“dots pattern”) and the film thickness of 0 μm (“without pattern: white color”), and the medium surrounding the distributed index lens 1 is air (n=1).
摘要:
An n-type first single crystal silicon layer is provided as collector region over a silicon substrate with a first insulating film interposed therebetween. A p-type first polysilicon layer is provided as an extension of a base region over the first single crystal silicon layer with a second insulating film interposed therebetween. A p-type second single crystal silicon layer is provided as intrinsic base region on a side of the first single crystal silicon layer, second insulating film and first polysilicon layer. An n-type third single crystal silicon layer is provided as emitter region on a side of the second single crystal silicon layer. And an n-type third polysilicon layer is provided on the first insulating film as extension of an emitter region and is connected to a side of the third single crystal silicon layer.