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Provided is a rectifier such as a detector in which a cutoff frequency may be increased in a view point different from the reduction in size of the structure. The rectifier includes: a Schottky barrier portion including a Schottky electrode; a barrier portion having a rectifying property with respec

Provided is a rectifier such as a detector in which a cutoff frequency may be increased in a view point different from the reduction in size of the structure. The rectifier includes: a Schottky barrier portion including a Schottky electrode; a barrier portion having a rectifying property with respect to a majority carrier in the Schottky barrier portion; and an ohmic electrode in electrical contact with the barrier portion having the rectifying property, in which each of the Schottky barrier portion and the barrier portion having the rectifying property has an asymmetrical band profile whose gradient on one side is larger than a gradient of another side, and the Schottky barrier portion and the barrier portion having the rectifying property are connected to each other so that the steep gradient side of the band profile is located on a side of the Schottky electrode.

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1. A detector, comprising: a Schottky barrier portion including a Schottky electrode;a barrier portion having a rectifying property with respect to a majority carrier in the Schottky barrier portion; andan ohmic electrode which is in electrical contact with the barrier portion having the rectifying

1. A detector, comprising: a Schottky barrier portion including a Schottky electrode;a barrier portion having a rectifying property with respect to a majority carrier in the Schottky barrier portion; andan ohmic electrode which is in electrical contact with the barrier portion having the rectifying property, wherein:each of the Schottky barrier portion and the barrier portion having the rectifying property has an asymmetrical band profile whose gradient on one side is larger than a gradient of another side; andthe Schottky barrier portion and the barrier portion having the rectifying property are connected to each other via only a conductive portion providing the majority carrier so that the one side being the large gradient of the band profile is located on a side of the Schottky electrode. 2. The detector according to claim 1, wherein the Schottky barrier portion is connected to the barrier portion having the rectifying property so that the same majority carriers pass through the barrier portion having the rectifying property and the Schottky barrier portion when an electric field component of an electromagnetic wave to be detected is induced between the Schottky electrode and the ohmic electrode. 3. The detector according to claim 2, further comprising a plurality of the barrier portions having the rectifying property, wherein the plurality of barrier portions having the rectifying property are connected. 4. The detector according to claim 2, wherein the Schottky barrier portion comprises, in order from the Schottky electrode, one of a metal and a semi-metal forming the Schottky electrode and one of an intrinsic semiconductor and a substantially intrinsic semiconductor which are capable of depleting the majority carrier. 5. The detector according to claim 2, wherein the majority carrier comprises an electron. 6. The detector according to claim 2, further comprising a transistor for generating a detecting signal, wherein the detector and the transistor are provided on the same substrate. 7. The detector according to claim 2, further comprising an antenna for inducing, between the Schottky electrode and the ohmic electrode, an electric field component of the electromagnetic wave to be detected, wherein the Schottky electrode and the ohmic electrode are provided as output ports of the antenna. 8. An image forming device, comprising: a plurality of detectors according to claim 1, wherein:the plurality of detectors are arranged in array; andthe plurality of detectors detect electric fields of electromagnetic waves, based on which an electric field distribution image is formed. 9. A detector, comprising: a Schottky barrier portion including a Schottky electrode;a barrier portion having a rectifying property with respect to a majority carrier in the Schottky barrier portion; andan ohmic electrode which is in electrical contact with the barrier portion having the rectifying property,wherein each of the Schottky barrier portion and the barrier portion having the rectifying property has an asymmetrical band profile whose gradient on one side is larger than a gradient of another side,wherein the Schottky barrier portion and the barrier portion having the rectifying property are connected to each other via a conductive portion providing the majority carrier so that the one side being the large gradient of the band profile is located on a side of the Schottky electrode,wherein the Schottky barrier portion is connected to the barrier portion having the rectifying property so that the same majority carriers pass through the barrier portion having the rectifying property and the Schottky barrier portion when an electric field component of an electromagnetic wave to be detected is induced between the Schottky electrode and the ohmic electrode,wherein the Schottky barrier portion comprises, in order from the Schottky electrode, one of a metal and a semi-metal forming the Schottky electrode and one of an intrinsic semiconductor and a substantially intrinsic semiconductor which are capable of depleting the majority carrier, andwherein the barrier portion having the rectifying property includes a multilayer film structure in which a semiconductor having a conductivity type for providing the majority carrier, one of an intrinsic semiconductor and a substantially intrinsic semiconductor which are capable of depleting the majority carrier, a semiconductor opposite in conductivity to the semiconductor having the conductivity type, one of another intrinsic semiconductor and another substantially intrinsic semiconductor which are capable of depleting the majority carrier and thicker than the one of the intrinsic semiconductor and the substantially intrinsic semiconductor, and another semiconductor having the conductivity type for providing the majority carrier, are provided in order from the Schottky electrode. 10. A detector, comprising: a Schottky barrier portion including a Schottky electrode;a barrier portion having a rectifying property with respect to a majority carrier in the Schottky barrier portion; andan ohmic electrode which is in electrical contact with the barrier portion having the rectifying property,wherein each of the Schottky barrier portion and the barrier portion having the rectifying property has an asymmetrical band profile whose gradient on one side is larger than a gradient of another side,wherein the Schottky barrier portion and the barrier portion having the rectifying property are connected to each other via a conductive portion providing the majority carrier so that the one side being the large gradient of the band profile is located on a side of the Schottky electrode,wherein the Schottky barrier portion is connected to the barrier portion having the rectifying property so that the same majority carriers pass through the barrier portion having the rectifying property and the Schottky barrier portion when an electric field component of an electromagnetic wave to be detected is induced between the Schottky electrode and the ohmic electrode,wherein the Schottky barrier portion comprises, in order from the Schottky electrode, one of a metal and a semi-metal forming the Schottky electrode and one of an intrinsic semiconductor and a substantially intrinsic semiconductor which are capable of depleting the majority carrier, andwherein the barrier portion having the rectifying property includes a multilayer film structure in which a semiconductor having a conductivity type for providing the majority carrier, a semi-metal, one of an intrinsic semiconductor and a substantially intrinsic semiconductor which are capable of depleting the majority carrier, and another semiconductor having the conductivity type for providing the majority carrier, are provided in order from the Schottky electrode. 11. A detector, comprising: a Schottky barrier portion including a Schottky electrode;a barrier portion having a rectifying property with respect to a majority carrier in the Schottky barrier portion; andan ohmic electrode which is in electrical contact with the barrier portion having the rectifying property,wherein each of the Schottky barrier portion and the barrier portion having the rectifying property has an asymmetrical band profile whose gradient on one side is larger than a gradient of another side,wherein the Schottky barrier portion and the barrier portion having the rectifying property are connected to each other via a conductive portion providing the majority carrier so that the one side being the large gradient of the band profile is located on a side of the Schottky electrode,wherein the Schottky barrier portion is connected to the barrier portion having the rectifying property so that the same majority carriers pass through the barrier portion having the rectifying property and the Schottky barrier portion when an electric field component of an electromagnetic wave to be detected is induced between the Schottky electrode and the ohmic electrode,wherein the Schottky barrier portion comprises, in order from the Schottky electrode, one of a metal and a semi-metal forming the Schottky electrode and one of an intrinsic semiconductor and a substantially intrinsic semiconductor which are capable of depleting the majority carrier, andwherein the barrier portion having the rectifying property includes a multilayer film structure in which a semiconductor having a conductivity type for providing the majority carrier, one of an intrinsic semiconductor and a substantially intrinsic semiconductor which have a larger band gap than the semiconductor having the conductivity type and are capable of depleting the majority carrier, and another semiconductor having the conductivity type for providing the majority carrier, are provided in order from the Schottky electrode.