Semiconductor diode device
First Claim
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1. A semiconductor diode comprising;
- a first contact zone;
an active layer;
a second contact zone;
the first contact zone being doped with the opposite dopant type than that of the active layer;
the second contact zone being doped with the same dopant type as the active layer;
the first contact zone, the active layer and the second contact zone being arranged in a stack such that the active layer is located between the first contact zone and the second contact zone;
wherein the semiconductor diode structure further comprises an additional layer which is doped with the same dopant type as the active layer and which has a wider bandgap than the active layer and, wherein the additional layer is located between the active layer and the first contact zone and wherein the additional layer has a band gap lower than that of the second contact zone.
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Abstract
A multi-layer semiconductor diode having a layer of wide bandgap material located between the active layer and a first contact zone, where the active layer and additional wide bandgap layer are of one dopant type, and the first contact zone is of the opposite dopant type. A specific embodiment of the invention comprises a stack formed from a first contact zone (4) of p-type material, a lightly doped p-type active layer (2), an additional p layer (20) and a second contact zone (6) of n-type material. The diode may be used as an infrared detector or a negative luminescent source.
46 Citations
18 Claims
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1. A semiconductor diode comprising;
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a first contact zone;
an active layer;
a second contact zone;
the first contact zone being doped with the opposite dopant type than that of the active layer;
the second contact zone being doped with the same dopant type as the active layer;
the first contact zone, the active layer and the second contact zone being arranged in a stack such that the active layer is located between the first contact zone and the second contact zone;
wherein the semiconductor diode structure further comprises an additional layer which is doped with the same dopant type as the active layer and which has a wider bandgap than the active layer and, wherein the additional layer is located between the active layer and the first contact zone and wherein the additional layer has a band gap lower than that of the second contact zone. - View Dependent Claims (2, 3, 4, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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5. A semiconductor diode comprising;
- a first contact zone;
an active layer;
a second contact zone;
the first contact zone being doped with the opposite dopant type than that of the active layer;
the second contact zone being doped with the same dopant type as the active layer;
the first contact zone, the active layer and the second contact zone being arranged in a stack such that the active layer is located between the first contact zone and the second contact zone;
wherein the semiconductor diode structure further comprises an additional layer which is doped with the same dopant type as the active layer and which has a wider bandgap than the active layer, wherein the additional layer is located between the active layer and the first contact zone, wherein the second contact zone consists of;
a heavily doped layer and a buffer layer of lightly doped material;
the heavily doped layer and buffer layer being doped with the same dopant type, the heavily doped layer being located furthest from the active layer, and the arrangement being such that two excluding interfaces are formed between the active layer and the buffer layer of lightly doped material and between the buffer layer of lightly doped material and the heavily doped layer wherein the doping concentration of the buffer layer of lightly doped material of the second contact zone is substantially similar to the doping concentration of the additional layer.
- a first contact zone;
Specification