Disclosure of Invention
In view of the above, an object of the present invention is to provide a thyristor structure to solve the problem of poor dynamic characteristics in the conventional thyristor structure.
In order to achieve the above purpose, the embodiment of the present application adopts the following technical solutions:
a silicon controlled structure comprising an electrode structure and a semiconductor structure, the electrode structure being electrically connected to the semiconductor structure, the semiconductor structure comprising:
at least one N-type semiconductor material layer;
at least one P-type semiconductor material layer;
at least one of the at least one N-type semiconductor material layer and the at least one P-type semiconductor material layer is a target semiconductor layer, and the target semiconductor layer comprises a plurality of sub-regions which are distributed in sequence and have different doping concentrations and/or different doping elements.
In a preferred option of this embodiment of the present invention, in the silicon controlled rectifier structure, the at least one N-type semiconductor material layer includes a first semiconductor layer and a fourth semiconductor layer, and the at least one P-type semiconductor material layer includes a second semiconductor layer and a third semiconductor layer;
the second semiconductor layer is located on one side of the first semiconductor layer, the third semiconductor layer is located on one side, away from the second semiconductor layer, of the first semiconductor layer, and the fourth semiconductor layer is located on one side, away from the first semiconductor layer, of the second semiconductor layer.
In a preferred option of this embodiment of the present invention, in the silicon controlled rectifier structure, the at least one N-type semiconductor material layer further includes a fifth semiconductor layer, and the fifth semiconductor layer is located on a side of the third semiconductor layer away from the first semiconductor layer.
In a preferred option of this embodiment, in the silicon controlled rectifier structure, the second semiconductor layer and the third semiconductor layer are the target semiconductor layer respectively.
In a preferred option of this embodiment, in the silicon controlled rectifier structure, the fourth semiconductor layer and the fifth semiconductor layer are the target semiconductor layer respectively.
In a preferred option of this embodiment, in the silicon controlled rectifier structure, the second semiconductor layer, the third semiconductor layer, the fourth semiconductor layer and the fifth semiconductor layer are the target semiconductor layers respectively.
In a preferred option of this embodiment of the present invention, in the silicon controlled rectifier structure, in a direction in which the plurality of semiconductor material layers included in the semiconductor structure are sequentially stacked, each of the target semiconductor layers includes a plurality of sub-regions that are sequentially stacked and distributed and have different doping concentrations and/or different doping elements.
In a preferred option of the embodiment of the present application, in the silicon controlled rectifier structure, in a direction in which the plurality of semiconductor material layers included in the semiconductor structure are sequentially stacked, each of the target semiconductor layers includes a plurality of sub-regions that are sequentially stacked and distributed and in which doping concentrations are sequentially increased or decreased.
In a preferred option of this embodiment of the present invention, in the above silicon controlled structure, the at least one N-type semiconductor material layer and the at least one P-type semiconductor material layer sequentially stacked include at least one target surface in two surfaces in the stacking direction:
the target surface comprises an anode region and a cathode region, the anode region and the cathode region are respectively in contact with the electrode structure, the anode region and the electrode structure form ohmic contact after heavy doping treatment, and the cathode region is not subjected to heavy doping treatment.
In a preferred option of the embodiment of the present application, in the silicon controlled rectifier structure, the target surface further includes an isolation region, and the isolation region is not heavily doped.
The application provides a silicon controlled rectifier structure is through forming a plurality of subregion that the doping concentration that distributes in proper order is different and/or the doping element is different in target semiconductor layer for can form the different doping concentration and/or the doping element of a plurality of levels, thereby promote the dynamic characteristic of silicon controlled rectifier, and then improve the not good problem of dynamic characteristic that exists in the silicon controlled rectifier structure now.
In order to make the aforementioned objects, features and advantages of the present application more comprehensible, preferred embodiments accompanied with figures are described in detail below.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all the embodiments. The components of the embodiments of the present application, generally described and illustrated in the figures herein, can be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present application, presented in the accompanying drawings, is not intended to limit the scope of the claimed application, but is merely representative of selected embodiments of the application. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
As shown in fig. 1, the present embodiment provides a thyristor structure 100. The thyristor structure 100 may include a semiconductor structure 110 and an electrode structure 120.
In detail, the semiconductor structure 110 is electrically connected to the electrode structure 120. The semiconductor structure 110 includes at least one layer 111 of N-type semiconductor material and at least one layer 115 of P-type semiconductor material. At least one of the at least one N-type semiconductor material layer 111 and the at least one P-type semiconductor material layer 115 is a target semiconductor layer, and the target semiconductor layer includes a plurality of sub-regions (e.g., region 1, region 2, and region 3 shown in fig. 1) with different doping concentrations and/or different doping elements distributed in sequence.
Based on the method, by forming a plurality of sub-regions with different doping concentrations and/or different doping elements which are distributed in sequence in the target semiconductor layer, a plurality of levels of different doping concentrations and/or different doping elements can be formed, so that the dynamic characteristics of the silicon controlled rectifier are improved, and the problem of poor dynamic characteristics in the existing silicon controlled rectifier structure 100 is solved.
It is understood that, in an alternative example, in conjunction with fig. 2, the at least one N-type semiconductor material layer 111 includes a first semiconductor layer L1 and a fourth semiconductor layer L4, and the at least one P-type semiconductor material layer 115 includes a second semiconductor layer L2 and a third semiconductor layer L3.
The second semiconductor layer L2 is located on the side of the first semiconductor layer L1, the third semiconductor layer L3 is located on the side of the first semiconductor layer L1 away from the second semiconductor layer L2, and the fourth semiconductor layer L4 is located on the side of the second semiconductor layer L2 away from the first semiconductor layer L1. Based on this, a one-way thyristor including the first semiconductor layer L1, the second semiconductor layer L2, the third semiconductor layer L3, and the fourth semiconductor layer L4 may be formed.
It is understood that, in another alternative example, in conjunction with fig. 3, the at least one N-type semiconductor material layer 111 includes a first semiconductor layer L1, a fourth semiconductor layer L4, and a fifth semiconductor layer L5, and the at least one P-type semiconductor material layer 115 includes a second semiconductor layer L2 and a third semiconductor layer L3.
The second semiconductor layer L2 is located on one side of the first semiconductor layer L1, the third semiconductor layer L3 is located on one side of the first semiconductor layer L1 away from the second semiconductor layer L2, the fourth semiconductor layer L4 is located on one side of the second semiconductor layer L2 away from the first semiconductor layer L1, and the fifth semiconductor layer L5 is located on one side of the third semiconductor layer L3 away from the first semiconductor layer L1. Based on this, a triac including the first semiconductor layer L1, the second semiconductor layer L2, the third semiconductor layer L3, the fourth semiconductor layer L4, and the fifth semiconductor layer L5 may be formed.
It is to be understood that, on the basis of the above example, in an alternative example, the fourth semiconductor layer L4 may cover a partial region of the second semiconductor layer L2 on the basis that the fourth semiconductor layer L4 is located on the side of the second semiconductor layer L2 away from the first semiconductor layer L1.
In addition, a portion of the second semiconductor layer L2 not covered by the fourth semiconductor layer L4 on the side of the second semiconductor layer L2 away from the first semiconductor layer L1 is located in the same plane as the side of the fourth semiconductor layer L4 away from the first semiconductor layer L1.
It is to be understood that, on the basis of the above example, in an alternative example, the fifth semiconductor layer L5 may cover a partial region of the third semiconductor layer L3 on the basis that the fifth semiconductor layer L5 is located on the side of the third semiconductor layer L3 away from the first semiconductor layer L1.
In addition, a portion of the third semiconductor layer L3 not covered by the fifth semiconductor layer L5 on the side of the third semiconductor layer L3 away from the first semiconductor layer L1 is located in the same plane as the side of the fifth semiconductor layer L5 away from the first semiconductor layer L1.
It is understood that, in an alternative example, in conjunction with fig. 4, the second semiconductor layer L2 and the third semiconductor layer L3 may be the target semiconductor layer, respectively, and the first semiconductor layer L1, the fourth semiconductor layer L4, and the fifth semiconductor layer L5 may not belong to the target semiconductor.
That is, the second semiconductor layer L2 and the third semiconductor layer L3 may include a plurality of sub-regions having different doping concentrations and/or different doping elements, respectively, which are sequentially distributed. The first semiconductor layer L1, the fourth semiconductor layer L4 and the fifth semiconductor layer L5 may not include a plurality of sub-regions with different doping concentrations and/or different doping elements distributed in sequence, such as only one doping concentration, or only one doping element.
It is understood that, in another alternative example, in conjunction with fig. 5, the fourth semiconductor layer L4 and the fifth semiconductor layer L5 may be the target semiconductor layers, respectively, and the first semiconductor layer L1, the second semiconductor layer L2, and the third semiconductor layer L3 may not belong to the target semiconductor.
That is, the fourth semiconductor layer L4 and the fifth semiconductor layer L5 may include a plurality of sub-regions having different doping concentrations and/or different doping elements, respectively, which are sequentially distributed. The first semiconductor layer L1, the second semiconductor layer L2 and the third semiconductor layer L3 may not include a plurality of sub-regions with different doping concentrations and/or different doping elements distributed in sequence, such as only one doping concentration, only one doping element, etc.
It is to be understood that, in another alternative example, in conjunction with fig. 6, the second semiconductor layer L2, the third semiconductor layer L3, the fourth semiconductor layer L4, and the fifth semiconductor layer L5 may be the target semiconductor layers, respectively, and the first semiconductor layer L1 may not belong to the target semiconductor.
That is, the second semiconductor layer L2, the third semiconductor layer L3, the fourth semiconductor layer L4, and the fifth semiconductor layer L5 may include a plurality of sub-regions having different doping concentrations and/or different doping elements, respectively, which are sequentially distributed. The first semiconductor layer L1 may not include a plurality of sub-regions with different doping concentrations and/or different doping elements distributed in sequence, such as only one doping concentration, only one doping element, etc.
It is understood that in an alternative example, for the N-type semiconductor material layer 111, the doping elements may include, but are not limited to, one or more of nitrogen, phosphorus, arsenic, antimony, bismuth, and the like. For the P-type semiconductor material layer 115, the doping elements may include, but are not limited to, one or more of boron, aluminum, gallium, indium, thallium, and the like.
It is understood that, on the basis of the above example, in order to make the dynamic characteristics of the silicon controlled rectifier structure 100 better, in an alternative example, in a direction in which the semiconductor structure 110 includes a plurality of semiconductor material layers that are sequentially stacked, each of the target semiconductor layers includes a plurality of sub-regions that are sequentially stacked and distributed and have different doping concentrations and/or different doping elements.
It is understood that, in an alternative example, in a direction in which the semiconductor structure 110 includes a plurality of semiconductor material layers stacked in sequence, each of the target semiconductor layers includes a plurality of sub-regions which are sequentially stacked and have sequentially increasing doping concentrations.
It is understood that, in an alternative example, in a direction in which the semiconductor structure 110 includes a plurality of semiconductor material layers stacked in sequence, each of the target semiconductor layers includes a plurality of sub-regions distributed in a stacked manner in sequence and having doping concentrations reduced in sequence.
It is to be understood that, in an alternative example, the directions of sequentially increasing or decreasing the plurality of sub-regions included in each target semiconductor layer may not be the same or may be different.
For example, in an alternative example, the first semiconductor layer L1 may not belong to the target semiconductor layer, and the other semiconductor layers located on both sides of the first semiconductor layer L1 include a plurality of sub-regions which are sequentially stacked and distributed and whose doping concentrations are sequentially increased in a direction from a side of the semiconductor layer close to the first semiconductor layer L1 to a side of the semiconductor layer away from the first semiconductor layer L1.
It is to be understood that, on the basis of the above example, in an alternative example, the at least one N-type semiconductor material layer 111 and the at least one P-type semiconductor material layer 115 may be sequentially stacked, and include at least one target surface in both surfaces in the stacking direction after being stacked.
With reference to fig. 7, the target surface includes an anode region 130 and a cathode region 140, the anode region 130 and the cathode region 140 are respectively in contact with the electrode structure 120, the anode region 130 forms ohmic contact with the electrode structure 120 after being heavily doped, and the cathode region 140 is not heavily doped.
Based on this, since the anode region 130 is heavily doped and the cathode region 140 is not heavily doped, the silicon controlled rectifier structure 100 can have ohmic contact characteristics, and can also avoid the problem that the trigger current is increased after the cathode region 140 is heavily doped, which causes the reduction of the current trigger sensitivity of the silicon controlled rectifier structure 100.
It is understood that heavily doping the anode region 130 may refer to heavily doping at least a region of the anode region 130 that is in contact with the electrode structure 120. The heavily doped area is not particularly limited, for example, the heavily doped area may be larger than an area of a region of the anode region 130 contacting the electrode structure 120, or the heavily doped area may be equal to an area of a region of the anode region 130 contacting the electrode structure 120.
It is understood that, in the above example, the anode region 130 may refer to a region corresponding to the P-type semiconductor material layer 115, and the cathode region 140 may refer to a region corresponding to the N-type semiconductor material layer 111.
It will be appreciated that on the basis of the above example, in an alternative example, the target surface may further comprise a gate region 150 and an isolation region 160.
The isolation region 160 is located between the anode region 130 and the cathode region 140, and the gate region 150, and the isolation region 160 is not heavily doped, so that the problems of gate short and the like can be avoided.
Based on this, in an alternative example, the region not heavily doped may include only the cathode region 140. In another alternative example, the region not heavily doped may include only the isolation region 160. In another alternative example, the regions that are not heavily doped may include the cathode region 140 and the isolation region 160.
It is to be understood that in the above examples, the specific patterns of the anode region 130, the cathode region 140, the gate region 150 and the isolation region 160 are not limited, and may be other patterns than the example shown in fig. 7, for example.
It will be appreciated that in an alternative example, in conjunction with fig. 8, the electrode structure 120 may include a cathode anode structure 121 and a gate structure 122. The cathode-anode structure 121 is in contact with the anode region 130 and the cathode region 140 to be electrically connected. The gate structure 122 may be in contact with the gate region 150 for electrical connection. The number of the cathode/anode structures 121 is at least two, and when one of the cathode structures is used as a cathode structure, the other can be used as an anode structure.
It is understood that, in an alternative example, both surfaces in the stacking direction after the at least one N-type semiconductor material layer 111 and the at least one P-type semiconductor material layer 115 are stacked may belong to the target surface, wherein one target surface may include the anode region 130, the cathode region 140, the gate region 150, and the isolation region 160, and the other target surface may include the anode region 130 and the cathode region 140.
To sum up, the silicon controlled rectifier structure 100 that this application provided is through forming a plurality of subregion that the doping concentration that distributes in proper order is different and/or the doping element is different in the target semiconductor layer for can form the different doping concentration and/or the doping element of a plurality of levels, thereby promote the dynamic characteristic of silicon controlled rectifier, and then improve the not good problem of dynamic characteristic that exists among the silicon controlled rectifier structure 100 now.
The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.