Drawings
In order to make the above and other objects, features, advantages and embodiments of the present disclosure more comprehensible, the following description is given:
fig. 1 is a schematic diagram of an inductor and a semiconductor device according to some embodiments of the present disclosure;
FIG. 2 is a schematic diagram of a semiconductor device according to some embodiments of the present disclosure;
FIG. 3 is a cross-sectional view of a section line of FIG. 2 shown in accordance with some embodiments of the present disclosure;
FIG. 4 is a cross-sectional view of a section line of FIG. 2 shown in accordance with some embodiments of the present disclosure;
FIG. 5 is a schematic diagram of a semiconductor device according to some embodiments of the present disclosure; and
fig. 6 is a schematic diagram illustrating a semiconductor device in accordance with some embodiments of the present disclosure.
Description of the symbols
110: inductor
120: semiconductor device with a plurality of semiconductor chips
120A: semiconductor device with a plurality of semiconductor chips
120B: semiconductor device with a plurality of semiconductor chips
120C: semiconductor device with a plurality of semiconductor chips
122: metal oxide semiconductor capacitor structure
1221: polycrystalline silicon layer
1222: oxide definition layer
1223. M1: a first metal layer
124: patterned shielding structure
AA': section line
BB': section line
M11: first conductive member
M12: second conductive member
M2: second metal layer
V1: first connecting through hole
V2: second connecting through hole
V3: third connecting through hole
X: direction of rotation
Y: direction of rotation
Z: direction of rotation
C1: first conductive segment
C2: second conductive segment
C3: third conductive segment
Detailed Description
The following embodiments are described in detail with reference to the accompanying drawings, but the embodiments are not provided to limit the scope of the disclosure, and the description of the structure operation is not intended to limit the execution sequence thereof, and any structure resulting from the rearrangement of elements to produce an apparatus with equivalent technical effect is included in the scope of the disclosure. In addition, the drawings are for illustrative purposes only and are not drawn to scale. For ease of understanding, the same or similar elements will be described with the same reference numerals in the following description.
It will be understood that the terms first, second, third, etc. may be used herein to describe various elements, components, regions, layers and/or sections. These elements, components, regions, layers and/or regions should not be limited by these terms. These terms are only used to distinguish one element, component, region, layer or section from another. Thus, a first element, component, region, layer or section discussed below could be termed a second element, component, region, layer or section without departing from the teachings of the present disclosure.
Refer to fig. 1. Fig. 1 is a schematic diagram illustrating an inductor 110 and a semiconductor device 120, in accordance with some embodiments of the present disclosure. In the example of fig. 1, the semiconductor device 120 is disposed below the inductor 110.
Refer to fig. 2, 3 and 4. Fig. 2 is a schematic diagram illustrating a semiconductor device 120A in accordance with some embodiments of the present disclosure. Fig. 3 is a cross-sectional view of the cross-sectional line AA' of fig. 2, shown in accordance with some embodiments of the present disclosure. Fig. 4 is a cross-sectional view of the cross-sectional line BB' of fig. 2, shown in accordance with some embodiments of the present disclosure. In some embodiments, the semiconductor device 120A of fig. 2 is used to implement the semiconductor device 120 of fig. 1.
The semiconductor device 120A includes a metal-oxide-semiconductor capacitor (MOSCAP) structure 122 and a patterned shielding structure 124. The patterned shielding structure 124 is disposed above the mos capacitor structure 122.
In detail, the mos capacitor structure 122 includes a polysilicon layer 1221, an Oxide Definition (OD) layer 1222, a first metal layer 1223 (e.g., M1 layer, referred to as a first metal layer M1, hereinafter), a plurality of via (via) V1, and a plurality of via V2. The polysilicon layer 1221 is disposed over the oxide definition layer 1222. The first metal layer 1223 is disposed over the polysilicon layer 1221.
The patterned shielding structure 124 is disposed over the first metal layer 1223. The patterned shielding structure 124 may be implemented by a second metal layer (e.g., a layer M2, which will be referred to as a second metal layer M2).
In some related art, the magnetic field generated when the inductor located above operates may cause the semiconductor device located below to generate eddy current. The eddy current affects the quality factor (Q value) of the upper inductor.
In contrast to the related art, the semiconductor device 120A of the present disclosure includes the patterned shielding structure 124. In some embodiments, the patterned shielding structure 124 may be grounded. The patterned shielding structure 124 may reduce the mutual inductance in the inductor 110 to prevent the semiconductor device 120A from generating the above-mentioned eddy current, thereby effectively maintaining the quality factor of the inductor 110.
In addition, in some other related technologies, the mos capacitor structure needs to be implemented with at least three metal layers.
In contrast to the other related technologies, the mos capacitor structure 122 in the present disclosure is implemented by only two metal layers (the first metal layer M1 and the second metal layer M2). Accordingly, the metal oxide semiconductor capacitor structure 122 of the present disclosure has the advantages of low cost and simple structure.
Reference is again made to fig. 3. The first metal layer M1 includes a first conductive element M11 and at least a second conductive element M12. In the example of FIG. 3, the first metal layer M1 includes two second conductive features M12. The first conductive member M11 is configured to receive a first voltage. The second metal layer M2 is for receiving a second voltage. The second voltage is different from the first voltage. For example, the first voltage may be greater than the second voltage. In some embodiments, the first voltage is a positive voltage and the second voltage is a ground voltage.
Reference is again made to fig. 4. The first conductive member M11 is connected to the polysilicon layer 1221 through the first connection via V1. Reference is again made to fig. 3. The oxide defining layer 1222 is connected to the second conductive member M12 of the first metal layer M1 through the second connection via V2. The conductive member M12 of the first metal layer M1 is connected to the second metal layer M2 through the third connecting via V3. Since the oxide definition layer 1222 connects the second conductive element M12 of the first metal layer M1 and the second metal layer M2, the voltage levels of the oxide definition layer 1222, the second conductive element M12 of the first metal layer M1 and the second metal layer M2 are the same.
Reference is again made to fig. 2. The first projection range of the first conductive element M11 of the first metal layer M1 on the plane formed by the direction X and the direction Y is located within the second projection range of the second metal layer M2 on the plane formed by the direction X and the direction Y. In other words, the area of the projection range of the first conductive element M11 of the first metal layer M1 on the plane formed by the direction X and the direction Y is smaller than the area of the projection range of the second metal layer M2 on the plane formed by the direction X and the direction Y. The direction X and the direction Y are parallel to the direction Z.
The second conductive member M12 has an approximately H shape. In particular, second conductive member M12 includes a first conductive segment C1, a second conductive segment C2, and a third conductive segment C3. The first conductive segment C1 is connected to the oxide definition layer 1222 through a second connection via V2. The second conductive segment C2 is connected to the second metal layer M2 through the third connecting via V3. A third conductive segment C3 connects first conductive segment C1 and second conductive segment C2. Third conductive segment C3 is disposed perpendicular to first conductive segment C1 and second conductive segment C2. First conductive segment C1 is disposed parallel to second conductive segment C2. First conductive segment C1 and second conductive segment C2 extend in direction X. Third conductive segment C3 extends in direction Y.
In some related arts, the mos capacitor structure has a drawback of large capacitance and a large number of loops (loops), which are disadvantageous for the quality factor of the mos capacitor structure.
Compared to the related art, in the embodiment of fig. 2, since the second conductive element M12 is formed by a plurality of conductive segments, and the projection range of the second conductive element M12 on the plane formed by the direction X and the direction Y and the projection range of the polysilicon layer 1221 on the plane formed by the direction X and the direction Y are less overlapped (only the second conductive segment C2 and the third conductive segment C3 are overlapped with the polysilicon layer 1221), the capacitance (e.g., parasitic capacitance) can be reduced and the loop formation can be reduced, so as to improve the quality factor.
In the example of FIG. 2, the length of first conductive segment C1 is greater than the length of second conductive segment C2. In some other embodiments, the length of first conductive segment C1 may be equal to or less than the length of second conductive segment C2.
For example, in fig. 2, a first connection direction of the first through holes V1 on the left side of the drawing is a direction Y, and a second connection direction of the second through holes V2 on the top side of the drawing is a direction X. The direction Y is perpendicular to the direction X. That is, the first connecting direction of the first connecting vias V1 on the left side of the drawing is perpendicular to the second connecting direction of the second connecting vias V2 on the top side of the drawing. The second connecting vias V2 above the drawing and the second connecting vias V2 below the drawing are disposed on two sides of the polysilicon layer 1221, respectively.
For example, in fig. 2, the connection direction of the first through holes V1 on the left side of the drawing is the direction Y, and the connection direction of the third through holes V3 on the top side of the drawing is the direction X. The direction Y is perpendicular to the direction X. That is, the connection line of the first connecting vias V1 on the left side of the drawing is perpendicular to the connection line of the third connecting vias V3 on the top side of the drawing.
It is to be noted that the number of the first connecting vias V1, the number of the second connecting vias V2, and the number of the third connecting vias V3 in fig. 2 are only examples, and various suitable numbers are within the scope of the disclosure.
In some embodiments, the semiconductor devices 120A of fig. 2 may be repeatedly arranged and connected along a direction. For example, the semiconductor devices 120A of fig. 2 may be repeatedly arranged and connected along the direction X to form larger semiconductor devices and may be used in applications requiring larger dimensions.
Refer to fig. 5. Fig. 5 is a schematic diagram illustrating a semiconductor device 120B in accordance with some embodiments of the present disclosure. The main difference between the semiconductor device 120B of fig. 5 and the semiconductor device 120A of fig. 2 is that the second conductive members M12 of the first metal layer M1 of the semiconductor device 120B of fig. 5 are rectangular. In the example of fig. 5, the semiconductor device 120B has a rectangular parallelepiped shape, and the projection range of the second conductive member M12 on the plane formed by the direction X and the direction Y overlaps with the projection range of the polysilicon layer 1221 on the plane formed by the direction X and the direction Y more, so that the capacitance value thereof is large. In addition, the capacitance between the first conductive element M11 and the second conductive element M12 is also larger. Accordingly, the semiconductor device 120B of fig. 5 can be used in applications requiring larger capacitance values.
In some embodiments, the semiconductor devices 120B of fig. 5 may be repeatedly arranged and connected along a direction. For example, the semiconductor devices 120B of fig. 5 may be repeatedly arranged and connected along the direction X to form larger semiconductor devices and may be used in applications requiring larger dimensions.
Refer to fig. 6. Fig. 6 is a schematic diagram illustrating a semiconductor device 120C in accordance with some embodiments of the present disclosure. One of the main differences between the semiconductor device 120C of fig. 6 and the semiconductor device 120A of fig. 2 is that the semiconductor device 120C only includes the first through vias V1 on the left of the drawing and does not include the first through vias V1 on the right of the drawing of fig. 2. In addition, another major difference between the semiconductor device 120C of FIG. 6 and the semiconductor device 120A of FIG. 2 is that the second conductive component M12 below the plane of the drawing includes only the first conductive segment C1 and does not include the second conductive segment C2, the third conductive segment C3, and the third connecting via V3 below the plane of the drawing of FIG. 2.
In the embodiment of fig. 6, since the projection range of the second conductive component M12 on the plane formed by the directions X and Y and the projection range of the polysilicon layer 1221 on the plane formed by the directions X and Y are less overlapped (the overlapping portions of the second conductive segment C2 and the third conductive segment C3 below the plane of the drawing of fig. 2 and the polysilicon layer 1221 are less overlapped), the capacitance (e.g., parasitic capacitance) can be more effectively reduced and the loop formation can be reduced, so as to improve the quality factor value.
In some embodiments, the semiconductor devices 120C of fig. 6 may be repeatedly arranged and connected along a direction. For example, the semiconductor device 120C of fig. 6 may be repeatedly arranged and connected along the direction X to form a larger semiconductor device and may be used in applications requiring larger dimensions.
In summary, the semiconductor device of the present disclosure can utilize two metal layers to realize the mos capacitor structure and the patterned shielding structure, and can improve the quality factor value.
Although the present disclosure has been described with reference to the above embodiments, it should be understood that various changes and modifications can be made by one skilled in the art without departing from the spirit and scope of the disclosure, and therefore, the scope of the disclosure should be limited only by the appended claims.