Background technology
Now, the structure of semi-conductor chip all is to make various devices on silicon substrate, and the line by the metal level above the device interconnects device then, thereby forms the circuit of various different structures.And in the semi-conductor chip, be used for realizing that by through hole or contact hole the line with device and metal level couples together, and specific circuit node on the end points of device or the metal level is drawn, thereby can be connected with the circuit beyond the chip.But, owing to the semiconductor core blade technolgy becomes increasingly complex, in the semiconductor fabrication process, may be because of various factors, such as interlayer film CMP (chemically mechanical polishing), tungsten CMP, photoetching interference effect, particle, film are subside etc. and to be caused tungsten residual and cause short circuit, finally cause yield to descend.
At the problems referred to above, not at the special electric performance test structure of through hole and contact hole short circuit, onlinely also can only lean against line visual examination (KLA) in the prior art, can only could confirm by the electrical characteristics failure analysis during inefficacy.
Summary of the invention
Technical matters to be solved by this invention provides through hole or contact hole structure for detecting short circuit in a kind of semiconductor devices, can detect the through hole that causes owing to a variety of causes or the short circuit of contact hole easily, thereby can in time adjust, guarantee the qualification rate of product technology.
For solving the problems of the technologies described above, the technical scheme of through hole or contact hole structure for detecting short circuit is in the semiconductor devices of the present invention, two groups of adjacent metal lines are set on the metal level on be provided with the interlayer film of regularly arranged through hole or contact hole, described two groups of metal connecting line not conductings mutually under normal condition, described two groups of metal connecting lines are drawn by its through hole separately.
The present invention is by said structure, can detect the through hole that causes owing to a variety of causes or the short circuit of contact hole easily, thereby can in time adjust the qualification rate of assurance product to technology.
Embodiment
The invention provides through hole or contact hole structure for detecting short circuit in a kind of semiconductor devices, as depicted in figs. 1 and 2, two groups of adjacent metal lines are set on the metal level on be provided with the interlayer film of regularly arranged through hole or contact hole, described two groups of metal connecting line not conductings mutually under normal condition, described two groups of metal connecting lines are drawn by its through hole separately.
In order to save chip area, through hole or contact hole structure for detecting short circuit are arranged in the scribe line of chip in the semiconductor devices of the present invention.
As shown in Figure 1, preparation has various devices and forms device layer 2 on the silicon substrate 1, and device layer is provided with interlayer film 3, above the interlayer film 3 metal level can be set, with the device of device layer according to specific circuit turn-on.Through hole 4 is arranged on the interlayer film 3, with the metal level conducting on device layer under the interlayer film 3 and the interlayer film.Metal level is provided with described metal connecting line 5.Under the normal condition, it between the adjacent metal line 5 not conducting, but work as because interlayer film CMP (chemically mechanical polishing), tungsten CMP, photoetching interference effect, particle, film are subside etc. and to be caused tungsten 6 residual and when causing short circuit, two metal connecting lines 5 will conducting, just can detect the short circuit of contact hole whereby.
The semiconductor core sector-meeting that has is provided with a plurality of metal levels, and through hole or contact hole structure for detecting short circuit can also be arranged between a plurality of metal levels in the semiconductor devices of the present invention.As shown in Figure 2, because metal level is not in the growth of the position of scribe line, therefore understand the interlayer film 3 of direct growth last layer through hole on the interlayer film 7 of lower floor's through hole, interlayer film 3 is provided with through hole or contact hole 4, and the metal levels above the interlayer film 3 are provided with metal connecting line 5.Under the normal condition, it between the adjacent metal line 5 not conducting, but work as because interlayer film CMP (chemically mechanical polishing), tungsten CMP, photoetching interference effect, particle, film are subside etc. and to be caused tungsten 6 residual and when causing short circuit, two metal connecting lines 5 will conducting, just can detect the short circuit of contact hole whereby.
As shown in Figure 3 and Figure 4, described metal connecting line is a prong like, and with the through hole or the same strip metal line 5 of contact hole 4 connections of delegation, the through hole of adjacent lines or contact hole connect different metal connecting lines respectively, and through hole 8 is drawn metal connecting line 5, to detect.Described prong like can be set to the Y direction, as shown in Figure 3, also can be set to directions X, as shown in Figure 4.
As shown in Figure 5, described metal connecting line can also be helical structure, and described through hole or contact hole 4 all are connected with a strip metal line 5 wherein, and through hole 8 is drawn metal connecting line 5.
With Fig. 3 or structure shown in Figure 4 is example, in final electrical characteristics test, monitor the leakage current of prong like, leakage current is greater than 1nA, and the design rule short-circuit structure that this layer metal connecting line short-circuit structure and metal connecting line 90% dwindles is normal, then can be judged to be this layer through hole or contact hole and have short circuit, it is residual to have tungsten.
In sum, the present invention is by said structure, can detect the through hole that causes owing to a variety of causes or the short circuit of contact hole easily, thereby can in time adjust the qualification rate of assurance product to technology.