WO2001054186A1 - Procede d'analyse de defaillances utilisant un microscope a emission, systeme correspondant et procede de production de dispositifs a semiconducteur - Google Patents
Procede d'analyse de defaillances utilisant un microscope a emission, systeme correspondant et procede de production de dispositifs a semiconducteur Download PDFInfo
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- WO2001054186A1 WO2001054186A1 PCT/JP2001/000018 JP0100018W WO0154186A1 WO 2001054186 A1 WO2001054186 A1 WO 2001054186A1 JP 0100018 W JP0100018 W JP 0100018W WO 0154186 A1 WO0154186 A1 WO 0154186A1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/28—Testing of electronic circuits, e.g. by signal tracer
- G01R31/302—Contactless testing
- G01R31/308—Contactless testing using non-ionising electromagnetic radiation, e.g. optical radiation
- G01R31/311—Contactless testing using non-ionising electromagnetic radiation, e.g. optical radiation of integrated circuits
Definitions
- the present invention provides an emission microscope for performing failure analysis on a semiconductor device in which a plurality of different types of circuit blocks such as a system LSI are mixed, based on a light emission image captured by the emission microscope.
- the present invention relates to a failure analysis method, a system thereof, and a semiconductor device manufacturing method used.
- the manufacture of a semiconductor device includes a wafer processing step of forming a semiconductor device on a so-called silicon substrate, and an assembling step of separating the semiconductor device from the substrate and performing packaging and the like.
- the wafer processing process consists of large steps such as element isolation, element formation, and wiring. These major steps consist of repetition of processes such as film formation, exposure, and etching. Before and after each treatment, processes such as cleaning and quality inspection are added as necessary. For this reason, the number of processing steps in the wafer processing step is several hundred.
- the processing dimensions of these processes are often less than 1 micrometer, and the processing precision is about one-tenth of the processing dimensions, and extremely fine and high-precision processing is performed.
- a failure analysis of the semiconductor device is performed for each unit scanning area, or a light emission wafer map is generated by displaying the light emission status of each of the plurality of semiconductor devices on a predetermined wafer based on the light emission information.
- a failure analysis method for a semiconductor device using an emission microscope that performs failure analysis of a plurality of semiconductor devices based on the light emitting wafer map is described.
- the above-mentioned prior arts 2 and 3 include an LSI for a semiconductor device in which a plurality of different types of circuit blocks such as a logic unit, a memory unit, and a pad unit are mixed, such as a system LSI.
- a system LSI for a semiconductor device in which a plurality of different types of circuit blocks such as a logic unit, a memory unit, and a pad unit are mixed, such as a system LSI.
- An object of the present invention is to solve the above problems by providing a semiconductor device (semiconductor substrate) on which an LSI chip having a plurality of different types of circuit blocks is arranged, such as a system LSI, in a circuit block inside the LSI chip.
- An object of the present invention is to provide a failure analysis method using an emission microscope and a system thereof, which enable failure analysis to be performed based on a light emission image detected by the emission microscope in association with the above.
- Another object of the present invention is to provide a semiconductor device (semiconductor substrate) on which an LSI chip having a plurality of different types of circuit blocks, such as a system LSI, is arranged, for a circuit block inside the LSI chip. It is an object of the present invention to provide a method of manufacturing a semiconductor device which can perform a defect analysis on the basis of a light emission image detected by an emission microscope and can manufacture the semiconductor device at a high yield.
- the present invention examines an arrangement state of light emitting points based on a light emission image detected by an emission microscope for a semiconductor device on which LSI chips are arranged, and Based on the arrangement state, the light emitting types are classified into a plurality of light emitting types (isolated, dense, linear, and periodic or broken line light emitting modes), and the number of occurrences of each of the classified light emitting types is determined for each of the LSI chips and for the Z or A light emission calculation process for calculating different types of circuit blocks in the LSI chip, and a failure analysis based on the number of occurrences for each light emission type for each LSI chip and each Z or circuit block calculated in the light emission calculation process And a failure analysis method using an emission microscope.
- the light emitting types are classified into a plurality of light emitting types (isolated, dense, linear, and periodic or broken line light emitting modes), and the number of occurrences of each of the classified light emitting types is determined for each of the LSI chips and for the Z or A
- each light-emitting type is The preparation process of preparing a database that registers the correspondence between each type and the probable cause of failure, and the generation of emission points based on the emission image detected by an emission microscope for a semiconductor device on which LSI chips are arranged
- the arrangement state is checked, the light emitting points are classified into a plurality of light emission types based on the checked arrangement state, and the number of occurrences of each of the classified light emission types is determined for each of the LSI chips and for each type of circuit block.
- the light emission calculation process to be calculated in accordance with the light emission calculation process, and the corresponding cause of failure from the database prepared in the preparation process according to the number of occurrences of each light emission type for each circuit block for each LSI chip calculated in the light emission calculation process.
- This is a failure analysis method using an emission microscope, characterized by having an analysis process of searching and outputting.
- the present invention examines the arrangement state of light emitting points on a semiconductor device on which LSI chips are arranged based on a light emission image detected by an emission microscope, and based on the examined arrangement state of light emitting points.
- a failure analysis method using an emission microscope comprising: an analysis step of performing a failure analysis based on light emission map information for each type displayed in the light emission display process.
- the present invention is characterized in that light emission map information for each light emission type in a light emission display process is displayed in LSI chip units.
- the present invention examines an arrangement state of light emitting points for different types of circuit blocks in the LSI chip based on a light emission image detected by an emission microscope for a semiconductor device on which the LSI chips are arranged, A plurality of light emission types are classified based on the arrangement state of the light emission points for each of the checked circuit blocks.
- a light emission display process of displaying light emission map information indicating the light emission points of each light emission type for each of the classified circuit blocks.
- a circuit block displayed in the light emission display process comprising: an analysis step of performing failure analysis based on light emission map information for each light emission type for each mouthpiece.
- the present invention provides an arrangement of light emitting points based on a light emission image detected by an emission microscope for a semiconductor device on which an LSI chip is arranged, or a light emitting point for each of different types of circuit blocks in an LSI chip.
- the arrangement state is checked, and the light emitting points are classified into a plurality of light emission types based on the checked arrangement state of the light emission points or the arrangement state of the light emission points for each circuit block, and the arrangement state of the light emission points for each of the classified light emission types is determined.
- a failure analysis method using an emission microscope characterized by having an analysis step of performing failure analysis by collating with foreign matter map information displayed in a foreign matter display process.
- the present invention examines the arrangement state of light emitting points on a semiconductor device on which LSI chips are arranged based on a light emission image detected by an emission microscope, and based on the examined arrangement state of light emitting points.
- a light emission calculation process in which the number of light emission types is classified into a plurality of light emission types, and the number of occurrences of each of the classified light emission types is calculated for each LSI chip and for each type of circuit block in the LSI chip or a different type of circuit block;
- a foreign matter calculation process for inspecting foreign matter including appearance defects on the semiconductor device on which the manufactured LSI chips are arranged, and calculating the number of occurrences of the inspected foreign matter for each of the LSI chips;
- the calculated number of occurrences of each light emission type for each LSI chip and the number of occurrences of foreign matter for each LSI chip calculated in the foreign matter calculation process are output in association with each other.
- the present invention provides a method of manufacturing a semiconductor device by performing a failure analysis using the failure analysis method using the emission microscope and taking measures against a failure cause estimated in a manufacturing line based on the failure analysis result.
- This is a method for manufacturing a semiconductor device as a feature.
- the present invention examines the arrangement state of light emitting points on a semiconductor device on which LSI chips are arranged based on a light emission image detected by an emission microscope, and based on the examined arrangement state of light emitting points.
- a light emission calculation device that classifies the light emission types into a plurality of light emission types, and calculates the number of occurrences of each of the light emission types for each of the LSI chips and for each circuit block of a different type in the Z or the LSI chip; And an output device for outputting the number of occurrences of each light emission type for each LSI chip.
- the present invention also provides a database in which the correspondence between each light emitting type of each circuit block for each LSI chip and the estimated cause of the defect is registered in advance, and a semiconductor device in which the LSI chips are arranged. Based on the emission image detected by the emission microscope, the arrangement state of the light emission points is examined, and the light emission points are classified into a plurality of light emission types based on the arrangement state of the examined light emission points.
- a light emission calculation device for calculating the number for each type of circuit block for each of the LSI chips, and the light emission calculation device calculates the number of light emission types for each circuit block for each circuit block for each of the LSI chips calculated by the light emission calculation device.
- a failure analysis system using an emission microscope comprising: an output device for searching for a failure cause corresponding to the failure base and outputting the failure cause.
- the present invention provides an arrangement of light emitting points or an arrangement of light emitting points for each LSI chip or an LSI chip based on a light emission image detected by an emission microscope on a semiconductor device on which the LSI chips are arranged.
- Different in The arrangement state of the light emitting points is checked for each type of circuit block, and a plurality of light emitting points are arranged based on the checked arrangement state of the light emitting points, the arrangement state of the light emitting points for each LSI chip, or the arrangement state of the light emitting points for each circuit block.
- Emission map information indicating emission points for each emission type, emission points for each emission type for each LSI chip, or emission points for each emission type for each circuit block is classified into emission types.
- a failure analysis system using an emission microscope comprising: an emission map information creation device to be created; and a display device for displaying emission map information for each type created by the emission map information creation device.
- the invention is characterized in that a light emission image is detected from a substrate side of a semiconductor device.
- the arrangement state of the light emitting points is automatically classified in units of LSI chips or in units of circuit blocks in the LSI chip based on the basic pattern. 'The failure analysis can be performed on a semiconductor device in which LSIs composed of various circuit blocks are arranged.
- FIG. 1 is a schematic configuration diagram showing one embodiment of a light emission mode classification and analysis system using an emission microscope according to the present invention.
- FIG. 2 is a diagram showing a coordinate system set for the wafer to be measured.
- FIG. 3 is a diagram illustrating a data management format managed in the data processing device.
- FIG. 4 is a diagram showing a coordinate calculation flow of a light emitting point executed in the data processing device.
- FIG. 5 is a diagram showing definitions of light emission modes classified based on the arrangement state of light emission points according to the present invention.
- FIG. 6 is a diagram illustrating a light emitting mode classified based on an arrangement state of light emitting points according to the present invention.
- FIG. 9 is a diagram showing a definition for each circuit block.
- FIG. 7 is a diagram showing a processing flow for classifying the light emission modes using the light emission mode classification and analysis system according to the present invention.
- FIG. 8 is a diagram showing an output example of a light emission mode classification result according to the present invention.
- FIG. 9 is a diagram illustrating a database in which the light emission mode classification for each circuit block and the cause of failure stored in the data storage device are associated.
- FIG. 10 is a view showing a screen on which a light emitting wafer map and a light emitting mode classification result according to the present invention are simultaneously displayed.
- FIG. 11 is a view showing a screen on which a light emitting chip map and a light emitting mode classification result according to the present invention are simultaneously displayed.
- FIG. 12 is a diagram showing an embodiment of the extraction mode map according to the present invention.
- FIG. 13 is a correlation diagram showing the correlation between the number of foreign substances and the light emission frequency according to the present invention.
- FIG. 14 is a diagram for explaining mirror image reversal when observing the back surface from the substrate side of the measurement target device 8 according to the present invention.
- the measurement system is composed of an emission microscope comprising a tester 1, a stage 2 on which a wafer to be measured (semiconductor device) 3 is mounted, a prober 4, and a camera 5 for taking an emission image.
- the emission microscope is described in (âFailure Analysis Technology Using Emission Microscopeâ, NEC Technical Report Vol. 46 No. 11/1993 P40-P45). As shown in FIG. It detects weak light emitted from a good part or a part that is loaded due to the presence of a defect, and outputs the light-emitting part with high accuracy.
- the data processing system includes a data processing device 6, a data storage device 7, and a data output device 8.
- the tester 1 applies a voltage and a signal to the measured device (semiconductor device) 3 via the probe 5.
- the measurement is usually performed in chip units. If multiple chips are measured at the same time, a procedure for extracting information for each chip from the measurement results in a later data processing system is required.
- a voltage and a signal are applied to each chip 20, and the emission image at that time is captured by the camera 5.
- the data processing device 6 collects the luminescence image and the chip position obtained from the stage 2.
- the data processing device 6 may collect the emission image captured by the camera 5 and the chip position obtained from the stage 2 via the test device 1 and the network 10. Naturally, the data processing device 6 can also acquire the voltage and the signal applied from the tester 1 to the measured wafer 3 via the probe 5.
- the chip position is the coordinates (Xn, Yn) of the chip to be measured based on a predetermined coordinate system in the wafer to be measured 3 as shown in FIG.
- X n and Y n are integers.
- Wx indicates the width of the chip 20 in the X direction
- Wy indicates the width of the chip 20 in the y direction.
- the coordinates of the light emitting point in the chip 20 are indicated by (Xc, Yc).
- the light emission image is sent from the camera 5 to the data processing device 6, and from the test 1 the kind of the wafer 3 to be measured, the lot number, the measurement condition, the measurement date and time, the measurement device information, the work User information (these are hereinafter referred to as measurement information) are sent to the data processing device 6.
- the information collected by the data processing device 6 is stored in the data storage device (storage device) 7 in a format as shown in FIG. 3, for example.
- the storage location 31 of the luminescence image and the measurement information 32 are stored in pairs.
- the measurement information 32 of the luminescence image is composed of the type of semiconductor device 3, the lot number, the measurement condition, the measurement date and time, the measurement device information, the worker information, and the like.
- the luminescence image storage location 31 the number of measurement chips is repeated, and the chip positions 1 to n correspond to the luminescence image storage locations I 1 to In.
- the light emitting point is not necessarily a point, but a wide area. In some cases, in either case, it is simply called a light emitting point.
- the data processing device 6 calculates the coordinates (Xc, Yc) of the light-emitting point from the light-emitting images stored in the light-emitting image storage locations I1 to In for each chip 1 to n. By comparing the obtained coordinates of the light emitting point with the design information on the chip, it is possible to determine in which area of the memory, logic, pad, etc. the light emitting point is generated within the chip. The determined region information is stored in the storage device 7 together with the coordinates (Xc, Yc) of the light emitting point.
- the data processing device 6 obtains the luminescence images stored in each of the chips 1 to n in the luminescence image storage locations I1 to In in step S41, and then in step S42n For example, contour processing is performed on the basis of information (W x, W y) relating to the chip 20, and peripheral portions are cut off.
- step S43 the data processing device 6 compares the reference image composed of the background image with no light-emitting point with the light-emitting image to extract, for example, a difference image, and performs predetermined processing on the extracted difference image.
- the light emitting point which is a difference is extracted by multiplying and determining by multiplying by the threshold value.
- step S44 the coordinates of the light emitting point which is the difference on the light emitting image are recognized.
- step S45 the data processing device 6 converts the coordinates of the light emitting point, which is a difference on the light emitting image, into the coordinates (Xc, Yc) on the real chip. Like this The coordinates (Xc, Yc) within the chip of the light emitting point are obtained.
- the data processing unit 6 calculates the coordinates (X c, Y c) of the obtained light emitting point in the chip and the design information in the chip 20 (the memory area, the logic area, and the By comparing this with the design information on the area of the light-emitting area, it is determined in which area the light-emitting point emits light, and the information on that area and the coordinates (Xc, Yc) of the light-emitting point in the chip are determined.
- the data can be obtained and stored in the data storage device 7.
- Isolated refers to a single light emitting area without other light emitting points in the vicinity. In some cases, it is not just a point, but rather broad. Although there are several possible causes of isolated light emission, it is thought that in semiconductor devices such as system LSIs, gate breakdown and oxide film leakage due to crystal defects occur in isolation.
- Dense refers to the case where several light emitting points are concentrated in the vicinity.
- the neighborhood is specified by a parameter having a certain degree of arbitrariness.
- the neighborhood may be determined within a radius of 1 mm from the center of the light emitting point.
- the broken line shape means that the light emitting points are arranged linearly and intermittently. Periods appear to be isolated points at first glance, but when viewed over the entire chip, they are arranged in a line at almost equal intervals. These are the cases where a semiconductor device such as a system LSI has some similar circuits at the branch destination. This can be seen, for example, when the road is emitting light all at once.
- the branch destination circuits are arranged at substantially equal intervals, it looks like periodic light emission, otherwise, it looks like broken line light emission. Therefore, it is not necessary to distinguish between the broken-line light emission and the periodic light emission. '
- the linear shape means that the light emitting points are continuously arranged in a straight line. This is seen in a semiconductor device such as a system LSI when the transistors malfunction, such as an abnormal input voltage to a particular transistor row.
- the light emitting modes according to the present invention are classified and defined according to the method of arranging the light emitting points.
- the light emission modes classified and defined according to the arrangement of the light emission points are further changed to the light emission locations (for example, the memory section in the chip 20) as shown in FIG. , Mouth.sick part, and pad part). That is, in the case of a system LSI or the like, a chip area includes a memory area, a logic area, and a pad area, and coordinates (X) at which a light emitting point is generated based on design information. c, Y c) can be known.
- the location (area) where light is emitted is determined by the manufacturing method and circuit structure, such as the difference in the manufacturing process and the wiring interval between the memory and logic parts. However, it differs for each circuit block, that is, for each region where those circuit blocks exist. Therefore, if only a specific circuit block appears in the light emitting region, it can be determined that there is a problem in the circuit block's unique manufacturing process (manufacturing process) or circuit structure.
- the data processing device 6 fetches the luminescence images stored in each of the chips 1 to n into the luminescence image storage locations I 1 to In (Step S71), and then, as in Step S43.
- a difference image between the captured luminescence image and a reference image composed of a background image having no luminescence point prepared in advance is extracted by a difference image extraction circuit (not shown), and the extracted difference image is determined.
- a circuit (not shown) makes a judgment with a predetermined threshold, and extracts a light emitting point (step S72).
- a shape parameter for example, the aspect ratio of each light emitting point
- the coordinates of the center of gravity of each light emitting point are calculated (step S74).
- the data processing device 6 determines whether or not there is a light-emitting point to be processed for each chip based on the barycentric coordinates of each light-emitting point calculated for each chip (step S75). . If there is no light emitting point to be processed for each chip, the process is terminated.
- the overnight processing device 6 performs the following processing.
- the data processing device 6 selects one of the light-emitting points to be processed, and determines whether or not the light-emitting points are arranged in a straight line with other light-emitting points (step S76). If they are arranged in a straight line, it is determined whether they are approximately equally spaced (step S77). If the intervals are equal, it is determined that the cycle is a cycle, a group identifier of the cycle that is common to the light emitting point group of the corresponding cycle is assigned, and stored together with the coordinate sequence of the light emitting point group in the data storage device 7 (step S78).
- the data processing device 6 determines that the light-emitting point group is a dashed line, assigns a common dashed group identifier to the corresponding dashed light-emitting point group, and provides a data storage device 7 together with a coordinate sequence of the luminescent point group. (Step S79). Next, a case where it is determined in step S76 that the shape is not linear will be described. I do. First, the data processing device 6 determines whether there is another light-emitting point near the specific light-emitting point (denseness) (Step S80).
- step S81 If another light emitting point exists, it is determined that the light emitting point is dense, a common group identifier is assigned to the light emitting point group, and the data is stored in the data storage device 7 together with the coordinate sequence of the light emitting point group (step S81). If it is determined that there is no light-emitting table in the vicinity, it is determined whether or not it is linear (step S82). If it is linear, a linear group identifier is assigned to the light-emitting point alone and stored in the data storage device 7 together with the coordinate sequence of the light-emitting point group (step S83). If not, it is recognized as isolated, and an isolated group identifier is assigned to the light emitting point alone, and stored in the data storage device 7 together with the coordinate sequence of the light emitting point group (step S84).
- step S85 the light emitting point to which the group identifier is assigned is excluded from the light emitting points to be processed. Then, the processing from step S75 is repeated.
- the data processing device 6 classifies the light-emitting points into four light-emitting modes: periodic and broken, dense, linear, and isolated according to the definition shown in FIG. 5 described above.
- a group identifier is assigned to the data and stored in the data storage device 7 together with the coordinates. It is convenient and convenient to assign a series of integer values to the group identifier.
- the semiconductor device 3 such as a system LSI is classified as isolated, it can be analyzed that gate breakdown or oxide film leak due to crystal defects is isolated, and if the semiconductor device 3 is classified densely, It can be analyzed that the leakage of the oxide film spreads over a certain range, etc., and if it is classified into a period and a broken line, it is possible to have some similar circuits at the branch destination, and just before the branch It can be analyzed that there is an abnormality in the wiring, and if the wiring is classified, it can be analyzed that those transistors are malfunctioning, such as an abnormality in the input voltage to a specific transistor array.
- individual recognition algorithms will be described.
- step S76 As a method of recognizing the linearity in step S76, a method called Hough (Hough) transformation based on the barycentric coordinates of each light emitting point calculated in step S74 is known. This is already widely known and its explanation is omitted (References: Image Recognition Theory Makoto Nagao, Corona Publishing Co., Ltd., pp. 72-74).
- the following algorithm can be considered for the recognition of the uniformity in step S77.
- the light-emitting points arranged in a straight line are parallel to the X-axis or the Y-axis.
- a light emitting point sequence in the X direction will be described as an example. The same applies to the Y direction. '
- the difference d (i) x (with respect to the barycentric coordinates, X (1), X (2), X (3) to x (n) of the target n light emitting point sequences calculated in step S74. i + 1)-x (i) is defined.
- the standard deviation S G is calculated with respect to d (i).
- SG / lx (n) -lx (1) 1 is calculated, and if this value is substantially equal to or less than a fixed value, it is determined that the intervals are equal. This fixed value may be determined to be, for example, 0.001.
- step S80 the determination of the density in step S80 will be described.
- This radius may be set to 1 mm, for example.
- the data processing device 6 classifies the luminous points into four types: periodic, broken line, dense, linear, and isolated, according to the definition shown in FIG.
- the storage of the data storage device 7 after subdividing the area such as the storage section will be described. That is, regarding the memory unit, the logic unit, and the area of the pad unit in the chip 20 of the semiconductor device 3, for example, a CAD system (not shown) may be used as design information in advance from a CAD system (not shown).
- the data is input to the tester 1 via the network 10 and stored in, for example, the data storage 7. Therefore, as described above, step S shown in FIG.
- step 6 by comparing the converted coordinates of the light emitting point on the real chip with the area data stored in, for example, the data storage device 7, it is possible to know in which area the light emitting point occurred. The result can be registered in the data storage device 7.
- step S75 shown in FIG. 7 by comparing the barycentric coordinates of each light emitting point calculated in step S74 with the above-mentioned area data in each chip stored in the data storage device 7, for example, It is possible to detect in which region each light emitting point exists.
- the determination from 576 to S84 may be performed for each of the above areas.
- the recognition of linearity, equidistantness, and denseness is not performed across different definition areas.
- the area of the circuit block that emits light can be specified, it is possible to determine that there is a problem in the manufacturing process (manufacturing process) or circuit structure unique to the circuit block.
- the output of the measurement information, the emission image, and the emission mode classification result stored in the data storage device 7 will be described. That is, as shown in Fig. 3, the measurement information 32 such as the type name, lot number, and wafer number of the wafer to be measured 32, the emission image 31 corresponding to the chip position, and the emission mode classification result are The data is input to the device 6 and stored in the data storage device 7. Therefore, if you want to know the result of the data processing of the measured wafer or chip, you need to input the model name, lot number, wafer number, etc. of the wafer to be measured to the data processor 6. By inputting using the input device 9 composed of the same, the output can be made to the output device 8 in a format as shown in FIGS. 8, 10, 11, and 12.
- the format in the first embodiment includes a column 51 indicating a product name, a slot number, and a wafer number, a column 52 indicating a measurement date, an operator, a measuring device, etc., a column 53 indicating a measurement condition, and a column 53 indicating a measurement condition.
- Column 54 indicating the class name
- column 55 indicating the number of light emitting modes on the top of each category
- column 56 indicating the position of each chip in the wafer, and the number of occurrences for each light emitting mode of each chip
- Columns 5-7 indicating a product name, a slot number, and a wafer number
- the classification name (period classified by region and four light emission modes of dashed, dense, linear, and isolated) 5 4
- the number of occurrences 5 over the wafer to be measured 5 and the number of occurrences 5 per chip 5 7 can be displayed and output. Therefore, the operator can grasp the number of light-emitting modes generated for each region over the entire wafer to be measured and for each chip.
- Specific output devices 8 include printers and CRTs, but when displaying on a CRT, the columns 56 and 57 become long horizontally, so if you have a so-called scroll function, operations will be difficult. .
- the format shown in FIG. 8 is merely an example, and some information may be added and displayed, or may be deleted and displayed easily. Also, it is stated that the data processing device 6 obtains the data processing result by inputting the type name, lot number, wafer number, etc. of the wafer to be measured. May be output.
- the association between the classification name 6 1 indicated by the light emission mode for each area and the cause of failure 6 2 can be stored in the storage unit 7 in advance.
- the defect cause 61 corresponding to the classification name 61 with a particularly large number of occurrences obtained from the output format shown in FIG. 8 using the output device 8 as shown in FIG. 6 1 can be grasped, which can be used for failure cause analysis.
- This second embodiment is a display in which a so-called map display 71 and a light emission mode classification 72 including measurement information 73 are combined.
- the position of the corresponding chip (Xn, Yn) and the coordinates (Xc, Yc) in the chip are known. Therefore, if the data processing device 6 uses the chip size (Wx, Wy) stored in the data storage device 7, the coordinates (Xw, Yw) in the wafer can be expressed by the following formula (1). It can be easily calculated based on the above.
- the chip size (Wx, Wy) is stored and managed in the data storage device 7 for each product type.
- the data processing device 6 indicates the distribution of the light emitting points on the wafer by plotting the coordinates (Xw, Yw) calculated for each light emitting point.
- An emission map 71 can be created and displayed on the CRT 8 as shown in FIG. Fig. 10 shows a display example.
- a light emission map 71 indicating the distribution of light emission points on a wafer, a light emission mode classification result 72 for the wafer, and a measurement condition 73 for the wafer are arranged on an output screen or the like so that they can be referred to each other.
- the emission map 71, the emission mode classification result 72, and the measurement condition 73 can be displayed using separate windows. If necessary, the display / non-display of the relevant information and the display location Operability is good because it can be moved.
- the data processing device 6 As shown in FIG. 7, the luminescence image 83 of the chip 81 can be displayed on the CRT 8. Also, at this time, if the light emission mode classification result 82 of only the chip concerned is displayed, only the information of the chip of interest can be narrowed down, so that the operability is good.
- the operator specifies a specific light emission mode on the screen shown in FIG. 10 so that the data processing device 6 has a mode extraction function. Extract from enclosure 7 Display on CRT 8.
- the distribution of isolated point defects in the logic portion on the wafer is almost uniformly distributed on the wafer as shown in FIG. If the distribution on the wafer is concentrated in the periphery of the wafer as shown in Fig. 12 (b), it can be determined that the causes of these defects in the manufacturing process are different, and Management can plan different measures separately.
- the light emitting points are concentrated on a specific area of the wafer, it can be determined that the wafer processing is uneven in the plane. For example, as shown in FIG.
- the data processor 6 focuses on quality control items such as film thickness and foreign matter density around the wafer, and Items that differ from the central portion of the inner wafer are checked, and the checked items can be output as candidates for the cause of failure.
- the examination of the item having a difference from the central portion of the wafer may be performed by displaying the above-mentioned quality control item on the CRT 8.
- the film thickness at the peripheral portion of the wafer is measured by a film thickness measuring device (not shown). For example, the film thickness is input to the data processing device 6 via the network 10 and stored in the data storage device 7. Good.
- the foreign matter density around the periphery of the wafer may be inspected by a foreign matter inspection device (not shown), and input to the data processing device 6 via the network 10, for example, and stored in the data storage device 7. .
- a foreign matter inspection device not shown
- acquiring information on the area of a defect, such as where the light emitting point is concentrated on the wafer, is effective in taking measures against the defect.
- the data processing device 6 checks the number of chips having each light emitting point for each of the classified light emitting modes, and outputs the result using the output device 8, thereby affecting the yield of each light emitting mode on the yield. Can be known. At this time, the data processing device 6 may calculate the yield for each light emission mode, and output the calculation result using the output device 8. As described above, outputting the number of chips having light-emitting points for each light-emitting mode and the yield thereof provides a guideline for prioritizing countermeasures. It becomes possible. Usually, in the light emitting mode, the one with the larger number of chips having light emitting points (the one with a lower yield) is given priority and the countermeasure is implemented.
- the light emission mode extraction function allows the data processing device 6 to compare the distribution of occurrence of a specific light emission mode obtained by imaging with the camera 5 the wafer 3 to be measured before and after the countermeasure, and for example, generate a difference image
- the effectiveness of the countermeasures can be confirmed by extracting and displaying the comparison results on, for example, CRT 8.
- the occurrence distribution of a specific light emission mode obtained from the wafer under measurement 3 before and after the countermeasure may be output to the CRT 8 and displayed as it is.
- an electrical characteristic test usually called a probe test is performed.
- a wafer having a low yield is extracted by evaluating the yield in the wafer processing step.
- the extracted wafers with a low yield are subjected to the above-described light emission mode classification and analysis system.
- the classification name the emission mode classified for each area
- the cause of failure can be determined.
- the failure cause 62 corresponding to the classification name 61 is displayed, it is possible to easily find the cause of the failure.
- the data processing device 6 is connected to a production line management device (not shown) that manages the entire production line and a visual inspection device (not shown) including a foreign substance inspection device via, for example, a network 10.
- a production line management device (not shown) that manages the entire production line
- a visual inspection device (not shown) including a foreign substance inspection device via, for example, a network 10.
- manufacturing process conditions and circuit structure conditions Using the wafer number, product name, and lot number based on the above measurement information as keys, manufacturing process conditions and circuit structure conditions And search the manufacturing process conditions and circuit structure conditions for the circuit block with the light-emitting point and the manufacturing process conditions and circuit structure condition for the circuit block without the light-emitting point.
- the cause of the failure can be narrowed down.
- the circuit structure condition may be an actually measured wiring width, a wiring interval, a thickness of an absolutely green film, or the like. It can also be measured by processing and observing the cross section after it is almost completed.
- the data processing device 6 checks the relevant circuit structure conditions and the manufacturing process conditions from, for example, the network 10 from the visual inspection device including the manufacturing line management device and the foreign material inspection device.
- the production line manager checks the data and displays the data on the CRT 8 to determine the cause of the failure. For example, there is no room for the space between circuit patterns, and there is no foreign matter on the wiring.
- the production line manager takes countermeasures based on the determined cause of the defect, which is the result of the check. Correct the mask if it is due to the circuit pattern. If it is caused by foreign matter, take measures such as sweeping etc. for the processing equipment that processed the wiring layer. The emission mode classification and analysis system will be applied again to the mouth that has taken such measures. Here, if the appearance frequency of the dashed light emission mode around the pad is reduced, it can be confirmed that the countermeasure was effective. If the frequency of occurrence of the light-emitting mode has not decreased, it means that the countermeasure was not effective and the cause of the failure is investigated again. Need to be
- the cause of the failure can be analyzed for each light emitting mode. This makes the cause analysis more efficient. Furthermore, by comparing the frequency of appearance before and after the search for each emission mode classification, the effectiveness of the countermeasure can be easily confirmed.
- the inspection is performed by a foreign substance inspection device inspected by a foreign substance inspection apparatus in a semiconductor manufacturing process (semiconductor manufacturing line) or by an external inspection apparatus (including an optical external inspection apparatus and an SEM external inspection apparatus).
- This is a method of comparing the appearance inspection result with the emission mode classification result.
- a foreign material since a defective portion does not always emit light, a special device is required to match a foreign material or a poor appearance (hereinafter simply referred to as a foreign material) with a light emitting portion.
- the data processing device 6 divides the inside of the chip into, for example, a memory section, a logic section, and a pad section, and correlates the number of foreign particles attached to each area with the light emission mode of the corresponding area. Is to output a correlation diagram (graph) for analyzing to a CRT 8 and display it.
- the number of foreign substances adhering to each area in a certain manufacturing process is determined by the overnight processing apparatus 6 from a foreign substance inspection apparatus (not shown) or a visual inspection apparatus.
- the data processing device 6 may obtain a foreign material inspection result indicated by coordinate data of the foreign material obtained from the foreign material inspection device or the visual inspection device via, for example, the network 10.
- the data processing device 6 outputs the correlation diagram to the CRT 8 so that the region defined in the preceding chip in the horizontal direction can be vertically arranged in a matrix in a light-emitting mode for each light emission mode.
- the data processing device 6 acquires the foreign substance inspection result for each manufacturing process from the foreign object inspection device or the visual inspection device via, for example, the network 10, the above analysis can be repeated for each manufacturing process step. It becomes possible. As a result, the data processing device 6 outputs the analysis results repeated for each manufacturing process step to a CRT 8, etc., and displays it. It is possible to know in which part the foreign matter has occurred. This makes it possible to implement a concrete defect countermeasure such as giving priority to a countermeasure for foreign matter in the process.
- this embodiment is a method of observing from the substrate side on the back surface in order to make it easier to detect the luminescence generated in the lower layer of the wafer 3 to be measured when the luminescence image is acquired by the camera 5.
- the reason for observing the emission image from the substrate side on the back side is that light emitted in the lower layer of the wafer under test 3 is blocked by the multilayer wiring layer formed thereon. This makes it difficult to observe the luminescence image from the front side. Further, if the substrate on the back side is processed to be thin, it becomes easier to observe the luminescent image emitted from the lower layer from the back side.
- the data processing device 6 inverts the coordinate data of the emission point to a mirror image (in the X direction or the y direction) as shown in FIG. It is necessary to reverse either one of them. By doing so, it is possible to collate the distribution of foreign matter attached to the top surface of the measured wafer during the manufacturing process with the distribution of light emitting points measured from the back surface side. Conversely, even if the coordinate data of the foreign substance distribution is mirror-inverted, it is possible to match the distribution of the light emitting points.
- the position where the foreign matter adheres is related to the arrangement of the jig or the like of the manufacturing apparatus.
- the coordinate data of the foreign matter is mirror-inverted, it becomes difficult to grasp the correspondence between the position where the foreign matter is attached and the layout of the jig arm in the manufacturing apparatus.
- the method described above is based on the shape of the light emitting point and its position information.
- a classification scale based on optical information of the light emitting point is further added.
- the optical information is a light emission intensity, a light emission spectrum, and the like detected by a detection optical system such as the camera 5.
- the luminous intensity includes a peak luminous intensity detected by a pixel at each luminous point, a total luminous intensity which is a sum of the luminous intensity of each pixel, and the like. It is also possible to characterize the light emission spectrum of each light emission point by a peak position, its half-value width, and the like, and refine the classification based on these characteristics.
- a light emitting mode is set for each LSI chip and / or for a circuit based on an arrangement state of light emitting points.
- the cause analysis of the failure and the measures for the failure are performed for each light emitting mode and for the LSI chip. And, by performing it for each Z or circuit block, the yield can be improved quickly. Also, by using a graphical user interface for output, work efficiency can be improved.
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Health & Medical Sciences (AREA)
- Computer Vision & Pattern Recognition (AREA)
- Computer Hardware Design (AREA)
- Toxicology (AREA)
- General Engineering & Computer Science (AREA)
- General Physics & Mathematics (AREA)
- Testing Or Measuring Of Semiconductors Or The Like (AREA)
- Measuring Leads Or Probes (AREA)
- Tests Of Electronic Circuits (AREA)
Description
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JP5087236B2 (ja) | 2006-06-14 | 2012-12-05 | ã«ããµã¹ãšã¬ã¯ãããã¯ã¹æ ªåŒäŒç€Ÿ | åå°äœäžè¯è§£æè£ çœ®ãäžè¯è§£ææ¹æ³ãåã³äžè¯è§£æããã°ã©ã |
JP4931483B2 (ja) | 2006-06-14 | 2012-05-16 | ã«ããµã¹ãšã¬ã¯ãããã¯ã¹æ ªåŒäŒç€Ÿ | åå°äœäžè¯è§£æè£ çœ®ãäžè¯è§£ææ¹æ³ãåã³äžè¯è§£æããã°ã©ã |
KR101327857B1 (ko) * | 2007-02-26 | 2013-11-12 | ìì§ëì€íë ìŽ ì£Œìíì¬ | íìì¥ì¹ì ë¶ë ìž¡ì ì¥ì¹ ë° ë°©ë² |
US9075106B2 (en) | 2009-07-30 | 2015-07-07 | International Business Machines Corporation | Detecting chip alterations with light emission |
US8312413B2 (en) | 2010-01-22 | 2012-11-13 | International Business Machines Corporation | Navigating analytical tools using layout software |
JP2013120075A (ja) * | 2011-12-06 | 2013-06-17 | Mitsubishi Electric Corp | æ é解æè£ çœ®ããã³æ é解ææ¹æ³ãªãã³ã«ã¹ã¯ãªãŒãã³ã°ãã¹ãè£ çœ®ããã³ã¹ã¯ãªãŒãã³ã°ãã¹ãæ¹æ³ |
JP2015175851A (ja) * | 2014-03-13 | 2015-10-05 | ãã£ãŒã·ãŒãžãŒ ã·ã¹ãã ãºã ã€ã³ã³ãŒãã©ã€ãããïœïœ ïœïœïœïœ ïœïœ ïœïœïŒ | çºå ã¹ãã¯ãã«åæã«ããæ¬ é¥ã®åé¢ã®ããã®ã·ã¹ãã ãšæ¹æ³ |
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JPH11352073A (ja) * | 1998-06-11 | 1999-12-24 | Hitachi Ltd | ç°ç©æ€æ»æ¹æ³ããã³è£ 眮 |
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