WO2010029618A1 - メモリデバイス、メモリデバイスの製造方法、およびデータ書込方法 - Google Patents
メモリデバイス、メモリデバイスの製造方法、およびデータ書込方法 Download PDFInfo
- Publication number
- WO2010029618A1 WO2010029618A1 PCT/JP2008/066350 JP2008066350W WO2010029618A1 WO 2010029618 A1 WO2010029618 A1 WO 2010029618A1 JP 2008066350 W JP2008066350 W JP 2008066350W WO 2010029618 A1 WO2010029618 A1 WO 2010029618A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- floating electrode
- data
- insulating film
- memory device
- electron beam
- Prior art date
Links
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 29
- 238000000034 method Methods 0.000 title claims abstract description 18
- 238000010894 electron beam technology Methods 0.000 claims abstract description 49
- 239000004065 semiconductor Substances 0.000 claims abstract description 35
- 239000000758 substrate Substances 0.000 claims abstract description 33
- 230000001678 irradiating effect Effects 0.000 claims abstract description 19
- 238000001514 detection method Methods 0.000 claims description 12
- 239000004020 conductor Substances 0.000 claims description 5
- 238000010030 laminating Methods 0.000 claims description 3
- 239000000463 material Substances 0.000 claims description 3
- 230000000149 penetrating effect Effects 0.000 claims 3
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 6
- 238000005530 etching Methods 0.000 description 6
- 108090000699 N-Type Calcium Channels Proteins 0.000 description 5
- 102000004129 N-Type Calcium Channels Human genes 0.000 description 5
- 238000002955 isolation Methods 0.000 description 5
- 238000000151 deposition Methods 0.000 description 4
- 239000011810 insulating material Substances 0.000 description 3
- 150000002500 ions Chemical class 0.000 description 3
- 239000007769 metal material Substances 0.000 description 3
- 230000002093 peripheral effect Effects 0.000 description 3
- 229910052698 phosphorus Inorganic materials 0.000 description 3
- 239000011574 phosphorus Substances 0.000 description 3
- -1 phosphorus ions Chemical class 0.000 description 3
- 235000012239 silicon dioxide Nutrition 0.000 description 3
- 239000000377 silicon dioxide Substances 0.000 description 3
- 239000002344 surface layer Substances 0.000 description 3
- 108010075750 P-Type Calcium Channels Proteins 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 239000010410 layer Substances 0.000 description 2
- 229910044991 metal oxide Inorganic materials 0.000 description 2
- 150000004706 metal oxides Chemical class 0.000 description 2
- 229910021421 monocrystalline silicon Inorganic materials 0.000 description 2
- 230000001590 oxidative effect Effects 0.000 description 2
- 229910021420 polycrystalline silicon Inorganic materials 0.000 description 2
- 229920005591 polysilicon Polymers 0.000 description 2
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 description 1
- 229910052796 boron Inorganic materials 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000006870 function Effects 0.000 description 1
- 239000002784 hot electron Substances 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000004806 packaging method and process Methods 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
Images
Classifications
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11C—STATIC STORES
- G11C13/00—Digital stores characterised by the use of storage elements not covered by groups G11C11/00, G11C23/00, or G11C25/00
- G11C13/04—Digital stores characterised by the use of storage elements not covered by groups G11C11/00, G11C23/00, or G11C25/00 using optical elements ; using other beam accessed elements, e.g. electron or ion beam
- G11C13/042—Digital stores characterised by the use of storage elements not covered by groups G11C11/00, G11C23/00, or G11C25/00 using optical elements ; using other beam accessed elements, e.g. electron or ion beam using information stored in the form of interference pattern
- G11C13/044—Digital stores characterised by the use of storage elements not covered by groups G11C11/00, G11C23/00, or G11C25/00 using optical elements ; using other beam accessed elements, e.g. electron or ion beam using information stored in the form of interference pattern using electro-optical elements
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L29/00—Semiconductor devices specially adapted for rectifying, amplifying, oscillating or switching and having potential barriers; Capacitors or resistors having potential barriers, e.g. a PN-junction depletion layer or carrier concentration layer; Details of semiconductor bodies or of electrodes thereof ; Multistep manufacturing processes therefor
- H01L29/40—Electrodes ; Multistep manufacturing processes therefor
- H01L29/401—Multistep manufacturing processes
- H01L29/4011—Multistep manufacturing processes for data storage electrodes
- H01L29/40114—Multistep manufacturing processes for data storage electrodes the electrodes comprising a conductor-insulator-conductor-insulator-semiconductor structure
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10B—ELECTRONIC MEMORY DEVICES
- H10B41/00—Electrically erasable-and-programmable ROM [EEPROM] devices comprising floating gates
- H10B41/10—Electrically erasable-and-programmable ROM [EEPROM] devices comprising floating gates characterised by the top-view layout
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10B—ELECTRONIC MEMORY DEVICES
- H10B41/00—Electrically erasable-and-programmable ROM [EEPROM] devices comprising floating gates
- H10B41/30—Electrically erasable-and-programmable ROM [EEPROM] devices comprising floating gates characterised by the memory core region
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10B—ELECTRONIC MEMORY DEVICES
- H10B41/00—Electrically erasable-and-programmable ROM [EEPROM] devices comprising floating gates
- H10B41/30—Electrically erasable-and-programmable ROM [EEPROM] devices comprising floating gates characterised by the memory core region
- H10B41/35—Electrically erasable-and-programmable ROM [EEPROM] devices comprising floating gates characterised by the memory core region with a cell select transistor, e.g. NAND
Definitions
- the present invention relates to a memory device, a memory device manufacturing method, and a data writing method.
- a memory device using a metal oxide semiconductor (MOS) is known (for example, see Patent Document 1).
- MOS metal oxide semiconductor
- a typical example is a flash EPROM in which a plurality of memory cells are formed which can hold data written by a write operation and erase data held by an erase operation.
- the memory cell has, for example, a source and drain region and a control gate and an electrically insulated floating gate, and stores the data by storing data written by the user as electric charges in the floating gate. can do.
- JP-A-6-215587 JP-A-6-215587
- an object of the present invention is to provide a memory device, a memory device manufacturing method, and a data writing method that can solve the above-described problems. This object is achieved by a combination of features described in the independent claims.
- the dependent claims define further advantageous specific examples of the present invention.
- a memory device is provided so as to be capable of being irradiated with an electron beam and stores data, and charges are accumulated by being irradiated with the electron beam.
- a memory device is provided that includes a plurality of floating electrodes and a charge amount detection unit that detects the amount of charge accumulated in each of the floating electrodes.
- a method for manufacturing a memory device for storing written data wherein the floating electrode is formed on a semiconductor substrate, and the floating electrode is irradiated with an electron beam for writing.
- a manufacturing method is provided in which electric charges corresponding to power data are held in a floating electrode.
- a data writing method for writing the data to a memory device that stores the data by holding a charge corresponding to the data to be stored in the floating electrode.
- a data writing method for irradiating the floating electrode with an electron beam according to the data to be provided is provided.
- FIG. 1 shows a configuration example of a memory device 10 according to an embodiment of the present invention.
- 3 is a top view of the memory cell 100-1.
- FIG. FIG. 3 is a cross-sectional view taken along a line AA ′ in FIG.
- a cross-sectional view of the memory cell 100-1 in the manufacturing process of the memory cell 100-1 is shown.
- a cross-sectional view of the memory cell 100-1 in the manufacturing process of the memory cell 100-1 is shown.
- a cross-sectional view of the memory cell 100-1 in the manufacturing process of the memory cell 100-1 is shown.
- a cross-sectional view of the memory cell 100-1 in the manufacturing process of the memory cell 100-1 is shown.
- a cross-sectional view of the memory cell 100-1 in the manufacturing process of the memory cell 100-1 is shown.
- FIG. 10 is a cross-sectional view showing another configuration example of the memory cell 100-1.
- FIG. 10 is a cross-sectional view showing still another configuration example of the memory cell 100-1.
- FIG. 10 is a cross-sectional view showing still another configuration example of the memory cell 100-1.
- DESCRIPTION OF SYMBOLS 10 ... Memory device, 20 ... Read-out control part, 30 ... Row address designation part, 40 ... Column address designation part, 100 ... Memory cell, 101 ... Memory transistor, 102 ... Read control transistor, 110 ... semiconductor substrate, 111, 112 ... source region, 113, 114 ... drain region, 115 ... isolation region, 121, 122, 123 ... insulating film, 131 ..Floating electrode 132 ... Control electrode 151,152 ... Via, 161,162,163,164,165 ... Pattern wiring, 171,172 ... Guard ring, 181 ... Source terminal 183 ... Drain terminal, 184 ... Guard terminal, 185 ... Control terminal, 191 ... Through hole, 200 ... Kkeji part
- FIG. 1 shows a configuration example of a memory device 10 according to an embodiment of the present invention.
- the memory device 10 includes a read control unit 20, a row address designating unit 30, a column address designating unit 40, and a plurality of memory cells 100 (100-1, 100-2,).
- the plurality of memory cells 100 each have a memory transistor and a read control transistor.
- the memory cell 100-1 includes a memory transistor 101 and a read control transistor 102.
- the control terminal of the read control transistor is connected to the row address designating unit 30 by any one of a plurality of word lines WL (WL-1, WL-2,).
- the control electrode 132 of the read control transistor 102 is connected to the row address specifying unit 30 through the word line WL-1.
- the drain terminal of the read control transistor is connected to the column address specifying unit 40 by any one of a plurality of bit lines BL (BL-1, BL-2,).
- the drain terminal of the read control transistor 102 is connected to the column address specifying unit 40 via the bit line BL-1.
- the source terminal of the memory transistor is connected to one of a plurality of source lines SL (SL-1, SL-2,...) Connected to a common reference potential.
- the source terminal of the memory transistor 101 is connected to the reference potential via the source line SL-1.
- the plurality of source lines SL may be connected to the ground potential via, for example, the GND terminal of the memory device 10.
- the floating electrode 131 of the memory transistor is in a floating state that is not connected to an external wiring or the like.
- the control electrode 132 of the memory transistor 101 is not electrically connected to either the source side or the drain side of the memory transistor 101, and a plurality of bit lines BL and word lines are connected. It is not electrically connected to any of WL.
- the plurality of memory cells 100 data is written by storing electric charges in the floating electrodes of the memory transistors included therein, and the data can be stored. That is, the plurality of memory cells 100 can hold data in a nonvolatile manner by utilizing the fact that the potential difference between the source and the drain differs depending on whether or not charges are accumulated in the floating electrodes of the memory transistors included in each of the memory cells 100. .
- Data writing to each of the plurality of memory cells 100 is performed by irradiating an electron beam to the floating electrode of each memory transistor. That is, by irradiating the floating electrode of the memory transistor of the memory cell 100 to which data is to be written with an electron beam using, for example, an electron beam irradiation device, charges are accumulated in the floating electrode of the memory transistor. Thereby, data can be stored in the memory cell 100.
- the electron beam irradiation to the memory transistor may be performed simultaneously on the memory transistors of the plurality of memory cells 100 to which data is to be written, or may be performed while individually adjusting the irradiation amount.
- the memory transistor may function as a charge amount detection unit that detects data stored in the floating electrode based on the charge amount accumulated in the floating electrode.
- the memory transistor detects binary data stored in the floating electrode by using the floating electrode as a gate terminal and turning on or off according to the amount of charge accumulated in the floating electrode.
- the memory transistor may detect multi-value data stored in the floating electrode by flowing a current corresponding to the amount of charge accumulated in the floating electrode.
- the floating electrode of the memory transistor included in each memory cell 100 can accumulate electric charge according to the amount of electron beam irradiation to the memory transistor. Therefore, multi-value data can be stored in the memory transistor of each memory cell 100 by irradiating the electron beam with an irradiation amount corresponding to data to be written.
- the irradiation amount of the electron beam may be determined based on, for example, the intensity of the electron beam and the irradiation time.
- Data written to the memory transistor of the memory cell 100 can be read by operating the read control transistor of the memory cell 100 in a predetermined manner. For example, when reading data written in the memory transistor 101 of the memory cell 100-1, the read control unit 20 reads the read control transistor of the memory cell 100-1 from the row address designating unit 30 and the column address designating unit 40. A control signal for giving a predetermined voltage is sent to 102.
- the row address designating unit 30 and the column address designating unit 40 apply a predetermined voltage to the control electrode 132 and the drain terminal of the read control transistor 102 in accordance with a control signal from the read control unit 20, respectively.
- the control transistor 102 is turned on.
- the memory cell 100-1 has a current corresponding to the value of data written in the memory transistor 101, that is, a current corresponding to the amount of charge accumulated in the floating electrode 131 of the memory transistor 101. Current flows.
- the read control unit 20 detects the current flowing through the memory cell 100-1 when the read control transistor 102 is turned on.
- the read control unit 20 includes a current detection unit such as a sense amplifier, for example.
- a current detection unit such as a sense amplifier, for example.
- a reference of a predetermined magnitude that should be compared with the magnitude of the current detected from the memory cell 100.
- a current value may be preset in the current detection means.
- the read control unit 20 causes the memory transistor 101 of the memory cell 100-1 to have a logic value. It is determined that an H data value has been written. If the magnitude of the current detected from the memory cell 100-1 is smaller than the reference current value, it is determined that a logic L data value has been written in the memory transistor 101 of the memory cell 100-1.
- the read control unit 20 sets a plurality of reference current values of different magnitudes in the current detection means in association with each value of the multi-value data, and determines the magnitude of the current from the memory cell 100-1. It may be determined which value of the multi-value data is written in the memory cell 100-1 by comparison with the magnitude of the reference current value.
- the current detection unit may be electrically connected to, for example, a plurality of bit lines BL and detect a current flowing through the memory cell 100 from which written data is to be read.
- the current detection unit is an example of a charge amount detection unit that detects the amount of charge accumulated in the floating electrode of the memory cell 100, but is not limited to the sense amplifier.
- data written to the memory transistor of the memory cell 100 can be erased by irradiating the floating electrode of the memory transistor with ultraviolet rays. That is, by irradiating the memory cell 100 in which the stored data is to be erased with ultraviolet rays to the floating electrode of the corresponding memory transistor using, for example, an ultraviolet irradiation device or the like, and discharging the charges accumulated in the floating electrode, Data stored in the memory cell 100 can be erased.
- the above erasing operation may be performed on the entire memory device 10, that is, a plurality of memory cells 100, or by using an ultraviolet laser, an ultraviolet lamp, a mask, or the like that can reduce the spot diameter to a minimum.
- the specific memory cell 100 may be implemented by limiting the irradiation site.
- the memory transistor when writing new data to the memory transistor of the memory cell 100 in which data has already been written, the memory transistor should be irradiated with ultraviolet rays to discharge the charge accumulated in the floating electrode of the memory transistor before writing.
- the memory transistor may be irradiated with an electron beam with an irradiation amount corresponding to new data, and a charge corresponding to the data may be newly accumulated in the floating electrode.
- the memory value is first detected by detecting the current value by the current detecting means. A data value corresponding to the amount of charge already stored in the floating electrode of the transistor is determined. Then, the memory transistor is irradiated with an electron beam with an irradiation amount corresponding to the difference in charge amount between the data value stored in the memory transistor and the data value to be newly written.
- the memory transistor when writing data with a charge amount smaller than the charge amount already accumulated in the floating electrode of the memory transistor, the memory transistor is irradiated with ultraviolet rays to discharge the charge accumulated in the floating electrode,
- the memory transistor may be irradiated with an electron beam with an irradiation amount corresponding to new data to be written.
- the memory device 10 can write and store data in a nonvolatile manner by irradiating the memory cell 100 to which data is to be written with an electron beam. Therefore, for each memory cell 100, a wiring for accumulating electric charge with respect to the floating electrode of the memory transistor becomes unnecessary. Further, the memory device 10 can easily read or erase the data written in each memory cell 100 as necessary. Further, the memory device 10 can write data corresponding to the irradiation amount by controlling the irradiation amount of the electron beam to the memory transistor of the memory cell 100.
- FIG. 2 is a top view of the memory cell 100-1.
- 3 is a cross-sectional view taken along the line AA ′ in FIG.
- the memory cell 100-1 includes a semiconductor substrate 110, a memory transistor 101 and a read control transistor 102 provided on the semiconductor substrate 110.
- the memory transistor 101 and the read control transistor 102 may be formed on the semiconductor substrate 110 by a predetermined semiconductor process, for example, and have P-type or N-type channel characteristics. In the following description, it is assumed that both the memory transistor 101 and the read control transistor 102 have N-type channel characteristics.
- the memory transistor 101 is provided in a region partitioned by a plurality of isolation regions 115 formed of an insulating material such as silicon dioxide on the semiconductor substrate 110, and includes a source region 111, a drain region 113, a floating electrode 131, and a via 151. , And a guard ring 171.
- the source region 111 and the drain region 113 are formed in the surface layer portion of the semiconductor substrate 110 so as to be separated from each other.
- the source region 111 and the drain region 113 may be formed, for example, by implanting phosphorus ions from the upper surface of the single crystal silicon semiconductor substrate 110 to a predetermined depth.
- the semiconductor substrate 110 may be a P-type substrate, while the source region 111 and the drain region 113 may be N-type regions.
- the floating electrode 131 is provided to face the source region 111 and the drain region 113 with an insulating film 121 formed by laminating an insulating material such as silicon dioxide on the semiconductor substrate 110.
- the floating electrode 131 may be provided between the source region 111 and the drain region 113 in the surface direction of the semiconductor substrate 110.
- the via 151 is formed of a conductive material, and is provided so as to penetrate from the surface of the insulating film 123 to the floating electrode 131.
- an insulating film 122 and an insulating film 123 in which insulating materials are stacked are formed on the floating electrode 131, and the via 151 is provided through the insulating films 122 and 123, and one end thereof Is exposed on the surface of the insulating film 123.
- the pattern wiring 161 and the pattern wiring 162 are provided between the insulating film 122 and the insulating film 123.
- the pattern wiring 161 electrically connects the source terminal 181 provided on the semiconductor substrate 110 and the source region 111.
- the pattern wiring 162 electrically connects a source region 112 and a drain region 113 of a read control transistor 102 described later.
- the source terminal 181 is connected to the source line SL-1 of the memory device 10 shown in FIG.
- the guard ring 171 is formed of, for example, a conductive metal material, and is provided so as to surround the via 151 on the surface of the insulating film 123.
- the guard ring 171 is electrically connected to the guard terminal 184 connected to the reference potential via the pattern wiring 164.
- the guard ring 171 is not limited to the form formed in the annular
- the guard terminal 184 may be connected to the ground potential via, for example, the GND terminal of the memory device 10.
- the read control transistor 102 is provided in a region partitioned by the isolation region 115, and includes a source region 112, a drain region 114, a control electrode 132, a via 152, and a pattern wiring 165.
- the read control transistor 102 may be provided adjacent to the memory transistor 101 across the isolation region 115 as in this example, but other regions on the semiconductor substrate 110 depending on the arrangement of the memory cells 100 in the memory device 10. May be provided.
- the source region 112 and the drain region 114 are formed in the surface layer portion of the semiconductor substrate 110 so as to be separated from each other. Similarly to the source region 111 and the drain region 113 described above, the source region 112 and the drain region 114 may be formed by implanting phosphorus ions from the upper surface of the semiconductor substrate 110 to a predetermined depth.
- the control electrode 132 is provided to face the source region 112 and the drain region 114 with the insulating film 121 interposed therebetween.
- the control electrode 132 may be provided between the source region 112 and the drain region 114 in the surface direction of the semiconductor substrate 110.
- the via 152 is formed of a conductive material and is provided so as to penetrate from the surface of the insulating film 123 to the control electrode 132 in the same manner as the via 151 described above.
- the pattern wiring 163 is provided between the insulating film 122 and the insulating film 123, and electrically connects the drain terminal 183 and the drain region 114 provided on the semiconductor substrate 110.
- the pattern wiring 165 is provided on the insulating film 123 and electrically connects the control terminal 185 and the via 152.
- the control terminal 185 is connected to the word line WL-1 of the memory device 10 shown in FIG. Therefore, the control electrode 132 is electrically connected to the word line WL-1 via the via 152, the pattern wiring 165, and the control terminal 185.
- the floating electrode 131 is A charge amount corresponding to the irradiation amount is accumulated.
- the magnitude of the current flowing between the source region 111 and the drain region 113 of the memory transistor 101 is such that no charge is accumulated in the floating electrode 131.
- the state where there is no charge is the largest, and the smaller the amount of charge stored in the floating electrode 131, the smaller the state. Therefore, the value of data stored in the memory transistor 101 is read by detecting this current with the current detection means.
- the memory device 10 can write and store data by irradiating each memory cell 100 with an electron beam. Therefore, for each memory cell 100, a wiring for accumulating electric charge with respect to the floating electrode of the memory transistor becomes unnecessary. In addition, when data is written in each memory cell 100, the value of the written data cannot be changed unless the electron beam is again irradiated to the memory cell 100. Therefore, it is possible to prevent the data written in the memory device 10 from being easily falsified.
- the via 151 when the via 151 is irradiated with an electron beam, a part of the electrons contained in the irradiated electron beam may be scattered around the via 151.
- the conductive guard ring 171 is provided around the via 151 as described above, the scattered electrons are trapped by the guard ring 171. Therefore, in the memory transistor 101, for example, the scattered electrons are taken into the insulating film 123, so that electric charges can be prevented from being accumulated in the insulating film 123 over time.
- FIGS. 4 to 8 are sectional views of the memory cell 100-1 at each stage of the manufacturing process of the memory cell 100-1.
- the read control unit 20, the row address designating unit 30, the column address designating unit 40, and the plurality of memory cells 100 are formed on a polysilicon semiconductor substrate 110 by a semiconductor process. It is manufactured by being inserted.
- a manufacturing method of the memory cell 100-1 which is a part of the manufacturing process will be described.
- a plurality of isolation regions 115 are formed by thermally oxidizing a part of the semiconductor substrate 110. Then, the source region 111 and the drain region 113 are formed in one region separated by the separation region 115 on the semiconductor substrate 110. In addition, a source region 112 and a drain region 114 are formed in a region adjacent to the one region.
- the source regions 111 and 112 and the drain regions 113 and 114 are n-type ions (for example, from the upper surface of the semiconductor substrate 110 to a predetermined depth). It is formed by implanting (phosphorus ions). Note that when the memory transistor 101 and the read control transistor 102 have P-type channel characteristics, the source regions 111 and 112 and the drain regions 113 and 114 have p-type ions (for example, boron) from the upper surface of the semiconductor substrate 110 to a predetermined depth. Ions).
- an insulating film 121 is formed on the surface of the semiconductor substrate 110.
- the floating electrode 131 and the control electrode 132 are formed on the insulating film 121.
- the insulating layer 121 of silicon dioxide may be formed by thermally oxidizing the surface layer of the semiconductor substrate 110 of single crystal silicon, and the floating electrode 131 and the control electrode may be formed by stacking polysilicon. 132 may be formed.
- an insulating film 122 is formed on the insulating film 121 so as to cover the outer surfaces of the insulating film 121, the floating electrode 131, and the control electrode 132. Then, after part of the insulating film 121 and the insulating film 122 is removed, pattern wirings 161, 162, and 163 are formed. More specifically, for example, after first depositing an insulating metal oxide on the insulating film 121, one of the insulating films 121 and 122 on the source regions 111 and 112 and the drain regions 113 and 114. The part is removed by pattern etching.
- pattern wirings 161, 162, and 163 may be formed by vacuum-depositing a conductive metal material such as aluminum around the etched portion.
- a conductive metal material such as aluminum around the etched portion.
- an insulating film 123 is further formed on the insulating film 122. Then, after a through hole is formed by performing pattern etching on a portion of the insulating film 122 and the insulating film 123 that covers the floating electrode 131 and the control electrode 132, a conductive metal is deposited in the through hole to thereby form a via. 151 and vias 152 are formed. Note that the method for forming the insulating film 123 may be substantially the same as the method for forming the insulating film 122.
- a guard ring 171 is formed around the via 151 on the insulating film 123.
- a pattern wiring 165 is formed on the via 152 on the insulating film 123.
- the source terminal 181, the drain terminal 183, and the control terminal 185 may also be formed.
- each of the guard ring 171, the pattern wiring 165, and each of the terminals may be formed by vacuum-depositing a conductive metal material such as aluminum.
- the memory cell 100-1 can be formed on the semiconductor substrate 110.
- the manufacturing method of the other memory cells 100 in the memory device 10 is substantially the same as the manufacturing method of the memory cell 100-1.
- the electron beam may be irradiated to the via 151 in the memory transistor 101 of the memory cell 100 to which data is to be written with a predetermined irradiation amount after the above process. .
- predetermined data may be written in advance when the memory device 10 is manufactured.
- FIG. 9 is a cross-sectional view showing another configuration example of the memory cell 100-1.
- the memory cell 100-1 of this example has a through hole 191 formed by pattern etching, for example, instead of the via 151 in the memory cell 100-1 described with reference to FIG. Have. Others have the same configuration as the memory cell 100-1 described above, and thus the description thereof is omitted.
- the memory transistor 101 of the memory cell 100-1 has the through hole 191, so that the electron beam can be directly irradiated to the floating electrode 131.
- the thickness of the insulating film 122 and the insulating film 123 on the floating electrode 131 is set so that the electron beam passes through the insulating film 122 and the insulating film 123 and floats when the floating electrode 131 is irradiated with the electron beam.
- FIG. 10 is a cross-sectional view showing still another configuration example of the memory cell 100-1.
- the memory cell 100-1 of this example has a guard ring 172 instead of the guard ring 171 in the memory cell 100-1 described with reference to FIG. Since the configuration other than the guard ring 172 is the same as that of the memory cell 100-1, description thereof is omitted.
- the guard ring 172 is formed by, for example, pattern-etching the peripheral portion of the via 151 in the insulating film 123 and then depositing a conductive material in an etching groove formed by the etching.
- FIG. 10 shows only a cross-sectional view of the guard ring 172, but the shape of the guard ring 172 at the peripheral edge of the via 151 may be the same as that of the guard ring 171 described above. Since the memory transistor 101 of the memory cell 100-1 includes the guard ring 172 as in this example, the guard ring can be prevented from being peeled off due to external contact with the memory device 10 or the like.
- FIG. 11 is a cross-sectional view showing still another configuration example of the memory cell 100-1.
- the insulating film 122 is provided so as to cover at least a part of the surface of the floating electrode 131 while covering the surface of the floating electrode 131.
- a guard ring 171 is provided on the peripheral edge of the floating electrode 131 on the insulating film 122.
- the package portion is formed on the uppermost layer on the semiconductor substrate 110 so as to cover the upper surfaces of the pattern wirings 161, 162, 163, the guard ring 171, and the floating electrode 131 provided on the insulating film 122. 200 is formed.
- the package unit 200 includes the memory device 10 after the charge is accumulated in the floating electrode of the memory transistor by irradiating the electron beam to the memory transistor of the memory cell 100 to which data is to be written in the memory device 10. It may be provided as follows.
- an insulating resin material is preferably used for the package part 200. As in this example, by writing data to the memory cell 100 of the memory device 10 and then packaging the memory device 10 with the package unit 200, the data written in the memory device 10 can be prevented from being falsified. it can.
- the memory cell 100 of this example can be used as a storage element that stores identification information of the memory device 10, for example. As a result, it is possible to check the lot or date of manufacture of the electronic circuit by reading the identification information for the memory device 10 returned due to a defect or the like after shipment while preventing falsification of the identification information.
- the memory device 10 shown in FIG. 11 may have a via that connects the upper surface of the package unit 200 and the floating electrode 131 of the memory transistor 101.
- data can be written to the floating electrode 131 of the memory transistor 101 by irradiating the via with an electron beam after the memory device 10 is packaged by the package unit 200.
- falsification of written data can be prevented by fixing the package covering the exterior of the package unit 200 by adhesion or the like so that it cannot be removed.
Landscapes
- Engineering & Computer Science (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Power Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Physics & Mathematics (AREA)
- Ceramic Engineering (AREA)
- Condensed Matter Physics & Semiconductors (AREA)
- General Physics & Mathematics (AREA)
- Computer Hardware Design (AREA)
- Non-Volatile Memory (AREA)
- Semiconductor Memories (AREA)
Abstract
Description
Claims (21)
- 電子ビームが照射可能に設けられ、データを記憶するメモリデバイスであって、
前記電子ビームが照射されることでデータを記憶する複数のフローティング電極と、
それぞれの前記フローティング電極に蓄積された電荷量に基づいて、前記フローティング電極が記憶したデータを検出する電荷量検出部と
を備えるメモリデバイス。 - それぞれの前記フローティング電極の表面を覆う絶縁膜と、
前記絶縁膜の表面から前記フローティング電極まで貫通して設けられる導電材料のビアと
を更に備える請求項1に記載のメモリデバイス。 - 前記絶縁膜の表面において前記ビアを囲むように設けられ、基準電位に接続されるガードリングを更に備える
請求項2に記載のメモリデバイス。 - それぞれの前記フローティング電極の表面を覆う絶縁膜を更に備え、
前記絶縁膜には、前記絶縁膜の表面から前記フローティング電極まで貫通する貫通孔が形成される
請求項1に記載のメモリデバイス。 - それぞれの前記フローティング電極の表面の少なくとも一部が表出するように、前記フローティング電極の表面を覆う絶縁膜を更に備える
請求項1に記載のメモリデバイス。 - 前記メモリデバイスは、半導体基板上に所定の材料を積層して形成され、
前記絶縁膜は、前記半導体基板上における最上層に形成される
請求項2から5のいずれかに記載のメモリデバイス。 - 電子ビームが照射されることにより書き込まれたデータを記憶するメモリデバイスの製造方法であって、
半導体基板上にフローティング電極を形成し、
前記フローティング電極に電子ビームを照射して書き込むべきデータに応じた電荷を前記フローティング電極に保持させる製造方法。 - 前記フローティング電極を複数形成し、
それぞれの前記フローティング電極に対して書き込むべき前記データの値に応じて前記電子ビームを調整して照射することで、前記データの値に応じた電荷を前記フローティング電極に保持させる
請求項7に記載の製造方法。 - 前記フローティング電極に書き込むべき前記データの値に応じて、前記フローティング電極に前記電子ビームを照射する時間を調整する
請求項7または8に記載の製造方法。 - 前記フローティング電極に書き込むべき前記データの値に応じて、前記電子ビームの電流量を調整する
請求項7または8に記載の製造方法。 - 前記フローティング電極の表面を覆う絶縁膜を形成し、
前記フローティング電極の表面上の前記絶縁膜に前記電子ビームを照射して前記フローティング電極に電子を注入する
請求項7から10のいずれかに記載の製造方法。 - 前記フローティング電極の表面の一部を覆う絶縁膜を形成し、
前記絶縁膜で覆われていない前記フローティング電極の表面に前記電子ビームを照射して前記フローティング電極に電子を注入する
請求項7から10のいずれかに記載の製造方法。 - 前記フローティング電極の表面を覆う絶縁膜を形成し、
前記絶縁膜の表面から前記フローティング電極まで貫通する導電材料のビアを形成し、
前記絶縁膜の表面に表出した前記ビアに前記電子ビームを照射して前記フローティング電極に電荷を蓄積させる
請求項7から10のいずれかに記載の製造方法。 - 前記フローティング電極の表面を覆う絶縁膜を形成し、
前記絶縁膜の表面から前記フローティング電極まで貫通する貫通孔を形成し、
前記貫通孔を介して前記フローティング電極に前記電子ビームを照射する
請求項7から10のいずれかに記載の製造方法。 - 前記フローティング電極に電子を注入した後に、前記メモリデバイスを内包するパッケージ部を形成する
請求項12から14のいずれかに記載の製造方法。 - 前記メモリデバイスは、半導体基板上に所定の材料を積層して形成され、
前記パッケージ部を、前記半導体基板上における最上層に形成する
請求項15に記載の製造方法。 - 前記メモリデバイスの識別情報を、前記フローティング電極に電子ビームを照射することで書き込む
請求項16に記載の製造方法。 - 記憶すべきデータに応じた電荷をフローティング電極に保持することにより前記データを記憶するメモリデバイスに、前記データを書き込むデータ書込方法であって、
書き込むべき前記データに応じて、前記フローティング電極に電子ビームを照射するデータ書込方法。 - 前記フローティング電極に紫外線を照射することで、前記フローティング電極に蓄積した電荷を放電させ、前記メモリデバイスに書き込んだデータを消去する
請求項18に記載のデータ書込方法。 - 既にデータが書き込まれている前記フローティング電極に新たなデータを書き込む場合、当該フローティング電極に紫外線を照射して当該フローティング電極に蓄積した電荷を放電させてから、書き込むべき新たなデータに応じて当該フローティング電極に電子ビームを照射する
請求項18に記載のデータ書込方法。 - 前記フローティング電極に蓄積されている電荷量より大きい電荷量のデータを書き込む場合、当該フローティング電極が記憶したデータ値と、新たに書き込むべきデータ値との差分に応じて、当該フローティング電極に電子ビームを照射し、
前記フローティング電極に蓄積されている電荷量より小さい電荷量のデータを書き込む場合、当該フローティング電極に紫外線を照射して当該フローティング電極に蓄積した電荷を放電させてから、書き込むべき新たなデータに応じて当該フローティング電極に電子ビームを照射する
請求項18に記載のデータ書込方法。
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
KR1020107027071A KR101195959B1 (ko) | 2008-09-10 | 2008-09-10 | 메모리 디바이스, 메모리 디바이스의 제조 방법, 및 데이터 기입 방법 |
PCT/JP2008/066350 WO2010029618A1 (ja) | 2008-09-10 | 2008-09-10 | メモリデバイス、メモリデバイスの製造方法、およびデータ書込方法 |
JP2010528556A JPWO2010029618A1 (ja) | 2008-09-10 | 2008-09-10 | メモリデバイス、メモリデバイスの製造方法、およびデータ書込方法 |
TW098130601A TWI409956B (zh) | 2008-09-10 | 2009-09-10 | 記憶體元件、記憶體元件的製造方法及資料寫入方法 |
US12/959,298 US8369126B2 (en) | 2008-09-10 | 2010-12-02 | Memory device, manufacturing method for memory device and method for data writing |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/JP2008/066350 WO2010029618A1 (ja) | 2008-09-10 | 2008-09-10 | メモリデバイス、メモリデバイスの製造方法、およびデータ書込方法 |
Related Child Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US12/959,298 Continuation US8369126B2 (en) | 2008-09-10 | 2010-12-02 | Memory device, manufacturing method for memory device and method for data writing |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2010029618A1 true WO2010029618A1 (ja) | 2010-03-18 |
Family
ID=42004887
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2008/066350 WO2010029618A1 (ja) | 2008-09-10 | 2008-09-10 | メモリデバイス、メモリデバイスの製造方法、およびデータ書込方法 |
Country Status (5)
Country | Link |
---|---|
US (1) | US8369126B2 (ja) |
JP (1) | JPWO2010029618A1 (ja) |
KR (1) | KR101195959B1 (ja) |
TW (1) | TWI409956B (ja) |
WO (1) | WO2010029618A1 (ja) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2010046997A1 (ja) * | 2008-10-24 | 2010-04-29 | 株式会社アドバンテスト | 電子デバイスおよび製造方法 |
TWI762894B (zh) * | 2019-11-05 | 2022-05-01 | 友達光電股份有限公司 | 電路裝置 |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5454586A (en) * | 1977-09-19 | 1979-04-28 | Motorola Inc | Electron beam programmable semiconductor structure |
JPS56134776A (en) * | 1980-03-01 | 1981-10-21 | Itt | Semiconductor storage cell |
JPS5766675A (en) * | 1980-10-14 | 1982-04-22 | Oki Electric Ind Co Ltd | Semiconductor memory device |
JPH02307276A (ja) * | 1989-05-22 | 1990-12-20 | Matsushita Electron Corp | Mos型半導体メモリ装置 |
JPH07130890A (ja) * | 1993-10-28 | 1995-05-19 | Nippon Steel Corp | 不揮発性半導体記憶装置及びその製造方法 |
JP2006066758A (ja) * | 2004-08-30 | 2006-03-09 | Mitsubishi Electric Corp | 半導体装置の製造方法 |
Family Cites Families (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4292729A (en) * | 1977-09-19 | 1981-10-06 | Motorola, Inc. | Electron-beam programmable semiconductor device structure |
US4450537A (en) * | 1981-08-19 | 1984-05-22 | Siemens Aktiengesellschaft | Monolithically integrated read-only memory |
US5245570A (en) | 1990-12-21 | 1993-09-14 | Intel Corporation | Floating gate non-volatile memory blocks and select transistors |
JP3980178B2 (ja) * | 1997-08-29 | 2007-09-26 | 株式会社半導体エネルギー研究所 | 不揮発性メモリおよび半導体装置 |
JP4034500B2 (ja) * | 2000-06-19 | 2008-01-16 | 株式会社日立製作所 | 半導体装置の検査方法及び検査装置、及びそれを用いた半導体装置の製造方法 |
US6680505B2 (en) * | 2001-03-28 | 2004-01-20 | Kabushiki Kaisha Toshiba | Semiconductor storage element |
US7038224B2 (en) * | 2002-07-30 | 2006-05-02 | Applied Materials, Israel, Ltd. | Contact opening metrology |
US7075593B2 (en) * | 2003-03-26 | 2006-07-11 | Video Display Corporation | Electron-beam-addressed active-matrix spatial light modulator |
JP4537834B2 (ja) * | 2004-11-16 | 2010-09-08 | 富士通セミコンダクター株式会社 | 半導体装置の製造方法 |
JP5168845B2 (ja) * | 2006-08-07 | 2013-03-27 | 株式会社リコー | 積層構造体、積層構造体を用いた電子素子、これらの製造方法、電子素子アレイ及び表示装置 |
-
2008
- 2008-09-10 KR KR1020107027071A patent/KR101195959B1/ko not_active IP Right Cessation
- 2008-09-10 JP JP2010528556A patent/JPWO2010029618A1/ja not_active Ceased
- 2008-09-10 WO PCT/JP2008/066350 patent/WO2010029618A1/ja active Application Filing
-
2009
- 2009-09-10 TW TW098130601A patent/TWI409956B/zh not_active IP Right Cessation
-
2010
- 2010-12-02 US US12/959,298 patent/US8369126B2/en not_active Expired - Fee Related
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5454586A (en) * | 1977-09-19 | 1979-04-28 | Motorola Inc | Electron beam programmable semiconductor structure |
JPS56134776A (en) * | 1980-03-01 | 1981-10-21 | Itt | Semiconductor storage cell |
JPS5766675A (en) * | 1980-10-14 | 1982-04-22 | Oki Electric Ind Co Ltd | Semiconductor memory device |
JPH02307276A (ja) * | 1989-05-22 | 1990-12-20 | Matsushita Electron Corp | Mos型半導体メモリ装置 |
JPH07130890A (ja) * | 1993-10-28 | 1995-05-19 | Nippon Steel Corp | 不揮発性半導体記憶装置及びその製造方法 |
JP2006066758A (ja) * | 2004-08-30 | 2006-03-09 | Mitsubishi Electric Corp | 半導体装置の製造方法 |
Also Published As
Publication number | Publication date |
---|---|
KR101195959B1 (ko) | 2012-11-05 |
TWI409956B (zh) | 2013-09-21 |
US8369126B2 (en) | 2013-02-05 |
JPWO2010029618A1 (ja) | 2012-02-02 |
KR20110015586A (ko) | 2011-02-16 |
TW201015721A (en) | 2010-04-16 |
US20110242895A1 (en) | 2011-10-06 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US7623368B2 (en) | Non-volatile semiconductor memory based on enhanced gate oxide breakdown | |
JP5259552B2 (ja) | 不揮発性半導体記憶装置及びその駆動方法 | |
US8476157B2 (en) | Buried bit line anti-fuse one-time-programmable nonvolatile memory | |
KR20090011452A (ko) | 비휘발성 메모리 소자의 낸드형 저항성 메모리 셀 스트링들및 그 제조방법들 | |
US6327174B1 (en) | Method of manufacturing mask read-only memory cell | |
JP2011096341A (ja) | 不揮発性半導体記憶装置 | |
JP2009290189A (ja) | 不揮発性半導体記憶装置 | |
KR20090106909A (ko) | 메모리 소자 및 그 동작방법 | |
JP2009059931A (ja) | 不揮発性半導体記憶装置 | |
JP5785826B2 (ja) | Otpメモリ | |
JP2010165794A (ja) | 半導体記憶装置 | |
JP6454646B2 (ja) | 電荷トラップスプリットゲートデバイス及びその製作方法 | |
JP4959990B2 (ja) | 半導体装置 | |
KR100967680B1 (ko) | 상변화 기억 소자 및 그의 제조방법 | |
FR3084771A1 (fr) | Element anti-fusible compact et procede de fabrication | |
JP2011023705A (ja) | 不揮発性半導体記憶装置 | |
WO2010029618A1 (ja) | メモリデバイス、メモリデバイスの製造方法、およびデータ書込方法 | |
KR101347624B1 (ko) | 비휘발성 메모리, 그 제조 방법, 및 당해 메모리의 기록 및판독 방법 | |
US9245603B2 (en) | Integrated circuit and operating method for the same | |
JP2009212149A (ja) | Nand混載型半導体時限スイッチ | |
KR100543198B1 (ko) | 멀티 기준전압 발생 장치를 갖는 강유전체 메모리 소자 | |
JP2011082384A (ja) | 半導体記憶装置 | |
KR20080012241A (ko) | 재프로그램가능한 비-휘발성 메모리 셀 | |
JP2006179750A (ja) | 半導体装置 | |
JP2010027154A (ja) | 半導体装置へのデータ書き込み方法、半導体装置 |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
121 | Ep: the epo has been informed by wipo that ep was designated in this application |
Ref document number: 08810404 Country of ref document: EP Kind code of ref document: A1 |
|
WWE | Wipo information: entry into national phase |
Ref document number: 2010528556 Country of ref document: JP |
|
ENP | Entry into the national phase |
Ref document number: 20107027071 Country of ref document: KR Kind code of ref document: A |
|
NENP | Non-entry into the national phase |
Ref country code: DE |
|
122 | Ep: pct application non-entry in european phase |
Ref document number: 08810404 Country of ref document: EP Kind code of ref document: A1 |