WO2006095903A1 - 累積型化学・物理現象検出装置 - Google Patents
累積型化学・物理現象検出装置 Download PDFInfo
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- WO2006095903A1 WO2006095903A1 PCT/JP2006/304868 JP2006304868W WO2006095903A1 WO 2006095903 A1 WO2006095903 A1 WO 2006095903A1 JP 2006304868 W JP2006304868 W JP 2006304868W WO 2006095903 A1 WO2006095903 A1 WO 2006095903A1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/26—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating electrochemical variables; by using electrolysis or electrophoresis
- G01N27/403—Cells and electrode assemblies
- G01N27/414—Ion-sensitive or chemical field-effect transistors, i.e. ISFETS or CHEMFETS
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/26—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating electrochemical variables; by using electrolysis or electrophoresis
- G01N27/403—Cells and electrode assemblies
- G01N27/414—Ion-sensitive or chemical field-effect transistors, i.e. ISFETS or CHEMFETS
- G01N27/4148—Integrated circuits therefor, e.g. fabricated by CMOS processing
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/26—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating electrochemical variables; by using electrolysis or electrophoresis
- G01N27/416—Systems
Definitions
- the present invention relates to a cumulative chemical / physical phenomenon detection device (hereinafter sometimes simply referred to as “device”).
- Patent Document 1 As a cumulative type chemical / physical phenomenon detection device, devices described in Patent Document 1, Patent Document 2, and the like are known.
- Fig. 1 shows an example of using this cumulative chemical and physical phenomenon detector to measure ion concentration.
- n + type doped regions 11 and 13 and a p type doped region 15 are formed.
- a silicon oxide film 19 is laminated as a gate insulating film.
- Two gate electrodes 22 and 24 are provided on the silicon oxide film 19.
- Reference numeral 23 in the figure is a silicon nitride film.
- a liquid bath 31 is provided on the silicon nitride film 23, and an aqueous solution 32 to be measured for ion concentration (pH) is filled therein.
- Reference numeral 26 denotes a reference electrode, which is kept at a constant potential.
- n + region 11, the gate electrode 22, the gate electrode 24, and the n + region 13 of the substrate are connected to the terminals ID, ICG, TG, and FD, respectively, and a predetermined potential is applied at a predetermined timing.
- the n + region 11 of the substrate becomes the charge supply portion 1
- the portion corresponding to the gate electrode 22 becomes the charge injection adjusting portion 2
- the portion corresponding to the silicon nitride film 23 becomes the sensing portion 3
- the portion corresponding to 24 becomes the barrier portion 4, and the n + -type region 13 becomes the floating diffusion portion 5.
- FIG. 2 shows the theoretical operation of the conventional chemical / physical phenomenon detector configured as described above.
- the sensing part 3 is charged by lowering the potential applied to the charge supply part 1 (step 3). Thereafter, by raising the potential of the charge supply unit 1, the charge that has been worn out by the charge injection control unit 2 remains in the sensing unit 3 (step 5). In step 7, the remaining charge is accumulated in the floating diffusion portion 5.
- Patent Document 1 Japanese Patent Laid-Open No. 10-332423
- Patent Document 2 JP 2002-98667 A
- FIG. 4A The actual sensor output characteristics are shown in Fig. 4A.
- Figure 4B shows the theoretical sensor output characteristics. If the inflection point of the output curve becomes ambiguous as shown in Fig. 4A, accurate measurement becomes impossible. That is, sufficient sensitivity cannot be obtained.
- a second cause is that electric charges are trapped in the interface state of the sensing unit 3.
- the residual charge is also transferred to the floating diffusion and causes a decrease in sensitivity (see Fig. 7).
- the first aspect of the present invention employs the following configuration.
- Cumulative chemical physics characterized in that it is provided with a removing means for removing charges remaining in the sensing part from the sensing part by a knot of potential formed between the sensing part and the charge injection control part. Phenomenon detection device.
- the charge remaining in the sensing unit is removed by the removing means, it is not transferred to the floating diffusion unit. Therefore, output characteristics are improved and sensitivity is increased.
- the removing means a continuous removal well is provided in the sensing unit, and the electric charge remaining in the removal well can be temporarily evacuated. Since the removal well can be provided with a simple configuration in which electrodes are arranged, it is possible to prevent the apparatus from becoming complicated. Therefore, an inexpensive device can be provided.
- FIG. 1 An example in which the removal well 50 is formed is shown in FIG. 1
- the depth of the potential well of the removal well is changed. More specifically, as shown in FIG. 9, the potential of the removal well 50 is lowered to deepen the well, and the charge of the sensing unit 3 is sucked into the removal well 50. At this time, the hump 52 present in the sensing unit 3 is extinguished by forming a fringing field (edge electric field) by the electric field that forms the removal well 50. As a result, the charge present in the sensing unit 3 can be sucked.
- the potential of one removal well is changed to change the depth of the potential well of the removal well, but the remaining of the sensing part is also formed by forming a new removal well. It can absorb and absorb charges.
- the electric potential of the charge injection adjusting portion is set higher than that of the removal well, and the charge of the removal well is caused to flow into the charge supply portion.
- FIG. 1 is a cross-sectional view showing a configuration of a conventional cumulative chemical'physical phenomenon detection apparatus.
- Figure 2 shows the theoretical operation of a cumulative chemical 'physical phenomenon detector.
- Figure 3 shows the theoretical output characteristics of the cumulative chemical 'physical phenomenon detector.
- Fig. 4 shows the output characteristics of a conventional cumulative chemical 'physical phenomenon detector, and Fig. 4 (B) shows the theoretical output characteristics.
- FIG. 5 is a diagram for explaining a false signal generation mechanism of a conventional cumulative chemical 'physical phenomenon detector.
- Fig. 6 shows the operation of a conventional cumulative chemical / physical phenomenon detection device in which charge remains in the sensing section.
- FIG. 7 is a diagram for explaining the influence of charges trapped on the substrate surface of the sensing unit.
- FIG. 8 schematically shows a configuration of a cumulative chemical 'physical phenomenon detection apparatus of the present invention.
- FIG. 9 is a schematic view showing the operation of the removal well of the cumulative chemical'physical phenomenon detection apparatus of the present invention.
- FIG. 10 is a schematic diagram for explaining the state of the substrate surface of the sensing unit in the cumulative chemical 'physical phenomenon detection device of the present invention.
- FIG. 11 is a schematic diagram showing a cumulative chemical 'physical phenomenon detection device of an embodiment of the present invention.
- Fig. 12 shows the operation of the cumulative chemical 'physical phenomenon detection device of the embodiment.
- FIG. 13 shows another operation example of the cumulative chemical'physical phenomenon detection apparatus of the embodiment.
- FIG. 14 shows the layout of each element constituting the cumulative chemical'physical phenomenon detection apparatus of the embodiment, and FIG. 14 (B) is a plan view thereof.
- FIG. 15 shows the output characteristics of the cumulative chemical / physical phenomenon detector of the example.
- FIG. 16 is a diagram for explaining a method for specifying a reference voltage Vrefl.
- Figure 17 shows the relationship between pH value and output voltage when the reference voltage is fixed at Vrefl (calibration curve).
- FIG. 18 shows the cumulative output characteristics of the cumulative chemical'physical phenomenon detector of the example.
- FIG. 19 shows the cumulative output characteristics of a conventional cumulative chemical 'physical phenomenon detector.
- FIG. 20 is a plan view showing a sensor chip in which the cumulative chemical / physical phenomenon detection device of the example is arrayed.
- Fig. 21 shows an output example of the sensor chip (an example in which an alkaline solution is added to an acidic solution and the change is imaged).
- FIG. 22 shows an example of another sensor chip in which the cumulative chemical 'physical phenomenon detection device of the embodiment is integrated.
- FIG. 11 shows a cumulative type chemical 'physical phenomenon detection device 60 of the example.
- elements that perform the same operations as in FIG. 1 are denoted by the same reference numerals and description thereof is omitted.
- a gate electrode (first charge control electrode) 22 and a removal electrode (second charge control electrode) 62 are provided between the charge supply unit 1 and the sensing unit 3.
- the removal electrode 62 controls the potential of the removal well 50.
- the surface of the p-type region 15 is made n-type by silicon. This prevents charges from being trapped on the surface level of the sensing unit 3.
- Step 1 shows the standby state. In this standby state, the charge remains in the sensing unit as described in Fig. 8! /
- step 3 the potential of the charge supply unit 1 is lowered to charge the sensing unit 3. Thereafter, by raising the potential of the charge supply unit 1, the charge that has been worn out by the charge injection adjusting unit 2 remains in the sensing unit 3 (step 5). At this time, even when the signal is not accumulated in the sensing unit 3, the signal remains as described with reference to FIG.
- the potential of the removal well 50 is increased to deepen the removal well 50, thereby sucking the residual charge of the sensing unit 3 into the removal well 50.
- the substrate surface corresponding to the sensing unit 3 is doped n-type, charges are not trapped on the surface. Therefore, charges can be removed from the sensing unit 3 in a short time. Even when a signal accumulates in the sensing section 3, the amount of force that is sucked into the removal well 50 is always the same, so the output is not affected.
- the potential of the removal electrode 62 is increased to make the potential of the removal well 50 deeper than the potential of the sensing unit 3, but this is the same potential as the sensing unit 3,
- the potential of the lever may be deepened.
- step 7 the potential of the barrier unit 4 is increased to cause the charge of the sensing unit 3 to float. Transfer to diffusion unit 5. At this time, there is no charge remaining in the sensing section 3 due to the potential hump, so that the remaining charge is not accumulated in the floating diffusion section 5. In addition, since the substrate surface of the sensing unit 3 is doped n-type, charges are not trapped there, so even when signals accumulate, all of the charges accumulated in the sensing unit 3 can be completely and quickly removed. Can be transferred to floating diffusion part 5.
- Step 9 the potential of the removal well 50 is returned to the standby state.
- Step 9 It is preferable to discharge the charge accumulated in the removal well 50 before performing Step 9. Therefore, for example, as shown in step 8 of FIG. 13, it is preferable to increase the potential of the charge injection adjusting unit 2 to return the charge in the removal well 50 to the charge supplying unit 1.
- FIG. 14A shows a layout diagram of the apparatus of the example.
- FIG. 14B is a micrograph of the sensing part 3.
- the area of the sensing part 3 is 10000 ⁇ m 2 and the area of the floating diffusion part 5 is 1500 m 2 .
- the thickness of the silicon nitride film 23 that causes the potential hump is 0.1 ⁇ m.
- Reference voltage Vre Figure 15 shows the output voltage when swept.
- a signal is output even when the potential difference between the reference electrode 26 and the gate electrode 22 is zero (the signal is not accumulated).
- the device 60 of this embodiment shows the ideal characteristics!
- the sensing unit also has a cumulative charge of 1 to the floating diffusion unit.
- the reference voltage Vrefl at the center of the slope is specified.
- V is an output signal (voltage).
- a difference value G (V) between the reset voltage and the output voltage is used.
- the difference value is represented by a function G (V) of the output signal.
- G (V) is a calibration curve that defines the relationship between the pH value and the output voltage. Therefore, it can be seen that the pH value can be specified from the output voltage V.
- FIG. 18 shows a change in output when the unit detection operation is repeated in the device 60 of this embodiment.
- the horizontal axis indicates the voltage value of the reference electrode.
- Ru can produce a change in the pseudo P H.
- the output change when the unit detection operation is repeated in the conventional apparatus is shown in FIG. From the comparison between FIG. 18 and FIG. 19, it can be seen that according to the apparatus of the embodiment, no noise is generated when the unit detection operation is repeated and charges are accumulated in the floating diffusion portion. As a result, the sensitivity is improved. In this example, the unit detection operation was repeated 10 times, and the sensitivity increased about 10 times.
- FIG. 20 shows a sensor chip in which the apparatus shown in FIG. 11 is arranged 10 vertically and 10 horizontally. Each device is immersed in the same aqueous solution, and the signal from each device is displayed as a color or pattern corresponding to the magnitude of the signal.
- Figure 21 shows an example of image display.
- the pixels that make up the image shown in Fig. 21 correspond to each device.
- Fig. 21 (a) shows the original acidic solution
- Fig. 21 (b) and Fig. 21 (c) show the pH change of the whole solution after adding the alkaline solution to this solution.
- FIG. 22 shows an array sensor in which 32 devices of the embodiment are arranged vertically and 32 horizontally, and shift registers are added in the vertical and horizontal directions, respectively.
- L-glutamic acid oxidase is used instead of the silicon nitride film or laminated on the silicon nitride film to detect L-glutamic acid. It can be set as the chemical-phenomenon detection apparatus to show.
- DNA antigens and antibodies can be detected by immobilizing DNA and antigens on a silicon nitride film. It is also possible to stack a gold film and Z or SAM film (self-forming monomolecular film) on the silicon nitride film. Connect the output of the temperature sensor, pressure sensor or magnetic sensor to the position of the silicon nitride film. Thus, a physical phenomenon detection apparatus capable of measuring temperature, pressure, or magnetism is obtained.
- the present invention is not limited to the description of the embodiments and examples of the above-described invention. Various modifications are also included in the present invention as long as those skilled in the art can easily conceive without departing from the scope of the claims.
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Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
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JP2007507224A JP4171820B2 (ja) | 2005-03-11 | 2006-03-13 | 累積型化学・物理現象検出装置 |
EP06715591.1A EP1870703B1 (en) | 2005-03-11 | 2006-03-13 | Cumulative chemical or physical phenomenon detecting apparatus |
KR1020137004786A KR101343044B1 (ko) | 2005-03-11 | 2006-03-13 | 누적형 화학·물리현상 검출장치 |
US11/886,130 US7826980B2 (en) | 2005-03-11 | 2006-03-13 | Cumulative chemical/physical phenomenon detecting apparatus |
Applications Claiming Priority (2)
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JP2005069501 | 2005-03-11 | ||
JP2005-069501 | 2005-03-11 |
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WO2006095903A1 true WO2006095903A1 (ja) | 2006-09-14 |
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PCT/JP2006/304868 WO2006095903A1 (ja) | 2005-03-11 | 2006-03-13 | 累積型化学・物理現象検出装置 |
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US (1) | US7826980B2 (ja) |
EP (1) | EP1870703B1 (ja) |
JP (1) | JP4171820B2 (ja) |
KR (2) | KR101269508B1 (ja) |
WO (1) | WO2006095903A1 (ja) |
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- 2006-03-13 US US11/886,130 patent/US7826980B2/en active Active
- 2006-03-13 WO PCT/JP2006/304868 patent/WO2006095903A1/ja active Application Filing
- 2006-03-13 EP EP06715591.1A patent/EP1870703B1/en active Active
- 2006-03-13 KR KR1020137004786A patent/KR101343044B1/ko active IP Right Grant
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WO2007108465A1 (ja) * | 2006-03-20 | 2007-09-27 | National University Corporation Toyohashi University Of Technology | 累積型化学・物理現象検出方法及びその装置 |
JP5335415B2 (ja) * | 2006-03-20 | 2013-11-06 | 国立大学法人豊橋技術科学大学 | 累積型化学・物理現象検出方法及びその装置 |
EP2224230A4 (en) * | 2007-12-20 | 2015-03-04 | Nat Univ Corp Toyohashi Univ | COMBINED DETECTOR |
WO2009081890A1 (ja) * | 2007-12-20 | 2009-07-02 | National University Corporation Toyohashi University Of Technology | 複合検出装置 |
US8388893B2 (en) | 2007-12-20 | 2013-03-05 | National University Corporation Toyohashi University Of Technology | Combined detector |
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JP2009236502A (ja) * | 2008-03-25 | 2009-10-15 | Toyohashi Univ Of Technology | 化学・物理現象検出装置及びその制御方法 |
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JPWO2016147798A1 (ja) * | 2015-03-19 | 2017-12-28 | 国立大学法人豊橋技術科学大学 | 化学・物理現象検出装置 |
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JP2020067282A (ja) * | 2018-10-22 | 2020-04-30 | 国立大学法人豊橋技術科学大学 | 化学・物理現象検出素子 |
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Also Published As
Publication number | Publication date |
---|---|
EP1870703B1 (en) | 2014-04-02 |
JPWO2006095903A1 (ja) | 2008-08-21 |
KR20070119012A (ko) | 2007-12-18 |
US20080231253A1 (en) | 2008-09-25 |
US7826980B2 (en) | 2010-11-02 |
KR20130028980A (ko) | 2013-03-20 |
KR101269508B1 (ko) | 2013-05-30 |
EP1870703A1 (en) | 2007-12-26 |
EP1870703A4 (en) | 2011-09-14 |
KR101343044B1 (ko) | 2013-12-18 |
JP4171820B2 (ja) | 2008-10-29 |
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