WO2009087703A1 - 半導体装置及びその製造方法 - Google Patents
半導体装置及びその製造方法 Download PDFInfo
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- WO2009087703A1 WO2009087703A1 PCT/JP2008/000010 JP2008000010W WO2009087703A1 WO 2009087703 A1 WO2009087703 A1 WO 2009087703A1 JP 2008000010 W JP2008000010 W JP 2008000010W WO 2009087703 A1 WO2009087703 A1 WO 2009087703A1
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- H01L29/7835—Field effect transistors with field effect produced by an insulated gate with lightly doped drain or source extension, e.g. LDD MOSFET's; DDD MOSFET's with asymmetrical source and drain regions, e.g. lateral high-voltage MISFETs with drain offset region, extended drain MISFETs
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Definitions
- the present invention relates to a semiconductor device and a manufacturing method thereof, and more particularly to a semiconductor device having a metal insulator semiconductor (MIS) type transistor with improved breakdown voltage and a manufacturing method thereof.
- MIS metal insulator semiconductor
- MIS metal insulator semiconductor
- MOS metal oxide semiconductor
- FIG. 15 shows J. C. Mitros et al. IEEE transactions on electron devices vol. 48 pp1751-1754.
- 1 is a cross-sectional view of an n-type MOS transistor disclosed in August 2001 (FIG. 1 (a)).
- the drain n-type high concentration impurity region 102 is separated from the gate electrode 100 by an offset length D.
- a low-concentration n-well 101 includes an n-type high-concentration impurity region 102 and extends to the lower part of the drain side portion of the gate electrode 100.
- MOS transistors having a structure in which a high-concentration impurity region of a drain is separated from a gate electrode through a low-concentration impurity region of the drain are disclosed in, for example, Japanese Unexamined Patent Application Publication No. 2005-093458 and Japanese Unexamined Patent Application Publication No. 2006-319331. No. 1, Japanese Unexamined Patent Publication No. 2005-136169, and Japanese Unexamined Patent Publication No. 2004-207498.
- the offset length between the high concentration impurity region of the drain and the gate is lengthened.
- the offset length increases, the on-resistance of the transistor increases, and the driving capability of the transistor decreases.
- An object of the present invention is to provide a semiconductor device including a MIS transistor capable of improving a breakdown voltage while suppressing an increase in on-resistance.
- Another object of the present invention is to provide a method for manufacturing such a semiconductor device.
- a semiconductor substrate having a first region of a first conductivity type, a gate insulating film formed on the first region, a gate electrode formed on the gate insulating film, In the first region, a source region formed on one side of the gate electrode and having a second conductivity type opposite to the first conductivity type, and in the first region, the other of the gate electrode
- the first lightly doped drain region having the second conductivity type and the gate electrode in the first lightly doped drain region are formed so that an end on the source region side penetrates below the gate electrode.
- a semiconductor device is provided.
- a method for manufacturing a semiconductor device comprising: forming a source region having the second conductivity type in the first region opposite to the drain region.
- a reverse conductivity type region of the first conductivity type is formed between the gate electrode and the high concentration drain region of the second conductivity type.
- the reverse conductivity type region forms a pn junction with the surrounding second conductivity type region.
- the depletion layer formed by the pn junction expands when the drain voltage is high, thereby improving the breakdown voltage.
- FIGS. 1A and 1B are schematic cross-sectional views for explaining the manufacturing process of the MOS transistor of the first embodiment.
- 2A to 2C are schematic cross-sectional views for explaining the manufacturing process of the MOS transistor of the first embodiment, following FIGS. 1A and 1B.
- 3A to 3C are schematic cross-sectional views for explaining the manufacturing process of the MOS transistor of the first embodiment, following FIGS. 2A to 2C.
- FIG. 4 is a schematic cross-sectional view of the MOS transistor of the first embodiment.
- FIG. 5 is a graph showing current-voltage (IV) characteristics of the MOS transistor.
- FIG. 6 is a graph showing a simulation result of investigating the relationship between the breakdown voltage performance and the on-resistance of the MOS transistor of the first embodiment.
- FIG. IV current-voltage
- FIG. 7A is a schematic cross-sectional view of the MOS transistor of the first embodiment showing a state in which the gate voltage V GS is close to 0 V and the drain voltage V DS is very high
- FIG. 7B is a diagram showing a high gate voltage V GS to a certain degree.
- FIG. 5 is a schematic cross-sectional view of the MOS transistor of the first embodiment showing a state where the drain voltage VDS is low.
- FIG. 8 is a schematic sectional view of a MOS transistor according to a modification of the first embodiment.
- FIG. 9 is a schematic cross-sectional view of the MOS transistor of the second embodiment.
- FIG. 10A is a schematic cross-sectional view of the MOS transistor of the second embodiment showing a state in which the gate voltage V GS is close to 0 V and the drain voltage V DS is very high
- FIG. 10B is a diagram showing a high gate voltage V GS of a certain level.
- It is a schematic cross-sectional view of a MOS transistor of a second embodiment showing a state where the drain voltage VDS is low.
- FIG. 11 is a schematic cross-sectional view for explaining a manufacturing process of the MOS transistor of the second embodiment.
- FIG. 12 is a schematic sectional view of a MOS transistor according to a modification of the second embodiment.
- 13A is a diagram schematically showing a portable electronic device of an application example, FIG.
- FIG. 13B is a circuit diagram showing a power amplifier transistor of the application example
- FIG. 13C shows an amplification gain by the power amplifier transistor of the application example. It is a graph shown roughly.
- FIG. 14 is a graph showing a dynamic load line of the power amplifier transistor of the application example.
- 15 is a cross-sectional view of an n-type MOS transistor described in J. C. Mitros et al.IEEE transactions on electrons devices .48 pp1751-1754March 2001.
- FIGS. 1A to 3C are schematic cross-sectional views for explaining a manufacturing process of a MOS transistor according to the first embodiment.
- an element isolation region 2 that defines an active region for forming a semiconductor element is formed on an n-type silicon substrate 1.
- the element isolation region 2 can be formed by, for example, shallow trench isolation (STI).
- boron (B) for example, as a p-type impurity is implanted into the n-type silicon substrate 1 with an acceleration energy of 200 keV and a dose of 1 ⁇ 10 13 cm ⁇ 2 (hereinafter referred to as 1E13).
- 1E13 a dose of 1 ⁇ 10 13 cm ⁇ 2
- B is implanted into the p-type well 3 at an acceleration energy of 20 keV and a dose of 1E12 for threshold adjustment.
- a portion that does not require ion implantation is covered with a resist mask RM1, and phosphorus (P), for example, as an n-type impurity is applied to a part of the p-type well 3 with an acceleration energy of 200 keV and a dose of 1E13.
- Implantation is performed to form a lightly doped drain (LDD) region 4.
- LDD lightly doped drain
- the surfaces of the p-type well 3 and the LDD region 4 are thermally oxidized to form a gate insulating film 5 having a thickness of 5 nm to 10 nm, for example.
- the material and thickness of the gate insulating film are selected so as to satisfy the requirements for the withstand voltage between the gate and drain (and between the source and gate) when the MOS transistor operates at a DC voltage.
- the gate insulating film 5 made of a silicon oxide film and having a thickness of about 5 nm to 10 nm is assumed to have a withstand voltage of 3.3 V when used with direct current.
- gate insulating film 5 for example, polysilicon is deposited to a thickness of 100 nm by chemical vapor deposition (CVD). A region where the polysilicon layer is to be left is covered with a resist mask RM2, and an unnecessary polysilicon layer is removed by dry etching to form a gate electrode 6.
- the gate electrode 6 is disposed so as to overlap both the p-type well 3 and the LDD region 4. After the gate electrode 6 is formed, the resist mask RM2 is removed.
- the LDD region 4 is covered with a resist mask RM3, and further, for example, P is implanted into the p-type well 3 with an acceleration energy of 30 keV and a dose of 1E13 using the gate electrode 6 as a mask.
- a low concentration source region 7 is formed. After the low concentration source region 7 is formed, the resist mask RM3 is removed.
- the low concentration source region 7 is covered with a resist mask RM4, and further, for example, B is implanted into the LDD region 4 with an acceleration energy of 3 keV and a dose of 1E13 using the gate electrode 6 as a mask.
- the conductivity type of the surface layer of the LDD region 4 is inverted from n-type to p-type to form the reverse conductivity type region 8.
- the ion implantation in the oblique direction is performed so that the end of the reverse conductivity type region 8 on the gate electrode 6 side is formed under the gate electrode 6.
- the resist mask RM4 is removed.
- an insulating film such as a silicon oxide film is deposited to a thickness of 50 nm on the gate insulating film 5 so as to cover the gate electrode 6 by CVD.
- a resist mask RM5 is formed so as to cover the drain side end of the gate electrode 6 and the gate electrode side region of the reverse conductivity type region 8.
- RIE reactive ion etching
- Etching is completed with the sidewall spacer 9 left on the source side wall of the gate electrode 6.
- the silicide block insulating film 10 that covers the vicinity of the end of the gate electrode 6 on the drain side (at least covers the side surface of the gate electrode 6 on the drain side) and extends up to a part of the reverse conductivity type region 8. Remains.
- the gate insulating film 5 is also patterned into a shape matching the sidewall spacer 9 and the silicide block insulating film 10.
- arsenic (As) is implanted as an n-type impurity at an acceleration energy of 30 keV and a dose of 1E15 to form a high concentration source region. 11 and a high concentration drain (HDD) region 12 are formed. An n-type impurity is also implanted into the upper surface portion of the gate electrode 6 exposed without being covered with the silicide block insulating film 10.
- N-type impurities are implanted into the reverse conductivity type region 8 and the LDD region 4 below the reverse conductivity type region 8 to form the HDD region 12.
- the conductivity type is reversed from the p type and becomes n type again.
- the MOS transistor of the first embodiment is manufactured.
- the direction from the source side end of the gate electrode 6 toward the drain side is defined as the X direction.
- the source side is called the left side
- the drain side is called the right side.
- the X direction is also called the horizontal direction.
- the left end of the LDD region 4 is X1
- the left end of the reverse conductivity type region 8 is X2
- the right end of the reverse conductivity type region 8 is X3
- the left end of the drain side silicide region 15 is X4
- the right end of the gate electrode 6 is XGD.
- the p-type well 3 and the LDD region 4 form a pn junction.
- a reverse conductivity type region 8 and an HDD region 12 are formed inside the LDD region 4.
- the left end X2 of the reverse conductivity type region 8 is disposed away from the left end X1 of the LDD region 4 toward the HDD region 12 (X1 ⁇ X2).
- the LDD region 4 and the reverse conductivity type region 8 form an np junction.
- the reverse conductivity type region 8 and the HDD region 12 form a pn junction.
- the gate electrode 6 is formed so as to overlap both the p-type well 3 and the LDD region 4, that is, the LDD region 4 is formed so as to enter under the gate electrode 6, and the right end of the gate electrode 6 is formed.
- the left end X1 of the LDD region 4 is closer to the source side than XGD (X1 ⁇ XGD).
- the reverse conductivity type region 8 is also formed so as to enter under the gate electrode 6, and the left end X2 of the reverse conductivity type region 8 is closer to the source side than the right end XGD of the gate electrode 6 (X2 ⁇ XGD).
- the reverse conductivity type region 8 is interposed between the gate electrode 6 and the HDD region 12, and the right end XGD of the gate electrode 6 and the left end of the HDD region 12 (the right end of the reverse conductivity type region 8) X3 are separated from each other. (XGD ⁇ X3).
- the HDD region 12 below the silicide block insulating film 10 is interposed between the reverse conductivity type region 8 and the drain side silicide region 15, and the right end X3 of the reverse conductivity type region 8 and the left end X4 of the drain side silicide region 15 Are separated from each other (X3 ⁇ X4).
- the normal direction going downward from the surface of the substrate 1 is defined as the Y direction.
- the Y direction is also called the vertical direction.
- the lower end of the reverse conductivity type region 8 is Y1
- the lower end of the HDD region 12 is Y2
- the lower end of the LDD region 4 is Y3.
- the p-type well 3 and the LDD region 4 form a pn junction.
- the reverse conductivity type region 8 and the HDD region 12 are formed inside the LDD region 4, and the lower end Y 1 of the reverse conductivity type region 8 and the lower end Y 2 of the HDD region 12 are spaced apart from the lower end X 3 of the LDD region 4. Are arranged (Y1, Y2 ⁇ Y3). Further, the reverse conductivity type region 8 is formed on the surface of the LDD region 4, and the lower end Y1 of the reverse conductivity type region 8 is at a position shallower than the lower end Y2 of the HDD region 12 (Y1 ⁇ Y2). At the lower end Y1 of the reverse conductivity type region 8, the LDD region 4 and the reverse conductivity type region 8 form an np junction.
- the impurity concentrations in these regions have a relationship of NL ⁇ NP ⁇ NH.
- FIG. 5 is a graph showing current-voltage (IV) characteristics of the MOS transistor.
- the horizontal axis is the drain voltage (V DS ), and the vertical axis is the channel current.
- a plurality of IV curves in which the gate voltage (V GS ) is changed from near 0 V to 3.3 V are shown. As the gate voltage increases, the current value at a predetermined drain voltage increases and the IV curve rises.
- the operating point Ion4 is an operating point when the gate voltage is close to 0V (for example, 0.3V) and the drain voltage is very large as 10V, that is, when the potential difference between the gate and drain is very large as about 10V.
- the behavior at the operating point Ion4 is an index indicating the withstand voltage.
- the operating point Ion1 is an operating point when the gate voltage is 3.3V and the drain voltage is as small as 0.1V.
- the behavior at the operating point Ion1 is an index indicating on-resistance (Ron).
- the operating point Ion2 is an operating point when the gate voltage is 3.3V and the drain voltage is 3.3V
- the operating point Ion3 is an operating point when the gate voltage is 3.3V and the drain voltage is 10V. is there.
- the operating point changes on the dynamic load line.
- an operating point having a very large potential difference between the gate and the drain such as the operating point Ion4, is included.
- FIG. 6 is a graph showing a simulation result obtained by investigating the relationship between the breakdown voltage performance and the on-resistance of the MOS transistor of the first embodiment.
- the relationship between the breakdown voltage performance and the on-resistance of a comparative example transistor having a structure in which the reverse conductivity type region 8 is removed from the MOS transistor of the first embodiment is also shown.
- the horizontal axis of the graph represents the substrate voltage under the gate electrode drain end at the operating point Ion4 in V units. The lower the substrate voltage, the smaller the potential difference between the gate electrode drain end and the underlying substrate, so it can be determined that the breakdown voltage is high.
- the vertical axis of the graph represents the on-current at the operating point Ion1 in arbitrary units. The larger the on-current, the lower the on-resistance.
- the triangular plot (without p layer) is the result of the comparative example
- the rhombus plot (with p layer) is the result of the first example.
- the plot moves in the upper left direction. That is, in the embodiment, the substrate voltage under the gate electrode drain end is reduced and the breakdown voltage is improved, and the on-current is increased and the on-resistance is suppressed.
- the principle of the withstand voltage improvement in the MOS transistor of the first embodiment will be considered, and the principle that the on-resistance increase is suppressed even when the withstand voltage is improved will be considered.
- the depletion layer DL is formed by the reverse conductivity type region 8 forming a pn junction with the LDD region 4 and the HDD region 12.
- the depletion layer DL spreads as the drain voltage V DS increases. Therefore, as the drain voltage V DS increases, the potential drop due to the depletion layer DL becomes large. That is, even if the drain voltage VDS is increased, an increase in the voltage applied to the substrate below the drain end of the gate electrode is suppressed and the breakdown voltage is improved.
- the depletion layer DL Since the impurity concentration of the reverse conductivity type region 8 is higher than the impurity concentration of the LDD region 4, the depletion layer DL is more LDD than the reverse conductivity type region 8 side at the pn junction between the reverse conductivity type region 8 and the LDD region 4. It will spread to the region 4 side. In addition, since the impurity concentration of the HDD region 12 is higher than the impurity concentration of the reverse conductivity type region 8, the depletion layer DL has a reverse conductivity type than the HDD region 12 side at the pn junction between the reverse conductivity type region 8 and the HDD region 12. It will spread to the region 8 side.
- the drain voltage VDS is low, the spread of the depletion layer DL is small. Carriers can be transported through a wider cross section of the LDD region 4. Therefore, if the drain voltage VDS is low, the potential drop is small and an increase in on-resistance is suppressed.
- the left end X2 of the reverse conductivity type region 8 is arranged away from the left end X1 of the LDD region 4 toward the HDD region 12 (X1 ⁇ X2). That is, the n-type LDD region 4 is secured on the source side from the p-type reverse conductivity type region 8. As a result, the on-resistance at the time of low drain voltage can be kept low compared to the case where the left end X2 of the reverse conductivity type region 8 is arranged to reach the left end X1 of the LDD region 4.
- the left end X2 of the reverse conductivity type region 8 is closer to the source side than the right end XGD of the gate electrode 6 (X2 ⁇ XGD). That is, the reverse conductivity type region 8 is formed under the drain side end portion of the gate electrode 6.
- the reverse conductive region 8 is interposed between the drain end of the gate electrode 6 and the LDD region 4. This makes it easy to ensure a large breakdown voltage at the drain end of the gate.
- the right end XGD of the gate electrode 6 and the left end (right end of the reverse conductivity type region 8) X3 of the HDD region 12 are separated from each other (XGD ⁇ X3). That is, the drain end of the gate electrode 6 and the HDD region 12 are separated from each other.
- the right end X3 of the reverse conductivity type region 8 and the left end X4 of the drain side silicide region 15 are separated from each other (X3 ⁇ X4). That is, the reverse conductivity type region 8 and the drain side silicide region 15 do not contact each other. Thereby, when a high drain voltage is applied, extension of the depletion layer at the pn junction between the reverse conductivity type region 8 and the HDD region 12 is not hindered.
- the reverse conductivity type region 8 is covered with the silicide block insulating film 10 and is not silicided. Thereby, the extension of the depletion layer in the reverse conductivity type region 8 is not hindered.
- the reverse conductivity type region is formed in the surface region between the HDD region and the gate electrode in the LDD region.
- a depletion layer is formed by the pn junction that the reverse conductivity type region forms with the surrounding region.
- the reverse conductivity type region 8 is formed away from the drain end of the gate electrode 6 toward the HDD region 12, and does not enter under the drain end of the gate electrode 6.
- the LDD region 4 is disposed immediately below the drain end of the gate electrode 6.
- the breakdown voltage at the drain end of the gate is slightly reduced as compared with the first embodiment.
- the reverse conductivity type region 8 is not disposed immediately below the drain end of the gate electrode 6, the parasitic capacitance is reduced. Can be reduced and high-speed operation can be achieved.
- the MOS transistor of this modification is also manufactured by the same process as the manufacturing method of the MOS transistor of the first embodiment described with reference to FIGS. 1A to 3C, but the reverse conductivity described with reference to FIG. 2C.
- the forming process of the mold region 8 is different.
- p-type impurities are ion-implanted in an oblique direction so that the reverse conductivity type region 8 is formed under the gate electrode 6.
- p-type impurities are ion-implanted in an oblique direction from the opposite side of the first embodiment so that the reverse conductivity type region 8 is formed away from the gate electrode 6.
- the structure of the MOS transistor according to the second embodiment will be described with reference to FIG.
- the difference between the MOS transistor of the second embodiment and the MOS transistor of the first embodiment is that the LDD region 4 (hereinafter referred to as the first LDD region 4) is n-type.
- An LDD region 16 having a high impurity concentration (hereinafter referred to as a second LDD region 16) is formed.
- the left end of the second LDD region 16 is X5 in the horizontal direction.
- the horizontal positional relationship between the second LDD region 16 and other regions will be described.
- a second LDD region 16 is formed inside the first LDD region 4, and the left end X5 of the second LDD region 16 is closer to the drain side than the left end X1 of the first LDD region (X1 ⁇ X5).
- the HDD area 12 is formed inside the second LDD area 16, and the left end X3 of the HDD area 12 is closer to the drain side than the left end X5 of the second LDD area 16 (X5 ⁇ X3).
- the surface layer of the second LDD region 16 on the source side from the HDD region 12 is a reverse conductivity type region 8.
- the reverse conductivity type region 8 protrudes from the second LDD region 16 to the first LDD region 4, and the left end X2 of the reverse conductivity type region 8 is from the left end X5 of the second LDD region 16.
- the reverse conductivity type region 8 is formed inside the second LDD region 16, and the left end X2 of the reverse conductivity type region 8 is arranged closer to the HDD 12 than the left end X5 of the second LDD region 16 (X5). ⁇ X2) You may do it.
- the breakdown voltage and the on-resistance (where the on-resistance is expressed by the reciprocal of the operating point Ion1 in FIG. 5) are in a trade-off relationship, with a relatively good breakdown voltage when X2 ⁇ X5 and relatively when X5 ⁇ X2. Good on-resistance.
- the gates are formed in a self-aligned manner in order to avoid an increase in process steps.
- the gate electrode 6 is formed so as to overlap the second LDD region 16, and the left end X5 of the second LDD region 16 is closer to the source side than the right end XGD of the gate electrode 6 (X5 ⁇ XGD ).
- the second LDD region 16 enters the lower side of the gate in order to improve the on-resistance. Since the breakdown voltage has already been secured, it can be said that the effect of improving the breakdown voltage is not so great even if XGD ⁇ X5.
- the lower end of the second LDD region is Y4.
- the vertical positional relationship between the second LDD region 16 and other regions will be described.
- a second LDD region 16 is formed inside the first LDD region 4, and the lower end Y 4 of the second LDD region 16 is disposed away from the lower end Y 3 of the first LDD region 4. (Y4 ⁇ Y3).
- the HDD region 12 is formed inside the second LDD region 16, and the reverse conductivity type region 8 is formed on the surface of the second LDD region 16.
- the lower end Y1 of the reverse conductivity type region 8 and the lower end Y2 of the HDD 12 are disposed away from the lower end Y4 of the second LDD region 16 (Y1 ⁇ Y2 ⁇ Y4).
- the second LDD region 16 and the reverse conductivity type region 8 form an np junction.
- impurity concentration NL1 of the first LDD region 4 the impurity concentration NL2 of the second LDD region 16, the impurity concentration NP of the reverse conductivity type region 8, and the impurity concentration NH of the HDD region 12 will be described.
- impurity concentrations have a relationship of NL1 ⁇ NP ⁇ NL2 ⁇ NH.
- the impurity concentration of the second LDD region 16 is set higher than the impurity concentration of the reverse conductivity type region 8.
- the gate voltage V GS is close to 0 V (eg, 0.3 V) and the drain voltage V DS is very high (eg, 10 V) will be described with reference to FIG. 10A.
- the p-type reverse conductivity type region 8 forms a pn junction with the surrounding n-type region, and the depletion layer DL extends due to the increase of the drain voltage VDS , thereby improving the breakdown voltage.
- the impurity concentration of the second LDD region 16 is higher than the impurity concentration of the reverse conductivity type region 8
- a depletion layer is formed at the pn junction between the reverse conductivity type region 8 and the second LDD region 16. DL spreads to the reverse conductivity type region 8 side rather than the second LDD region 16 side.
- the depletion layer DL extends toward the reverse conductivity type region 8, the current path can be brought close to the surface. For this reason, an increase in parasitic resistance can be suppressed, the depth of the first LDD region 4 can be reduced, and the variation in channel length can be improved.
- the reverse conductivity type region 8 is formed so as to enter under the drain side end of the gate electrode 6, and a large breakdown voltage is generated at the drain end of the gate. Easy to secure.
- the gate voltage V GS is a certain level (for example, 3.3 V) and the drain voltage V DS is low (for example, 0.1 V) will be described with reference to FIG. 10B. Similar to the first embodiment, when the drain voltage VDS is low, the depletion layer DL has a small spread and a small potential drop, thereby suppressing an increase in on-resistance.
- the parasitic resistance is reduced, and the on-resistance is lower than that in the first embodiment. Is also expected to improve.
- the low-concentration source region 7 is covered with a resist mask RM6, and the gate electrode 6 is used as a mask, as in the first embodiment, for example, B is accelerated energy.
- Implantation is performed at 3 keV and a dose of 1E13 to reverse the conductivity type of the surface layer of the first LDD region 4 from n-type to p-type, thereby forming the reverse conductivity type region 8.
- the resist mask RM6 is removed.
- sidewall spacers 9 and silicide block insulating films 10 are formed in the same manner as described with reference to FIGS. 3A to 3C in the first embodiment, and the high concentration source region 11 and the HDD region 12 are formed. Then, a source side silicide region 13, a gate electrode silicide region 14, and a drain side silicide region 15 are formed. In the formation of the HDD region 12, n-type impurities are implanted into the reverse conductivity type region 8 and the second LDD region 16 therebelow. As described above, the MOS transistor of the second embodiment is manufactured.
- the reverse conductivity type region 8 is formed away from the drain end of the gate electrode 6 toward the HDD region 12 side. That is, it does not enter under the drain end of the gate electrode 6.
- the modification of the second embodiment can reduce parasitic capacitance and perform high-speed operation. .
- the reverse conductivity type region 8 protrudes from the second LDD region 16 to the first LDD region 4, but the reverse conductivity type region 8 is located inside the second LDD region 16.
- the source-side ends of the reverse conductivity type region 8 and the second LDD region 16 may be aligned.
- a method for manufacturing a MOS transistor according to a modification of the second embodiment will be described.
- the MOS transistor of this modification is also manufactured by the same process as that of the method of manufacturing the MOS transistor of the second embodiment.
- the reverse conductivity type region 8 has the gate electrode 6.
- a p-type impurity is ion-implanted so as to be formed away from the substrate.
- FIG. 13A is a diagram schematically showing the portable electronic device 50 of this application example.
- the portable electronic device 50 is a mobile phone, for example, and includes a transmission module 51 including a power amplifier transistor 52.
- the output of the power amplifier transistor 52 is input to the antenna 53.
- FIG. 13B is a circuit diagram showing the power amplifier transistor 52.
- the power amplifier transistor 52 the MOS transistor of the first or second embodiment is used. High-frequency input power is applied to the gate terminal 52a of the power amplifier transistor 52, and output power obtained by amplifying the input power is output from the drain terminal 52b.
- the frequency of the input and output high frequency the order of 100 MHz to the order of GHz (several hundred MHz to several GHz) is assumed.
- FIG. 13C is a graph schematically showing the amplification gain by the power amplifier transistor 52.
- the horizontal axis and vertical axis of the graph are input power and output power, respectively, expressed in dBm.
- Output power in which the amplification gain power is increased with respect to the input power is output.
- 0V and 3.3V are alternately applied to the gate terminal of the power amplifier transistor as AC input voltages, and the amplified output is supplied from the drain terminal.
- the source terminal is grounded (0 V).
- a high frequency of the order of GHz is input / output.
- the locus of change of the operating point of the power amplifier transistor is the dynamic load line.
- FIG. 14 is a graph showing a dynamic load line of the power amplifier transistor of this application example.
- the horizontal axis of the graph is the drain voltage shown in V units, and the vertical axis is the current shown in A units.
- the gate voltage V GS is 0.3V, 0.6V, 0.9V, 1.2V, 1.5V, 1.8V, 2.1V, 2.4V, 2.7V, 3.0V, and 3.3V.
- a dynamic load line DLL is shown along with a case IV curve.
- the operating point P1 is the operating point P1 having the highest drain voltage of about 7V and the gate voltage of about 0.3V, which is close to 0V.
- the operating point that captures the behavior of the power amplifier transistor in a DC manner is the bias point P0.
- the drain voltage at the operating point P1 is about 7V, more than twice that of the operating voltage of 3.3V.
- a withstand voltage performance that can withstand a potential difference between the gate and the drain of at least twice the operating voltage is required.
- the MOS transistors of the first and second embodiments are improved in breakdown voltage by forming the reverse conductivity type region 8, and are suitable for use as such a power amplifier transistor. Note that the gate insulating films of the MOS transistors of the first and second embodiments have a withstand voltage assuming an operating voltage of 3.3 V when used in direct current.
- the gate insulating film is assumed to have a withstand voltage of 3.3 V when used in a direct current, for example, for a power amplifier, etc.
- a withstand voltage performance that can withstand a high potential difference between the gate and the drain that occurs during use at high frequencies in the GHz band.
- an n-type MOS transistor as described in the above embodiment is preferable for use as a power amplifier transistor.
- a p-type MOS transistor obtained by inverting n-type and p-type in the description of the embodiment With the formation of the n-type reverse conductivity type region, the breakdown voltage is improved.
- a semiconductor device having a region having a mold and a reverse conductivity type region forming a pn junction (Appendix 2) The semiconductor device according to appendix 1, wherein the reverse conductivity type region forms a pn junction with the first low-concentration drain region. (Appendix 3) The semiconductor device according to appendix 1, wherein the reverse conductivity type region forms a pn junction with the high concentration drain region. (Appendix 4) The semiconductor device according to appendix 1, wherein an end on the source side of the reverse conductivity type region is disposed closer to the high concentration drain side than an end on the source side of the first low concentration drain region.
- the semiconductor device according to appendix 1 wherein the second low-concentration drain region is lower and the reverse conductivity type region forms a pn junction with the second low-concentration drain region.
- the impurity concentration of the reverse conductivity type region is higher than the impurity concentration of the first low concentration drain region
- the impurity concentration of the second low concentration drain region is higher than the impurity concentration of the reverse conductivity type region
- the second low concentration region The semiconductor device according to appendix 10, wherein the impurity concentration of the high concentration drain region is higher than the impurity concentration of the concentration drain region.
- Appendix 12 The semiconductor device according to appendix 1, wherein the first conductivity type is p-type and the second conductivity type is n-type.
- (Appendix 15) (A) preparing a semiconductor substrate having a first region of a first conductivity type; (B) forming a first low-concentration drain region having a second conductivity type opposite to the first conductivity type in the first region; (C) forming a gate insulating film on the first region and the first low-concentration drain region; (D) forming a gate electrode on the gate insulating film so as to overlap both the first region and the first low-concentration drain region; (E) implanting an impurity for determining the first conductivity type into a surface layer of the first low-concentration drain region to form a reverse conductivity type region having the first conductivity type; (F) forming an insulating film formed above the first low-concentration drain region, covering a side wall of the gate electrode on the first low-concentration drain region side, and extending to a part above the reverse conductivity type region; Process, (G) Using the insulating film as a mask, an impurity for determining the second conductivity type is
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Abstract
Description
August 2001が開示するn型MOSトランジスタの断面図(同文献Fig.1の(a))である。
(付記1)
第1導電型の第1領域を有する半導体基板と、
前記第1領域上に形成されたゲート絶縁膜と、
前記ゲート絶縁膜上に形成されたゲート電極と、
前記第1領域内において、前記ゲート電極に対し一方の側に形成され、前記第1導電型と反対の第2導電型を有するソース領域と、
前記第1領域内において、前記ゲート電極に対し他方の側に、前記ソース領域側の端が該ゲート電極の下方に入り込んで形成され、前記第2導電型を有する第1低濃度ドレイン領域と、
前記第1低濃度ドレイン領域内において、前記ゲート電極から離れて形成され、前記第2導電型を有し、該第1低濃度ドレイン領域よりも不純物濃度が高い高濃度ドレイン領域と、
前記第1低濃度ドレイン領域内において、前記高濃度ドレイン領域と前記ゲート電極の間の表面領域に形成され、前記第1導電型を有し、該第1低濃度ドレイン領域内の前記第2導電型を有する領域とpn接合を形成する逆導電型領域と
を有する半導体装置。
(付記2)
前記逆導電型領域は、前記第1低濃度ドレイン領域とpn接合を形成する付記1に記載の半導体装置。
(付記3)
前記逆導電型領域は、前記高濃度ドレイン領域とpn接合を形成する付記1に記載の半導体装置。
(付記4)
前記逆導電型領域の前記ソース側の端が、前記第1低濃度ドレイン領域の前記ソース側の端よりも前記高濃度ドレイン側に配置されている付記1に記載の半導体装置。
(付記5)
前記逆導電型領域の前記ソース側の端が、前記ゲート電極の下方に入り込んで形成されている付記1に記載の半導体装置。
(付記6)
さらに、前記高濃度ドレイン領域の表面に形成されたシリサイド領域を有し、該シリサイド領域の前記ソース側の端が、前記逆導電型領域の該高濃度ドレイン領域側の端から離れている付記1に記載の半導体装置。
(付記7)
さらに、前記シリサイド領域を露出させ、前記逆導電型領域を覆うように形成された絶縁膜を有する付記6に記載の半導体装置。
(付記8)
前記逆導電型領域の不純物濃度が、前記第1低濃度ドレイン領域の不純物濃度よりも高く、前記高濃度ドレイン領域の不純物濃度よりも低い付記1に記載の半導体装置。
(付記9)
前記逆導電型領域の前記ソース側の端が、前記ゲート電極の該第1低濃度ドレイン領域側の端から、前記高濃度ドレイン領域側に離れて形成されている付記1に記載の半導体装置。
(付記10)
さらに、前記第1低濃度ドレイン領域内に形成され、前記第2導電型を有し、不純物濃度が、該第1低濃度ドレイン領域の不純物濃度よりも高く、前記高濃度ドレイン領域の不純物濃度よりも低い第2低濃度ドレイン領域を有し、前記逆導電型領域が、該第2低濃度ドレイン領域とpn接合を形成する付記1に記載の半導体装置。
(付記11)
前記第1低濃度ドレイン領域の不純物濃度よりも前記逆導電型領域の不純物濃度が高く、前記逆導電型領域の不純物濃度よりも前記第2低濃度ドレイン領域の不純物濃度が高く、前記第2低濃度ドレイン領域の不純物濃度よりも前記高濃度ドレイン領域の不純物濃度が高い付記10に記載の半導体装置。
(付記12)
前記第1導電型はp型であり、前記第2導電型はn型である付記1に記載の半導体装置。
(付記13)
前記ゲート電極に高周波の入力電力が印加され、前記ドレイン領域は、該ゲート電極に印加された該入力電力を増幅した高周波の出力電力を出力し、携帯電子機器である付記1に記載の半導体装置。
(付記14)
前記ゲート絶縁膜の材料及び厚さに対応して、前記ゲート電極と前記ドレイン領域との間に直流電圧が印加されたときの耐圧が想定され、
前記ゲート電極に高周波の入力電力が印加され、前記ドレイン領域は、該ゲート電極に印加された該入力電力を増幅した高周波の出力電力を出力し、該出力電力の出力時に該ドレイン領域にかかるドレイン電圧の最大値が、前記耐圧の2倍以上である付記1に記載の半導体装置。
(付記15)
(a)第1導電型の第1領域を有する半導体基板を準備する工程と、
(b)前記第1領域内に、前記第1導電型と反対の第2導電型を有する第1低濃度ドレイン領域を形成する工程と、
(c)前記第1領域及び前記第1低濃度ドレイン領域の上に、ゲート絶縁膜を形成する工程と、
(d)前記ゲート絶縁膜の上に、前記第1領域及び前記第1低濃度ドレイン領域の双方に重なりを持つように、ゲート電極を形成する工程と、
(e)前記第1低濃度ドレイン領域の表層に、前記第1導電型を決定する不純物を注入し、該第1導電型を有する逆導電型領域を形成する工程と、
(f)前記第1低濃度ドレイン領域の上方に形成され、前記ゲート電極の該第1低濃度ドレイン領域側の側壁を覆い、前記逆導電型領域一部上方まで延在する絶縁膜を形成する工程と、
(g)前記絶縁膜をマスクとして、前記逆導電型領域及びその下方の前記第1低濃度ドレイン領域に、前記第2導電型を決定する不純物を注入し、該第2導電型を有し、該第1低濃度ドレイン領域よりも不純物濃度が高い高濃度ドレイン領域を形成する工程と、
(h)前記ゲート電極に対し、前記第1低濃度ドレイン領域と反対側の前記第1領域内に、前記第2導電型を有するソース領域を形成する工程と
を有する半導体装置の製造方法。
(付記16)
さらに、(i)前記工程(e)と前記工程(f)との間に、該逆導電型領域の下方の前記第1低濃度ドレイン領域内に、前記第2導電型を決定する不純物を注入し、該第1低濃度ドレイン領域よりも不純物濃度が高い第2低濃度ドレイン領域を形成する工程を有し、前記工程(g)は、前記逆導電型領域及びその下の前記第2低濃度ドレイン領域に、前記第2導電型を決定する不純物を注入し、該第2低濃度ドレイン領域よりも不純物濃度が高い高濃度ドレイン領域を形成する付記15に記載の半導体装置の製造方法。
(付記17)
さらに、(j)前記高濃度ドレイン領域の表層をシリサイド化する工程を有する付記15に記載の半導体装置の製造方法。
Claims (10)
- 第1導電型の第1領域を有する半導体基板と、
前記第1領域上に形成されたゲート絶縁膜と、
前記ゲート絶縁膜上に形成されたゲート電極と、
前記第1領域内において、前記ゲート電極に対し一方の側に形成され、前記第1導電型と反対の第2導電型を有するソース領域と、
前記第1領域内において、前記ゲート電極に対し他方の側に、前記ソース領域側の端が該ゲート電極の下方に入り込んで形成され、前記第2導電型を有する第1低濃度ドレイン領域と、
前記第1低濃度ドレイン領域内において、前記ゲート電極から離れて形成され、前記第2導電型を有し、該第1低濃度ドレイン領域よりも不純物濃度が高い高濃度ドレイン領域と、
前記第1低濃度ドレイン領域内において、前記高濃度ドレイン領域と前記ゲート電極の間の表面領域に形成され、前記第1導電型を有し、該第1低濃度ドレイン領域内の前記第2導電型を有する領域とpn接合を形成する逆導電型領域と
を有する半導体装置。 - 前記逆導電型領域の前記ソース側の端が、前記第1低濃度ドレイン領域の前記ソース側の端よりも前記高濃度ドレイン側に配置されている請求項1に記載の半導体装置。
- 前記逆導電型領域の前記ソース側の端が、前記ゲート電極の下方に入り込んで形成されている請求項1に記載の半導体装置。
- 前記逆導電型領域の前記ソース側の端が、前記ゲート電極の該第1低濃度ドレイン領域側の端から、前記高濃度ドレイン領域側に離れて形成されている請求項1に記載の半導体装置。
- さらに、前記第1低濃度ドレイン領域内に形成され、前記第2導電型を有し、不純物濃度が、該第1低濃度ドレイン領域の不純物濃度よりも高く、前記高濃度ドレイン領域の不純物濃度よりも低い第2低濃度ドレイン領域を有し、前記逆導電型領域が、該第2低濃度ドレイン領域とpn接合を形成する請求項1に記載の半導体装置。
- 前記第1低濃度ドレイン領域の不純物濃度よりも前記逆導電型領域の不純物濃度が高く、前記逆導電型領域の不純物濃度よりも前記第2低濃度ドレイン領域の不純物濃度が高く、前記第2低濃度ドレイン領域の不純物濃度よりも前記高濃度ドレイン領域の不純物濃度が高い請求項5に記載の半導体装置。
- 前記ゲート電極に高周波の入力電力が印加され、前記ドレイン領域は、該ゲート電極に印加された該入力電力を増幅した高周波の出力電力を出力し、携帯電子機器である請求項1に記載の半導体装置。
- 前記ゲート絶縁膜の材料及び厚さに対応して、前記ゲート電極と前記ドレイン領域との間に直流電圧が印加されたときの耐圧が想定され、
前記ゲート電極に高周波の入力電力が印加され、前記ドレイン領域は、該ゲート電極に印加された該入力電力を増幅した高周波の出力電力を出力し、該出力電力の出力時に該ドレイン領域にかかるドレイン電圧の最大値が、前記耐圧の2倍以上である請求項1に記載の半導体装置。 - (a)第1導電型の第1領域を有する半導体基板を準備する工程と、
(b)前記第1領域内に、前記第1導電型と反対の第2導電型を有する第1低濃度ドレイン領域を形成する工程と、
(c)前記第1領域及び前記第1低濃度ドレイン領域の上に、ゲート絶縁膜を形成する工程と、
(d)前記ゲート絶縁膜の上に、前記第1領域及び前記第1低濃度ドレイン領域の双方に重なりを持つように、ゲート電極を形成する工程と、
(e)前記第1低濃度ドレイン領域の表層に、前記第1導電型を決定する不純物を注入し、該第1導電型を有する逆導電型領域を形成する工程と、
(f)前記第1低濃度ドレイン領域の上方に形成され、前記ゲート電極の該第1低濃度ドレイン領域側の側壁を覆い、前記逆導電型領域一部上方まで延在する絶縁膜を形成する工程と、
(g)前記絶縁膜をマスクとして、前記逆導電型領域及びその下方の前記第1低濃度ドレイン領域に、前記第2導電型を決定する不純物を注入し、該第2導電型を有し、該第1低濃度ドレイン領域よりも不純物濃度が高い高濃度ドレイン領域を形成する工程と、
(h)前記ゲート電極に対し、前記第1低濃度ドレイン領域と反対側の前記第1領域内に、前記第2導電型を有するソース領域を形成する工程と
を有する半導体装置の製造方法。 - さらに、(i)前記工程(e)と前記工程(f)との間に、該逆導電型領域の下方の前記第1低濃度ドレイン領域内に、前記第2導電型を決定する不純物を注入し、該第1低濃度ドレイン領域よりも不純物濃度が高い第2低濃度ドレイン領域を形成する工程を有し、前記工程(g)は、前記逆導電型領域及びその下の前記第2低濃度ドレイン領域に、前記第2導電型を決定する不純物を注入し、該第2低濃度ドレイン領域よりも不純物濃度が高い高濃度ドレイン領域を形成する請求項9に記載の半導体装置の製造方法。
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JP2009548805A JP5158095B2 (ja) | 2008-01-10 | 2008-01-10 | 半導体装置及びその製造方法 |
CN2008801246016A CN101911302B (zh) | 2008-01-10 | 2008-01-10 | 半导体器件及其制造方法 |
US12/797,078 US8410550B2 (en) | 2008-01-10 | 2010-06-09 | Breakdown voltage MOS semiconductor device |
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CN106298923B (zh) * | 2015-06-02 | 2020-10-09 | 联华电子股份有限公司 | 高压金属氧化物半导体晶体管元件以及其制造方法 |
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