WO2009122609A1 - 半導体装置、その製造方法及び表示装置 - Google Patents
半導体装置、その製造方法及び表示装置 Download PDFInfo
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- H01L21/18—Manufacture or treatment of semiconductor devices or of parts thereof the devices having potential barriers, e.g. a PN junction, depletion layer or carrier concentration layer the devices having semiconductor bodies comprising elements of Group IV of the Periodic Table or AIIIBV compounds with or without impurities, e.g. doping materials
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- H01L27/00—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate
- H01L27/02—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components specially adapted for rectifying, oscillating, amplifying or switching and having potential barriers; including integrated passive circuit elements having potential barriers
- H01L27/12—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components specially adapted for rectifying, oscillating, amplifying or switching and having potential barriers; including integrated passive circuit elements having potential barriers the substrate being other than a semiconductor body, e.g. an insulating body
- H01L27/1214—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components specially adapted for rectifying, oscillating, amplifying or switching and having potential barriers; including integrated passive circuit elements having potential barriers the substrate being other than a semiconductor body, e.g. an insulating body comprising a plurality of TFTs formed on a non-semiconducting substrate, e.g. driving circuits for AMLCDs
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- H01L27/1274—Multistep manufacturing methods with a particular formation, treatment or patterning of the active layer specially adapted to the circuit arrangement using crystallisation of amorphous semiconductor or recrystallisation of crystalline semiconductor
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Definitions
- the present invention relates to a semiconductor device, a manufacturing method thereof, and a display device. More specifically, the present invention relates to a semiconductor device suitable for a small-sized display device such as a mobile phone, a digital camera, and a vehicle, a manufacturing method thereof, and a display device.
- a semiconductor device is an electronic device that includes an active element that utilizes electrical characteristics of a semiconductor, and is widely applied to, for example, audio equipment, communication equipment, computers, and home appliances.
- a semiconductor device including a thin film transistor (TFT) is widely applied to a pixel switching element, a driver circuit, and the like in an active matrix liquid crystal display device.
- TFT thin film transistor
- Silicon used for a semiconductor layer of a TFT is classified into amorphous silicon having low crystallinity (amorphous silicon) and polycrystalline silicon having high crystallinity (polysilicon) depending on the difference in crystallinity.
- amorphous silicon has the advantage of being inexpensive and easy to form, and easy to form on non-crystalline materials and materials that cannot withstand high temperatures, but has the disadvantage of low mobility. is there.
- polycrystalline silicon has a mobility about two orders of magnitude higher than that of amorphous silicon. By using polycrystalline silicon for a semiconductor layer, it is possible to improve performance such as TFT operation speed. .
- TFTs including polycrystalline silicon have excellent mobility, but there is room for improvement in that the leak current between the source and drain is large.
- a technique for reducing a leakage current by forming an LDD (Lightly Doped Drain) region which is a low concentration impurity region between a source / drain region and a channel region is disclosed (for example, see Patent Document 1). .) JP-A-8-167722
- the source / drain regions are formed by ion-implanting high dose impurities into the semiconductor layer and then activating the implanted impurities with heat or the like. It is possible to recover the crystal structure of the source / drain regions destroyed by the ion implantation damage due to the activation.
- ion implantation is unintentionally excessive. When it is performed or when the activation variation occurs, the crystal recovery of the source / drain region due to the activation may be insufficient.
- the present invention has been made in view of the above circumstances, a semiconductor device capable of suppressing the I on failure caused by the on-current decreases, it is an object to provide a manufacturing method thereof and a display device .
- the inventors of the present invention have made various studies on a semiconductor device, a method for manufacturing the same, and a display device that can reduce the Ion defect due to a decrease in on-current. As a result, the starting point of crystal recovery in the source / drain region at the time of activation. Pay attention. The inventor first clarified the following points regarding the conventional semiconductor device.
- crystal recovery in the source / drain region at the time of activation proceeds when the region with little crystal breakdown (high crystallinity) exists, and the crystallinity of the region that is the starting point is high.
- the higher the rate the higher the activation rate. Therefore, when ion-implanting a high dose of impurities, the acceleration voltage is adjusted to minimize the number of impurity ions reaching the semiconductor layer on the substrate side and form a region with little crystal breakdown in the semiconductor layer on the substrate side. It is effective to increase the activation rate and promote crystal recovery.
- FIG. 8 is a schematic cross-sectional view showing the vicinity of a source / drain region of a TFT provided in a conventional semiconductor device.
- FIG. 8A shows a state at the time of ion implantation of a high dose impurity
- FIG. It is the state at the time of conversion. As shown in FIG.
- a high dose amount of impurity 9 is ion-implanted through the gate insulating film 3 into the crystalline semiconductor layer 2 on the substrate 1 to obtain a gate.
- Ions are implanted into the crystalline semiconductor layer 2 in the region excluding the region where the electrode 4 overlaps. Therefore, ion implantation is not performed on the channel region 5 below the gate electrode 4, but ion implantation is performed on the region of the crystalline semiconductor layer 2 that becomes the source / drain region 6.
- the difference in density in the source / drain region 6 indicates a difference in crystallinity. The darker the color, the more the crystal breakage proceeds and the lower the crystallinity.
- the degree of crystal breakdown of the source / drain region 6 is determined by the substrate. It gradually increases from the 1 side toward the gate insulating film 3 side. That is, crystal breakdown is most advanced in a region adjacent to the gate insulating film 3 in the source / drain region 6 and the crystallinity is lowered. On the other hand, in the region adjacent to the substrate 1 in the source / drain region 6, there is little crystal breakdown and the crystallinity is high.
- crystal recovery of the source / drain region 6 occurs.
- crystal recovery proceeds from a region having high crystallinity. That is, in the conventional semiconductor device shown in FIG. 8B, the region adjacent to the substrate 1 in the source / drain region 6 becomes the main starting point of crystal recovery, and the crystal recovery proceeds in the direction of the white arrow.
- the crystal breakdown in the crystalline semiconductor layer 2 becomes large due to variations in the implanted impurities, the crystal recovery of the source / drain region 6 becomes insufficient, and the sheet resistance of the source / drain region 6 becomes insufficient. Will increase. Further, the contact resistance between the source / drain region 6 and the wiring 10 increases due to the increase in sheet resistance. As a result, the on-resistance of the semiconductor device increases, resulting in I on failure due to a decrease in on-current.
- a low concentration impurity region is disposed adjacent to the source / drain region, and the crystal recovery point when the low concentration impurity region having high crystallinity is activated is activated. As a result, it was thought that crystal recovery, which was insufficient in the past, may be promoted.
- FIG. 9A shows a state of observation of polysilicon before activation with an optical microscope
- FIG. 9B is a graph showing a Raman spectrum before activation.
- FIG. 11A shows the state of amorphous silicon observed with an optical microscope
- FIG. 11B is a graph showing the Raman spectrum of amorphous silicon.
- high dose impurities are ion-implanted into the polysilicon 20, and an ion-implanted region 21 is formed in a square region indicated by a dotted line having a side of approximately 20 ⁇ m. That is, the ion implantation region 21 corresponds to a source / drain region having a large crystal breakdown in a semiconductor device.
- the region surrounding the ion implantation region 21 was the ion non-implantation region 17 where ion implantation was not performed.
- the P point which is the approximate center of the ion implantation region 21 and the L point of the ion non-implantation region 17 in FIG. 9A are measured by Raman spectroscopy. Comparison was made with the result of amorphous silicon 23 shown in FIG. As shown in FIG. 9B, the Raman spectrum at the Q point is a pattern showing a high crystalline silicon peak in the vicinity of 520 cm ⁇ 1 , whereas the Raman spectrum at the P point is the amorphous spectrum shown in FIG. Since it is a broad pattern similar to the Raman spectrum of silicon 23, it was confirmed that crystal breakdown occurred in the ion implantation region 21 into which a high dose of impurities was ion-implanted.
- FIG. 10A is a state of observation of the polysilicon after activation with an optical microscope
- FIG. 10B is a graph showing a Raman spectrum of the polysilicon after activation.
- the dark region in the ion implanted region 21 decreased due to activation.
- a P point that is substantially the center of the ion implantation region 21, an S point that is an ion implantation region 21 approximately 2 ⁇ m inside from the ion non-implantation region 17, and an R point that is intermediate between the P point and the S point are identified by Raman.
- the Raman spectrum at the P point and the R point has a broad pattern similar to the Raman spectrum of the amorphous silicon 23 in FIG. 11 (b) and around 520 cm ⁇ 1.
- the Raman spectrum at the S point is close to the Raman spectrum at the Q point in FIG. 9 (b), and is crystalline near 520 cm ⁇ 1. It showed a high silicon peak.
- the present inventors have arranged a low-concentration impurity region adjacent to the source / drain region, and added this low-concentration impurity region as a starting point for crystal recovery at the time of activation. It has been found that the crystal recovery of the region is promoted, and that the crystal recovery can be sufficiently performed even in the source / drain regions, where the crystal recovery has been insufficient in the past, and the above problems can be solved brilliantly.
- the present invention has been achieved.
- the present invention is a semiconductor device including a thin film transistor having a crystalline semiconductor layer including a channel region and a source / drain region on a substrate, and a wiring connected to the source / drain region.
- the semiconductor layer includes a low-concentration impurity region having an impurity concentration lower than that of the source / drain region, and a contact portion in contact with the wiring, and the low-concentration impurity region is the source in a region excluding the channel region side.
- Crystal recovery of the source / drain regions during activation occurs regardless of the presence or absence of the gradient of crystal breakdown (crystal defects), but if there is a region with less crystal breakdown, crystal recovery is promoted starting from that region. The At this time, the smaller the crystal breakage in the starting region, the stronger the effect of promoting crystal recovery. Therefore, according to the present invention, in the source / drain region at the time of activation, not only the crystal recovery from the region where the crystal breakdown of the source / drain region is small (for example, the substrate side of the source / drain region), but also the source / drain region. Since crystal recovery from the low-concentration impurity region adjacent to the region occurs, the crystal recovery of the source / drain region is strongly promoted compared to the conventional case.
- the crystal recovery of the source / drain region at the time of activation can be sufficiently advanced, the sheet resistance of the source / drain region can be reduced, and the contact resistance between the source / drain region and the wiring can be reduced.
- by reducing the contact resistance between the source / drain regions and the wiring it is possible to suppress the occurrence of contact failure.
- the source / drain region is a region functioning as a source and / or drain of a TFT. That is, the thin film transistor (crystalline semiconductor layer) usually has two source / drain regions opposed to each other with a channel region interposed therebetween. When one source / drain region functions as a source, The drain region functions as a drain. Further, since the low concentration impurity region is disposed adjacent to the source / drain region except for the channel region side, it can be distinguished from the LDD region by the region to be disposed.
- the configuration of the semiconductor device of the present invention is not particularly limited as long as such a component is formed as an essential component, and may or may not include other components. .
- a preferred embodiment of the semiconductor device of the present invention will be described in detail below. In addition, you may use the form shown below suitably combining.
- the low-concentration impurity region is a region where ion implantation of an impurity with a high dose equivalent to that of the source / drain region is not performed, and a low dose impurity may be added, or an impurity is added. It may be a non-ion-implanted region. More specifically, the low concentration impurity region is preferably a region having an impurity concentration of 50% or less (more preferably 10% or less) of the impurity concentration of the source / drain region. Thereby, the crystallinity of the low concentration impurity region can be increased, and the effect of promoting the crystal recovery of the source / drain region starting from the low concentration impurity region can be enhanced. Note that if the impurity concentration of the low-concentration impurity region exceeds 50%, the low-concentration impurity region may not be able to fully exhibit the effect as a starting point of crystal recovery.
- the low-concentration impurity regions may be arranged in the vertical direction (film thickness direction) of the source / drain regions if possible, but are preferably arranged on the same plane as the source / drain regions. Accordingly, the low concentration impurity region can be easily formed by using a photoresist or the like.
- a part of the contact portion may overlap with the low concentration impurity region.
- the low-concentration impurity region may be disposed along the outer periphery of the contact portion excluding the channel region side when the substrate is viewed in plan. Thereby, since the crystal recovery of the source / drain regions around the contact portion can be efficiently promoted, the contact resistance can be further reduced, and the contact failure and the Ion failure can be further suppressed. From the same viewpoint, the low-concentration impurity region may have a shape (for example, a concave shape) having a dent when the substrate is viewed in plan, and the dent portion may be arranged along the outer periphery of the contact portion.
- the low concentration impurity region may be arranged along a current path between the contact portion and the channel region when the substrate is viewed in plan.
- the crystal recovery of the source / drain region around the current path between the contact portion and the channel region can be promoted, so that the sheet of the source / drain region serving as the current path between the contact portion and the channel region is provided.
- the I on failure can be further suppressed.
- the thin film transistor usually has two contact portions arranged opposite to each other with a channel region interposed therebetween, and a current (on-current) flows between the two contact portions. That is, a current path is formed between the two contact portions.
- the crystalline semiconductor layer has at least two contact portions arranged to face each other with the channel region interposed therebetween, and the low concentration impurity region is obtained when the substrate is viewed in plan view. It may be arranged along a region sandwiched between contact portions facing each other across the channel region.
- the low-concentration impurity region is disposed along a current path between the contact portion and the channel region when the substrate is viewed in plan, and along the outer periphery of the contact portion except for the channel region side. May be arranged.
- the crystal recovery of the source / drain region around the current path between the contact portion and the channel region can be promoted, so that the sheet of the source / drain region serving as the current path between the contact portion and the channel region is provided. Resistance can be reduced.
- the contact resistance can be further reduced. From the above, further reduce the on-resistance of the semiconductor device, it is possible to further suppress the I on failure.
- the crystalline semiconductor layer has at least two contact portions arranged to face each other with the channel region interposed therebetween, and the low-concentration impurity region has a channel region when the substrate is viewed in plan view. It may be disposed along a region sandwiched between contact portions opposed to each other, and may be disposed along the outer periphery of the contact portion excluding the channel region side.
- the semiconductor device may have a resist over the gate insulating film in a region overlapping with the low concentration impurity region.
- the thin film transistor may include a gate insulating film
- the semiconductor device may include a resist on the gate insulating film in a region overlapping with the low concentration impurity region.
- the resist may be a resist residue left after the resist is removed in the manufacturing process, that is, a resist residue.
- the degree of resist remaining (for example, the film thickness of the resist residue) can be controlled by appropriately selecting the resist material, removal method, and the like.
- the gate insulating film in the region overlapping with the low-concentration impurity region is continuous with the gate insulating film in the region overlapping with the source / drain region, and at least the film thickness and film quality of the gate insulating film in the region overlapping with the source / drain region.
- the thin film transistor includes the gate insulating film, and the gate insulating film is continuous with the region overlapping the source / drain region, and the low concentration impurity region has a region overlapping the low concentration impurity region. At least one of the film thickness and the film quality in the overlapping region and the region overlapping the source / drain region may be different.
- the concentration of the impurity added to the crystalline semiconductor layer can be adjusted using at least one of the film thickness difference and the film quality difference of the continuous gate insulating film. Therefore, a low concentration impurity region can be easily formed in the crystalline semiconductor layer in a region overlapping with the gate insulating film in a region having at least one of a film thickness difference and a film quality difference.
- the gate insulating film in the region overlapping with the low-concentration impurity region is a denser film than the gate insulating film in the region overlapping with the source / drain regions (for example, the amount of structural defects is small).
- Such a form can be formed by changing film forming conditions such as temperature, gas flow rate, and applied voltage for each region.
- a plurality of insulating films may be stacked in the gate insulating film in the region overlapping with the low concentration impurity region.
- the thin film transistor may include a gate insulating film
- the gate insulating film in a region overlapping with the low-concentration impurity region may include a plurality of stacked insulating films.
- the gate insulating film easily has a thickness difference, and the concentration of impurities added to the crystalline semiconductor layer can be easily adjusted using the thickness difference of the gate insulating film. Therefore, a low concentration impurity region can be easily formed in the crystalline semiconductor layer in a region overlapping with a region where the gate insulating film is thick (a region where a plurality of insulating films are stacked).
- the present invention is also a method for manufacturing a semiconductor device according to the present invention, wherein the manufacturing method patterns a resist on a gate insulating film in a region overlapping the region where the low-concentration impurity region of the crystalline semiconductor layer is formed. And a step of adding an impurity to the crystalline semiconductor layer through the gate insulating film using the resist as a mask.
- the low concentration impurity region can be easily formed in the crystalline semiconductor layer in the region masked by the resist without increasing the number of steps as compared with the aspect using the film thickness difference of the gate insulating film.
- the present invention further relates to a method of manufacturing a semiconductor device of the present invention, wherein the manufacturing method includes a step of patterning a first gate insulating film on a region where the low concentration impurity region of the crystalline semiconductor layer is formed. Forming a second gate insulating film so as to cover the crystalline semiconductor layer and the first gate insulating film, and introducing impurities into the crystalline semiconductor layer through the first gate insulating film and the second gate insulating film. And a step of adding the semiconductor device.
- a gate insulating film having a structure having a difference in film thickness can be easily formed. Therefore, the concentration of impurities added to the crystalline semiconductor layer can be easily adjusted using the difference in film thickness of the gate insulating film.
- a low concentration impurity region can be easily formed in the crystalline semiconductor layer in a region overlapping with a region where the gate insulating film is thick (a region where the first gate insulating film and the second gate insulating film are stacked).
- the method for manufacturing a semiconductor device of the present invention is not particularly limited as long as it includes the above-described steps as essential steps, and may or may not include other steps.
- an ion implantation method As a method for adding impurities to the crystalline semiconductor layer, an ion implantation method, an ion doping method, or the like can be used. From the viewpoint of easy control of the amount of impurities added and the depth profile of the added impurities. It is preferable to use an ion implantation method.
- the present invention is also a display device including the semiconductor device of the present invention or the semiconductor device manufactured by the method of manufacturing a semiconductor device of the present invention. Accordingly, since a semiconductor device capable of suppressing Ion defects can be used for a display device, a display device with high yield rate, high reliability, and low power consumption can be realized.
- the semiconductor device and the display device of the present invention it is possible to provide a semiconductor device, a method for manufacturing the display device, and a display device that can suppress an Ion defect due to a decrease in on-current.
- FIG. 1 is a schematic cross-sectional view showing the vicinity of a source / drain region of a TFT provided in the semiconductor device of Embodiment 1, wherein (a) shows a state at the time of ion implantation of a high dose impurity, and (b) This is the state when activated.
- the shades of color in the source / drain regions 6 in FIGS. 1A and 1B show the difference in crystallinity, and the darker the region, the more the crystal breakage proceeds and the lower the crystallinity.
- FIG. 8 in the semiconductor device of the first embodiment shown in FIG.
- FIG. 2 is a schematic plan view showing the vicinity of the source / drain region of the TFT provided in the semiconductor device of the first embodiment.
- the semiconductor device of this embodiment includes a crystalline semiconductor layer 2 having a channel region 5, a source / drain region 6 and a low-concentration impurity region 7 on a substrate 1, and a gate insulating film. 3 and the gate electrode 4 are provided with a TFT having a structure in which the substrate 1 is laminated in this order. Further, as shown in FIG.
- the semiconductor device of the present invention is a region surrounded by a dotted line in FIG. 1B connected to a source / drain region 6 through a contact hole. ).
- the channel region 5, the source / drain region 6 and the low-concentration impurity region 7 are formed from the same semiconductor layer and are arranged adjacent to each other in the same plane.
- an island-shaped crystalline semiconductor layer 2 having a thickness of 20 to 200 nm (preferably 30 to 70 nm) is formed on one main surface of the substrate 1. More specifically, the crystalline semiconductor layer 2 is formed by forming an amorphous semiconductor film having an amorphous structure by sputtering, LPCVD (Low Pressure CVD), or plasma CVD (Chemical Vapor Deposition). It is formed by patterning a crystalline semiconductor film obtained by crystallization by laser into a desired shape by a photolithography process.
- the material of the crystalline semiconductor layer 2 is not particularly limited, but is preferably silicon. That is, the crystalline semiconductor layer 2 is preferably polysilicon.
- CG silicon film a continuous grain boundary crystalline silicon film
- the material of the substrate 1 is not particularly limited, and a glass substrate, a quartz substrate, a silicon substrate, a substrate in which an insulating film is formed on the surface of a metal plate or a stainless plate, a plastic substrate having heat resistance that can withstand a processing temperature, and the like.
- a glass substrate used for a display device such as a liquid crystal display device is preferable.
- an underlayer may be formed between the substrate 1 and the crystalline semiconductor layer 2.
- an insulating film containing silicon eg, SiO 2 , SiN, SiNO
- the base layer may have a structure in which two or more insulating films are stacked.
- a gate insulating film 3 having a thickness of 20 to 200 nm (preferably 30 to 120 nm) is formed.
- an insulating film containing silicon for example, a SiO 2 film, a SiN film, or a SiNO film
- the gate insulating film 3 may have a structure in which two or more insulating films made of a plurality of insulating materials are stacked in addition to a single layer structure.
- impurities such as boron (B) having a low dose may be ion-implanted into the crystalline semiconductor layer 2.
- a gate electrode 4 having a thickness of 50 to 600 nm (preferably 100 to 500 nm) is formed. More specifically, after forming the conductive film by sputtering, the gate electrode 4 is formed by patterning the conductive film into a desired shape by a photolithography process.
- the material of the gate electrode 4 is a refractory metal such as tantalum (Ta), tungsten (W), titanium (Ti), molybdenum (Mo), or an alloy material or a compound material containing these refractory metals as a main component. Is preferred.
- a nitride is suitable as the compound mainly composed of a refractory metal. Note that the gate electrode 4 may have a structure in which conductive films formed using these materials are stacked.
- a photoresist (resist) 8 is patterned on the gate insulating film 3 in a region overlapping the region where the low-concentration impurity region 7 is formed, and then the photoresist. 8 is used as a mask to ion-implant high dose impurities 9 into the crystalline semiconductor layer 2 through the gate insulating film 3 and then activate the source / drain regions 6 and the low-concentration impurity regions 7. Formed on the crystalline semiconductor layer 2.
- the dose amount is 5 ⁇ 10 14 to 1 ⁇ 10 16 cm ⁇ 2 (preferably 5 ⁇ 10 14 to 5 Ion implantation of phosphorus (P), boron (B), etc. of ⁇ 10 15 cm ⁇ 2 ) as impurities 9 is performed.
- the peak of the depth profile 12 of the implanted impurity 9 exists from the gate insulating film 3 to the region of the source / drain region 6 on the gate insulating film 3 side.
- the crystal breakdown is most advanced in the region adjacent to the gate insulating film 3 in the source / drain region 6 and the crystallinity is lowered.
- FIG. 18 is a schematic cross-sectional view showing the vicinity of the source / drain region of the TFT provided in the semiconductor device of the first embodiment in which a high dose of impurities is ion-implanted under different conditions.
- reference numerals are omitted for members that are not used in the description.
- Impurities such as light ions (boron (B), etc.) that do not need to reduce the sheet resistance of the source / drain region 6 so much or that cause little crystal breakage and are less prone to crystal recovery of the source / drain region 6 during activation.
- the peak of the depth profile 12 of the implanted impurity 9 is the source / drain as shown in FIG. Ion implantation may be performed under such conditions as exist from the region 6 to the substrate 1.
- heating is performed at 350 to 720 ° C. (preferably 400 to 700 ° C.) for 4 to 240 minutes to activate the impurity 9 implanted into the crystalline semiconductor layer 2 and recover the crystal of the crystalline semiconductor layer 2.
- the source / drain regions 6 and the low-concentration impurity regions 7 are formed in the crystalline semiconductor layer 2.
- the photoresist 8 is preferably removed after the ion implantation, a residue (resist residue) of the photoresist 8 may exist on the gate insulating film 3 in a region overlapping with the low concentration impurity region 7.
- the crystalline semiconductor layer 2 in the region masked by the photoresist 8 can be specified. 7 can be easily inspected and analyzed for shape, alignment accuracy, and the like.
- the crystalline semiconductor layer 2 in the region masked by the photoresist 8 is not ion-implanted with the impurity 9 described above, so that the low-concentration impurity region 7 formed using the photoresist 8 has a TFT threshold.
- a low dose impurity for the purpose of controlling the value voltage is not ion-implanted, it becomes an ion non-implanted region.
- the semiconductor device of this embodiment can be manufactured through a process of forming the interlayer insulating film and the wiring 10.
- a material for the interlayer insulating film an insulating film containing silicon (for example, a SiO 2 film, a SiN film, or a SiNO film) formed by a plasma CVD method or a sputtering method can be preferably used.
- a low resistance metal such as aluminum (Al), copper (Cu), silver (Ag), or an alloy material or a compound material mainly composed of these low resistance metals is preferable. .
- the crystal recovery proceeds mainly from the substrate 1 side of the source / drain region 6 with less crystal breakdown.
- the crystal recovery of the source / drain region 6 at the time of activation can be achieved as shown in FIG. Since the process proceeds not only from the substrate 1 side but also from the low-concentration impurity region 7 side, the crystal recovery of the source / drain region 6 can be promoted.
- crystal recovery proceeds from two directions on the substrate 1 side and the low-concentration impurity region 7 side, so that the crystallinity can be greatly improved.
- the sheet resistance of the source / drain region 6 can be reduced, and the contact resistance between the crystalline semiconductor layer 2 and the wiring 10 can be reduced, so that the occurrence of contact failure can be suppressed.
- the sheet resistance and the contact resistance of the source-drain region 6 is reduced, reducing the on-resistance of the semiconductor device, it is possible to suppress the I on failure caused by the on-current decreases.
- the contact portion 11 is disposed so as to overlap the low concentration impurity region 7.
- the source / drain region 6 in which crystal recovery has occurred adjacent to the low-concentration impurity region 7 can be reliably arranged with respect to the contact portion 11, so that contact resistance can be more reliably reduced, contact failure and Ion failure can be more reliably suppressed.
- the low-concentration impurity region 7 only needs to overlap a region of about 10 to 80% of the contact portion 11.
- the low concentration impurity region 7 may be formed by utilizing the film thickness difference of the gate insulating film 3.
- 13A and 13B are schematic views showing the vicinity of a source / drain region of a TFT provided in another semiconductor device of Embodiment 1, FIG. 13A is a plan view, and FIG. 13B is an X1- It is sectional drawing in a Y1 line.
- the gate insulating film 3 is formed by laminating two insulating films, a first gate insulating film 3a and a second gate insulating film 3b, on the low-concentration impurity region 7.
- the source / drain region 6 may have a structure formed only from the second gate insulating film 3b. That is, the gate insulating film 3 may have a structure having a film thickness difference.
- a method of forming the gate insulating film 3, the source / drain region 6 and the low-concentration impurity region 7 having a difference in film thickness will be described.
- a first gate insulating film 3a which is an insulating film having a thickness of 20 to 200 nm (preferably 20 to 80 nm, for example, 50 nm) is formed so as to cover the crystalline semiconductor layer 2.
- the first gate insulation is performed by wet etching using hydrogen fluoride (HF) or the like. An unmasked region of the film 3a is removed, and an opening of the first gate insulating film 3a (a region where the crystalline semiconductor layer 2 is exposed) is formed in a region including the contact portion 11.
- a second gate insulating film 3b having a thickness of 20 to 200 nm (preferably 20 to 80 nm, for example, 30 nm) is formed so as to cover the crystalline semiconductor layer 2 and the first gate insulating film 3a.
- the gate insulating film 3 is formed only from the second gate insulating film 3b in the opening of the first gate insulating film 3a, while a region other than the opening of the first gate insulating film 3a, that is, a low concentration impurity.
- the first gate insulating film 3a and the second gate insulating film 3b are stacked.
- the gate insulating film 3 has a difference in film thickness, when a high dose amount of impurities is ion-implanted into the crystalline semiconductor layer 2 through the gate insulating film 3, the crystallinity of each region in the gate insulating film 3 with different film thicknesses is different. Since the concentration of the impurity ion-implanted into the semiconductor layer 2 is different and the peak of the depth profile 12 of the ion-implanted impurity exists at a different position, the source / drain region 6 and the low-concentration impurity region are formed in the crystalline semiconductor layer 2. 7 can be formed. More specifically, as shown in FIG.
- the low-concentration impurity region is formed by utilizing the film thickness difference provided by stacking the gate insulating films.
- the film thickness difference is provided in the continuous gate insulating film.
- the low concentration impurity region may be formed by utilizing the difference.
- a method of forming a LOCOS (Local Oxidation Of Silicon) oxide film can be used as a method of providing a difference in film thickness in a series of gate insulating films.
- a film quality difference may be provided in the continuous gate insulating film, and the low-concentration impurity region may be formed using the film quality difference.
- a method of providing a difference in film quality in a continuous gate insulating film for example, after a photoresist is selectively formed on a gate insulating film in a region overlapping with a region where a low concentration impurity region is formed, the photoresist is used as a mask. And a method of ion-implanting impurities such as silicon (Si) ions and argon (Ar) ions into the gate insulating film.
- the low-concentration impurity region may be formed using both the film thickness difference and the film quality difference of the gate insulating film.
- the amount of impurities ion-implanted into the crystalline semiconductor layer in the region where the low-concentration impurity is formed can be reduced, so that the crystal breakdown in the low-concentration impurity region is reduced, and the source / drain region is reduced. The effect of promoting crystal recovery can be further enhanced.
- FIG. 3 is a schematic plan view showing the vicinity of a source / drain region of a TFT provided in another semiconductor device of the first embodiment.
- the low-concentration impurity region 7 may be disposed along the outer periphery of the contact portion 11 excluding the channel region side (the gate electrode 4 side in FIG. 3) when the substrate is viewed in plan.
- the low-concentration impurity region 7 may have a shape (for example, a concave shape) having a dent when viewed in plan, and the dent portion may be arranged along the outer periphery of the contact portion 11.
- FIG. 4 is a schematic plan view showing the vicinity of a source / drain region of a TFT provided in another semiconductor device of the first embodiment.
- the low-concentration impurity region 7 is disposed adjacent to the source / drain region 6 except between the contact portion 11 and the channel region (region overlapping the gate electrode 4 in FIG. 4), and when the substrate is viewed in plan view. , And may be disposed along the current path between the contact portion 11 and the channel region, that is, along the source / drain region 6.
- the crystal recovery of the source / drain region 6 around the contact portion 11 can be promoted, and the crystal recovery of the source / drain region 6 around the current path between the contact portion 11 and the channel region can be promoted.
- the low-concentration impurity region 7 may be disposed along a region sandwiched between the contact portions 11 facing each other with the channel region sandwiched when the substrate is viewed in plan.
- the low-concentration impurity region 7 is arranged along a part of the outer periphery of the contact part 11 when the substrate is viewed in plan view. And the low-concentration impurity region 7 may be disposed so as to overlap each other.
- FIG. 5 is a schematic plan view showing the vicinity of a source / drain region of a TFT provided in another semiconductor device of the first embodiment.
- the low-concentration impurity region 7 is arranged along a current path between the contact portion 11 and the channel region (region overlapping the gate electrode 4 in FIG. 5) when the substrate is viewed in plan.
- it may be disposed along the outer periphery of the contact portion 11 excluding the channel region side.
- the contact resistance can be further reduced. From the above, further reduce the on-resistance of the semiconductor device, it is possible to further suppress the I on failure. Further, contact failure can be further suppressed by further reducing the contact resistance.
- the low-concentration impurity region 7 is arranged along the region sandwiched between the contact portions 11 facing each other with the channel region interposed therebetween when the substrate is viewed in plan view, and the contact portion 11 excluding the channel region side. You may arrange
- FIG. 6 is a schematic plan view showing the vicinity of a source / drain region of a TFT provided in another semiconductor device of the first embodiment.
- the low concentration impurity region 7 may be disposed so as to overlap with the outer periphery of the contact portion 11 except for the channel region side (the gate electrode 4 side in FIG. 6) when the substrate is viewed in plan.
- the source / drain region 6 whose crystal has been recovered can be more reliably arranged in the contact portion 11. Therefore, even when a manufacturing apparatus with low alignment accuracy is used, it is possible to more reliably reduce contact resistance and more reliably suppress contact failure and Ion failure.
- the entire outer periphery of the contact portion 11 except for the channel region side is arranged so as to overlap the low concentration impurity region 7. The portion may overlap with the low-concentration impurity region 7.
- FIG. 7 is a schematic plan view showing the vicinity of a source / drain region of a TFT provided in another semiconductor device of the first embodiment.
- the semiconductor device of the present invention is arranged so that a part of the contact portion 11 overlaps with the low-concentration impurity region 7, and when the substrate is viewed in plan view, the LDD region 22 has a source / drain. It may be formed between the region 6 and the channel region (region overlapping the gate electrode 4 in FIG. 7).
- the source / drain region 6 adjacent to the low-concentration impurity region 7 can be reliably disposed in the contact portion 11, so that the contact resistance can be more reliably reduced and the contact failure can be reduced. And I on defects can be more reliably suppressed.
- FIG. 12 is a schematic plan view showing the vicinity of a source / drain region of a TFT provided in another semiconductor device of the first embodiment.
- the LDD region 22 is formed between the source / drain region 6 and the channel region (the region overlapping the gate electrode 4 in FIG. 12).
- the low-concentration impurity region 7 may be disposed along the current path between the contact portion 11 and the channel region, that is, along the source / drain region 6.
- the LDD region 22 is formed between the source / drain region 6 and the channel region, and the low-concentration impurity region 7 sandwiches the channel region. May be arranged along a region sandwiched between the contact portions 11 facing each other.
- region it is not limited to the form shown to FIG. 7 and 12,
- the form shown to FIG. 3, 5 and 6 may be provided with the LDD area
- the impurity concentration of the low concentration impurity region may be the same as or different from the impurity concentration of the LDD region.
- the on-resistance of the semiconductor device can be reduced, and the I on failure due to the decrease in the on-current can be suppressed.
- Various forms described in the embodiments may be combined as appropriate.
- FIG. 14 is a schematic plan view of a TFT provided in the semiconductor device of Example 1.
- FIG. 14 a manufacturing method of the TFT provided in the semiconductor device of Example 1 will be described.
- an amorphous silicon film was formed by a LPCVD method on a glass substrate as a substrate.
- the amorphous silicon film on the glass substrate was crystallized with a laser and patterned to form a polysilicon film having a thickness of 50 nm, which is a crystalline semiconductor layer.
- a 30 nm-thickness SiO 2 film as a gate insulating film was formed by plasma CVD.
- a photoresist functioning as a mask at the time of ion implantation was formed.
- a region where the source / drain region 6 of the crystalline semiconductor layer is formed is included in the opening (implanted region) 13 of the photoresist, and a region where the low concentration impurity region 7 is formed is masked. Patterned.
- high dose impurities were ion-implanted into the polysilicon film through the SiO 2 film using the photoresist as a mask.
- the conditions for ion-implanting a high dose impurity are phosphorus (P) as an impurity, standard conditions (acceleration voltage is 20 keV, impurity ion dose is 8 ⁇ 10 14 cm ⁇ 2 ), and source / drain regions.
- the low concentration impurity region 7 was formed in the region of the polysilicon film masked with the photoresist.
- the source / drain region 6 was formed by heating at 550 ° C. for 240 minutes to activate the impurities implanted into the polysilicon film and recover the crystal of the polysilicon film.
- the low-concentration impurity region 7 has a structure in which the low-concentration impurity region 7 overlaps a part of the contact portion 11 and the contact portion 11 and the channel region (a region overlapping the gate electrode 4 in FIG. 14) when the substrate is viewed in plan view. Along the current path between them, that is, along the source / drain region 6.
- the TFT 100a was fabricated through the above steps.
- FIG. 15 is a graph showing the Vg-Id characteristics of the TFT provided in the semiconductor device of Example 1, (a) is the case of the standard condition, (b) is the case of the over-injection condition 1, c) is the case of over-injection condition 2.
- E on the vertical axis scale indicating the value of the drain current is meant to be a power of 10, for example, 1E-03 corresponds to 1 ⁇ 10 -3.
- the Vg-Id characteristics of the TFT 100a are obtained in the saturation region and the linear region even when the impurity is excessively ion-implanted and the impurity concentration of the source / drain region 6 is increased.
- the on-current did not drop significantly, and the behavior showed little variation. From this, it was found that in the TFT 100a having the low concentration impurity region 7, the crystal recovery of the source / drain region 6 is sufficiently performed.
- FIG. 16 is a schematic plan view of a TFT provided in the semiconductor device of Comparative Example 1.
- a manufacturing method of the TFT provided in the semiconductor device of Comparative Example 1 will be described.
- the TFT 100b provided in the semiconductor device of Comparative Example 1 high dose ion implantation is performed so that the entire crystalline semiconductor layer is included in the implantation region 13 without forming a photoresist, and is masked by the gate electrode 4.
- the crystalline semiconductor layer (including the region to be the contact portion 11) other than the region was used as the source / drain region 6. That is, the TFT 100b is configured not to have a low concentration impurity region.
- the TFT 100b was manufactured using the same manufacturing method as the TFT 100a in Example 1.
- FIG. 17 is a graph showing the Vg-Id characteristics of the TFT provided in the semiconductor device of Comparative Example 1.
- (a) is the case of the standard condition
- (b) is the case of the over-injection condition 1
- c) is the case of over-injection condition 2.
- E on the vertical scale indicating the drain current value means a power of 10.
- 1E-03 corresponds to 1 ⁇ 10 ⁇ 3 .
- the Vg-Id characteristic of the TFT 100b shows a behavior with a larger variation than that of the TFT 100a under the standard conditions, and becomes saturated as the ion implantation conditions become excessive.
- the variation in behavior in the region and the linear region increased, and the on-current peaked out at a lower Vg.
- Example 1 can demonstrate that the effect of promoting the crystal recovery of the source / drain region 6 by the low-concentration impurity region 7 is effective in improving the characteristics of the TFT provided in the semiconductor device. It was. Further, as in the first embodiment, the low-concentration impurity region 7 overlaps with a part of the contact portion 11 and along the current path between the contact portion 11 and the channel region, that is, along the source / drain region 6. By arranging the low concentration impurity region 7, the characteristics of the TFT provided in the semiconductor device can be improved more effectively.
- FIG. 2 is a schematic cross-sectional view showing the vicinity of a source / drain region of a TFT provided in the semiconductor device of Embodiment 1, where (a) shows a state at the time of ion implantation of a high dose amount of impurity, and (b) shows an activated state. It is a state.
- 2 is a schematic plan view showing the vicinity of a source / drain region of a TFT provided in the semiconductor device of Embodiment 1.
- FIG. 6 is a schematic plan view showing the vicinity of a source / drain region of a TFT provided in another semiconductor device of Embodiment 1.
- FIG. 6 is a schematic plan view showing the vicinity of a source / drain region of a TFT provided in another semiconductor device of Embodiment 1.
- FIG. 1 is a schematic cross-sectional view showing the vicinity of a source / drain region of a TFT provided in the semiconductor device of Embodiment 1, where (a) shows a state at the time of ion implantation of
- FIG. 6 is a schematic plan view showing the vicinity of a source / drain region of a TFT provided in another semiconductor device of Embodiment 1.
- FIG. 6 is a schematic plan view showing the vicinity of a source / drain region of a TFT provided in another semiconductor device of Embodiment 1.
- FIG. 6 is a schematic plan view showing the vicinity of a source / drain region of a TFT provided in another semiconductor device of Embodiment 1.
- FIG. It is a cross-sectional schematic diagram which shows the source-drain region vicinity of TFT with which the conventional semiconductor device was equipped, (a) is the state at the time of ion implantation of the impurity of high dose amount, (b) is the state at the time of activation It is.
- (A) is a state of optical microscope observation of polysilicon before activation, and (b) is a graph showing a Raman spectrum of polysilicon before activation.
- (A) is a state of optical microscope observation of polysilicon after activation, and (b) is a graph showing a Raman spectrum of polysilicon after activation.
- (A) is a state of optical microscope observation of amorphous silicon, and (b) is a graph showing a Raman spectrum of amorphous silicon.
- 6 is a schematic plan view showing the vicinity of a source / drain region of a TFT provided in another semiconductor device of Embodiment 1.
- FIG. 4 is a schematic diagram showing the vicinity of a source / drain region of a TFT provided in another semiconductor device of Embodiment 1, (a) is a plan view, and (b) is a cross section taken along line X1-Y1 in (a).
- FIG. 3 is a schematic plan view of a TFT provided in the semiconductor device of Example 1.
- FIG. 4 is a graph showing Vg-Id characteristics of TFTs provided in the semiconductor device of Example 1, wherein (a) is the case of standard conditions, (b) is the case of over-injection conditions 1, and (c) is This is a case of over-injection condition 2.
- 6 is a schematic plan view of a TFT provided in the semiconductor device of Comparative Example 1.
- FIG. 1 is a schematic diagram showing the vicinity of a source / drain region of a TFT provided in another semiconductor device of Embodiment 1, (a) is a plan view, and (b) is a cross section taken along line X1-Y1 in (a).
- FIG. 7 is a graph showing Vg-Id characteristics of a TFT provided in the semiconductor device of Comparative Example 1, wherein (a) is a case of standard conditions, (b) is a case of over-injection conditions 1, and (c) is This is a case of over-injection condition 2.
- FIG. 6 is a schematic cross-sectional view showing the vicinity of a source / drain region of a TFT provided in the semiconductor device of Embodiment 1 in which a high dose impurity is ion-implanted under another condition.
- Substrate 2 Crystalline semiconductor layer 3: Gate insulating film 3a: First gate insulating film 3b: Second gate insulating film 4: Gate electrode 5: Channel region 6: Source / drain region 7, 17: Low concentration impurity region (Ion non-implanted region) 8: Photoresist (resist) 9: Impurity 10: Wiring 11: Contact portion 12: Depth profile 13: Photoresist opening (implanted region) 20: Polysilicon 21: Ion implantation region 22: LDD region 23: Amorphous silicon 100a, 100b: TFT
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Abstract
Description
本発明の半導体装置における好ましい形態について以下に詳しく説明する。なお、以下に示す形態は、適宜組み合わせて用いてもよい。
実施形態1の半導体装置の構成を図を参照して説明する。図1は実施形態1の半導体装置に備えられたTFTのソース・ドレイン領域近傍を示す断面模式図であり、(a)は高ドーズ量の不純物のイオン注入時の状態であり、(b)は活性化時の状態である。図1(a)及び(b)中のソース・ドレイン領域6における色の濃淡は結晶性の違いを示しており、色が濃い領域ほど結晶破壊が進行し、結晶性が低い。なお、図8に示した従来の半導体装置と同様に、図1に示す実施形態1の半導体装置においても、イオン注入された不純物の深さプロファイルのピークがゲート絶縁膜に存在するように条件を設定して高ドーズ量の不純物のイオン注入を行う場合を示している。また、図2は実施形態1の半導体装置に備えられたTFTのソース・ドレイン領域近傍を示す平面模式図である。図1(a)に示すように、本実施形態の半導体装置は、基板1上に、チャネル領域5、ソース・ドレイン領域6及び低濃度不純物領域7を有する結晶性半導体層2と、ゲート絶縁膜3と、ゲート電極4とが基板1側からこの順に積層された構成のTFTを備える。また、本発明の半導体装置は、図1(b)に示されるように、コンタクトホールを介してソース・ドレイン領域6に接続された配線10(図1(b)中の点線で囲まれた領域)を備える。チャネル領域5、ソース・ドレイン領域6及び低濃度不純物領域7は、同じ半導体層から形成され、同じ平面内で隣接配置される。
図14は実施例1の半導体装置に備えられたTFTの平面模式図である。以下、実施例1の半導体装置に備えられたTFTの製造方法について説明する。
まず、基板であるガラス基板上にアモルファスシリコン膜をLPCVD法によって成膜した。次に、ガラス基板上のアモルファスシリコン膜をレーザーで結晶化し、パターニングすることで、結晶性半導体層である膜厚50nmのポリシリコン膜を形成した。次に、プラズマCVD法を用いてゲート絶縁膜である膜厚30nmのSiO2膜を形成した。次に、ゲート電極4を形成した後、イオン注入時のマスクとして機能するフォトレジストを形成した。フォトレジストは、結晶性半導体層のソース・ドレイン領域6が形成される領域がフォトレジストの開口部(注入領域)13に含まれるとともに、低濃度不純物領域7が形成される領域がマスクされるようにパターニングした。次に、フォトレジストをマスクとしてSiO2膜越しにポリシリコン膜に対して高ドーズ量の不純物をイオン注入した。高ドーズ量の不純物をイオン注入する条件は、不純物としてリン(P)を使用し、標準条件(加速電圧が20keV、不純物イオンのドーズ量が8×1014cm-2)と、ソース・ドレイン領域6の不純物濃度が標準条件の約4倍である過剰注入条件1(標準条件でイオン注入した後、加速電圧が30keV、不純物イオンのドーズ量が1.6×1015cm-2の条件で追加でイオン注入)と、ソース・ドレイン領域6の不純物濃度が標準条件の約6倍である過剰注入条件2(標準条件でイオン注入した後、加速電圧が45keV、不純物イオンのドーズ量が1.6×1015cm-2の条件で追加でイオン注入)との三種類の条件で行った。これにより、ポリシリコン膜のフォトレジストでマスクされた領域に低濃度不純物領域7を形成した。次に、550℃で240分間加熱し、ポリシリコン膜に注入された不純物の活性化とポリシリコン膜の結晶回復とを行うことで、ソース・ドレイン領域6を形成した。低濃度不純物領域7は、低濃度不純物領域7がコンタクト部11の一部と重なり、かつ基板を平面視したときに、コンタクト部11とチャネル領域(図14におけるゲート電極4に重なる領域)との間の電流経路に沿って、すなわち、ソース・ドレイン領域6に沿って配置した。以上の工程により、TFT100aを作製した。
図16は比較例1の半導体装置に備えられたTFTの平面模式図である。以下、比較例1の半導体装置に備えられたTFTの製造方法について説明する。
比較例1の半導体装置に備えられたTFT100bにおいては、フォトレジストを形成せず、結晶性半導体層全体が注入領域13に含まれるように高ドーズ量のイオン注入を行い、ゲート電極4によってマスクされた領域以外の結晶性半導体層(コンタクト部11となる領域を含む)をソース・ドレイン領域6とした。すなわち、TFT100bは、低濃度不純物領域を有しない構成とした。それ以外の工程については実施例1におけるTFT100aと同一の製造方法を用いて、TFT100bを作製した。
2:結晶性半導体層
3:ゲート絶縁膜
3a:第一ゲート絶縁膜
3b:第二ゲート絶縁膜
4:ゲート電極
5:チャネル領域
6:ソース・ドレイン領域
7、17:低濃度不純物領域(イオン非注入領域)
8:フォトレジスト(レジスト)
9:不純物
10:配線
11:コンタクト部
12:深さプロファイル
13:フォトレジスト開口部(注入領域)
20:ポリシリコン
21:イオン注入領域
22:LDD領域
23:アモルファスシリコン
100a、100b:TFT
Claims (13)
- 基板上に、チャネル領域及びソース・ドレイン領域を含む結晶性半導体層を有する薄膜トランジスタと、該ソース・ドレイン領域に接続される配線とを備える半導体装置であって、
該結晶性半導体層は、該ソース・ドレイン領域よりも不純物濃度が低い低濃度不純物領域と、該配線に接触するコンタクト部とを有し、
該低濃度不純物領域は、該チャネル領域側を除く領域の該ソース・ドレイン領域と隣接して配置されることを特徴とする半導体装置。 - 前記低濃度不純物領域は、前記ソース・ドレイン領域と同一面に配置されることを特徴とする請求項1記載の半導体装置。
- 前記コンタクト部の一部は、前記低濃度不純物領域と重なることを特徴とする請求項2記載の半導体装置。
- 前記低濃度不純物領域は、前記基板を平面視したときに、前記チャネル領域側を除く前記コンタクト部の外周に沿って配置されることを特徴とする請求項2又は3記載の半導体装置。
- 前記低濃度不純物領域は、前記基板を平面視したときに、前記コンタクト部と前記チャネル領域との間の電流経路に沿って配置されることを特徴とする請求項2~4のいずれかに記載の半導体装置。
- 前記低濃度不純物領域は、前記基板を平面視したときに、前記コンタクト部と前記チャネル領域との間の電流経路に沿って配置されるとともに、前記チャネル領域側を除く前記コンタクト部の外周に沿って配置されることを特徴とする請求項2~5のいずれかに記載の半導体装置。
- 前記薄膜トランジスタは、ゲート絶縁膜を含み、
前記半導体装置は、前記低濃度不純物領域と重なる領域の該ゲート絶縁膜上にレジストを有することを特徴とする請求項2~6のいずれかに記載の半導体装置。 - 前記薄膜トランジスタは、ゲート絶縁膜を含み、
該ゲート絶縁膜は、前記低濃度不純物領域に重なる領域が前記ソース・ドレイン領域に重なる領域と一続きであるとともに、前記低濃度不純物領域に重なる領域とソース・ドレイン領域に重なる領域とにおける膜厚及び膜質の少なくとも一方が異なることを特徴とする請求項2~6のいずれかに記載の半導体装置。 - 前記薄膜トランジスタは、ゲート絶縁膜を含み、
前記低濃度不純物領域と重なる領域の該ゲート絶縁膜は、積層された複数の絶縁膜を含むことを特徴とする請求項2~6のいずれかに記載の半導体装置。 - 請求項2~7のいずれかに記載の半導体装置の製造方法であって、
該製造方法は、前記結晶性半導体層の前記低濃度不純物領域が形成される領域と重なる領域のゲート絶縁膜上にレジストをパターニングする工程と、
該レジストをマスクとして該ゲート絶縁膜越しに前記結晶性半導体層に不純物を添加する工程とを含むことを特徴とする半導体装置の製造方法。 - 請求項2~6及び9のいずれかに記載の半導体装置の製造方法であって、
該製造方法は、前記結晶性半導体層の前記低濃度不純物領域が形成される領域上に第一ゲート絶縁膜をパターニングする工程と、
前記結晶性半導体層及び該第一ゲート絶縁膜を覆って第二ゲート絶縁膜を形成する工程と、
該第一ゲート絶縁膜及び該第二ゲート絶縁膜越しに前記結晶性半導体層に不純物を添加する工程とを含むことを特徴とする半導体装置の製造方法。 - 請求項1~9のいずれかに記載の半導体装置を備えることを特徴とする表示装置。
- 請求項10又は11記載の半導体装置の製造方法によって製造された半導体装置を備えることを特徴とする表示装置。
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JP2004056025A (ja) * | 2002-07-24 | 2004-02-19 | Casio Comput Co Ltd | 薄膜トランジスタ装置およびその製造方法 |
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