EP0886884A1 - Agencement de cellules memoire avec transistors mos verticaux et procede de production correspondant - Google Patents

Agencement de cellules memoire avec transistors mos verticaux et procede de production correspondant

Info

Publication number
EP0886884A1
EP0886884A1 EP97915321A EP97915321A EP0886884A1 EP 0886884 A1 EP0886884 A1 EP 0886884A1 EP 97915321 A EP97915321 A EP 97915321A EP 97915321 A EP97915321 A EP 97915321A EP 0886884 A1 EP0886884 A1 EP 0886884A1
Authority
EP
European Patent Office
Prior art keywords
trenches
doped
main surface
flanks
strip
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
EP97915321A
Other languages
German (de)
English (en)
Inventor
Franz Hofmann
Josef Willer
Wolfgang Krautschneider
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Infineon Technologies AG
Original Assignee
Siemens AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Siemens AG filed Critical Siemens AG
Publication of EP0886884A1 publication Critical patent/EP0886884A1/fr
Ceased legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10B—ELECTRONIC MEMORY DEVICES
    • H10B20/00—Read-only memory [ROM] devices
    • H10B20/27—ROM only
    • H10B20/40—ROM only having the source region and drain region on different levels, e.g. vertical channel
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10B—ELECTRONIC MEMORY DEVICES
    • H10B20/00—Read-only memory [ROM] devices

Definitions

  • MOS transistors Semiconductor-based read-only memories are known for storing smaller amounts of data. In many cases, these are implemented as a plane integrated silicon circuit in which MOS transistors are used as memory cells. The transistors are selected via the gate electrode, which is connected to the word line. The input of the MOS transistor is connected to a reference line, the output to a bit line. The reading process evaluates whether a current flows through the transistor or not. The logical values zero and one are assigned accordingly.
  • the storage of zero and one is effected in that no MOS transistor is produced in memory cells in which the logic value associated with the state "no current flow through the transistor" is stored or no conductive connection to the bit line is realized MOS transistors can be realized for the two logical values, which have different threshold voltages due to different dopant concentrations in the channel region.
  • semiconductor-based memories allow random access to the stored information.
  • the one for reading the The electrical power required for information is significantly smaller than in the aforementioned storage systems with mechanically moving parts. As no moving parts are required, mechanical wear and sensitivity to vibrations are also eliminated.
  • Semiconductor-based memories can therefore also be used for mobile systems.
  • the silicon memories described usually have a planar structure. This means that a minimum space requirement is required per memory cell, which in the best case is 4 F ⁇ , where F is the smallest structure size that can be produced in the respective technology.
  • a read-only memory cell arrangement is known, the memory cells of which comprise MOS transistors. These MOS transistors are arranged along trenches such that a source region adjoins the bottom of the trench, a drain region adjoins the surface of the substrate and a channel region both vertically to the surface of the substrate and parallel to the surface of the substrate on the flank and Bottom of the trench adjoins.
  • the surface of the channel area is provided with a gate dielectric.
  • the gate electrode is designed as a flank covering (spacer). The logical values zero and one are distinguished by different threshold voltages which are brought about by channel implantation.
  • the implanting ions hit the surface of the respective trench at such an angle that is specifically implanted along one flank by shadowing effects of the opposite flank.
  • the word lines run as spacers along the flanks of the trenches.
  • JP-OS 4-226071 which comprises vertical MOS transistors arranged as memory cells on the flanks of trenches. Diffusion runs on the bottom of trenches and between adjacent trenches. ons regions, which each form the source / drain regions of the vertical MOS transistors.
  • the word lines, which comprise the gate electrodes of the vertical MOS transistors, run perpendicular to the trenches.
  • the threshold voltage of the vertical MOS transistors is set by an angled implant.
  • a memory cell arrangement is known from US Pat. No. 4,663,644 which comprises vertical MOS transistors as memory cells. These vertical MOS transistors are each arranged on the flanks of trenches.
  • the word lines which each comprise the gate electrodes of the vertical MOS transistors, are arranged in the trenches. Two word lines are arranged in each trench.
  • the bit lines are implemented as conductor tracks on the surface of the substrate.
  • the contact between the bit lines and the respective source / drain regions, which adjoin the surface of the substrate, is realized via a contact hole.
  • the source / drain regions, which adjoin the bottom of the trenches, are implemented as a continuous doped layer and are set to reference potential.
  • the information is stored in this memory cell arrangement in the form of threshold voltages of different levels for the MOS transistors.
  • the different threshold voltages are realized by different dopant concentrations in the channel region of the MOS transistors.
  • a doped layer is deposited and structured in such a way that flanks in which increased dopant concentrations are to be formed remain covered by the structured dopant layer.
  • the channel regions with an increased dopant concentration are formed by diffusion out of the structured dopant layer.
  • the invention is based on the problem of specifying a memory cell arrangement based on semiconductors in which an increased memory density is achieved and which can be produced with a few production steps and with a high yield. Of- Furthermore, a method for producing such a memory cell arrangement is to be specified.
  • memory cells are provided in a substrate, each of which comprises a MOS transistor vertical to the main surface.
  • a substrate made of monocrystalline silicon or the silicon layer of an SOI substrate is preferably used as the substrate.
  • the vertical MOS transistors have different threshold voltages depending on the stored information.
  • the MOS transistors are driven at a voltage level at which the MOS transistors conduct with a lower threshold voltage and those with a higher threshold voltage do not conduct.
  • Strip-shaped trenches running essentially parallel are provided in the substrate. Strip-shaped doped regions are arranged on the bottom of the trenches and on the main area between adjacent trenches, which are doped with a second conductivity type opposite to the first. Gate dielectrics are arranged on the flanks of the trenches. Word lines are provided which run transversely to the trenches and which comprise gate electrodes for the vertical MOS transistors in the region of the flanks of the trenches.
  • the vertical MOS transistors each consist of two strip-shaped doped regions adjacent to the same flank of one of the trenches, which act as a source / drain region, the flank of the trench arranged therebetween, the gate dielectric and the part arranged above one of the words - lines formed.
  • the striped doped areas are used as bit or reference line in the operation of the memory cell arrangement.
  • memory cells in which predetermined information is stored have a dopant region in the upper region of the flank of the trench, the extent of the dopant perpendicular to the main surface being less than the depth of the trenches.
  • the doping regions are preferably doped with the same conductivity type as the channel regions, but with an increased doping concentration. In this case, the threshold voltage increases. They can also be doped from the opposite conductivity type, in which case the threshold voltage drops.
  • the invention makes use of the knowledge that the threshold voltage of a MOS transistor can also be set by a locally inhomogeneous dopant concentration in the channel region.
  • the parts of the dopant region and its precise adjustment with respect to the associated word line are therefore not critical.
  • the vertical MOS transistors have more than two different threshold voltages.
  • the dopant regions are realized with different dopant concentrations in the flanks.
  • the distance between adjacent trenches is preferably selected such that it is substantially equal to the width of the trenches.
  • the distance between adjacent word lines is also chosen equal to the width of the word lines. If the width of the trenches and the width of the word lines correspond to the minimum structure width F in the respective
  • stripe-shaped trenches are preferably formed in a main surface of a substrate, said trenches running essentially parallel.
  • Strip-shaped doped regions are formed on the bottom of the trenches and on the main surface between adjacent trenches, which are doped from a second conductivity type opposite to the first.
  • a mask layer is applied, which has an essentially conformal edge covering.
  • a mask for example made of photoresist, is produced on the mask layer and has openings.
  • the mask layer is structured using the mask so that in the area of the openings
  • the main surface and the surface of the trenches are exposed.
  • the flanks of trenches in the area of the openings are only partially exposed, so that a residue of the mask layer remains on these flanks in the lower area of the trenches.
  • the trenches are preferably formed by anisotropic etching using a trench mask.
  • the stripe-shaped doped regions on the bottom of the trenches and on the main area between adjacent trenches are preferably produced by an implantation after the trench formation and after removal of the trench mask. It is advantageous to include the flanks of the trenches before the implantation
  • the stripe-shaped doped regions can be produced by creating a doped region on the main surface before the trenches are formed, which covers the entire memory cell array. When the trenches are opened, this doped region is divided into the strip-like doped regions on the main surface.
  • the strip-shaped doped regions at the bottom of the trenches are produced by ion implantation after the trenches have opened. When using a trench mask, it is advantageous to leave it as a mask on the main surface during the implantation.
  • the mask layer is preferably structured by anistropic etching.
  • the mask layer can also be structured by combined isotropic and anisotropic etching. The etching is selective to the substrate.
  • the main surface and the bottoms of the trenches are exposed in the region of the openings.
  • the etching attack on the exposed main area and the exposed bottoms of the trenches which is inevitable because of the finite selectivity of the etching, is reduced.
  • the threshold voltage only depends on the dopant concentration in the channel area, both the exact depth of the dopant area and its lateral adjustment with respect to the arrangement of the gate electrodes are not critical.
  • the dopant regions are preferably formed in the exposed flank parts by an angled implantation.
  • the implantation is preferably carried out with an inclination angle in the range between 20 ° and 30 ° against the normal of the Main area. Such inclination angles are provided as standard in many implantation systems to avoid the channeling effect.
  • the dopant regions are produced by diffusion out of a doped layer.
  • the doped layer is applied over the entire surface above the structured mask layer.
  • the doped layer is preferably formed from doped glass, doped polysilicon or doped amorphous silicon.
  • doped glass has the advantage that in this case the doped layer can be selectively removed from the substrate.
  • the mask used for structuring can be removed in order to avoid shadowing by the mask during the subsequent implantation.
  • the method according to the invention can thus also be used for trench widths which can be significantly smaller than in the storage cell arrangement known from DE 42 14 923 A1.
  • the mask for structuring the mask layer is formed from photoresist, the photoresist does not have to be exposed to the bottom of the trench during the exposure for programming.
  • Modern exposure steppers with a focus depth of ⁇ 0.5 ⁇ m can thus also be used in the method according to the invention. Because the mask layer at the bottom of the trench is not necessarily removed unexposed photoresist can remain on the bottom of the trench in the method according to the invention. This avoids exposure problems over the full topology of the trench.
  • FIG. 1 shows a substrate with a trough doped with a first conductivity type.
  • FIG. 2 shows the substrate after the etching of stripe-shaped trenches.
  • FIG. 3 shows the substrate after the formation of stripe-shaped doped regions on the bottoms of the trenches and between adjacent trenches on the main surface.
  • FIG. 4 shows the substrate after the application of a mask layer and the formation of a mask.
  • FIG. 5 shows the substrate after structuring the mask layer.
  • FIG. 6 shows the substrate after the application of a doped layer.
  • FIG. 7 shows the substrate after the formation of dopant regions in the flanks of the trenches and after the formation of word lines running transversely to the trenches.
  • FIG. 8 shows a plan view of the substrate after the word lines have been formed.
  • a substrate 1 of, for example, p-doped silicon with a dopant concentration monokri ⁇ stallinem of 5 x l ⁇ l5 cm "3 is in a major surface 2 by implantation and subsequent heat-doped p-a trough 3 with a dopant concentration of 2 x 10- * - 7 cm ⁇ ⁇ generated (see Figure 1.)
  • a scattering oxide with a thickness of, for example, 50 nm (not shown) is used, which after driving in the p-doped well 3 with 180 keV, 7 x 10 ⁇ 2 cm ⁇ 2.
  • the p-doped well 3 extends at least over an area for one cell field.
  • An SiO 2 "layer is deposited on the main surface 2 in a layer thickness of, for example, 300 nm, for example in a TEOS process.
  • the SiO 2 layer is structured with the aid of photolithographic process steps, a trench mask 4 being formed.
  • the trench mask 4 has stripes
  • the strip-shaped openings in the trench mask 4 have a width of, for example, 0.4 ⁇ m, a length of, for example, 125 ⁇ m and a distance of 0.4 ⁇ m.
  • trenches 5 are etched into the main surface 2 of the substrate 1 in an anisotropic etching process, for example using HBr, He, O2, NF3.
  • Trenches 5 have a strip-shaped cross section corresponding to the openings of the trench mask 4 parallel to the main surface 2. They have a width of for example 0.4 ⁇ m, a length of for example 125 ⁇ m and a distance of for example 0.4 ⁇ m. The depth of the trenches is, for example, 0.6 ⁇ m (see FIG. 2). For example, 32 parallel trenches 5 are formed. The trench mask 4 is then removed using, for example, HF dip. In order to improve the quality of the crystal surfaces, an SiO 2 layer 6 (so-called sacrificial oxide) with a thickness of, for example, 20 nm is produced by thermal oxidation (see FIG. 3).
  • SiO 2 layer 6 silicacrificial oxide
  • SiO 2 spacers 7 and the SiO 2 layer 6 are then removed, for example by wet chemical etching with HF dip.
  • a mask layer 9 with an essentially conformal edge covering is deposited from SiO 2, for example in a TEOS process.
  • the mask layer 9 is deposited in a layer thickness of 60 to 80 nm (see FIG. 4).
  • a mask 10 is then formed, for example, from photoresist using photolithographic process steps.
  • the mask 10 has openings 11 in the cell field.
  • the openings 11 are adjusted so that they overlap at least one flank of the trenches 5.
  • the dimensions of the openings 11 parallel to the main surface 2 each correspond to the width of the trenches 5. Larger dimensions of the openings 11 result from the collapse of adjacent openings.
  • the mask 10 is adjusted so that the openings 11 are arranged to overlap the flanks of the trenches 5.
  • the openings 11 likewise have minimal dimensions of F x F.
  • the adjustment accuracy is, for example, F / 2 to F / 3 .
  • the mask layer 9 is structured in an anisotropic etching process, for example using HBr, CI2, He.
  • the mask 10 acts as an etching mask. In this case, 5 etching residues 9 'remain in the region of the openings 11 on the flanks of the trenches. In the area of the openings 11, the silicon surface is exposed on the bottoms of the trenches 5 and on the main surface 2 between adjacent trenches 5. Under the mask 10, however, the mask layer 9 is not attacked.
  • the patterning of the mask layer 9 takes place in an etching process which is selective for silicon. However, due to the limited selectivity, there is an etching attack on the exposed silicon surfaces. Since the etching residues 9 ′ remain on the flanks of the trenches 5, the etching attack on the exposed silicon surfaces that is unavoidable due to the finite selectivity is reduced.
  • the height of the etching residues 9 ′ is less than the depth of the strip-shaped, doped regions 8 arranged on the main surface 2.
  • the height of the etching residues 9 ' is, for example, 300 nm.
  • the exact height of the etching residues 9' is not critical as long as part of the trench wall is exposed below the strip-shaped doped region 8 adjacent to the trench wall.
  • Parts of the mask layer 9 exposed at the bottom of the trenches 5 by the mask 10 are removed during the structuring of the mask layer 9. In the event that when the mask 10 is formed from photoresist, the photoresist has not been exposed to the bottom of the trenches 5, the mask layer 9 at the bottom of the trenches 5 is covered by unexposed photoresist.
  • the mask layer 9 is not attacked during the anisotropic etching at the bottom of the trenches 5 and the bottom of the trenches 5 remains covered by the mask layer 9. This is not critical for the further course of the method according to the invention.
  • the mask 10 is removed (see FIG. 5).
  • a thin scattering oxide (approx. 10 nm) is then deposited using a TEOS process (not shown).
  • two angled implantations with boron are carried out with a dose of 10 ⁇ 3 c ⁇ 2 to 5 x 10 ⁇ - cm ⁇ 2 and an energy of 60 keV.
  • the angle of inclination relative to the normal of the main surface 2 is 20 ° to 30 °, and - 20 ° to - 30 °.
  • dopant regions 12 are formed in the exposed flanks of the trenches 5 above the etching residues 9 '(see FIG. 7).
  • the Dotierstoff capableen 12 is a dopant concentration of some 10 17 cm -3, 8 x 10 ⁇ preferred wise adjusted to 7 cm ⁇ 3 f.
  • the doping in the stripe-shaped doped regions is 8 10 ⁇ 1 cm "3, the implantation of boron in this area can be tolerated.
  • the mask 10 is formed, 5 unexposed photoresist remains at the bottom of the trenches and the Bottoms of the trenches 5 are covered with the mask layer 9, boron is not implanted into the strip-shaped doped regions 8 arranged at the bottom of the trenches 5.
  • the formation of the dopant regions 12 in the exposed flanks of the trenches 5 is not impaired by this.
  • the dopant regions 12 are formed in the flanks of the trenches 5 by diffusion out of a doped layer 13.
  • the doped layer 13 for example made of borosilicate glass, is deposited over the entire surface in a layer thickness of 50 nm (see FIG. 6).
  • the doping areas 12 are produced by out-diffusion.
  • the doped layer 13 is removed, for example with an HF dip.
  • a gate dielectric 14 is produced, for example by thermal oxidation, in a layer thickness of 10 nm, for example.
  • the vertical MOS transistors are each formed from two strip-shaped doped regions 8 which adjoin the same flank of one of the trenches 5, the part of the trough 3 arranged in between as a channel region, the gate dielectric 14 and the part of one of the word lines 15 adjoining it.
  • the extent of the vertical MOS transistor parallel to the course of the strip-shaped trenches 5 is given by the width of the word lines 15.
  • MOS transistors that are adjacent along an edge of one of the trenches are separated by the distance between adjacent word lines 15 separated from each other.
  • the strip-shaped doped regions 8 each run over the entire cell field. They form lines which, depending on the circuitry, are used as bit lines or reference lines and which connect the source / drain regions of MOS transistors adjacent along a trench.
  • the vertical MOS transistor has an increased threshold voltage or not.
  • the information stored in the memory cell arrangement is stored in the presence or absence of the dopant regions 12.
  • the programming of the memory cell arrangement is therefore carried out when the mask layer 9 is structured.
  • the arrangement of the openings 11 in the mask 10 transfers the information into the memory cell arrangement.
  • the strip-shaped doped regions 8 are used as bit or reference lines for reading out the memory cells.
  • the memory cell to be evaluated is selected via the word line.
  • a control signal is applied to the word line, the voltage level of which lies between the threshold voltage of the MOS transistors with dopant region 12 in the channel region and that of the MOS transistors without dopant region 12 in the channel region. With this control signal, the MOS transistors without dopant region 12 in the channel region become conductive, while the MOS transistors with dopant region 12 in the channel region, which have an increased threshold voltage, continue to block.
  • it is evaluated whether a current flows between the associated strip-shaped doped regions 8 or not.
  • FIG. 8 shows a top view of the memory cell arrangement. The course of the word lines 15 across the trenches 5 is shown. Furthermore, the stripe-shaped, doped areas 8 entered, which run at the bottom of the trenches 5 and between adjacent trenches 5. Doping regions 12 are entered in the flanks of the trenches as a dashed contour.
  • Each memory cell comprises a vertical MOS transistor, which has an extent of 2 F parallel to the course of the stripe-shaped trenches 5 and an extent of F perpendicular to the course of the stripe-shaped trenches 5.
  • the space requirement per memory cell is therefore 2 F 2 .
  • the production of the memory cell arrangement is concluded with the deposition of an intermediate dielectric, the opening of contact holes and the production of a metallization (not shown).

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Abstract

Dans un agencement de cellules mémoire comprenant des transistors MOS verticaux servant de cellules mémoire, l'information est mémorisée au moyen de différentes tensions seuil des transistors. A cet effet, des zones d'agent dopant sont formées, pour un état d'information, par implantation angulaire ou diffusion dans la partie supérieure de la zone de canal. La partie inférieure de la zone de canal est recouverte par un reste d'attaque (9') formé par une attaque avec masque d'un élément d'espacement. Cet agencement peut être produit avec un encombrement par cellule mémoire de 2 F2 (F étant la dimension structurelle minimale).
EP97915321A 1996-03-12 1997-03-03 Agencement de cellules memoire avec transistors mos verticaux et procede de production correspondant Ceased EP0886884A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19609678 1996-03-12
DE19609678A DE19609678C2 (de) 1996-03-12 1996-03-12 Speicherzellenanordnung mit streifenförmigen, parallel verlaufenden Gräben und vertikalen MOS-Transistoren und Verfahren zu deren Herstellung
PCT/DE1997/000372 WO1997034323A1 (fr) 1996-03-12 1997-03-03 Agencement de cellules memoire avec transistors mos verticaux et procede de production correspondant

Publications (1)

Publication Number Publication Date
EP0886884A1 true EP0886884A1 (fr) 1998-12-30

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP97915321A Ceased EP0886884A1 (fr) 1996-03-12 1997-03-03 Agencement de cellules memoire avec transistors mos verticaux et procede de production correspondant

Country Status (6)

Country Link
US (1) US6180979B1 (fr)
EP (1) EP0886884A1 (fr)
JP (1) JP2000506315A (fr)
KR (1) KR19990087642A (fr)
DE (1) DE19609678C2 (fr)
WO (1) WO1997034323A1 (fr)

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JP2000506315A (ja) 2000-05-23
DE19609678A1 (de) 1997-09-18
WO1997034323A1 (fr) 1997-09-18
DE19609678C2 (de) 2003-04-17
KR19990087642A (ko) 1999-12-27
US6180979B1 (en) 2001-01-30

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