CN1228818C - Method for forming funnel-shaped dielectric layer window in semiconductor - Google Patents
Method for forming funnel-shaped dielectric layer window in semiconductor Download PDFInfo
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- CN1228818C CN1228818C CN 01110219 CN01110219A CN1228818C CN 1228818 C CN1228818 C CN 1228818C CN 01110219 CN01110219 CN 01110219 CN 01110219 A CN01110219 A CN 01110219A CN 1228818 C CN1228818 C CN 1228818C
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Abstract
The present invention relates to a method for manufacturing funnel-shaped windows for dielectric layers in a semiconductor component, which comprises the following main steps: a basal dielectric layer is deposited on a wafer by an enhanced chemical vapor deposition method with electric slurry; a bottom dielectric layer is deposited on the basal dielectric layer; at least one dielectric layer with a retouched shape is deposited on the bottom dielectric layer; a top dielectric layer is deposited at the top end of the dielectric layer with a retouched shape; a light blocking layer is formed on the top dielectric layer; simultaneously, the funnel-shaped windows for dielectric layers are formed in the dielectric layers by wet etching technology and dry etching technology.
Description
The invention relates to a kind of method of modification, relate to the technology (also can be called " wet type and dry type " technology of carrying out simultaneously) of " wet type-subsidiary-dry type ", in semiconductor subassembly, interlayer hole is typically in order to link two layers of conductive layer that separated by dielectric layer.The present invention is particularly relevant for a kind of improvement the " wet type-subsidiary-dry type " etched technology (utilizing the wet type and the dry etch process of carrying out simultaneously), and available this technology is made infundibulate (taper part or the bowl-type on vertical part are partly) interlayer hole in semiconductor subassembly.The present invention also relates to a kind of new technology and improves the method that interlayer hole is made.Major advantage of the present invention be for can make the interlayer hole with smooth contour, because of can significantly improve be present between interlayer hole and the photoresist layer and Wet-type etching zone and dry-etching zone between sharp-pointed angle.Another major advantage of the present invention is to make the interlayer hole of improvement, but can significantly not improve manufacturing cost or exceedingly with process complications.
When making ultra-large type integrated (ULSI) circuit, vertically pile up or integrate a plurality of metal wire circuits or metal level, to form the multi-metal structure, become a kind of method of improving circuit performance and increasing the complexity of circuit function.The metal wire circuit is to be linked by so-called " interlayer hole ", and interlayer hole passes through dielectric layer and be sandwiched between the metal level of two-layer vicinity.
At first in dielectric layer, form a break-through hole, and the break-through hole is formed in the dielectric layer, and is positioned on the conductive layer simultaneously.Then, the depositing electrically conductive material is to form interlayer hole in the break-through hole, in order to improve the gradient coating performance of depositing electrically conductive material in the break-through hole, particularly in sputter deposition process, so the break-through hole has funnel shaped profile usually, the part of the taper of radiating such as, usually vertical following part and mouth by vertical following part.Funnel shaped break-through hole forms with so-called wet type-subsidiary-dry etch process typically, just utilizes wet etch process and dry etch process to form dielectric layer simultaneously.Dry etch process mainly is an anisotropic etching, when it is performed in the dielectric layer, can form a vertical path.Wet etch process mainly is an isotropic etching, and it can make main path perpendicular to the dry-etching direction broaden.When dry-etching carries out,, can reduce the degree of Wet-type etching accumulation by the time that reduces Wet-type etching along with the degree of depth increase of dielectric layer.Can form funnel-shaped dielectric layer window (such as, break-through hole) in such a manner, it is partly formed by two, promptly evenly the dry-etching of width (such as, down) Wet-type etching of part and taper or bowl-type width (such as, on) partly.Wet-type etching (on) partly width be by mouth (such as, dry-etching down partly with the infall of Wet-type etching upper part) increase gradually to the top surface of dielectric layer.
Shortcoming according to known wet type-subsidiary-formed funnel-shaped dielectric layer window of dry process is that taper partly has the high and steep upwards curve of a non-normal Duo partly.The part high and steep as Ci Duo can reduce gradient coating performance, but forming funnel shaped interlayer hole originally is in order to improve gradient coating performance.In order to improve gradient coating performance as far as possible in follow-up sputter deposition process, taper partly should be level and smooth more good more, and relaxed in the Promised Land greatly near the high and steep upwards curve part of the Duo on interlayer hole top.
Another shortcoming according to known wet type-subsidiary-formed funnel-shaped dielectric layer window of dry process is partly and between the Wet-type etching part sharp-pointed angle to be arranged in dry-etching, and (just interlayer hole is in the efflux angle on the surface on dielectric layer top) also has sharp-pointed angle between interlayer hole and the photoresist layer.Sharp-pointed efflux angle is also partly relevant with the high and steep upwards curve of the taper of above-mentioned interlayer hole Duo partly.These sharp-pointed angles can cause some blind spots of overall process and reduce output.
In the semi-conductor industry of high competitiveness, be important to note that each may improve the mode of output.Especially preferably those can effectively use the mode of cost.
Therefore main purpose of the present invention is to develop a kind of method of making the interlayer hole of external form improvement in semiconductor subassembly.Main order particularly of the present invention is the method that a kind of manufacturing has smooth tapered interlayer hole partly developing, and makes in follow-up sputter program, when filling up interlayer hole with conductive materials, can reach best gradient coating performance.Utilize the present invention to make interlayer hole, also can eliminate the sharp-pointed angle between Wet-type etching part and the photoresist layer, and etching part and dry-etching sharp-pointed angle partly.
The method that the present invention discloses can be summarized in following key step:
1, deposition one deck bottom dielectric layer is on wafer, and bottom dielectric layer has one first etch-rate;
2, deposit the dielectric layer of one deck profile retouching at least on bottom dielectric layer;
3, deposition one deck top dielectric is on the top that comprises the dielectric layer of one deck profile retouching at least, and top dielectric has one second etch-rate, and wherein second etch-rate is higher than first etch-rate;
4, form one deck photoresist layer on top dielectric, photoresist layer has an opening, so that can form interlayer hole in multilayer dielectric layer;
5, utilize Wet-type etching and dry-etching program simultaneously, to form funnel-shaped dielectric layer window in multilayer dielectric layer.
Before the deposition bottom dielectric layer, deposition one deck base portion dielectric layer is on wafer earlier.Side by side carry out Wet-type etching and dry-etching program, the vertical part of funnel-shaped dielectric layer window is to be formed at usually in the base portion dielectric layer, and the taper of funnel-shaped dielectric layer window partly is formed in the multilayer dielectric layer usually.Yet the vertical part of funnel-shaped dielectric layer window can partly stretch in the multilayer dielectric layer, and similarly, the taper of funnel-shaped dielectric layer window partly also can partly be stretched in the base portion dielectric layer.The preferable etch-rate of the dielectric layer of external form retouching is between first etch-rate and second etch-rate.If the number of plies of the dielectric layer of external form retouching is more than one deck, the preferable etch-rate of the dielectric layer of this multilayer external form retouching should be far away more and big more along with the distance wafer.Under situation best, for all dielectric layers, should be the etch-rate that increases continuously from the bottom dielectric layer to the top dielectric, to obtain very level and smooth interlayer hole profile.
Under normal circumstances, the more dielectric layer of deposition rate (such as, the dielectric layer and the top dielectric of base portion dielectric layer, bottom dielectric layer, one deck profile retouching at least) on wafer, be usually directed to tediously long and expensive technology.Therefore, another importance of the present invention is for forming these multilayer dielectric layer in simple relatively mode, and all these dielectric layers all are under the condition that slightly for a change deposits, and deposit with identical depositing operation.
The present invention more particularly can utilize observed pattern to adjust etch-rate, the etch-rate (dry type and wet type) of the dielectric layer of electricity slurry heavier-duty chemical vapour deposition (CVD) can be adjusted it via changing one or two technological parameter, for example the dividing potential drop of reacting gas, produce the ratio of radio-frequency power, temperature and the gas ingredients of electricity slurry, or the like.If select suitable dielectric material, then the etch-rate of dielectric material can be adjusted it via changing one or more technological parameters.To use the mode of cost effectively, by controlling these technological parameters, can form optimum mixing dielectric layer according to electricity slurry heavier-duty chemical vapor deposition method with different etch rate distribution, so that in subsequent handling, can form funnel-shaped dielectric layer window with mellow and full profile, therefore eliminated interlayer hole the top and vertical partly with the sharp angles of bowl-type junction partly.
For the present invention can be become apparent, preferred embodiment cited below particularly, and cooperate appended graphicly, be described in detail below:
The drawing explanation:
Fig. 1 is the manufacturing end view of known funnel-shaped dielectric layer window;
Fig. 2 is the manufacturing end view according to a kind of funnel-shaped dielectric layer window of preferred embodiment of the present invention.This funnel-shaped dielectric layer window has level and smooth external form, and the sharp-pointed angle of its junction has been improved;
Fig. 3 is that the dry-etching speed of silica and Wet-type etching speed are respectively with respect to the variation diagram of oxygen/silicon ratio.And oxygen/silicon ratio is in the reative cell that carries out electricity slurry heavier-duty chemical vapor deposition method, and the ratio of oxygen and silication hydrogen is to form silica on silicon base; And
Fig. 4 is for continuously changing the technological parameter of electricity slurry heavier-duty chemical vapour deposition (CVD) according to preferred embodiment of the present invention.
Description of reference numerals:
1: funnel-shaped dielectric layer window
2: the bowl-type upper part
3: vertical lower part
4: the sharp angles in interlayer hole exit
5: bowl-type partly with the sharp angles of the junction of vertical part
10: funnel-shaped dielectric layer window
11: the multilayer dielectric layer structure
12: the base portion dielectric layer
13: bottom dielectric layer
14: the dielectric layer of a plurality of profile retouchings
15: top dielectric
16: the angle in the interlayer hole exit that is improved
17: the bowl-type part that is improved and the angle of vertical part junction
Embodiment
The method that the invention provides manufacturing funnel-shaped dielectric layer window new in semiconductor subassembly is to improve the profile of interlayer hole.Funnel-shaped dielectric layer window of the present invention has more level and smooth taper partly compared to known funnel-shaped dielectric layer window, or improved the sharp angles of beginning of interlayer hole and Wet-type etching (partly) and dry-etching (such as vertical part) junction at least such as bowl-type, in follow-up sputter operation, when filling up interlayer hole, can reach best gradient coating performance with conductive materials.
Method of the present invention can be summarized in following key step:
1, deposition one deck base portion dielectric layer is on wafer;
2, deposition one deck bottom dielectric layer is on the base portion dielectric layer, and bottom dielectric layer has one first etch-rate;
3, deposit the dielectric layer of one deck profile retouching at least on bottom dielectric layer;
4, deposition one deck top dielectric is on the top that comprises the dielectric layer of one deck profile retouching at least, and top dielectric has one second etch-rate, and wherein second etch-rate is higher than first etch-rate;
5, form one deck photoresist layer on top dielectric, photoresist layer has an opening, so that can form interlayer hole in multilayer dielectric layer;
6, utilize Wet-type etching and dry etch process simultaneously, to form funnel-shaped dielectric layer window in multilayer dielectric layer.
Please refer to Fig. 1, its illustrate is the manufacturing end view of known funnel-shaped dielectric layer window 1.Interlayer hole 1 comprises that a bowl-type upper part is to wait after tropism's Wet-type etching (with dry-etching) multilayer dielectric layer to form, vertical following part 3 mainly due to anisotropic dry-etching multilayer dielectric layer after and form.Fig. 1 shows the continuous increase of profile slope of bowl-type upper part, so that in the interlayer hole exit sharp-pointed angle 4 is arranged.Fig. 1 also is presented at the bowl-type Wet-type etching partly 2 has another sharp angles 5 with the junction of vertical dry-etching part 3.
Please refer to Fig. 2, it illustrated promptly is manufacturing end view according to the funnel-shaped dielectric layer window of preferred embodiment of the present invention.Interlayer hole 10 is to be formed in the multilayer dielectric layer structure 11 of retouching, and multilayer dielectric layer structure 11 comprises dielectric layer 14 and one deck top dielectric 15 of one deck base portion dielectric layer 12, one deck bottom dielectric layer 13, the retouching of a plurality of profile.Fig. 2 shows a more level and smooth interlayer hole profile 10, and has obviously improved the sharp angles 16,17 of junction.Though base portion dielectric layer 12 is described it with bottom dielectric layer 13 with different titles,, then can merge into one deck for these two layers if deposit base portion dielectric layer 12 and bottom dielectric layer 13 with identical technological parameter.Dotted line partly is according to the formed interlayer hole profile of known technology.
Multilayer dielectric layer on the base portion dielectric layer also can be collectively referred to as non-base portion multilayer dielectric layer structure.Simultaneously carry out Wet-type etching and dry etch process, the vertical part of funnel-shaped dielectric layer window is to be formed at usually in the base portion dielectric layer, and the bowl-type of funnel-shaped dielectric layer window partly is formed in the multilayer dielectric layer on the base portion dielectric layer (such as non-base portion multilayer dielectric layer structure) usually.Yet the vertical part of funnel-shaped dielectric layer window can partly stretch in the multilayer dielectric layer, and similarly, the bowl-type of funnel-shaped dielectric layer window partly also can partly stretch in the base portion dielectric layer.The preferable etch-rate of the dielectric layer of external form retouching is between first etch-rate and second etch-rate.If the number of plies of the dielectric layer of external form retouching is more than one deck, the preferable etch-rate of the dielectric layer of this multilayer external form retouching should be far away more and big more along with the distance wafer.Under situation best, for all dielectric layers, should be the continuous etch-rate of increase from the bottom dielectric layer to the top dielectric, to obtain very level and smooth interlayer hole profile.
In technology of the present invention, the etch-rate of selected preferable dielectric material can be adjusted it along with the one or more parameters that change electricity slurry heavier-duty chemical vapor deposition method, for example the dividing potential drop of reacting gas, produce the ratio of radio-frequency power, temperature and the gas ingredients of electricity slurry, or the like.
Example as above-mentioned association, please refer to Fig. 3, its illustrate is tetraethyl-metasilicate (tetra-ethy1-ortho-silicate, TEOS) dry-etching speed and Wet-type etching speed are respectively with respect to the variation diagram of oxygen/silicon ratio, and oxygen/silicon ratio is in the reative cell that carries out electricity slurry heavier-duty chemical vapour deposition procedure, the ratio of oxygen and silication hydrogen is to form silica on silicon base.Similarly, can change the power of reative cell radio frequency or change temperature or the dividing potential drop of reacting gas is adjusted the dry-etching speed and the Wet-type etching speed of tetraethyl-metasilicate.If select suitable dielectric material, and the etch-rate of dielectric material can be adjusted it via changing one or more technological parameters, by controlling these technological parameters, can be according to electricity slurry heavier-duty chemical vapor deposition method, form optimum mixing dielectric layer with different etch rate distribution, so that in subsequent handling, can form funnel-shaped dielectric layer window with level and smooth external form, and improved interlayer hole the top and vertical partly with the sharp angles of bowl-type junction partly.
Because the present invention does not need the very big time of expense to increase the number of plies of the dielectric layer of profile retouching, in the application of reality, the process conditions that can control the rate of etch of dielectric layer are to adjust it in a continuous manner, can be divided into many steps such as technology, and each step representative increases the technological parameter of the back to back previous step of a little, so that in the dielectric layer of profile retouching, form the gradient of an etch rate distribution.Please refer to Fig. 4, technological parameter can be the dividing potential drop of reacting gas, the ratio of electric radio-frequency power, temperature and the gas ingredients of starching of generation, or the like.In case of necessity, wet dip technology can be used for the profile that the interlayer hole after the etching is modified on thin portion ground.
The bowl-type of interlayer hole partly whole profile and bowl-type partly with the angle of cut of vertical part, can further control it by the etch-rate of adjusting the base portion dielectric layer.In case of necessity, the gradient of etch rate distribution is arranged also in the base portion dielectric layer, far away more and more little such as the etch-rate of dry-etching along with the distance wafer, can further reduce bowl-type partly with the angle of cut of vertical part.Increase dry-etching speed and can reduce the required time of dry-etching, therefore, reduced Wet-type etching degree, also therefore reduced the angle of bowl-type part with vertical part perpendicular to the dry-etching direction.
Following example is with more detailed description the present invention.Though following example comprises preferred embodiment of the present invention, be the example that discloses for the present invention is described, so it is not in order to limit the present invention.
In the reative cell that carries out electricity slurry heavier-duty chemical vapour deposition procedure, by adjusting siliceous SiH
4Composition gas and oxygen containing O
2The air-flow ratio of composition gas, and deposit a series of tetraethyl-metasilicate layer on wafer.In with NH
4In the HF chemical etching liquor of F as the usefulness of buffering, test the etch-rate of the silicon oxide layer that combines by the different chemical gas phase with different chemical metering.Test result is made a summary in table one.
Table one
| The tetraethyl-metasilicate sample | Tetraethyl-metasilicate-1 | Tetraethyl-metasilicate-2 | Tetraethyl-metasilicate-3 | Tetraethyl-metasilicate-4 | Tetraethyl-metasilicate-5 |
| The relative scale of the oxygen/silicon in air-flow (1 for the highest, and 5 is minimum) | 1 | 2 | 3 | 4 | 5 |
| Etch-rate (millimicron/minute) | 898.9 | 433.9 | 332.1 | 301.1 | 273.3 |
As shown in Table 1, in electricity slurry heavier-duty chemical vapor deposition method, the ratio of the oxygen/silicon in air-flow increases, and then the etch-rate of the tetraethyl-metasilicate of corresponding deposition also increases.Carry out Wet-type etching and dry-etching simultaneously and include the wafer of the tetraethyl-metasilicate layer of different meterings, the bowl-type funnel-shaped dielectric layer window partly that has smooth contour with formation, as shown in Figure 2.Fig. 2 also shows if widen the width of vertical part (formed down partly such as, dry-etching), can not influence the overall width by the formed upper part of Wet-type etching.
Though the present invention in order to illustrate, discloses as above with preferred embodiment, various tangible improvement and the modification done according to the present invention are possible.Embodiment chosen and wherein description provide the best illustration of principle of the present invention and practical application, make anyly to have the knack of this skill person and can utilize the present invention in various embodiment, also can be used for various modifications for special purpose.Protection scope of the present invention is when being as the criterion with claims.
Claims (8)
1. method that forms funnel-shaped dielectric layer window in semiconductor is characterized in that: comprising:
(a) deposition one base portion dielectric layer is on a wafer;
(b) deposition one bottom dielectric layer is on this base portion dielectric layer, and this bottom dielectric layer has one first etch-rate;
(c) dielectric layer of at least one profile retouching of deposition is on this bottom dielectric layer;
(d) deposition one top dielectric is on this dielectric layer that one deck profile is retouched at least, wherein this top dielectric has one second etch-rate, and this second etch-rate is higher than this first etch-rate, this bottom dielectric layer wherein, this at least dielectric layer and this top dielectric of one deck profile retouching be collectively referred to as a non-base portion dielectric layer, and all the etch-rate of this dielectric layer is to adjust with at least one technological parameter that changes in the electricity slurry heavier-duty chemical vapor deposition method; And
(e) carry out a Wet-type etching and dry etch process simultaneously under a photoresist layer mated condition, to form funnel-shaped dielectric layer window, funnel-shaped dielectric layer window has a bowl-type upper part and a common vertical following part, lays respectively in this non-base portion dielectric layer and this base portion dielectric layer.
2. the method that forms funnel-shaped dielectric layer window in semiconductor as claimed in claim 1 is characterized in that: wherein this step (c) comprises the inferior step of the dielectric layer of at least two layers of this profile retouching of formation.
3. the method that forms funnel-shaped dielectric layer window in semiconductor as claimed in claim 1 is characterized in that: wherein the etch-rate of the material of this dielectric layer can be adjusted with the dividing potential drop that changes the reacting gas in the electricity slurry heavier-duty chemical vapor deposition method, the ratio that produces radio-frequency power, temperature and the gas ingredients of electricity slurry.
4. the method that forms funnel-shaped dielectric layer window in semiconductor as claimed in claim 1 is characterized in that: wherein this dielectric layer is that tetraethyl-metasilicate is that combination of gases with a siliceous composition and an oxygen containing composition deposits and gets.
5. the method that forms funnel-shaped dielectric layer window in semiconductor as claimed in claim 4, it is characterized in that: wherein this siliceous composition is SiH
4With this oxygen containing composition be O
2Gas.
6. the method that forms funnel-shaped dielectric layer window in semiconductor as claimed in claim 1 is characterized in that: wherein select this second etch-rate, feasible slope near this interlayer hole profile top reduces.
7. the method that in semiconductor, forms funnel-shaped dielectric layer window as claimed in claim 1, it is characterized in that: wherein this step (c) comprises the inferior step of the dielectric layer that forms the retouching of plural layer profile, and the dielectric layer of those profile retouchings has the etch-rate that increases continuously.
8. the method that forms funnel-shaped dielectric layer window in semiconductor as claimed in claim 1, it is characterized in that: wherein this base portion dielectric layer comprises the plural layer sublevel, and the etch-rate of those sublevels is along with the distance increase of this sublevel and this wafer and reduce.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 01110219 CN1228818C (en) | 2001-04-02 | 2001-04-02 | Method for forming funnel-shaped dielectric layer window in semiconductor |
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|---|---|---|---|
| CN 01110219 CN1228818C (en) | 2001-04-02 | 2001-04-02 | Method for forming funnel-shaped dielectric layer window in semiconductor |
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| CN1228818C true CN1228818C (en) | 2005-11-23 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US7550794B2 (en) | 2002-09-20 | 2009-06-23 | Idc, Llc | Micromechanical systems device comprising a displaceable electrode and a charge-trapping layer |
| US7781850B2 (en) | 2002-09-20 | 2010-08-24 | Qualcomm Mems Technologies, Inc. | Controlling electromechanical behavior of structures within a microelectromechanical systems device |
| EP1855142A3 (en) | 2004-07-29 | 2008-07-30 | Idc, Llc | System and method for micro-electromechanical operating of an interferometric modulator |
| WO2007013992A1 (en) | 2005-07-22 | 2007-02-01 | Qualcomm Incorporated | Support structure for mems device and methods therefor |
| EP2495212A3 (en) | 2005-07-22 | 2012-10-31 | QUALCOMM MEMS Technologies, Inc. | Mems devices having support structures and methods of fabricating the same |
| US7795061B2 (en) | 2005-12-29 | 2010-09-14 | Qualcomm Mems Technologies, Inc. | Method of creating MEMS device cavities by a non-etching process |
| US7382515B2 (en) | 2006-01-18 | 2008-06-03 | Qualcomm Mems Technologies, Inc. | Silicon-rich silicon nitrides as etch stops in MEMS manufacture |
| US7450295B2 (en) | 2006-03-02 | 2008-11-11 | Qualcomm Mems Technologies, Inc. | Methods for producing MEMS with protective coatings using multi-component sacrificial layers |
| US7719752B2 (en) | 2007-05-11 | 2010-05-18 | Qualcomm Mems Technologies, Inc. | MEMS structures, methods of fabricating MEMS components on separate substrates and assembly of same |
| US7851239B2 (en) | 2008-06-05 | 2010-12-14 | Qualcomm Mems Technologies, Inc. | Low temperature amorphous silicon sacrificial layer for controlled adhesion in MEMS devices |
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