US20090023283A1 - Interconnection process - Google Patents
Interconnection process Download PDFInfo
- Publication number
- US20090023283A1 US20090023283A1 US11/778,844 US77884407A US2009023283A1 US 20090023283 A1 US20090023283 A1 US 20090023283A1 US 77884407 A US77884407 A US 77884407A US 2009023283 A1 US2009023283 A1 US 2009023283A1
- Authority
- US
- United States
- Prior art keywords
- layer
- hard mask
- dielectric
- opening
- mask layer
- 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.)
- Abandoned
Links
Images
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/70—Manufacture or treatment of devices consisting of a plurality of solid state components formed in or on a common substrate or of parts thereof; Manufacture of integrated circuit devices or of parts thereof
- H01L21/71—Manufacture of specific parts of devices defined in group H01L21/70
- H01L21/768—Applying interconnections to be used for carrying current between separate components within a device comprising conductors and dielectrics
- H01L21/76801—Applying interconnections to be used for carrying current between separate components within a device comprising conductors and dielectrics characterised by the formation and the after-treatment of the dielectrics, e.g. smoothing
- H01L21/76802—Applying interconnections to be used for carrying current between separate components within a device comprising conductors and dielectrics characterised by the formation and the after-treatment of the dielectrics, e.g. smoothing by forming openings in dielectrics
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
- H01L21/04—Manufacture or treatment of semiconductor devices or of parts thereof the devices having at least one potential-jump barrier or surface barrier, e.g. PN junction, depletion layer or carrier concentration layer
- H01L21/18—Manufacture or treatment of semiconductor devices or of parts thereof the devices having at least one potential-jump barrier or surface barrier, e.g. PN junction, depletion layer or carrier concentration layer the devices having semiconductor bodies comprising elements of Group IV of the Periodic System or AIIIBV compounds with or without impurities, e.g. doping materials
- H01L21/30—Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/26
- H01L21/31—Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/26 to form insulating layers thereon, e.g. for masking or by using photolithographic techniques; After treatment of these layers; Selection of materials for these layers
- H01L21/3105—After-treatment
- H01L21/311—Etching the insulating layers by chemical or physical means
- H01L21/31144—Etching the insulating layers by chemical or physical means using masks
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/70—Manufacture or treatment of devices consisting of a plurality of solid state components formed in or on a common substrate or of parts thereof; Manufacture of integrated circuit devices or of parts thereof
- H01L21/71—Manufacture of specific parts of devices defined in group H01L21/70
- H01L21/768—Applying interconnections to be used for carrying current between separate components within a device comprising conductors and dielectrics
- H01L21/76801—Applying interconnections to be used for carrying current between separate components within a device comprising conductors and dielectrics characterised by the formation and the after-treatment of the dielectrics, e.g. smoothing
- H01L21/76802—Applying interconnections to be used for carrying current between separate components within a device comprising conductors and dielectrics characterised by the formation and the after-treatment of the dielectrics, e.g. smoothing by forming openings in dielectrics
- H01L21/76807—Applying interconnections to be used for carrying current between separate components within a device comprising conductors and dielectrics characterised by the formation and the after-treatment of the dielectrics, e.g. smoothing by forming openings in dielectrics for dual damascene structures
- H01L21/76808—Applying interconnections to be used for carrying current between separate components within a device comprising conductors and dielectrics characterised by the formation and the after-treatment of the dielectrics, e.g. smoothing by forming openings in dielectrics for dual damascene structures involving intermediate temporary filling with material
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/70—Manufacture or treatment of devices consisting of a plurality of solid state components formed in or on a common substrate or of parts thereof; Manufacture of integrated circuit devices or of parts thereof
- H01L21/71—Manufacture of specific parts of devices defined in group H01L21/70
- H01L21/768—Applying interconnections to be used for carrying current between separate components within a device comprising conductors and dielectrics
- H01L21/76801—Applying interconnections to be used for carrying current between separate components within a device comprising conductors and dielectrics characterised by the formation and the after-treatment of the dielectrics, e.g. smoothing
- H01L21/76802—Applying interconnections to be used for carrying current between separate components within a device comprising conductors and dielectrics characterised by the formation and the after-treatment of the dielectrics, e.g. smoothing by forming openings in dielectrics
- H01L21/76807—Applying interconnections to be used for carrying current between separate components within a device comprising conductors and dielectrics characterised by the formation and the after-treatment of the dielectrics, e.g. smoothing by forming openings in dielectrics for dual damascene structures
- H01L21/76811—Applying interconnections to be used for carrying current between separate components within a device comprising conductors and dielectrics characterised by the formation and the after-treatment of the dielectrics, e.g. smoothing by forming openings in dielectrics for dual damascene structures involving multiple stacked pre-patterned masks
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/70—Manufacture or treatment of devices consisting of a plurality of solid state components formed in or on a common substrate or of parts thereof; Manufacture of integrated circuit devices or of parts thereof
- H01L21/71—Manufacture of specific parts of devices defined in group H01L21/70
- H01L21/768—Applying interconnections to be used for carrying current between separate components within a device comprising conductors and dielectrics
- H01L21/76801—Applying interconnections to be used for carrying current between separate components within a device comprising conductors and dielectrics characterised by the formation and the after-treatment of the dielectrics, e.g. smoothing
- H01L21/76802—Applying interconnections to be used for carrying current between separate components within a device comprising conductors and dielectrics characterised by the formation and the after-treatment of the dielectrics, e.g. smoothing by forming openings in dielectrics
- H01L21/76807—Applying interconnections to be used for carrying current between separate components within a device comprising conductors and dielectrics characterised by the formation and the after-treatment of the dielectrics, e.g. smoothing by forming openings in dielectrics for dual damascene structures
- H01L21/76813—Applying interconnections to be used for carrying current between separate components within a device comprising conductors and dielectrics characterised by the formation and the after-treatment of the dielectrics, e.g. smoothing by forming openings in dielectrics for dual damascene structures involving a partial via etch
Definitions
- the present invention relates to a semiconductor manufacturing process. More particularly, the present invention relates to an interconnection process.
- VLSI very-large scale integrated
- a damascene technique is often employed.
- openings are formed in a dielectric layer in most cases, and metal is then filled in the openings to form an interconnect.
- copper conductive wires are usually fabricated by implementing the damascene process instead of the conventional etching process.
- a metal hard mask layer made of titanium nitride (TiN) is formed on a dielectric layer and a dielectric hard mask layer is formed on the metal hard mask layer before performing an etching process to form openings.
- a first etching process is carried out in a first reaction chamber to pattern the dielectric hard mask layer.
- a second etching process is implemented with use of the patterned dielectric hard mask layer as a mask in a second reaction chamber to pattern the metal hard mask layer.
- another etching process is performed with use of the patterned dielectric hard mask layer and the patterned metal hard mask layer as a mask to form the opening in the dielectric layer.
- a SiON layer may be formed on the metal hard mask layer, and the SiON layer and the metal hard mask layer are respectively etched with use of a CF 4 -containing etching gas and a Cl 2 -containing etching gas in one reaction chamber, so as to form a patterned SiON mask layer and a patterned metal hard mask layer. Thereafter, another etching process is performed with use of the patterned SiON mask layer and the patterned metal hard mask layer as a mask to form the opening in the dielectric layer.
- CF 4 -containing etching gas and the Cl 2 -containing etching gas are utilized to respectively etch the SiON layer and the metal hard mask layer in the reaction chamber, a fluorinated polymer and a chlorinated polymer may be simultaneously generated in the reaction chamber, impairing the particle performance during the etching process and adversely affecting the subsequent manufacturing process.
- the present invention is directed to an interconnection process capable of improving the particle performance during an etching process.
- the present invention is further directed to an interconnection process able to simplify a manufacturing process.
- the present invention is further directed to an interconnection process capable of improving the particle performance in a reaction chamber and simplifying a manufacturing process.
- the present invention provides an interconnection process.
- the interconnection process includes firstly providing a substrate having a conductive region formed therein. Then, a dielectric layer is formed on the substrate. Next, a patterned metal hard mask layer having a trench opening is formed on the dielectric layer. After that, a dielectric hard mask layer is formed conformally on the patterned metal hard mask layer and filled in the trench opening. Thereafter, a photoresist pattern is defined to remove a portion of the dielectric hard mask layer and a portion of the dielectric layer in the trench opening to form a first opening in the dielectric layer.
- a first etching process is performed with use of the patterned metal hard mask layer as a mask to form a trench and a second opening extending downward from the first opening in the dielectric layer.
- the second opening exposes the conductive region.
- a conductive layer is formed in the trench and the second opening.
- the material of the dielectric hard mask layer is, for example, silicon oxide.
- the material of the patterned metal hard mask layer is, for example, TiN, tantalum nitride (TaN) or a titanium-tungsten alloy.
- the conductive region is, for example, a conductive wire or an electrode.
- the material of the dielectric layer is, for example, a dielectric material with low dielectric constant.
- the material of the conductive layer is, for example, copper or tungsten.
- a method of forming the first opening includes, for example, firstly forming a patterned photoresist layer on the dielectric hard mask layer. Then, a second etching process is performed with use of the patterned photoresist layer as a mask to remove a portion of the dielectric hard mask layer and a portion of the dielectric layer. Finally, the patterned photoresist layer is removed.
- a cap layer may be further formed on the substrate before the step of forming the dielectric layer.
- a polishing stop layer or a glue layer may be further formed on the dielectric layer after the dielectric layer is formed and before the patterned metal hard mask layer is formed.
- a method of forming the conductive layer includes, for example, forming a conductive material layer over the substrate. Thereafter, a planarization process is performed to remove the conductive material layer outside the trench and the second opening.
- the present invention further provides an interconnection process.
- the interconnection process includes firstly providing a substrate having a conductive region formed therein. Then, a dielectric layer is formed on the substrate. Next, a patterned metal hard mask layer having a trench opening is formed on the dielectric layer. After that, a dielectric hard mask layer is formed conformally on the patterned metal hard mask layer and filled in the trench opening. Next, a photoresist layer is defined to remove a portion of the dielectric hard mask layer and a portion of the dielectric layer in the trench opening to form an opening. The opening exposes the conductive region. Thereafter, a passivation layer is formed in the opening. The photoresist layer is removed.
- a first etching process is performed with use of the patterned metal hard mask layer as a mask to form a trench in the dielectric layer. Afterwards, the passivation layer is removed. Ultimately, a conductive layer is formed in the trench and the opening.
- a method of forming the opening includes, for example, firstly forming a patterned photoresist layer on the dielectric hard mask layer. Then, a second etching process is performed with use of the patterned photoresist layer as a mask to remove a portion of the dielectric hard mask layer and a portion of the dielectric layer until the conductive region is exposed. Finally, the patterned photoresist layer is removed.
- a method of forming the passivation layer includes, for example, forming a passivation material layer over the substrate. After that, an etching back process is performed to remove the passivation material layer outside the opening.
- a method of forming the conductive layer includes, for example, forming a conductive material layer over the substrate. Thereafter, a planarization process is performed to remove the conductive material layer outside the trench and the opening.
- the metal hard mask layer formed on the dielectric layer is patterned. Thereafter, the dielectric hard mask layer is conformally formed on the patterned metal hard mask layer, and a photolithography process and an etching process are directly implemented to form the opening.
- a photolithography process and an etching process are directly implemented to form the opening.
- FIGS. 1A through 1E are cross-sectional schematic views illustrating a dual damascene process according to one embodiment of the present invention.
- FIGS. 2A through 2D are cross-sectional schematic views illustrating a dual damascene process according to another embodiment of the present invention.
- FIGS. 3A through 3D are cross-sectional schematic views illustrating a single damascene process according to another embodiment of the present invention.
- the interconnection process of the present invention will be described through a dual damascene process.
- FIGS. 1A through 1E are cross-sectional schematic views illustrating a dual damascene process according to one embodiment of the present invention.
- a substrate 100 having a conductive region 102 formed therein is provided.
- the substrate 100 is, for example, a silicon substrate.
- the conductive region 102 may be an electrode or a conductive wire.
- a cap layer 104 is alternatively formed on the substrate 100 .
- a dielectric layer 106 is formed over the substrate 100 .
- the material of the dielectric layer 106 is, for example, a dielectric material with low dielectric constant, and a method of forming the dielectric layer 106 includes performing a chemical vapor deposition (CVD) process, for example.
- CVD chemical vapor deposition
- a polishing stop layer or glue layer 108 is selectively formed on the dielectric layer 106 .
- the material of the polishing stop layer or glue layer 108 is, for example, TEOS.
- a metal hard mask layer 110 is formed on the polishing stop layer 108 .
- the material of the metal hard mask layer 110 is, for example, TiN, TaN or a titanium-tungsten alloy, and a method of forming the metal hard mask layer 110 includes implementing the CVD process, for example.
- the material of the cap layer 104 and the polishing stop layer 108 and the method of forming the same are well known to people skilled in the art, and thus no further description is provided hereinafter.
- a pattern photoresist layer (not shown) is formed on the metal hard mask layer 110 , and performing an etching process with use of the pattern photoresist layer as a mask to form a patterned metal hard mask layer 110 a having a trench opening.
- the patterned metal hard mask layer 110 a exposes a region for forming a trench in the subsequent process.
- a dielectric hard mask layer 112 is formed conformally on the patterned metal hard mask layer 110 a and filled in the trench opening.
- the material of the dielectric hard mask layer 112 is, for example, silicon oxide, and a method of forming the dielectric hard mask layer 112 includes performing the CVD process, for example.
- the material of the dielectric hard mask layer 112 is, for example, silicon oxide using a tetraethyl orthosilicate (TEOS) as a gas source.
- TEOS tetraethyl orthosilicate
- the material of the dielectric hard mask layer 112 may be silicon carbide (SiC), SiCN or other appropriate dielectric materials.
- the dielectric hard mask layer 112 is employed to prevent the metal material of the patterned metal hard mask layer 110 a and the etching gas from reacting and generating by-products not apt to volatilize in the subsequent etching process.
- the by-products include titanium fluoride (TiF 3 ) and so on.
- a patterned photoresist layer 114 is formed on the dielectric hard mask layer 112 .
- the patterned photoresist layer 114 exposes a region for forming an opening in the subsequent process.
- another etching process is performed with use of the patterned photoresist layer 114 as a mask to remove a portion of the dielectric hard mask layer 112 , a portion of the polishing stop layer 108 and a portion of the dielectric layer 106 and to form an opening 116 .
- the patterned photoresist layer 114 is removed.
- Another etching process is then carried out with use of the patterned metal hard mask layer 110 a as the mask to form a trench 118 and an opening 120 extending downward from opening 116 in the dielectric layer 106 in the range of the trench opening of the patterned metal hard mask layer.
- the opening 120 exposes a portion of the cap layer 104 above the conductive region 102 .
- Both the dielectric hard mask-layer 112 and the dielectric layer 106 are made of the dielectric materials, and thus the dielectric hard mask layer 112 on the patterned metal hard mask layer 110 a is also removed during the etching process.
- the cap layer 104 exposed by the opening 120 is removed to expose a portion of the conductive region 102 .
- the metal hard mask layer 110 is patterned before the formation of the dielectric hard mask layer 112 according to the present invention. Afterwards, a photolithography process and an etching process are directly carried out to form the trench 118 and the opening 120 after the formation of the dielectric hard mask layer 112 . Here, the process of patterning the dielectric hard mask layer 112 is omitted.
- oxynitride is replaced by oxide, it is not required to use F-containing and Cl-containing gases for oxynitride to pattern the dielectric hard mask layer and the metal hard mask layer, such that a variety of particles can be prevented from generating in a reaction chamber, improving the particle performance during the etching process.
- a conductive material layer (not shown) is formed over the substrate 100 to fill the trench 118 and the opening 120 .
- the material of the conductive material layer is, for example, copper or tungsten.
- a planarization process is performed by implementing a chemical mechanical polishing (CMP) step to remove the conductive material layer outside the trench 118 and the opening 120 to the surface of the polishing stop layer 108 , so as to form a conductive layer 122 in the trench 118 and the opening 120 .
- CMP chemical mechanical polishing
- FIGS. 2A through 2D are cross-sectional schematic views illustrating a dual damascene process according to another embodiment of the present invention.
- FIG. 2A depicts a process performed after the process illustrated in FIG. 1B .
- a patterned photoresist layer 114 is formed on the dielectric hard mask layer 112 .
- the patterned photoresist layer 114 exposes a region for forming an opening in the subsequent process.
- etching process is performed with use of the patterned photoresist layer 114 as a mask to remove a portion of the dielectric hard mask layer 112 , a portion of the polishing stop layer 108 and a portion of the dielectric layer 106 until a portion of the cap layer 104 on the conductive region 102 is exposed, such that an opening 124 is formed.
- the patterned photoresist layer 114 is removed.
- a passivation material layer (not shown) is then formed over the substrate 100 to fill the opening 124 .
- an etching back process is implemented to form a passivation layer 126 .
- an etching rate of the passivation layer 126 is less than or equal to that of the dielectric layer 106 .
- etching process is performed with use of the patterned metal hard mask 110 a layer as the mask to form a trench 128 in the dielectric layer 106 .
- the etching rate of the passivation layer 126 is less than or equal to that of the dielectric layer 106 . Therefore, as a portion of the dielectric layer 106 is removed to form the trench 128 , the passivation layer 126 remains in the opening 124 to prevent the cap layer 104 at a bottom of the opening 124 is etched.
- the passivation layer 126 is removed.
- a conductive layer 122 is then constructed in the trench 128 and the opening 124 , such that the dual damascene process is completed.
- interconnection process of the present invention can be applied not only to said dual damascene process but also to a single damascene process.
- FIGS. 3A through 3D are cross-sectional schematic illustrating a single damascene process according to another embodiment of the present invention.
- a substrate 300 having a conductive region 302 formed therein is provided.
- the substrate 300 is, for example, a silicon substrate.
- the conductive region 302 may be an electrode or a conductive wire.
- a cap layer 304 is alternatively formed on the substrate 300 .
- a dielectric layer 306 is formed over the substrate 300 .
- the material of the dielectric layer 306 is, for example, a dielectric material with low dielectric constant, and a method of forming the dielectric layer 306 includes performing a CVD process, for example.
- a polishing stop layer 308 is selectively formed on the dielectric layer 306 .
- a metal hard mask layer 310 is formed on the polishing stop layer 308 .
- the material of the metal hard mask layer 310 is, for example, TiN, TaN or a titanium-tungsten alloy, and a method of forming the metal hard mask layer 310 includes implementing the CVD process, for example.
- the material of the cap layer 304 and the polishing stop layer 308 and the method of forming the same are well known to people skilled in the art, and thus no further description is provided hereinafter.
- the metal hard mask layer 310 is patterned to form a patterned metal hard mask layer 310 a having a trench opening.
- the patterned metal hard mask layer 310 a exposes a region for forming an opening in a subsequent process.
- a dielectric hard mask layer 312 is formed conformally over the patterned metal hard mask layer 310 a and filled in the trench opening.
- the material of the dielectric hard mask layer 312 is, for example, silicon oxide, and a method of forming the dielectric hard mask layer 312 includes performing the CVD process, for example.
- the material of the dielectric hard mask layer 312 is, for example, silicon oxide using TEOS as a gas source.
- it is certain that the material of the dielectric hard mask layer 312 may be silicon carbide (SiC), SiCN or other appropriate dielectric materials.
- etching process is then carried out with use of the patterned metal hard mask layer 310 a as the mask to form an opening 313 in the dielectric layer 306 .
- the opening 313 exposes a portion of the cap layer 304 above the conductive region 302 .
- the cap layer 304 exposed by the opening 312 is removed to expose a portion of the conductive region 302 .
- a conductive layer 314 is formed in the opening 313 , such that the conductive layer 314 can be electrically connected to the conductive region 302 , and thereby the single damascene process is completed.
Abstract
An interconnection process is described. A substrate having a conductive region formed therein is provided. A dielectric layer is formed on the substrate. A patterned metal hard mask layer having a trench opening is formed on the dielectric layer. A dielectric hard mask layer is formed conformally on the patterned metal hard mask layer and filled in the trench opening. A photoresist pattern is defined to remove a portion of the dielectric hard mask layer and a portion of the dielectric layer to form a first opening in the dielectric layer. The photoresist pattern is removed. A first etching process is performed using the patterned metal hard mask layer as a mask to form a trench and a second opening extending downward from the first opening in the dielectric layer. The second opening exposes the conductive region. A conductive layer is formed in the trench and the second opening.
Description
- 1. Field of the Invention
- The present invention relates to a semiconductor manufacturing process. More particularly, the present invention relates to an interconnection process.
- 2. Description of Related Art
- With the development of semiconductor technology, the sizes of the semiconductor devices have become smaller and smaller. As the integration degree of integrated circuits (IC) is up to a certain level, a die surface is insufficient for forming all interconnects thereon. Hence, multi-level interconnects are adopted in current very-large scale integrated (VLSI) circuits.
- As regards to the current process of manufacturing a metallic interconnect, a damascene technique is often employed. In a damascene process, openings are formed in a dielectric layer in most cases, and metal is then filled in the openings to form an interconnect. Furthermore, due to the difficulties in etching copper in the current semiconductor production process, copper conductive wires are usually fabricated by implementing the damascene process instead of the conventional etching process.
- In the normal damascene process, a metal hard mask layer made of titanium nitride (TiN) is formed on a dielectric layer and a dielectric hard mask layer is formed on the metal hard mask layer before performing an etching process to form openings. Next, a first etching process is carried out in a first reaction chamber to pattern the dielectric hard mask layer. Afterwards, a second etching process is implemented with use of the patterned dielectric hard mask layer as a mask in a second reaction chamber to pattern the metal hard mask layer. Thereafter, another etching process is performed with use of the patterned dielectric hard mask layer and the patterned metal hard mask layer as a mask to form the opening in the dielectric layer.
- Besides, to simplify the etching process in the aforementioned fabrication, a SiON layer may be formed on the metal hard mask layer, and the SiON layer and the metal hard mask layer are respectively etched with use of a CF4-containing etching gas and a Cl2-containing etching gas in one reaction chamber, so as to form a patterned SiON mask layer and a patterned metal hard mask layer. Thereafter, another etching process is performed with use of the patterned SiON mask layer and the patterned metal hard mask layer as a mask to form the opening in the dielectric layer.
- However, since the CF4-containing etching gas and the Cl2-containing etching gas are utilized to respectively etch the SiON layer and the metal hard mask layer in the reaction chamber, a fluorinated polymer and a chlorinated polymer may be simultaneously generated in the reaction chamber, impairing the particle performance during the etching process and adversely affecting the subsequent manufacturing process.
- The present invention is directed to an interconnection process capable of improving the particle performance during an etching process.
- The present invention is further directed to an interconnection process able to simplify a manufacturing process.
- The present invention is further directed to an interconnection process capable of improving the particle performance in a reaction chamber and simplifying a manufacturing process.
- The present invention provides an interconnection process. The interconnection process includes firstly providing a substrate having a conductive region formed therein. Then, a dielectric layer is formed on the substrate. Next, a patterned metal hard mask layer having a trench opening is formed on the dielectric layer. After that, a dielectric hard mask layer is formed conformally on the patterned metal hard mask layer and filled in the trench opening. Thereafter, a photoresist pattern is defined to remove a portion of the dielectric hard mask layer and a portion of the dielectric layer in the trench opening to form a first opening in the dielectric layer. Afterwards, a first etching process is performed with use of the patterned metal hard mask layer as a mask to form a trench and a second opening extending downward from the first opening in the dielectric layer. The second opening exposes the conductive region. Ultimately, a conductive layer is formed in the trench and the second opening.
- According to one embodiment of the present invention, the material of the dielectric hard mask layer is, for example, silicon oxide.
- According to one embodiment of the present invention, the material of the patterned metal hard mask layer is, for example, TiN, tantalum nitride (TaN) or a titanium-tungsten alloy.
- According to one embodiment of the present invention, the conductive region is, for example, a conductive wire or an electrode.
- According to one embodiment of the present invention, the material of the dielectric layer is, for example, a dielectric material with low dielectric constant.
- According to one embodiment of the present invention, the material of the conductive layer is, for example, copper or tungsten.
- According to one embodiment of the present invention, a method of forming the first opening includes, for example, firstly forming a patterned photoresist layer on the dielectric hard mask layer. Then, a second etching process is performed with use of the patterned photoresist layer as a mask to remove a portion of the dielectric hard mask layer and a portion of the dielectric layer. Finally, the patterned photoresist layer is removed.
- According to one embodiment of the present invention, a cap layer may be further formed on the substrate before the step of forming the dielectric layer.
- According to one embodiment of the present invention, a polishing stop layer or a glue layer may be further formed on the dielectric layer after the dielectric layer is formed and before the patterned metal hard mask layer is formed.
- According to one embodiment of the present invention, a method of forming the conductive layer includes, for example, forming a conductive material layer over the substrate. Thereafter, a planarization process is performed to remove the conductive material layer outside the trench and the second opening.
- The present invention further provides an interconnection process. The interconnection process includes firstly providing a substrate having a conductive region formed therein. Then, a dielectric layer is formed on the substrate. Next, a patterned metal hard mask layer having a trench opening is formed on the dielectric layer. After that, a dielectric hard mask layer is formed conformally on the patterned metal hard mask layer and filled in the trench opening. Next, a photoresist layer is defined to remove a portion of the dielectric hard mask layer and a portion of the dielectric layer in the trench opening to form an opening. The opening exposes the conductive region. Thereafter, a passivation layer is formed in the opening. The photoresist layer is removed. Then, a first etching process is performed with use of the patterned metal hard mask layer as a mask to form a trench in the dielectric layer. Afterwards, the passivation layer is removed. Ultimately, a conductive layer is formed in the trench and the opening.
- According to one embodiment of the present invention, a method of forming the opening includes, for example, firstly forming a patterned photoresist layer on the dielectric hard mask layer. Then, a second etching process is performed with use of the patterned photoresist layer as a mask to remove a portion of the dielectric hard mask layer and a portion of the dielectric layer until the conductive region is exposed. Finally, the patterned photoresist layer is removed.
- According to one embodiment of the present invention, a method of forming the passivation layer includes, for example, forming a passivation material layer over the substrate. After that, an etching back process is performed to remove the passivation material layer outside the opening.
- According to one embodiment of the present invention, a method of forming the conductive layer includes, for example, forming a conductive material layer over the substrate. Thereafter, a planarization process is performed to remove the conductive material layer outside the trench and the opening.
- According to the present invention, before the formation of the opening, the metal hard mask layer formed on the dielectric layer is patterned. Thereafter, the dielectric hard mask layer is conformally formed on the patterned metal hard mask layer, and a photolithography process and an etching process are directly implemented to form the opening. Through omitting the process of patterning the dielectric hard mask layer and because oxynitride is replaced by the dielectric hard mask layer, the reaction that the floride-containing etching gases for oxinitride/patterned metal hard mask layer react with metal can be prevented, and a variety of particles in the etching chamber are prevented from generating, improving the particle performance during the etching process.
- In order to the make the aforementioned and other objects, features and advantages of the present invention comprehensible, several embodiments accompanied with figures are described in detail below.
-
FIGS. 1A through 1E are cross-sectional schematic views illustrating a dual damascene process according to one embodiment of the present invention. -
FIGS. 2A through 2D are cross-sectional schematic views illustrating a dual damascene process according to another embodiment of the present invention. -
FIGS. 3A through 3D are cross-sectional schematic views illustrating a single damascene process according to another embodiment of the present invention. - The interconnection process of the present invention will be described through a dual damascene process.
-
FIGS. 1A through 1E are cross-sectional schematic views illustrating a dual damascene process according to one embodiment of the present invention. First, referring toFIG. 1A , asubstrate 100 having aconductive region 102 formed therein is provided. Thesubstrate 100 is, for example, a silicon substrate. Theconductive region 102 may be an electrode or a conductive wire. Next, acap layer 104 is alternatively formed on thesubstrate 100. Then, adielectric layer 106 is formed over thesubstrate 100. The material of thedielectric layer 106 is, for example, a dielectric material with low dielectric constant, and a method of forming thedielectric layer 106 includes performing a chemical vapor deposition (CVD) process, for example. Thereafter, a polishing stop layer orglue layer 108 is selectively formed on thedielectric layer 106. The material of the polishing stop layer orglue layer 108 is, for example, TEOS. After that, a metalhard mask layer 110 is formed on the polishingstop layer 108. The material of the metalhard mask layer 110 is, for example, TiN, TaN or a titanium-tungsten alloy, and a method of forming the metalhard mask layer 110 includes implementing the CVD process, for example. In addition, the material of thecap layer 104 and the polishingstop layer 108 and the method of forming the same are well known to people skilled in the art, and thus no further description is provided hereinafter. - Afterwards, referring to
FIG. 1B , a pattern photoresist layer (not shown) is formed on the metalhard mask layer 110, and performing an etching process with use of the pattern photoresist layer as a mask to form a patterned metalhard mask layer 110 a having a trench opening. The patterned metalhard mask layer 110 a exposes a region for forming a trench in the subsequent process. After that, a dielectrichard mask layer 112 is formed conformally on the patterned metalhard mask layer 110 a and filled in the trench opening. The material of the dielectrichard mask layer 112 is, for example, silicon oxide, and a method of forming the dielectrichard mask layer 112 includes performing the CVD process, for example. In the present embodiment, the material of the dielectrichard mask layer 112 is, for example, silicon oxide using a tetraethyl orthosilicate (TEOS) as a gas source. However, in other embodiments, it is certain that the material of the dielectrichard mask layer 112 may be silicon carbide (SiC), SiCN or other appropriate dielectric materials. The dielectrichard mask layer 112 is employed to prevent the metal material of the patterned metalhard mask layer 110 a and the etching gas from reacting and generating by-products not apt to volatilize in the subsequent etching process. The by-products include titanium fluoride (TiF3) and so on. - Thereafter, as shown in
FIG. 1C , a patternedphotoresist layer 114 is formed on the dielectrichard mask layer 112. The patternedphotoresist layer 114 exposes a region for forming an opening in the subsequent process. Next, another etching process is performed with use of the patternedphotoresist layer 114 as a mask to remove a portion of the dielectrichard mask layer 112, a portion of the polishingstop layer 108 and a portion of thedielectric layer 106 and to form anopening 116. - After that, referring to
FIG. 1D , the patternedphotoresist layer 114 is removed. Another etching process is then carried out with use of the patterned metalhard mask layer 110 a as the mask to form atrench 118 and anopening 120 extending downward from opening 116 in thedielectric layer 106 in the range of the trench opening of the patterned metal hard mask layer. Here, theopening 120 exposes a portion of thecap layer 104 above theconductive region 102. Both the dielectric hard mask-layer 112 and thedielectric layer 106 are made of the dielectric materials, and thus the dielectrichard mask layer 112 on the patterned metalhard mask layer 110 a is also removed during the etching process. Next, thecap layer 104 exposed by theopening 120 is removed to expose a portion of theconductive region 102. - It should be noted that the metal
hard mask layer 110 is patterned before the formation of the dielectrichard mask layer 112 according to the present invention. Afterwards, a photolithography process and an etching process are directly carried out to form thetrench 118 and theopening 120 after the formation of the dielectrichard mask layer 112. Here, the process of patterning the dielectrichard mask layer 112 is omitted. - Moreover, in the aforesaid process, because oxynitride is replaced by oxide, it is not required to use F-containing and Cl-containing gases for oxynitride to pattern the dielectric hard mask layer and the metal hard mask layer, such that a variety of particles can be prevented from generating in a reaction chamber, improving the particle performance during the etching process.
- After that, referring to
FIG. 1E , a conductive material layer (not shown) is formed over thesubstrate 100 to fill thetrench 118 and theopening 120. The material of the conductive material layer is, for example, copper or tungsten. Thereafter, a planarization process is performed by implementing a chemical mechanical polishing (CMP) step to remove the conductive material layer outside thetrench 118 and theopening 120 to the surface of the polishingstop layer 108, so as to form aconductive layer 122 in thetrench 118 and theopening 120. Thereby, theconductive layer 122 can be electrically connected to theconductive region 102, and the dual damascene process is then completed. -
FIGS. 2A through 2D are cross-sectional schematic views illustrating a dual damascene process according to another embodiment of the present invention. First, please refer toFIG. 2A which depicts a process performed after the process illustrated inFIG. 1B . InFIG. 2A , a patternedphotoresist layer 114 is formed on the dielectrichard mask layer 112. The patternedphotoresist layer 114 exposes a region for forming an opening in the subsequent process. Next, another etching process is performed with use of the patternedphotoresist layer 114 as a mask to remove a portion of the dielectrichard mask layer 112, a portion of the polishingstop layer 108 and a portion of thedielectric layer 106 until a portion of thecap layer 104 on theconductive region 102 is exposed, such that anopening 124 is formed. - Afterwards, as shown in
FIG. 2B , the patternedphotoresist layer 114 is removed. A passivation material layer (not shown) is then formed over thesubstrate 100 to fill theopening 124. Thereafter, an etching back process is implemented to form apassivation layer 126. Here, an etching rate of thepassivation layer 126 is less than or equal to that of thedielectric layer 106. - Then, referring to
FIG. 2C , another etching process is performed with use of the patterned metalhard mask 110 a layer as the mask to form atrench 128 in thedielectric layer 106. It should be noted that the etching rate of thepassivation layer 126 is less than or equal to that of thedielectric layer 106. Therefore, as a portion of thedielectric layer 106 is removed to form thetrench 128, thepassivation layer 126 remains in theopening 124 to prevent thecap layer 104 at a bottom of theopening 124 is etched. - Next, referring to
FIG. 2D , thepassivation layer 126 is removed. Aconductive layer 122 is then constructed in thetrench 128 and theopening 124, such that the dual damascene process is completed. - Note that the interconnection process of the present invention can be applied not only to said dual damascene process but also to a single damascene process.
-
FIGS. 3A through 3D are cross-sectional schematic illustrating a single damascene process according to another embodiment of the present invention. First, referring toFIG. 3A , asubstrate 300 having aconductive region 302 formed therein is provided. Thesubstrate 300 is, for example, a silicon substrate. Theconductive region 302 may be an electrode or a conductive wire. Next, acap layer 304 is alternatively formed on thesubstrate 300. Then, adielectric layer 306 is formed over thesubstrate 300. The material of thedielectric layer 306 is, for example, a dielectric material with low dielectric constant, and a method of forming thedielectric layer 306 includes performing a CVD process, for example. Thereafter, a polishingstop layer 308 is selectively formed on thedielectric layer 306. After that, a metalhard mask layer 310 is formed on the polishingstop layer 308. The material of the metalhard mask layer 310 is, for example, TiN, TaN or a titanium-tungsten alloy, and a method of forming the metalhard mask layer 310 includes implementing the CVD process, for example. Likewise, the material of thecap layer 304 and the polishingstop layer 308 and the method of forming the same are well known to people skilled in the art, and thus no further description is provided hereinafter. - Next, with reference to
FIG. 3B , the metalhard mask layer 310 is patterned to form a patterned metalhard mask layer 310 a having a trench opening. The patterned metalhard mask layer 310 a exposes a region for forming an opening in a subsequent process. After that, a dielectrichard mask layer 312 is formed conformally over the patterned metalhard mask layer 310 a and filled in the trench opening. The material of the dielectrichard mask layer 312 is, for example, silicon oxide, and a method of forming the dielectrichard mask layer 312 includes performing the CVD process, for example. In the present embodiment, the material of the dielectrichard mask layer 312 is, for example, silicon oxide using TEOS as a gas source. However, in other embodiments, it is certain that the material of the dielectrichard mask layer 312 may be silicon carbide (SiC), SiCN or other appropriate dielectric materials. - After that, with reference to
FIG. 3C , another etching process is then carried out with use of the patterned metalhard mask layer 310 a as the mask to form anopening 313 in thedielectric layer 306. Here, theopening 313 exposes a portion of thecap layer 304 above theconductive region 302. Next, thecap layer 304 exposed by theopening 312 is removed to expose a portion of theconductive region 302. - Then, referring to
FIG. 3D , aconductive layer 314 is formed in theopening 313, such that theconductive layer 314 can be electrically connected to theconductive region 302, and thereby the single damascene process is completed. - It will be apparent to those skilled in the art that various modifications and variations can be made to the structure of the present invention without departing from the scope or spirit of the invention. In view of the foregoing, it is intended that the present invention cover modifications and variations of this invention provided they fall within the scope of the following claims and their equivalents.
Claims (11)
1. An interconnection process, comprising:
providing a substrate having a conductive region;
forming a dielectric layer on the substrate;
forming a patterned metal hard mask layer having a trench opening on the dielectric layer;
conformally forming a dielectric hard mask layer on the patterned metal hard mask layer and filled in the trench opening;
defining a photoresist pattern to remove a portion of the dielectric hard mask layer and a portion of the dielectric layer in the trench opening to form a first opening in the dielectric layer;
removing the photoresist pattern;
performing a first etching process with use of the patterned metal hard mask layer as a mask to form a trench and a second opening extending downward from the first opening in the dielectric layer in the range of the trench opening of the patterned metal hard mask layer, wherein the second opening exposes the conductive region; and
forming a conductive layer in the trench and in the second opening.
2. The interconnection process of claim 1 , wherein the material of the dielectric hard mask layer comprises silicon oxide.
3. The interconnection process of claim 1 , wherein the material of the patterned metal hard mask layer comprises titanium nitride (TiN), tantalum nitride (TaN) or a titanium-tungsten alloy.
4. The interconnection process of claim 1 , wherein the conductive region comprises a conductive wire or an electrode.
5. The interconnection process of claim 1 , wherein the material of the dielectric layer comprises the dielectric material with low dielectric constant.
6. The interconnection process of claim 1 , wherein the material of the conductive layer comprises copper or tungsten.
7. The interconnection process of claim 1 , wherein a method of forming the first opening comprises:
forming a patterned photoresist layer on the dielectric hard mask layer,
performing a second etching process with use of the patterned photoresist layer as a mask to remove a portion of the dielectric hard mask layer and a portion of the dielectric layer; and
removing the patterned photoresist layer.
8. The interconnection process of claim 1 , wherein a cap layer is further formed on the substrate before the step of forming the dielectric layer.
9. The interconnection process of claim 1 , wherein a polishing stop layer or a glue layer is further formed on the dielectric layer after the dielectric layer is formed and before the patterned metal hard mask layer is formed.
10. The interconnection process of claim 1 , wherein a method of forming the conductive layer comprises:
forming a conductive material layer over the substrate; and
performing a planarization process to remove the conductive material layer outside the trench and the second opening.
11-21. (canceled)
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US11/778,844 US20090023283A1 (en) | 2007-07-17 | 2007-07-17 | Interconnection process |
US12/179,838 US7704870B2 (en) | 2007-07-17 | 2008-07-25 | Via-first interconnection process using gap-fill during trench formation |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US11/778,844 US20090023283A1 (en) | 2007-07-17 | 2007-07-17 | Interconnection process |
Related Child Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US12/179,838 Division US7704870B2 (en) | 2007-07-17 | 2008-07-25 | Via-first interconnection process using gap-fill during trench formation |
Publications (1)
Publication Number | Publication Date |
---|---|
US20090023283A1 true US20090023283A1 (en) | 2009-01-22 |
Family
ID=40265178
Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US11/778,844 Abandoned US20090023283A1 (en) | 2007-07-17 | 2007-07-17 | Interconnection process |
US12/179,838 Active US7704870B2 (en) | 2007-07-17 | 2008-07-25 | Via-first interconnection process using gap-fill during trench formation |
Family Applications After (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US12/179,838 Active US7704870B2 (en) | 2007-07-17 | 2008-07-25 | Via-first interconnection process using gap-fill during trench formation |
Country Status (1)
Country | Link |
---|---|
US (2) | US20090023283A1 (en) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US8796150B2 (en) | 2011-01-24 | 2014-08-05 | International Business Machines Corporation | Bilayer trench first hardmask structure and process for reduced defectivity |
US9396990B2 (en) * | 2013-01-31 | 2016-07-19 | Taiwan Semiconductor Manufacturing Co., Ltd. | Capping layer for improved deposition selectivity |
Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6110826A (en) * | 1998-06-08 | 2000-08-29 | Industrial Technology Research Institute | Dual damascene process using selective W CVD |
US6265307B1 (en) * | 2000-01-12 | 2001-07-24 | Taiwan Semiconductor Manufacturing, Co., Ltd. | Fabrication method for a dual damascene structure |
US20030096496A1 (en) * | 2001-11-20 | 2003-05-22 | I-Hsiung Huang | Method of forming dual damascene structure |
US20040219796A1 (en) * | 2003-05-01 | 2004-11-04 | Chih-Ning Wu | Plasma etching process |
US20050110152A1 (en) * | 2002-01-10 | 2005-05-26 | United Microelectronics Corp | Method for forming openings in low dielectric constant material layer |
US20060286794A1 (en) * | 2005-06-15 | 2006-12-21 | Chin-Hsiang Lin | Stacked structure for forming damascene structure, method of fabricating the stacked structure, and damascene process |
US20080020565A1 (en) * | 2006-01-13 | 2008-01-24 | Semiconductor Manufacturing International (Shanghai) Corporation | Dual Damascene Copper Process Using a Selected Mask |
US20080171434A1 (en) * | 2007-01-16 | 2008-07-17 | United Microelectronics Corp. | Method of fabricating dual damascene structure |
Family Cites Families (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7348281B2 (en) * | 2003-09-19 | 2008-03-25 | Brewer Science Inc. | Method of filling structures for forming via-first dual damascene interconnects |
-
2007
- 2007-07-17 US US11/778,844 patent/US20090023283A1/en not_active Abandoned
-
2008
- 2008-07-25 US US12/179,838 patent/US7704870B2/en active Active
Patent Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6110826A (en) * | 1998-06-08 | 2000-08-29 | Industrial Technology Research Institute | Dual damascene process using selective W CVD |
US6265307B1 (en) * | 2000-01-12 | 2001-07-24 | Taiwan Semiconductor Manufacturing, Co., Ltd. | Fabrication method for a dual damascene structure |
US20030096496A1 (en) * | 2001-11-20 | 2003-05-22 | I-Hsiung Huang | Method of forming dual damascene structure |
US20050110152A1 (en) * | 2002-01-10 | 2005-05-26 | United Microelectronics Corp | Method for forming openings in low dielectric constant material layer |
US20040219796A1 (en) * | 2003-05-01 | 2004-11-04 | Chih-Ning Wu | Plasma etching process |
US20060286794A1 (en) * | 2005-06-15 | 2006-12-21 | Chin-Hsiang Lin | Stacked structure for forming damascene structure, method of fabricating the stacked structure, and damascene process |
US20080020565A1 (en) * | 2006-01-13 | 2008-01-24 | Semiconductor Manufacturing International (Shanghai) Corporation | Dual Damascene Copper Process Using a Selected Mask |
US20080171434A1 (en) * | 2007-01-16 | 2008-07-17 | United Microelectronics Corp. | Method of fabricating dual damascene structure |
Also Published As
Publication number | Publication date |
---|---|
US20090023287A1 (en) | 2009-01-22 |
US7704870B2 (en) | 2010-04-27 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US10043754B2 (en) | Semiconductor device having air gap structures and method of fabricating thereof | |
US11232979B2 (en) | Method of forming trenches | |
US11854962B2 (en) | Via structure and methods thereof | |
US10854507B2 (en) | Method of forming trenches | |
US6696222B2 (en) | Dual damascene process using metal hard mask | |
CN107230660B (en) | Method for manufacturing semiconductor device | |
US10361115B2 (en) | Reducing contact resistance in vias for copper interconnects | |
US6495448B1 (en) | Dual damascene process | |
TW201729386A (en) | Interconnection | |
US20070249165A1 (en) | Dual damascene process | |
US8647991B1 (en) | Method for forming dual damascene opening | |
US10923423B2 (en) | Interconnect structure for semiconductor devices | |
US8735301B2 (en) | Method for manufacturing semiconductor integrated circuit | |
US7704870B2 (en) | Via-first interconnection process using gap-fill during trench formation | |
CN101359619B (en) | Interconnecting process | |
US7276439B2 (en) | Method for forming contact hole for dual damascene interconnection in semiconductor device | |
US6352919B1 (en) | Method of fabricating a borderless via | |
US20230099965A1 (en) | Airgap isolation for back-end-of-the-line semiconductor interconnect structure with top via | |
TW202244995A (en) | Method for manufacturing semiconductor device | |
CN115472556A (en) | Method for forming interconnection structure |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
AS | Assignment |
Owner name: UNITED MICROELECTRONICS CORP., TAIWAN Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:MA, HONG;BAI, SHI-JIE;REEL/FRAME:019574/0489 Effective date: 20070701 |
|
STCB | Information on status: application discontinuation |
Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION |