Taiwan Semiconductor Manufacturing Comp. Ltd.

Wei-Yip Loh

Hung-Hsu Chen

Chih-Wei Chang

Yan-Ming Tsai

Ming-Hsing Tsai

Sheng-Hsuan Lin

Hong-Mao Lee

Yu-Kai Chen

Yu-Wen Cheng

Wei-Jung Lin

Li-Wei Chu

Chih-wei Chang

Ching-Yi Chen

Ying-Chi Su

Yu-Shiuan Wang

Ken-Yu Chang

Hung-Yi Huang

Yu-Ming Huang

Cheng-Tung Lin

Chun-I Tsai

Ya-Yi Cheng

Harry Chien

Yi-Ning Tai

Yee-Chia Yeo

Huicheng Chang

Lin-Yu Huang

Liang-Yin Chen

Sung-Li Wang

Chun-Hsien Huang

Su-Hao Liu

Shuen-Shin Liang

Chia-Hung Chu

Po-Chin Chang

Meng-Han Chou

Pinyen Lin

Kan-Ju Lin

Yu-Hsiang Liao

Kuan-Yu Yeh

Tzu-Pei Chen

Raghunath Putikam

Hsu-Kai Chang

Chien Chang

Kuan-Kan Hu

Yuting Cheng

Min-Hsuan Lu

Chih-Shiun Chou

Chuan-Hui Shen

Tai Min Chang

Semiconductor structures and methods of forming the same are provided. A method of the present disclosure includes receiving a workpiece that includes a bottom source/drain feature over a substrate, a first dielectric layer over the bottom source/drain feature, a top source/drain feature over the first dielectric layer, and a second dielectric layer over the top source/drain feature, forming a frontside opening through the second dielectric layer to expose a portion of the top source/drain feature, selectively depositing a first silicide layer on the exposed portion of the top source/drain feature, forming a top metal fill layer over the first silicide layer to fill the frontside opening, forming a backside opening through the substrate to expose a portion of the bottom source/drain feature, selectively depositing a second silicide layer on the exposed portion of the bottom source/drain feature, and forming a bottom metal fill layer on the second silicide layer.

Selective silicide for stacked multi-gate device

A semiconductor structure and method of forming a semiconductor structure are provided. In some embodiments, the method includes forming a gate structure over a substrate. An epitaxial source/drain region is formed adjacent to the gate structure. A dielectric layer is formed over the epitaxial source/drain region. An opening is formed, the opening extending through the dielectric layer and exposing the epitaxial source/drain region. Sidewalls of the opening are defined by the dielectric layer and a bottom of the opening is defined by the epitaxial source/drain region. A silicide layer is formed on the epitaxial source/drain region. A metal capping layer including tungsten, molybdenum, or a combination thereof is selectively formed on the silicide layer by a first deposition process. The opening is filled with a first conductive material in a bottom-up manner from the metal capping layer by a second deposition process different from the first deposition process.

Semiconductor device structure and method for forming the same

A semiconductor device includes a semiconductor substrate, an epitaxial structure, a silicide structure, a conductive structure, and a protection segment. The epitaxial structure is disposed in the semiconductor substrate. The silicide structure is disposed in the epitaxial structure. The conductive structure is disposed over the silicide structure and is electrically connected to the silicide structure. The protection segment is made of metal nitride, is disposed over the silicide structure, and is disposed between the silicide structure and the conductive structure.

Semiconductor device with conductive liners over silicide structures and method of making the semiconductor device

Embodiments disclosed herein relate generally to forming an effective metal diffusion barrier in sidewalls of epitaxy source/drain regions. In an embodiment, a structure includes an active area having a source/drain region on a substrate, a dielectric layer over the active area and having a sidewall aligned with the sidewall of the source/drain region, and a conductive feature along the sidewall of the dielectric layer to the source/drain region. The source/drain region has a sidewall and a lateral surface extending laterally from the sidewall of the source/drain region, and the source/drain region further includes a nitrided region extending laterally from the sidewall of the source/drain region into the source/drain region. The conductive feature includes a silicide region along the lateral surface of the source/drain region and along at least a portion of the sidewall of the source/drain region.

Contact with a silicide region

A method for manufacturing a semiconductor device includes: forming a lower metal contact in a trench of a first dielectric structure, the lower metal contact having a height less than a depth of the trench and being made of a first metal material; forming an upper metal contact to fill the trench and to be in contact with the lower metal contact, the upper metal contact being formed of a second metal material different from the first metal material and having a bottom surface with a dimension the same as a dimension of a top surface of the lower metal contact; forming a second dielectric structure on the first dielectric structure; and forming a via contact penetrating through the second dielectric structure to be electrically connected to the upper metal contact, the via contact being formed of a metal material the same as the second metal material.

Gate to source drain interconnects

An ammonium fluoride gas may be used to form a protection layer for one or more interlayer dielectric layers, one or more insulating caps, and/or one or more source/drain regions of a semiconductor device during a pre-clean etch process. The protection layer can be formed through an oversupply of nitrogen trifluoride during the pre-clean etch process. The oversupply of nitrogen trifluoride causes an increased formation of ammonium fluoride, which coats the interlayer dielectric layer(s), the insulating cap(s), and/or the source/drain region(s) with a thick protection layer. The protection layer protects the interlayer dielectric layer(s), the insulating cap(s), and/or the source/drain region(s) during the pre-clean process from being etched by fluorine ions formed during the pre-clean process.

Ammonium fluoride pre-clean protection

The present disclosure provides a method to enlarge the process window for forming a source/drain contact. The method may include receiving a workpiece that includes a source/drain feature exposed in a source/drain opening defined between two gate structures, conformally depositing a dielectric layer over sidewalls of the source/drain opening and a top surface of the source/drain feature, anisotropically etching the dielectric layer to expose the source/drain feature, performing an implantation process to the dielectric layer, and after the performing of the implantation process, performing a pre-clean process to the workpiece. The implantation process includes a non-zero tilt angle.

Deposition window enlargement

Semiconductor device pre-cleaning

The present disclosure describes a buried conductive structure in a semiconductor substrate and a method for forming the structure. The structure includes an epitaxial region disposed on a substrate and adjacent to a nanostructured gate layer and a nanostructured channel layer, a first silicide layer disposed within a top portion of the epitaxial region, and a first conductive structure disposed on a top surface of the first silicide layer. The structure further includes a second silicide layer disposed within a bottom portion of the epitaxial region and a second conductive structure disposed on a bottom surface of the second silicide layer and traversing through the substrate, where the second conductive structure includes a first metal layer in contact with the second silicide layer and a second metal layer in contact with the first metal layer.

Buried conductive structure in semiconductor substrate

A semiconductor device with multiple silicide regions is provided. In embodiments a first silicide precursor and a second silicide precursor are deposited on a source/drain region. A first silicide with a first phase is formed, and the second silicide precursor is insoluble within the first phase of the first silicide. The first phase of the first silicide is modified to a second phase of the first silicide, and the second silicide precursor being soluble within the second phase of the first silicide. A second silicide is formed with the second silicide precursor and the second phase of the first silicide.

Method of manufacturing semiconductor devices with multiple silicide regions

A device includes a fin extending from a semiconductor substrate, a gate stack over and along a sidewall of the fin, an isolation region surrounding the gate stack, an epitaxial source/drain region in the fin and adjacent the gate stack, and a source/drain contact extending through the isolation region, including a first silicide region in the epitaxial source/drain region, the first silicide region including NiSi, a second silicide region on the first silicide region, the second silicide region including TiSi, and a conductive material on the second silicide region.

Contact structure for semiconductor device and method

Techniques described herein enable respective (different) types of metal silicide layers to be formed for p-type source/drain regions and n-type source/drain regions in a selective manner. For example, a p-type metal silicide layer may be selectively formed over a p-type source/drain region (e.g., such that the p-type metal silicide layer is not formed over the n-type source/drain region) and an n-type metal silicide layer may be formed over the n-type source/drain region (which may be selective or non-selective). This provides a low Schottky barrier height between the p-type metal silicide layer and the p-type source/drain region, as well as a low Schottky barrier height between the n-type metal silicide layer and the n-type source/drain region. This reduces the contact resistance for both p-type source/drain regions and n-type source/drain regions.

Selective dual silicide formation

Generally, examples are provided relating to conductive features that include a barrier layer, and to methods thereof. In an embodiment, a metal layer is deposited in an opening through a dielectric layer(s) to a source/drain region. The metal layer is along the source/drain region and along a sidewall of the dielectric layer(s) that at least partially defines the opening. The metal layer is nitrided, which includes performing a multiple plasma process that includes at least one directional-dependent plasma process. A portion of the metal layer remains un-nitrided by the multiple plasma process. A silicide region is formed, which includes reacting the un-nitrided portion of the metal layer with a portion of the source/drain region. A conductive material is disposed in the opening on the nitrided portions of the metal layer.

Conductive feature formation and structure

A nitrogen plasma treatment is used on an adhesion layer of a contact plug. As a result of the nitrogen plasma treatment, nitrogen is incorporated into the adhesion layer. When a contact plug is deposited in the opening, an interlayer of a metal nitride is formed between the contact plug and the adhesion layer. A nitrogen plasma treatment is used on an opening in an insulating layer. As a result of the nitrogen plasma treatment, nitrogen is incorporated into the insulating layer at the opening. When a contact plug is deposited in the opening, an interlayer of a metal nitride is formed between the contact plug and the insulating layer.

Treatment for adhesion improvement

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Hsinchu, Taiwan

Wei-Yip Loh