摘要:
A method of fabricating a semiconductor device includes forming an active pattern protruding from a substrate, forming a liner layer on the active pattern, forming a sacrificial gate pattern on the liner layer and crossing the active pattern, forming source/drain regions on the active pattern and at both sides of the sacrificial gate pattern, forming an interlayer insulating layer to cover the source/drain regions, forming capping insulating patterns on the interlayer insulating layer to expose the sacrificial gate pattern, and removing the sacrificial gate pattern and the liner layer by an etching process using the capping insulating patterns as an etch mask to form a gap region exposing the active pattern. The active pattern includes a material having a lattice constant greater than a lattice constant of the substrate, and the capping insulating patterns include a material having an etch selectivity with respect to the liner layer.
摘要:
A method of fabricating a semiconductor device includes forming an active pattern protruding from a substrate, forming a liner layer on the active pattern, forming a sacrificial gate pattern on the liner layer and crossing the active pattern, forming source/drain regions on the active pattern and at both sides of the sacrificial gate pattern, forming an interlayer insulating layer to cover the source/drain regions, forming capping insulating patterns on the interlayer insulating layer to expose the sacrificial gate pattern, and removing the sacrificial gate pattern and the liner layer by an etching process using the capping insulating patterns as an etch mask to form a gap region exposing the active pattern. The active pattern includes a material having a lattice constant greater than a lattice constant of the substrate, and the capping insulating patterns include a material having an etch selectivity with respect to the liner layer.
摘要:
A semiconductor device includes a substrate, an insulating layer disposed on the substrate and having a trench exposing a surface portion of the substrate, and a channel-forming structure comprising crystalline semiconductor material. The channel-forming structure has a lower portion located in the trench and fins extending upright on the lower portion, where the fins are spaced from each other and are each narrower than an opening of the trench, and the lower portion of the channel forming structure has a higher crystal defect density than the fins of the channel forming structure.
摘要:
A method of manufacturing a transistor of a semiconductor device, the method including forming a gate pattern on a semiconductor substrate, forming a spacer on a sidewall of the gate pattern, wet etching the semiconductor substrate to form a first recess in the semiconductor substrate, wherein the first recess is adjacent to the spacer, and wet etching the first recess to form a second recess in the semiconductor substrate.
摘要:
Provided is a method for removing noise of a positron emission tomography (PET) signal in a PET-magnetic resonance imaging (MRI) fusion device without using an MRI radio frequency (RF) shield that degrades image quality. The method includes: (a1) converting a PET analog signal into a digital signal having a predetermined sampling frequency; (b1) determining whether the resulting PET digital signal is to be included in image reconstruction based on modeling using sampling points of the PET digital signal or an integration value of the PET digital signal; and (c1) extracting only the PET digital signal that will be included in image reconstruction. The method allows acquisition of molecular-level images without declined performance of a PET detector.
摘要:
Provided is a method for removing noise of a positron emission tomography (PET) signal in a PET-magnetic resonance imaging (MRI) fusion device without using an MRI radio frequency (RF) shield that degrades image quality. The method includes: receiving a PET output signal from a PET-MRI fusion device and performing analog filtering by removing noise components due to an RF pulse frequency based on the relationship between the frequency of the PET output signal and a magnetic resonance (MR) RF frequency (Larmor frequency); and converting the filtered signal into a digital signal through sampling. The method allows acquisition of molecular-level images without declined performance of a PET detector in MRI environment.
摘要:
A semiconductor device includes a substrate having a first region and a second region, a first MOS transistor including a first fin structure and a first gate electrode in the first region, the first fin structure having a first buffer pattern, a second buffer pattern, and a first channel pattern which are sequentially stacked on the substrate, and a second MOS transistor including a second fin structure and a second gate electrode in the second region, the second fin structure having a third buffer pattern and a second channel pattern which are sequentially stacked on the substrate. Related fabrication methods are also discussed.
摘要:
Provided is a positron emission tomography (PET) detector module using Geiger-mode avalanche photodiode (GAPD) as a photosensor. The PET detector module includes: a PET detector unit with a scintillation crystal detecting gamma rays emitted from a living body and converting them into a scintillation light and a first GAPD photosensor and a second GAPD photosensor each being connected to either end of the scintillation crystal and converting the scintillation light into an electrical signal; and a depth of interaction (DOI) decoding unit receiving the signals from the PET detector unit and comparing amplitude of the signals detected by the first GAPD photosensor and the second GAPD photosensor, thereby providing the depth information where the gamma rays are incident on the scintillation crystal (DOI). The disclosed PET detector module can provide improved energy resolution and additional DOI information while maintaining linearity.
摘要:
A semiconductor device includes an active pattern provided on a substrate and a gate electrode crossing over the active pattern. The active pattern includes a first buffer pattern on the substrate, a channel pattern on the first buffer pattern, a doped pattern between the first buffer pattern and the channel pattern, and a second buffer pattern between the doped pattern and the channel pattern. The doped pattern includes graphene injected with an impurity.
摘要:
A method of manufacturing a transistor of a semiconductor device, the method including forming a gate pattern on a semiconductor substrate, forming a spacer on a sidewall of the gate pattern, wet etching the semiconductor substrate to form a first recess in the semiconductor substrate, wherein the first recess is adjacent to the spacer, and wet etching the first recess to form a second recess in the semiconductor substrate.