Abstract:
비정질 산화물 반도체 박막 트랜지스터의 커패시턴스 모델링 방법 및 그 장치가 개시된다. 본 발명의 일 실시예에 따른 비정질 산화물 반도체 박막 트랜지스터의 커패시턴스 모델링 방법은 밴드갭 내 상태밀도(subgap DOS)에 속박되어 있는 전하밀도를 계산하는 단계; 게이트 전압의 기 설정된 범위에 따라 채널 내에 존재하는 전하밀도를 주요(dominant) 캐리어 성분으로 근사화하는 단계; 상기 근사화된 상기 전하밀도에 기초하여 단위면적당 총 전하를 계산하는 단계; 및 상기 밴드갭 내 상태밀도, 상기 계산된 상기 단위면적당 총 전하 및 기 입력된 복수의 파라미터들에 대한 정보에 기초하여 커패시턴스 모델을 생성하는 단계를 포함함으로써, 비정질 산화물 반도체 TFT 기반의 해석적인 커패시턴스 모델을 제공하고, 이를 통해 커패시턴스 계산 속도를 향상시켜 시뮬레이션 모델로 적용할 수 있다.
Abstract:
PURPOSE: A capacitance modeling method of an amorphous oxide semiconductor TFT and an apparatus thereof are provided to improve the calculating speed of the capacitance by indicating a capacitance model as an analytical formula. CONSTITUTION: An input unit(1010) receives information about a parameter. An approximating unit(1030) approximates electric charge density as a main carrier component according to the setting range of a gate voltage. A calculation unit(1020) calculates total charge by unit surface based on the approximated charge density. A capacitance model generator(1040) generates a capacitance model based on parameter information. [Reference numerals] (1010) Input unit; (1020) Calculation unit; (1030) Approximating unit; (1040) Capacitance model generator
Abstract:
PURPOSE: A current modeling method and apparatus of an amorphous oxide semiconductor thin film transistor are provided to improve a current calculation speed by supplying an analytical current model. CONSTITUTION: Charge density which is restricted in state density within a band gap is calculated(S310). The charge density is approximated to a major carrier component in case voltage between gate-sources is less than threshold voltage and is over than the threshold voltage(S320). Total electric charge per unit area is calculated(S330). The mobility of a channel which depends on gate voltage is calculated(S340). A first current model and a second current model are created(S350). A total current model is created using the first current model and the second current model(S360).
Abstract:
PURPOSE: A method for manufacturing an SB DRAM cell transistor without a capacitor is provided to reduce a defect caused by inconsistency in gratings by alternately performing heterogeneous bonding of a silicon layer and a silicon germanium layer via a molecular beam epitaxy growth. CONSTITUTION: A wafer is etched by using a Damascene process(S200). The poly-crystal silicon is evaporated and a lower gate is formed(S300). A polycrystalline silicon layer is flattened through the chemical mechanical polishing process(S400). The silicon dioxide is evaporated, the silicon dioxide wall is made and the silicon dioxide wall is etched for channel forming(S500). The silicon channel layer crystallized between the silicon dioxide walls is evaporated and engraved through the chemical mechanical polishing(S600). The silicon channel layer is etched in order to make the rule grating(S700).
Abstract:
Disclosed are a method of extracting the surface potential and state density within a band-gap of an amorphous semiconductor thin film transistor using a coupling factor, and a device thereof. The method for extracting the surface potential of the amorphous semiconductor thin film transistor according to an embodiment of the present invention comprises a step of measuring a drain current by a gate voltage of the thin film transistor; a step of extracting a drain current lower than a threshold voltage between the measured drain currents; and a step of extracting the surface potential by the gate voltage of the thin film transistor based on the differentiation of the drain current extracted. The step of extracting the surface potential extracts the surface potential by the gate voltage in the light of a coupling factor included in the surface potential and the extracted drain currents.
Abstract:
Disclosed is a method for extracting state density in a band gap of an amorphous oxide semiconductor thin film transistor and a device for the same. The method for extracting state density in a band gap of an amorphous oxide semiconductor thin film transistor according to an embodiment of the present invention includes a step of measuring a drain current according to a gate voltage of the thin film transistor; a step of calculating an ideality factor according to the gate voltage by using the measured drain current; a step of differentiating the calculated ideality factor and obtaining a capacitance within a channel based on the differentiated ideality factor; and a step of extracting the state density within the band gap of the thin film transistor based on the obtained capacitance within the cannel. The step of calculating the ideality factor comprises: calculating the ideality factor based on the drain current which is less than or equal to a threshold voltage among the measured drain current so that the state density in the band gap can be extracted without a complex modification. The ideality factor is differentiated so that the accurate state density in the band gap, which is independent to the threshold voltage and is not influenced from heat, light, or temperature, can be extracted. [Reference numerals] (AA) START; (BB) END; (S310) Measuring drain current according to gate voltage; (S320) Calculating an ideal coefficient according to the gate voltage by using the measured drain current; (S330) Differentiating the calculated ideal coefficient; (S340) Obtaining capacitance in a channel based on the differentiated ideal coefficient; (S350) Extracting status density in a band gap based on the capacitance in the obtained channel
Abstract:
A method for extracting the density of state within an intrinsic band gap of an amorphous oxide semiconductor thin film transistor and a device thereof are disclosed. The method for extracting the density of state within the intrinsic band gap of the amorphous oxide semiconductor thin film transistor according to the present invention comprises; a step of measuring darkroom capacitance according to gate voltage of a thin film transistor; a step of measuring light reaction capacitance of the thin film transistor by irradiating the thin film transistor with a light source of a predetermined wavelength; a step of applying a first capacitance model and a second capacitance model to an area under flat-band voltage of the thin film transistor and an area over the flat-band voltage of the thin film transistor; and a step of extracting the density of state of an acceptor within the band gap and the density of state of a donor within the band gap based on the darkroom capacitance, the light reaction capacitance, and the applied first and second capacitance models. The present invention extracts the whole density of state within the band gap using experimental measurement data and rapidly simply extracts the whole density of state within the band gap by omitting a repetitive process and a complex calculation. [Reference numerals] (AA) START;(BB) END;(S210) Darkroom capacitance according to gate voltage is measured in a darkroom;(S220) Light reaction capacitance according to gate voltage is measured by irradiating a light source;(S230) Different capacitance model is applied to an area under or over flat voltage (V_FB);(S240) Density of state of a donor within a band gap and the density of state of anacceptor within the band gap are separately extracted based on measured darkroom capacitance, light reaction capacitance, and a capacitance model
Abstract:
PURPOSE: An amorphous semiconductor thin film transistor with an active layer doped with different concentrations and a manufacturing method thereof are provided to improve stability by making the doping concentration of a semiconductor layer different. CONSTITUTION: A gate is formed on a substrate. A gate insulating layer is formed on the gate. Semiconductor layers doped with different concentrations are laminated to form an active layer(140). A source(150) is in contact with the active layer. A drain(160) is in contact with the active layer.