8 results about "Equivalent oxide thickness" patented technology

The invention provides a semiconductor structure and a preparation method thereof, a memory device and electronic equipment. The preparation method of the semiconductor structure comprises the following steps: providing a substrate; a plurality of semiconductor columns distributed in an array mode and first insulation structures located between the semiconductor columns are manufactured on one side of the substrate, the semiconductor columns extend in the direction perpendicular to the plane of the semiconductor column array, the first insulation structures are provided with first grooves, and channel regions of the semiconductor columns are exposed out of the first grooves; a superlattice film with ferroelectric materials and anti-ferroelectric materials alternating in sequence is manufactured in the first groove, a plurality of gate dielectric layers corresponding to the semiconductor columns in a one-to-one mode are formed, and each gate dielectric layer surrounds at least part of the periphery of a channel region of the corresponding semiconductor column; and manufacturing a grid electrode outside the grid electrode dielectric layer so as to form a plurality of transistors distributed in an array. According to the invention, low electric leakage is maintained while the equivalent oxide thickness is reduced.

The invention provides a gate oxide annealing method for reducing a gate oxide interface state. The method aims at solving the problem that the interface state density of a thin silicon oxynitride gate medium is high. The method comprises the following steps: carrying out first annealing treatment on a nitrided gate oxide layer in a nitrogen atmosphere; and after the first annealing treatment, re-oxidation treatment is carried out on the gate oxide layer in situ in a pure oxygen atmosphere. Through the in-situ re-oxidation treatment, a high-quality silicon dioxide thin layer is formed at the interface of the gate oxide layer and the silicon substrate, so that the dangling bond of the interface is effectively repaired, and the nitrogen concentration at the interface is reduced. According to the invention, the interface state density and gate oxide electric leakage can be significantly reduced, the equivalent oxide thickness is maintained basically unchanged, and the electrical performance and reliability of the semiconductor device are effectively improved.

The present invention provides a capacitor having a double electrode layer in which the thickness of the double electrode layer per one super cycle can be finely adjusted to be 1 nm to 2 nm by a tin doped molybdenum oxide (TMO) process having one super cycle of an atomic layer deposition process including a Mo deposition sub-cycle for forming a Mo oxide layer and a Sn oxide doping sub-cycle for doping the Sn oxide, thereby reducing an equivalent oxide thickness and a leakage current and increasing a dielectric constant.

The invention provides a semiconductor structure. The semiconductor structure comprises a semiconductor layer; the source region and the drain region are located in the semiconductor layer and are arranged at intervals; the gate structure is located on the semiconductor layer and comprises a gate dielectric layer and a gate which are stacked, the gate dielectric layer comprises a first region close to the drain region and a second region close to the source region, and the equivalent oxide layer thickness of the second region is equal to that of the first region; wherein the first region comprises a first dielectric layer and a second dielectric layer which are stacked; at least part of the first dielectric layer has a first dielectric constant; the second dielectric layer has a second dielectric constant which is greater than the first dielectric constant; the second region has a first dielectric constant. According to the semiconductor structure, the dielectric layer with the high dielectric constant is inserted into the gate dielectric layer close to the drain region, so that an asymmetric gate structure is formed under the condition that an EOT value is not changed, the overhigh longitudinal electric field intensity when high voltage is applied to the drain can be reduced, and the carrier tunneling probability is reduced.

The invention provides a semiconductor structure and a forming method thereof, in the forming method of the semiconductor structure, a first gate dielectric layer is firstly formed, and the first gate dielectric layer covers substrates of a first well region and a second well region; forming a second gate dielectric layer by adopting an atomic layer deposition process, wherein the second gate dielectric layer covers the first gate dielectric layer; wherein the second gate dielectric layer is made of HfTiO. Titanium is an effective dopant, the oxide of titanium has a high k value, and the k value of HfTiO is about 30; and in addition, the HfTiO also shows good thermal stability and is relatively high in crystallization temperature. In addition, Ti and Hf are tetravalent elements, and Ti-doped HfO2 does not cause increase of oxygen vacancies, so that increase of leakage current in the film is avoided. Therefore, by using the Ti-doped hafnium oxide film as the gate oxide dielectric layer, the k value is improved, so that the lower equivalent oxide thickness is obtained under the same thickness, the gate leakage current is reduced, and the device performance is improved.

The invention discloses an asymmetric double-gate two-dimensional semiconductor field effect transistor and a preparation method thereof. The transistor comprises a substrate, a bottom gate dielectric layer is stacked on the substrate, a channel layer is arranged in the center of the bottom gate dielectric layer, a drain electrode and a source electrode are arranged at the two ends of the top of the channel layer respectively, and the drain electrode and the source electrode extend to the bottom gate dielectric layer; a top gate dielectric layer is arranged in the center of the top of the channel layer, a top gate electrode is arranged on the top gate dielectric layer, a bottom gate electrode is arranged at the bottom of the substrate, and the equivalent oxide layer thickness ratio of the bottom gate dielectric layer to the top gate dielectric layer is at least larger than 25 times; according to the invention, the asymmetric double-gate dielectric structure is constructed, so that the gate control capability of the double-gate two-dimensional semiconductor field effect transistor is improved, the regulation and control range of the threshold voltage is increased, and the excellent switching characteristic of the two-dimensional semiconductor field effect transistor is ensured.

The invention provides an MOSFET device simulation model calculation method, computer equipment and a storage medium. The MOSFET device simulation model calculation method comprises the steps that value transmission of internal parameter variables of a simulation model is conducted according to external input parameters; variable abnormity check is carried out during scaling, the thickness of an equivalent oxide layer of an electrical grid is updated, and then fringing field capacitance calculation is carried out; range checking is carried out on the scaled model internal parameter variables, and associated variable anomaly checking is carried out; a body bias coefficient of a non-uniform depletion width effect is introduced to carry out model calculation on model internal parameter variables which do not exceed the range, and current, charge, conductance and capacitance of each node are obtained; and performing element value filling of a model matrix according to a model calculation result, and introducing multiplication parameters to respectively multiply current, charge and FN noise. According to the scheme, the correctness and precision of the MOSFET device model can be further improved, so that the reliability of a simulation result can be better ensured when the whole circuit is simulated.

In a method for obtaining the equivalent oxide thickness of a dielectric layer, a first semiconductor capacitor including a first silicon dioxide layer and a second semiconductor capacitor including a second silicon dioxide layer are provided and a modulation voltage is applied to the semiconductor capacitors to measure a first scanning capacitance microscopic signal and a second scanning capacitance microscopic signal. According to the equivalent oxide thicknesses of the silicon dioxide layers and the scanning capacitance microscopic signals, an impedance ratio is calculated. The modulation voltage is applied to a third semiconductor capacitor including a dielectric layer to measure a third scanning capacitance microscopic signal. Finally, the equivalent oxide thickness of the dielectric layer is obtained according to the equivalent oxide thickness of the first silicon dioxide layer, the first scanning capacitance microscopic signal, third scanning capacitance microscopic signal, and the impedance ratio.