摘要:
A metal processing method is provided for growing a polycrystalline film by preferably chemical vapor deposition (CVD) from a suitable precursor gas or gases on a substrate which has been coated with seeds, preferably of nanocrystal size, of the metal material. The nanocrystal seeds serve as a template for the structure of the final polycrystalline film. The density of the seeds and the thickness of the grown polycrystalline film determine the grain size of the polycrystalline film at the surface of said film. CVD onto the seeds to produce the polycrystalline film avoids the recrystallization step generally necessary for the formation of a polycrystalline film, and thus allows for the growth of polycrystalline films at reduced temperatures.
摘要:
A process for moderating the thermal energy content of a body with a container enclosing a phase change material (PCM) is detailed. The phase change material comprises a high molecular weight dibasic organic acid and mixtures thereof. Miscible aliphatic and aryl monobasic acids are also suitable as PCM constituents. The PCM is capable of absorbing thermal energy from a variety of bodies including air, heat transfer fluids, combustion reactions, radiation sources and the like. In the course of absorbing thermal energy the PCM undergoes a reversible melt. Upon the PCM being exposed to a temperature below its melting temperature, the PCM releases the stored latent heat of fusion energy absorbed upon melting and undergoes a reversible freeze.
摘要:
A field hydrogen generation system. Includes a flexible housing transparent to visible light and a photoelectrochemical cell adapted to be received within a volume of the housing. A quantity of feedstock liquid within the housing is in contact with said photoelectrochemical cell. A conduit is in fluid communication between the volume of the housing and a hydrogen collection vessel.
摘要:
A family of organic compounds with chemical properties that make them suitable for use as phase change materials (PCMs), comprising, esters of dibasic acids are disclosed. These materials have high latent heats of fusion, low flammability, low miscibility with water, low cost, availability and a range of melting temperatures. The PCMs of the invention may be enclosed in a single, non-compartmentalized container with immiscible phase change material substances to moderate the temperature of a body between that of the melting temperatures of the PCMs.
摘要:
The formation of microelectronic structures in trenches and vias of an integrated circuit wafer are described using nanocrystal solutions. A nanocrystal solution is applied to flood the wafer surface. The solvent penetrates the trench recesses within the wafer surface. In the process, nanocrystals dissolved or suspended in the solution are carried into these regions. The solvent volatilizes more quickly from the wafer plateaus as compared to the recesses causing the nanocrystals to become concentrated in the shrinking solvent pools within the recesses. The nanocrystals become stranded in the dry trenches. Heating the wafer to a temperature sufficient to sinter or melt the nanocrystals results in the formation of bulk polycrystalline domains. Heating is also carried out concurrently with nanocrystals solution deposition. Copper nanocrystals of less than about 5 nanometers are particularly well suited for formation of interconnects at temperatures of less than 350 degrees Celsius.
摘要:
A process for reacting a molecule using light as an energy source is described which comprises exposing the molecule to a catalyst material, the catalyst material in contact with an illuminated, quantum confined Group IV semiconductor domain of silicon or germanium. The Group IV semiconductor domain having a band gap greater than bulk silicon and sufficiently large for reacting the molecule. The process is particularly useful in decomposing water into hydrogen and oxygen, as well as photocatalytically degrading pollutants in a waste stream. A device based on a Group IV semiconductor nanoparticles for conducting photo electrochemistry is also disclosed.
摘要:
The formation of microelectronic structures in trenches and vias of an integrated circuit wafer are described using nanocrystal solutions. A nanocrystal solution is applied to flood the wafer surface. The solvent penetrates the trench recesses within the wafer surface. In the process, nanocrystals dissolved or suspended in the solution are carried into these regions. The solvent volatilizes more quickly from the wafer plateaus as compared to the recesses causing the nanocrystals to become concentrated in the shrinking solvent pools within the recesses. The nanocrystals become stranded in the dry trenches. Heating the wafer to a temperature sufficient to sinter or melt the nanocrystals results in the formation of bulk polycrystalline domains. Heating is also carried out concurrently with nanocrystals solution deposition. Copper nanocrystals of less than about 5 nanometers are particularly well suited for formation of interconnects at temperatures of less than 350 degrees Celcius.
摘要:
A high resolution exposure mask suitable for x-ray lithography is described in the present invention and a method of manufacturing the same. Nanocrystals of electron dense materials, preferably as a colloidal solution are applied to a surface of a low electron density substrate, so as to form features as fine as about 10 nanometers. The reduced melting and sintering temperatures associated with nanocrystals, compared with the bulk material allows for the use of more moderate processing conditions. Lessened interfacial stress between dissimilar layers results.
摘要:
Thin films of the Group IV materials silicon and germanium are produced in the range of 2.5 to 25 nm thick from nanocrystal precursors. According to the invention a solid, continuous film of silicon or germanium is formed by depositing a contiguous layer of nanocrystals of the semi-conductor materials onto a substrate, then heating the layer to a temperature below the bulk melting temperature which is nonetheless adequate to melt the nanocrystals and form a continuous liquid thin film upon cooling. The resulting thin film may be doped or intrinsic. The lower processing temperatures make it possible to form these thin semi-conductor films with less stringent thermal requirements on the underlayers, substrates and other related structures, thus supporting applications in microelectronics, solar conversion and so forth.
摘要:
A continuous semiconductor thin film is formed by providing a sheet of a substrate material and applying a continuous layer of nanocrystals of the semiconductor material onto the substrate. The layer of nanocrystals is melted at a temperature below that of the bulk, but which is nonetheless adequate to melt the nanocrystals and cause them to fuse into a continuous thin film which forms a solid upon cooling. The nanocrystals may be sprayed onto the substrate, either from the liquid or gas phase. The substrate sheet is preferably tensioned during the application of the nanocrystalline layer, for example, with a set of rollers is used to provide the tensioning at a predetermined feed rate.