An aluminum paste comprising particulate aluminum, an organic vehicle and glass frit selected from (i) lead-free glass frits with a softening point temperature in the range of 550 to 611° C. and containing 11 to 33 wt.-% of SiO 2 , >0 to 7 wt.-% of Al 2 O 3 and 2 to 10 wt.-% of B 2 O 3 and (ii) lead-containing glass frits with a softening point temperature in the range of 571 to 636° C. and containing 53 to 57 wt.-% of PbO, 25 to 29 wt.-% of SiO 2 , 2 to 6 wt.-% of Al 2 O 3 and 6 to 9 wt.-% of B 2 O 3 , useful in the production of aluminum back electrodes of PERC silicon solar cells.

Aluminum pastes and use thereof in the production of passivated emitter and rear contact silicon solar cells

The invention relates to a vibration sensor based on a surface acoustic wave radio frequency identification technology and application for the vibration sensor The vibration sensor can be used for identifying the identity of a measured object in a radio frequency manner, and can also be used for monitoring whether the vibration acceleration of the measured object exceeds a set threshold value or not and then recording the vibration acceleration of the measured object; a surface acoustic wave device comprises an antenna, a piezoelectric substrate, an interdigital transducer, reflecting gratings and an elastic element; radixes in the reflecting gratings are used for coding radio frequency tags; the 1-3 reflecting gratings are connected with the elastic element, and then a normally open loop is formed; when the vibration acceleration induced by the vibration sensor exceeds the set threshold value, the reflecting gratings, the elastic element and matched networks jointly form a closed loop; and features of echo signals reflected back to a reader are changed, so that the vibration sensor can alarm after the vibration acceleration in a superthreshold is recorded Compared with the prior art, the vibration sensor has the characteristics that a measuring method is simple, multidimensional and multi-range measurement can be realized, the vibration sensor is wide in application, and the like

Vibration sensor based on surface acoustic wave radio frequency identification technology and application for vibration sensor

The invention belongs to the technical field of nanometer aluminum paste for a solar battery, in particular to a nanometer aluminum paste for a crystalline silicon solar battery and a manufacturing method thereof. The invention provides the nanometer aluminum paste for a crystalline silicon solar battery; after the nanometer aluminum past is sintered, a silicon wafer has high photoelectric conversion efficiency, an aluminum film is uniform, and an aluminum bead is absent. The nanometer aluminum paste for the crystalline silicon solar battery is composed of 50-80 parts by weight of aluminum alloy powder, 2-10 parts by weight of inorganic adhesive, and 20-40 parts by weight of organic carrier. The nanometer aluminum paste in the invention can be widely applied to the crystalline silicon solar battery, the photoelectric conversion efficiency is 0.3% hither than the normal aluminum paste, and the silk-screen cast performance is excellent.

Nanometer aluminum paste for solar battery and manufacturing method thereof

The invention discloses a preparation method of a CsPb2Br5 nanosheet. The method comprises the following steps: adding excess oleic acid into an octadecylene solution containing Cs2CO3, heating to complete reaction of the Cs2CO3 under the protection of nitrogen to obtain a cesium oleate precursor solution; adding PbBr2 into the eighteen octadecylene solution, heating the solution to the oxygen content of 0 under the protection of nitrogen, heating again, adding oleylamine and oleic acid until complete dissolution of PbBr2, injecting the cesium oleate precursor solution, heating for 60-120 min under the condition of nitrogen, and finally reducing the reaction temperature of the reaction liquid to complete termination; and centrifuging and purifying the organic solution, and storing in organic solution. The prepared CsPb2Br5 nanosheet has homogeneous phase, good crystal structure, good uniformity, high yield, high fluorescence efficiency and stable structure, can be used in industrial production, and has potential application value in solar cells, light emitting diodes (QLED) and microlaser.

CsPb2Br5 nanosheet and preparation method thereof

The invention discloses a film bulk acoustic resonator having multiple resonance modes. The film bulk acoustic resonator sequentially comprises a silicon substrate and piezoelectric stack structures; a cavity between the piezoelectric stack structures forms a resonant cavity of the film bulk acoustic resonator; and the piezoelectric stack structure comprises a bottom electrode, more than two layers of piezoelectric films and a top electrode in sequence from bottom to top. The film bulk acoustic resonator disclosed by the invention is provided with multiple resonance points; a multi-passband filter can be designed through multiple film bulk acoustic resonators in manners of cascading, bridging and the like; and thus, the number of FBAR filters on a wireless terminal can be greatly reduced.

Film bulk acoustic resonator having multiple resonance modes and preparation method thereof and filter

The invention discloses a low-temperature co-fired ceramic substrate material and a preparation method thereof. The ceramic substrate material is zinc borate ceramic of which the main crystalline phase is 3ZnO.B2O3. The ceramic raw material consists of the components of ZnO and H3BO3, wherein the mole percent of the H3BO3 is 60-41.176%, or the raw material consists of chemical components of ZnO and B2O3, wherein the mole percent of the B2O3 is 42.857-25.926%. The preparation method of the ceramic substrate material comprises the steps of firstly presintering to combine 3ZnO.B2O3 powder, then adding deionized water, ball milling, drying, granulating, tableting and sintering. The material disclosed by the invention has a low sintering temperature (950-1000 DEG C) and good microwave dielectric performances: dielectric constant epsilon r = 6.5-6.9, Q*f = 26400-44600 GHz, and the resonant frequency temperature coefficient = -66 to -94 ppm/K, and the dielectric performance requirement of a high-frequency high-speed circuit on the substrate material can be met.

Low-temperature co-fired ceramic substrate material and preparation method thereof

The invention discloses a cesium lead bromide powder preparation method. The method concretely comprises the following steps: 1, obtaining an initial solution of a reactant lead bromide; 2, obtaining an initial solution of a reactant cesium bromide; 3, simultaneously adding the initial solution of a reactant lead bromide and the initial solution of a reactant cesium bromide to a reaction base solution in a dropwise manner while stirring, and carrying out a chemical co-precipitation reaction to obtain a cesium lead bromide precipitate; 4, carrying out washing and pumping filtration on the cesium lead bromide precipitate to remove impurities and impure phases; and 5, drying a product obtained in step 4 to obtain cesium lead bromide powder. The cesium lead bromide powder with high purity, few impure phases and particle uniformity is obtained through effectively improving the reaction proportion of a main reaction and inhibiting implementation of side reactions by controlling concentration of raw materials and the stoichiometric ratio of the reaction raw materials; and the problems of low purity, many impure phases and particle non-uniformity of cesium lead bromide powders prepared through present cesium lead bromide powder preparation methods are effectively solved.

Cesium lead bromide powder preparation method

The invention discloses a preparation method of bromine-lead-cesium single crystals. An ampoule which is plated with a carbon film and comprises a conical tip carries bromine-lead-cesium powder. The method specifically includes the following steps of vacuumizing and sealing the ampoule; heating the ampoule in a gradient mode in the direction from the conical tip to the top end of bromine-lead-cesium powder so that bromine-lead-cesium powder placed in the ampoule can be sufficiently molten; cooling the ampoule at a low speed till the temperature of the top end of bromine-lead-cesium powder is 0-5 DEG C lower than the solidifying point of bromine-lead-cesium, conducting heat preservation, and completing growth of bromine-lead-cesium single crystals; cooling bromine-lead-cesium single crystals in a staged mode, wherein bromine-lead-cesium single crystals are rapidly cooled through the first stage of rapid cooling, and bromine-lead-cesium single crystal phase change conversion is achieved through the second stage of slow cooling. According to the preparation method of bromine-lead-cesium single crystals, different cooling speeds are adopted in single crystal growth and single crystal cooling, the staged cooling method is adopted, the growth quality and the growth cycle of crystals are considered at the same time, and the problem that in the prior art, because of internal stress, bromine-lead-cesium single crystals crack in the single crystal preparation process is effectively solved.

Preparation method of bromine-lead-cesium single crystals

The invention discloses a multi-segment temperature control crystal growing furnace, which comprises a furnace body, an ampoule suspension device is arranged on the upper end of the furnace body, a furnace body thermal insulation layer is arranged at the outer part of the furnace body, and the furnace body is divided into an upper heat preservation region and a lower heat preservation region, the multi-segment temperature control crystal growing furnace is characterized in that a growing region is further arranged between the upper and lower heat preservation regions of the furnace body; the growing region comprises a plurality of heating units arranged in the axial direction of the furnace body, and thermal insulation layers are arranged between the adjacent heating units. The multi-segment temperature control crystal growing furnace of the invention has the advantages of adjusting the temperatures of the multi-segment heating units according to the demand to obtain a necessary temperature gradient section and a proper temperature gradient so as to realize the growth of large-sized and high-quality single crystals.

Multi-segment temperature control crystal growing furnace

The present invention discloses a method for preparing material of black alumina substrate used in multilayer wiring, namely adopts solid phase method, adds elements of Co, Mn, Cr, Si, Ti, B, V etc. into principal crystalline phase Al2O3 powder, modify oxide of alumina through adulterating, which recedes firing temperature, and brings out a black oxide of alumina organic doctor-blade casting method on the basis of modified powder, selects doctor-blade casting agent, double solvent and composite plasticizer that suitable for oxide of alumina; uniform and stable slurry with high solid content is obtained, bisque forming quality is enhanced; use doctor blade method for tape-casting, equipment simple and operational, natural drying process convenient, drying process will not lead rupture of billet body and phenomenon of unable stripping; obtained film body compact, and use mechanical drilling method to prepare stack basal lamina and obtain black alumina substrate used in multilayer wiring.

Yunxiang Hu

Papers

Low-temperature co-fired ceramic substrate material and preparation method thereof

Cesium lead bromide powder preparation method

Preparation method of bromine-lead-cesium single crystals

Multi-segment temperature control crystal growing furnace

Preparation of black alumina substrate for multilayered wiring