Chinese and South Korean scholars work together to develop a new generation of flexible image sensor materials

Recently, the team of Professor Wang Min and Professor Chen Yi Qing from Hefei University of Technology, cooperated with researchers at Sungkyunkwan University in Korea, prepared a large-grain non-layered nickel selenide thin film for the first time and built it into a photodetector array successfully. A new generation of flexible image sensor research and development provides a new method. The international academic journal "Advanced Materials" recently published the results.

Image sensors can convert optical images into electronic information and are widely used in electro-optical devices. The future of wearable smart devices requires that the image sensor be flexible and can be bent and folded. At present, the integrated image sensor which is widely used in digital cameras is difficult to meet the future demand because of its lack of flexibility. Current research suggests that flexible, low-dimensional materials are ideal candidates for silicon substrates.

Hefei University of Technology and South Korea Sungkyunkwan University recently formed a joint research team, proposed a new method of interface limited epitaxial growth, the successful preparation of high-quality large non-layered structure of nickel selenide thin film. Through the pattern growth of nickel selenide micron band array, they constructed a high performance and uniform light detector array, which laid the foundation for the realization of flexible image sensor.

According to reports, due to the microgranular grain size of the new material film, the grain boundaries between the grains are reduced, which significantly reduces the carrier scattering at the grain boundaries, thereby greatly improving the responsivity of the photodetector. The experimental results show that the photodetector prepared with high quality nickel selenide film based on micrometer-scale crystal grains can achieve a current of 150 A per watt of light, and its responsivity is increased by four orders of magnitude compared with that of the nanoscale grain film.

PTA Powder

Main application:Repair and strengthen workpiece surface, significantly

Welding method:PTA welding

Main equipment:PTA welding machine

Flame core temperature: about 10000℃

Technological characteristics:PTA has high temperature, concentrated energy, stable combustion, small heat affected zone, fast welding speed, high production efficiency, easy to obtain low dilution rate of surfacing layer, surfacing layer and workpiece matrix are metallurgical bonding,, bonding strength is high.

PTA welding technology is one of surface strengthening methods, which has high deposition rate, low dilution rate, and could be applied with many kinds of powder. The manufacturing craft of PTA powder is normally gas atomization, which reduces satellite of powder. We supply 4 main categories of PTA powder: Nickel-based alloy powder, Iron-based alloy powder, Cobalt-based alloy powder and Mixed Powder.

Nickel Based Alloy Powder possesses high temperature resistance and wear resistance, it is the most popular alloy powder applied by PTA welding both domestically and internationally. Coating hardness is within the range of HRC 30-60. It could be applied to various industries like agriculture, plastic, paper, marine and steel making where wear and corrosion protection needed. Some examples are plunger, moulds, pump leaf and screw.

Iron Based Alloy Powder is more widely used and a more economic choice. With high abrasive resistance, it is more commonly applied to mining tools, drilling tools and mixers of iron and steel making industry, coal industry, shaft, oil and energy industry.

Cobalt Based Alloy Powder is recommended for corrosion and oxidation resistance, with better hot hardness values than equivalent Nickel based alloy powder. It is widely applied to steel making industry, coal industry and mining industry.

Mixed powder mainly refers to NiCrBSi mixing with other hard-phase powder such as cast tungsten carbide and other cemented alloy powder, which allows the powder better hardness around HRC60 and excellent abrasion resistance.

Mixed powder is more often used for mining equipment for oil sands, lignite, oil drilling tools, excavator buckets, extrusion screws for plastic processing, grain and oil processing, etc.

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