According to the report of the Physicist Organization Network on June 2, American scientists have designed a new printing process that is not only faster than traditional methods, but also applicable to a variety of organic materials, and the performance of organic semiconductor films obtained is also excellent. Times. The researchers said in the latest issue of the journal Nature Materials Science that the latest developments are expected to lead the new revolution in organic electronics.
Organic electronic devices can be widely used in many fields, but even the best performance films at the moment have poor electrical conductivity. To this end, researchers at the Stanford Linear Accelerator Center (SLAC) and Stanford University under the US Department of Defense designed a new printing process. They found that by using new methods, films produced using certain materials have a conductivity that is 10 times that of the best films currently available. These semiconductor films can be used to make light and inexpensive solar cells, flexible electronic displays, and thin sensors.
"The more important thing is that the latest method can be upgraded to meet the industrial needs," said the main author of the paper, SLAGE/Stanford University postdoctoral Yan Ying.
Yan Ying said that in the rapid printing process, uneven distribution of the ink flow is likely to occur, which can make the obtained semiconductor crystals full, but in the past, few thought of solving the problem by controlling the flow of liquid. To break through, she controlled the flow of liquids that dissolve organic materials.
In the new method, Ying Ying designed a printing blade with a number of thin pillars (ie, crystals) embedded in it. The pillars were mixed with ink to form a uniform film. In addition, because the crystals are easily formed randomly on the pedestal, she designed a series of clever chemical patterns on the pedestal that inhibited the formation of "unruly" crystals and prevented these crystals from coming out. Finally, the Ying team created a large, almost straight line of crystal strips (thin films) through which charge can easily flow.
The research team conducted X-ray studies on the obtained organic semiconductors in the Stanford synchrotron light source (SSRL) laboratory, and based on the results, the new method was improved several times. Eventually, they proved that the performance of these neatly arranged crystals was at least It is 10 times larger than the crystal made by other technologies and it is also more structurally perfect.
The research team also repeated this experiment with another organic semiconductor material with almost completely different molecular structure. It was found that the quality of the obtained film was greatly improved. Therefore, they believe that this technology can be applied to a variety of materials.
The other two main investigators of the study, Stanford Materials and Energy Sciences Institute Professor Baozhan Nan (transliteration) and SLAC materials scientists Stefan and Mansfield said that next, they intend to find out between materials and processes. Hidden relationship. The latest research also allows them to better control the electronic properties of the printed material to optimize its performance. (Liu Xia)
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