Are TV, computer, and mobile phone screens all rigid? Are solar panels flat? The industrial fair, which will open next Tuesday, gives a negative answer. Universities in Shanghai focused on exhibiting high-tech materials for the Industrial Fair, among which “Nobel Prize†-based materials, nano-technology flexible display screens and thin-film photovoltaic cells have become thin and soft, and can even be rolled and folded. Perhaps one day in the future, we will take out the rollable TV and lay it flat on the wall like the ancients released the roll.
When Jiaotong University researchers use graphene as the electrode material, the graphene film grown in a large area is transferred to any flexible material, and then bent and folded
The 2010 Nobel Prize in Physics was "granted" to graphene. This material is a two-dimensional crystal composed of a single layer of carbon atoms with a thickness of only one carbon atom. The team of Chen Xianfeng, professor of the Department of Physics and Astronomy of Shanghai Jiaotong University, tried to replace the conductive film "Indium Tin Oxide (ITO)" of traditional display screens with graphene, and independently developed ultraviolet and ozone vacuum equipment to clean and dope graphene Change its conductive properties and develop into transparent conductive materials. Unlike the brittle nature of "Indium Tin Oxide", large-area graphene films can be transferred to flexible materials and twist and flex arbitrarily. The project is currently being developed commercially, and paper-like display equipment is expected to come true.
How do solar cells adapt to the curves and arcs of buildings, vehicles, and even clothing? Rely on thin-film photovoltaic cells that do not use crystalline silicon. But at present, the photoelectric conversion efficiency of thin-film batteries is only about 10%, which is still a few percentage points lower than that of mainstream flat-panel batteries composed of crystalline silicon. The Nano Center of the Physics Department of East China Normal University coats the battery film with a transparent nano film. This layer of small nano particles can absorb ultraviolet light that cannot participate in photoelectric conversion in sunlight, and can be converted into visible light that is easy to absorb and use. Increase by 1 percentage point. At the same time, the removal of ultraviolet light also reduces irradiation damage and increases battery life and stability.
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