In the photodetector according to Reuters almost everywhere, may be cameras, mobile phones, remote controls, solar cells, even in spacecraft panel is found, and therefore photoelectric conversion efficiency is essential. Recently, physicists at the University of California, Riverside, developed a new type of photodetector by combining two distinct inorganic materials and producing quantum mechanical processes.
The researchers stacked two atomic layers of tungsten diselenide (WSe2) on a single atomic layer of molybdenum diselenide (MoSe2). This stacking resulted in a much different performance than the parent layer, allowing for the generation of electrical energy at a minimum scale. . When a photon hits the WSe2 layer, an electron is released. When electrons reach the junction between WSe2 and MoSe2, electrons enter MoSe2 and release energy to push the second electron from WSe2 to MoSe2, both of which are free to move and generate electricity. In the existing solar panel model, one photon can generate at most one electron, and in the prototype developed by the institute, one photon can generate two or more electrons, which doubles or multiplies the efficiency.
The research results were published in the journal Nature-Nanotechnology. Ultra-thin materials can increase power while limiting heat generation, and will have broad implications in designing new ultra-efficient photovoltaic devices.
Editor: Yan Zhixiang
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