Enhancing photo voltaic effectivity with upconversion


Aug 03, 2022

(Nanowerk Information) Photo voltaic cell applied sciences have been enhancing incrementally over the many years, however power conversion has remained lower than optimum. Now, researchers at Kyoto College have developed a novel wafer bonding expertise utilizing an optical upconversion materials that transforms daylight to shorter-wavelengths. This new semiconductor course of makes use of the interface’s optical operate for bond formation (Utilized Physics Letters, “Upconversion semiconductor interfaces by wafer bonding for photovoltaic functions”). Semiconductor bonding mediated by upconversion material Semiconductor bonding mediated by upconversion materials. (Picture: Katsuaki Tanabe, Kyoto College) The staff created a stacked construction consisting of a skinny silicon movie mimicking the higher subcell of a multi-junction photo voltaic cell and a silicon photo voltaic cell wafer; these layers had been bonded with an adhesive produced from upconversion nanoparticles dispersed in a hydrogel. Typical multi-junction photo voltaic cells are created with the vapor section progress methodology. Nonetheless, this methodology is proscribed by lattice matching in semiconductor supplies. The staff, led by Katsuaki Tanabe, has utilized their wafer bonding methodology to the manufacturing of a spread of optical and digital gadgets, demonstrating that completely different semiconductor supplies may be stacked in any mixture with out the restriction of lattice matching. “Even inherently non-absorbed mild of longer wavelengths within the decrease subcell of a multi-junction photo voltaic cell could possibly be used to boost the effectivity of the general power conversion through our upconverting interface,” concludes the creator.


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