Scientists from MIT have sensitized existing silicon sól cells by singlet exciton fission method. This can increase efficiency of sól cells from 18 percent to as high as 35 percent thus doubling energy output thereby reducing costs of solar technology.
Það er að verða brýnt að draga úr ósjálfstæði okkar á jarðefnaeldsneyti og byggja upp tækni fyrir sjálfbæra framtíð. Sólarorka er endurnýjanleg uppspretta orka þar sem Sólar light is converted into electrical energy. Sólfrumur are most commonly made of silicon which uses photovoltaic process to transform sólarljós into electricity. Tandem cells are also being designed which generally include perovskites cells where every section of the sól cells can harness Sólar energy from its varied spectrum and thus have higher efficiency. Solar cells available today are limited by their efficiency which is just 15-22 percent.
Rannsókn sem birt var 3. júlí í Nature hefur sýnt fram á hvernig sílikon sól cell efficiencies could be raised to as high as 35 percent by applying an effect called singlet exciton fission. In this effect a single particle of light (photon) can generate two electron-hole pairs as opposed to only one. Single exciton fission is seen in many materials since its discovery in the 1970s. The current study aimed to translate this effect for the first time into a viable sól klefi.
Researchers transferred single exciton fission effect from tetracene – a known material which exhibits it – into crystalline silicon. This material tetracene is a hydrocarbon lífræn semiconductor. The transfer was achieved by placing an additional thin layer of hafnium oxynitride (8 angstrom) between excitonic tetracene layer and silicon sól cell and coupling them.
This tiny hafnium oxynitride layer acted as a bridge and made possible the generation of high energy photons in the tetracene layer which then triggered release of two electrons in the silicon cell as opposed to the usual one. This sensitization of silicon sól cell reduced thermalization losses and enabled better sensitivity to light. The energy output of the sól cells doubled as more output was generated from green and blue parts of the spectrum. This can enhance the efficiency of sól cells to as high as 35 percent. The technology differs from the tandem solar cells as it just adds more current to the silicon without adding additional cells.
Núverandi rannsókn hefur sýnt fram á spunaklofnar kísilsólfrumur sem geta sýnt aukna skilvirkni og þannig dregið úr heildarorkuframleiðslukostnaði sólartækni.
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{Þú getur lesið upprunalegu rannsóknarritgerðina með því að smella á DOI hlekkinn sem gefinn er upp hér að neðan á listanum yfir tilvitnaðar heimildir}
Heimildir)
Einzinger, M. o.fl. 2019. Næmni kísils með singlet exciton fission í tetracene. Náttúran. 571. https://doi.org/10.1038/s41586-019-1339-4
