'Turbo-charged' silicon photovoltaic (pv), scientists at the Massachusetts institute of technology explore singlet exciton fission

Solar photovoltaic webex: scientists at the Massachusetts institute of technology have developed a device that say it can give single junction silicon photovoltaic cells & other; Turbocharging & throughout; , to push the efficiency of this technology to the theory of limit, reach 35% or more.

published last week in the journal nature, a paper detailed describes how the scientists at the Massachusetts institute of technology to prove how the singlet exciton fission effect applied to silicon solar cells, and as much as 35% of cell efficiency can be realized. Singlet exciton fission is a kind of effect that exists in some materials, including a single photon, Particles of light) In be absorbed to the solar cell can produce two electronic & ndash; — Hole pair, rather than the usual one. In the early 1970 s, scientists have observed this effect. In the past decade some major research institutions around the world have it as a important field of study, but this effect can be converted to feasible solar cells has been proven is not easy. In the thesis by singlet exciton fission sensitizing silicon ', for the first time scientists claim to this effect from a known & other; Exciton & throughout; Material transfer to the target & ndash; — The tetracene ( A hydrocarbon organic semiconductors) Transferred to crystalline silicon. They through the silicon solar cell and exciton and four benzene is placed between the thickness of only a few atoms hafnium oxide layer, achieved this feat.

　　“ Facts have proven that in the interface between the two systems, this a very thin layer of material eventually become the key to success, & throughout; Behavior excited at the Massachusetts institute of technology center of graduate Markus Einziger explains, & other; That is why other researchers can't let this process play a role, but we finally made it. ”

hafnium oxide layer effect is like a & other; To pass the bridge & throughout; , making it tetracene layer of high-energy photons can trigger the release of two electrons in the silicon cells. Scientists report that made the discovery spectra of green and blue part of the energy output has doubled.

however, even though they speculate that the development of silicon solar cell efficiency can be raised to the highest 35% & ndash; — More than single junction silicon solar theory limit, but they did not give the experiment efficiency actually reached.

the researchers said, although they new paper gives the effective coupling of two materials & other; The key steps & throughout; , but they still have work to do. Electrical engineering and computer science at the Massachusetts institute of technology professor Marc Baldo said: & other; We still need for the process optimization silicon cells. In general, business applications could take years. ”

at the Massachusetts institute of technology researchers are keen to continue to explore in this field, they will be called for silicon solar cell & other; Turbocharging & throughout; 。 Now this is different from the most frequently adopted the focus of the cascade of method to improve the efficiency of the solar cell battery concept. “ We are to inject more current in silicon and not to make the two batteries, & throughout; Baldo said.

the team will continue to use these materials, and is expected to realize single junction silicon efficiency, even more than 35% of the theoretical value. “ We know hafnium oxide will generate additional charges at the interfaces, through the passivation process of reducing wear and tear, referred to as the electric field throughout the &; Einziger, & other; If we are able to better control of this kind of phenomenon, is likely to become more efficient. ”

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