Some materials convert photons into more free charges than would be expected. Using an ultrafast film, researchers have now been able to get a picture of this process. Researchers at the Fritz Haber Institute of the Max Planck Society, the Technical University of Berlin, and the Julius-Maximili
Illustration of exciton splitting in the organic semiconductor pentacene, which consists of five benzene rings each. Instead of the usual two free charge carriers, absorption of a photon in pentacene generates four free charge carriers, represented by orange tracks. Credit: TU Berlin
Researchers at the Fritz Haber Institute of the Max Planck Society, the Technical University of Berlin, and the Julius-Maximilians-Universität Würzburg have used ultrafast film to capture the process of exciton fission, which could significantly increase solar cell efficiency.
A team of researchers at the Fritz Haber Institute of the Max Planck Society, the Technical University of Berlin, and the Julius-Maximilians-Universität Würzburg have now deciphered the first step of this process by recording an ultrafast movie of the photon-to-electricity conversion process, resolving a decades-old debate about the mechanism of the process.
“Seeing these charge carrier pairs was crucial to decipher the process,” says Alexander Neef, from the Fritz Haber Institute and the first author of the study. “An excited electron-hole pair not only has a specific energy but also adapts distinct patterns, which are called orbitals. To understand the process of singlet fission it is such essential to identify the orbital shapes of the charge carriers and how these change over time.
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