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SUMMARY:Singlet fission photovoltaics: splitting one photon to two electro
 ns - Dr. Jiye Lee\, Lawrence Berkeley National Laboratory\, U.S
DTSTART:20131111T120000Z
DTEND:20131111T130000Z
UID:TALK47794@talks.cam.ac.uk
CONTACT:Dr. Felix Deschler
DESCRIPTION:Conventional solar cells generate one electron for each absorb
 ed photon. Any excess photon energy above the bandgap is wasted as heat. T
 his leads to the Shockley-Queisser efficiency limit of 34% for solar cells
  containing a single semiconductor junction. Singlet exciton fission split
 s a high-energy singlet exciton into a pair of low-energy triplets. In sol
 ar cells\, it promises to double the electricity generated from the blue p
 art of the sunlight\, breaking the single junction efficiency limit.\n​M
 oving toward the goal of developing solar cells that overcome the Shockley
 -Queisser limit\, we demonstrate fission-based photovoltaic cells that pro
 duce more than one electron per incident photon. It is the first time that
  any solar cell has shown the photon-to-electron conversion efficiency exc
 eeding 100% in the visible spectrum. Continuous advances in fission-based 
 photovoltaics require understanding the fundamental mechanism governing si
 nglet fission. We present a universal model that successfully predicts the
  rate of fission and confirm that fission is robust to variations in molec
 ular morphology.
LOCATION:Kapitza Building Seminar Room\, Cavendish Laboratory\, Department
  of Physics
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