Singlet fission photovoltaics: splitting one photon to two electrons

Add to your list(s) Download to your calendar using vCal

• Dr. Jiye Lee, Lawrence Berkeley National Laboratory, U.S
• Monday 11 November 2013, 12:00-13:00
• Kapitza Building Seminar Room, Cavendish Laboratory, Department of Physics.

If you have a question about this talk, please contact Dr. Felix Deschler.

Conventional solar cells generate one electron for each absorbed photon. Any excess photon energy above the bandgap is wasted as heat. This leads to the Shockley-Queisser efficiency limit of 34% for solar cells containing a single semiconductor junction. Singlet exciton fission splits a high-energy singlet exciton into a pair of low-energy triplets. In solar cells, it promises to double the electricity generated from the blue part of the sunlight, breaking the single junction efficiency limit. ​Moving toward the goal of developing solar cells that overcome the Shockley-Queisser limit, we demonstrate fission-based photovoltaic cells that produce more than one electron per incident photon. It is the first time that any solar cell has shown the photon-to-electron conversion efficiency exceeding 100% in the visible spectrum. Continuous advances in fission-based photovoltaics require understanding the fundamental mechanism governing singlet fission. We present a universal model that successfully predicts the rate of fission and confirm that fission is robust to variations in molecular morphology.

This talk is part of the Optoelectronics Group series.

This talk is included in these lists:

• All Cavendish Laboratory Seminars
• All Talks (aka the CURE list)
• Centre for Health Leadership and Enterprise
• Featured lists
• Kapitza Building Seminar Room, Cavendish Laboratory, Department of Physics
• ME Seminar
• Neurons, Fake News, DNA and your iPhone: The Mathematics of Information
• Optoelectronics Group
• School of Physical Sciences
• Thin Film Magnetic Talks
• few29

Note that ex-directory lists are not shown.