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June 13, 2013

Mtg: Splitting One Photon to Two Electrons: Toward Breaking the Single Junction Efficiency Limit

by @ 8:06 pm. Filed under ALL, Electrical/Power, Electronics Design, Optics/Displays, Semiconductors

TUESDAY July 9, 2013
SCV Nanotechnology Chapter
Speaker: Dr. Jiye Lee, Postdoctoral fellow, Molecular Foundry, LBNL
Time: Registration & pizza at 11:30 AM; Presentations at 12:00 PM Noon
Cost: IEEE Members: $5, Non-members: $10
Place: Texas Instruments (TI) Auditorium E-1, 2900 Semiconductor Drive, Santa Clara
RSVP: from website

Conventional solar cells generate one electron for each absorbed photon.  Any excess photon energy above the bandgap is wasted as heat.  This fundamental energy loss imposes the Shockley-Queisser limit of 34% for single optimized semiconductor junction.  Singlet fission, a nanoscale process in organic molecules, splits a high-energy molecular excitation into a pair of low-energy ones.  In solar cells, it promises to double the electricity generated from the blue part of the sunlight, breaking the single junction efficiency limit.
I will present fission-based photovoltaic cells that produce more than one electron per photon.  This is the first time that any solar cell has shown the peak photon-to-electron conversion efficiency exceeding 100% in the visible spectrum.  To further advance fission-enhanced solar cell nanotechnology, it is crucial to understand the fundamental mechanism governing singlet fission.  I will report on a universal mechanism that predicts the rate of singlet fission and confirm that fission is robust to variations in molecular nano-morphology.

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