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Lecture Ferdinand C. Grozema

Rooster

WanneerWaar
31 maart 2011 FWN-Building 5114.0004, Nijenborgh 4, 9747 AG, Groningen
Speaker: Dr. Ferdinand C. Grozema
Affiliation: Delft University of Technology
Title: More efficient use of sunlight in photovoltaics: singlet excitation fission and infrared upconversion
Date: Thu Mar 31, 2011
Start: 14.00
Location: FWN-Building 5114.0004
Host: R. Broer
Telephone: +31 50 363 4374

Abstract

In current photovoltaics more than half of the energy from sunlight that falls on a solar cells is wasted by inefficient use of the photons. Photons in the blue part of the spectrum lose a lot of their energy as heat by relaxation to the band gap of Si, while red photons with energies below 1.1 eV are not absorbed at all. In this work we try to use the energy from the sun more efficiently by employing two related processes: Singlet exciton fission, making it possible to use the excess energy in high energy photons to excite an additional electron, and infrared up-conversion by triplet-triplet annihilation, a process in which two infrared photons are combined into one visible photon.

Laatst gewijzigd:22 oktober 2012 14:30