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2013 ; 4
(1
): 19-45
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Multiple Exciton Generation in Colloidal Nanocrystals
#MMPMID28348283
Smith C
; Binks D
Nanomaterials (Basel)
2013[Dec]; 4
(1
): 19-45
PMID28348283
show ga
In a conventional solar cell, the energy of an absorbed photon in excess of the
band gap is rapidly lost as heat, and this is one of the main reasons that the
theoretical efficiency is limited to ~33%. However, an alternative process,
multiple exciton generation (MEG), can occur in colloidal quantum dots. Here,
some or all of the excess energy is instead used to promote one or more
additional electrons to the conduction band, potentially increasing the
photocurrent of a solar cell and thereby its output efficiency. This review will
describe the development of this field over the decade since the first
experimental demonstration of multiple exciton generation, including the
controversies over experimental artefacts, comparison with similar effects in
bulk materials, and the underlying mechanisms. We will also describe the current
state-of-the-art and outline promising directions for further development.
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