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Optimization schemes for efficient multiple exciton generation and extraction in colloidal quantum dots

Damtie, Fikeraddis A. LU ; Karki, Khadga J. LU ; Pullerits, Tönu LU and Wacker, Andreas LU (2016) In Journal of Chemical Physics 145(6).
Abstract

Multiple exciton generation (MEG) is a process in which more than one electron hole pair is generated per absorbed photon. It allows us to increase the efficiency of solar energy harvesting. Experimental studies have shown the multiple exciton generation yield of 1.2 in isolated colloidal quantum dots. However real photoelectric devices require the extraction of electron hole pairs to electric contacts. We provide a systematic study of the corresponding quantum coherent processes including extraction and injection and show that a proper design of extraction and injection rates enhances the yield significantly up to values around 1.6.

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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Journal of Chemical Physics
volume
145
issue
6
publisher
American Institute of Physics
external identifiers
  • scopus:84982113307
  • wos:000381680300038
ISSN
0021-9606
DOI
10.1063/1.4960507
language
English
LU publication?
yes
id
15694022-9c2d-4c85-94e6-041902b23b38
alternative location
http://scitation.aip.org/content/aip/journal/jcp/145/6/10.1063/1.4960507
date added to LUP
2016-09-05 21:23:25
date last changed
2017-08-12 00:01:00
@article{15694022-9c2d-4c85-94e6-041902b23b38,
  abstract     = {<p>Multiple exciton generation (MEG) is a process in which more than one electron hole pair is generated per absorbed photon. It allows us to increase the efficiency of solar energy harvesting. Experimental studies have shown the multiple exciton generation yield of 1.2 in isolated colloidal quantum dots. However real photoelectric devices require the extraction of electron hole pairs to electric contacts. We provide a systematic study of the corresponding quantum coherent processes including extraction and injection and show that a proper design of extraction and injection rates enhances the yield significantly up to values around 1.6.</p>},
  articleno    = {064703},
  author       = {Damtie, Fikeraddis A. and Karki, Khadga J. and Pullerits, Tönu and Wacker, Andreas},
  issn         = {0021-9606},
  language     = {eng},
  month        = {08},
  number       = {6},
  publisher    = {American Institute of Physics},
  series       = {Journal of Chemical Physics},
  title        = {Optimization schemes for efficient multiple exciton generation and extraction in colloidal quantum dots},
  url          = {http://dx.doi.org/10.1063/1.4960507},
  volume       = {145},
  year         = {2016},
}