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Orbital Topology Controlling Charge Injection in Quantum-Dot-Sensitized Solar Cells

Hansen, Thorsten LU ; Zidek, Karel LU ; Zheng, Kaibo LU ; Qenawy, Mohamed LU ; Chabera, Pavel LU ; Persson, Petter LU and Pullerits, Tönu LU (2014) In The Journal of Physical Chemistry Letters 5(7). p.1157-1162
Abstract
Quantum-dot-sensitized solar cells are emerging as a promising development of dye-sensitized solar cells, where photostable semiconductor quantum dots replace molecular dyes. Upon photoexcitation of a quantum dot, an electron is transferred to a high-band-gap metal oxide. Swift electron transfer is crucial to ensure a high overall efficiency of the solar cell. Using femtosecond time-resolved spectroscopy, we find the rate of electron transfer to be surprisingly sensitive to the chemical structure of the linker molecules that attach the quantum dots to the metal oxide. A rectangular barrier model is unable to capture the observed variation. Applying bridge-mediated electron-transfer theory, we find that the electron-transfer rates depend on... (More)
Quantum-dot-sensitized solar cells are emerging as a promising development of dye-sensitized solar cells, where photostable semiconductor quantum dots replace molecular dyes. Upon photoexcitation of a quantum dot, an electron is transferred to a high-band-gap metal oxide. Swift electron transfer is crucial to ensure a high overall efficiency of the solar cell. Using femtosecond time-resolved spectroscopy, we find the rate of electron transfer to be surprisingly sensitive to the chemical structure of the linker molecules that attach the quantum dots to the metal oxide. A rectangular barrier model is unable to capture the observed variation. Applying bridge-mediated electron-transfer theory, we find that the electron-transfer rates depend on the topology of the frontier orbital of the molecular linker. This promises the capability of fine tuning the electron-transfer rates by rational design of the linker molecules. (Less)
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author
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organization
publishing date
type
Contribution to journal
publication status
published
subject
in
The Journal of Physical Chemistry Letters
volume
5
issue
7
pages
1157 - 1162
publisher
The American Chemical Society (ACS)
external identifiers
  • wos:000333947700018
  • scopus:84898076784
  • pmid:26274464
ISSN
1948-7185
DOI
10.1021/jz5001193
language
English
LU publication?
yes
additional info
The information about affiliations in this record was updated in December 2015. The record was previously connected to the following departments: Chemical Physics (S) (011001060), Theoretical Chemistry (S) (011001039)
id
b0c2eedf-1faf-4df1-9d70-44f4ce0bdbb3 (old id 4439560)
date added to LUP
2016-04-01 13:45:37
date last changed
2023-09-03 04:41:08
@article{b0c2eedf-1faf-4df1-9d70-44f4ce0bdbb3,
  abstract     = {{Quantum-dot-sensitized solar cells are emerging as a promising development of dye-sensitized solar cells, where photostable semiconductor quantum dots replace molecular dyes. Upon photoexcitation of a quantum dot, an electron is transferred to a high-band-gap metal oxide. Swift electron transfer is crucial to ensure a high overall efficiency of the solar cell. Using femtosecond time-resolved spectroscopy, we find the rate of electron transfer to be surprisingly sensitive to the chemical structure of the linker molecules that attach the quantum dots to the metal oxide. A rectangular barrier model is unable to capture the observed variation. Applying bridge-mediated electron-transfer theory, we find that the electron-transfer rates depend on the topology of the frontier orbital of the molecular linker. This promises the capability of fine tuning the electron-transfer rates by rational design of the linker molecules.}},
  author       = {{Hansen, Thorsten and Zidek, Karel and Zheng, Kaibo and Qenawy, Mohamed and Chabera, Pavel and Persson, Petter and Pullerits, Tönu}},
  issn         = {{1948-7185}},
  language     = {{eng}},
  number       = {{7}},
  pages        = {{1157--1162}},
  publisher    = {{The American Chemical Society (ACS)}},
  series       = {{The Journal of Physical Chemistry Letters}},
  title        = {{Orbital Topology Controlling Charge Injection in Quantum-Dot-Sensitized Solar Cells}},
  url          = {{http://dx.doi.org/10.1021/jz5001193}},
  doi          = {{10.1021/jz5001193}},
  volume       = {{5}},
  year         = {{2014}},
}