Advanced

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)
Please use this url to cite or link to this publication:
author
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
external identifiers
  • wos:000333947700018
  • scopus:84898076784
ISSN
1948-7185
DOI
10.1021/jz5001193
language
English
LU publication?
yes
id
b0c2eedf-1faf-4df1-9d70-44f4ce0bdbb3 (old id 4439560)
date added to LUP
2014-05-20 11:48:25
date last changed
2017-09-17 06:17:29
@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},
  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},
  volume       = {5},
  year         = {2014},
}