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XPS and UPS characterization of the TiO2/ZnPcGly heterointerface: Aligmment of energy levels

Liu, GM ; Jaegermann, W ; He, Jianjun LU ; Sundström, Villy LU and Sun, LC (2002) In The Journal of Physical Chemistry Part B 106(23). p.5814-5819
Abstract
The electronic structure and the highest occupied molecular orbitals (HOMO)/the lowest unoccupied molecular orbitals (LUMO) alignment at the molecular semiconductor heterointerface of nanostructured TiO2/ZnPcGly dye sensitizer were characterized by X-ray and ultraviolet photoemission spectroscopy (XPS and UPS). The HOMO level of the dye ZnPcGly was determined to be located at 1.62 eV below the Fermi edge, and the corresponding LUMO level was estimated to be 0.10 eV above the conduction band of TiO2 based on the HOMO/LUMO gap (1.82 eV) of ZnPcGly determined by optical absorption measurements. This energy level matching between the orbitals of the dye and the bands of TiO2 can enable efficient electron transfer from photoexcited ZnPcGly to... (More)
The electronic structure and the highest occupied molecular orbitals (HOMO)/the lowest unoccupied molecular orbitals (LUMO) alignment at the molecular semiconductor heterointerface of nanostructured TiO2/ZnPcGly dye sensitizer were characterized by X-ray and ultraviolet photoemission spectroscopy (XPS and UPS). The HOMO level of the dye ZnPcGly was determined to be located at 1.62 eV below the Fermi edge, and the corresponding LUMO level was estimated to be 0.10 eV above the conduction band of TiO2 based on the HOMO/LUMO gap (1.82 eV) of ZnPcGly determined by optical absorption measurements. This energy level matching between the orbitals of the dye and the bands of TiO2 can enable efficient electron transfer from photoexcited ZnPcGly to TiO2, which is very important in photoinduced charge-transfer reactions and for applications in dye-sensitized solar cells. (Less)
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author
; ; ; and
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
The Journal of Physical Chemistry Part B
volume
106
issue
23
pages
5814 - 5819
publisher
The American Chemical Society (ACS)
external identifiers
  • wos:000176161900003
  • scopus:0037071964
ISSN
1520-5207
DOI
10.1021/jp014192b
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)
id
1a9e8b91-38c8-4084-9fd3-91380c98408b (old id 335490)
date added to LUP
2016-04-01 15:53:15
date last changed
2020-12-27 03:29:21
@article{1a9e8b91-38c8-4084-9fd3-91380c98408b,
  abstract     = {The electronic structure and the highest occupied molecular orbitals (HOMO)/the lowest unoccupied molecular orbitals (LUMO) alignment at the molecular semiconductor heterointerface of nanostructured TiO2/ZnPcGly dye sensitizer were characterized by X-ray and ultraviolet photoemission spectroscopy (XPS and UPS). The HOMO level of the dye ZnPcGly was determined to be located at 1.62 eV below the Fermi edge, and the corresponding LUMO level was estimated to be 0.10 eV above the conduction band of TiO2 based on the HOMO/LUMO gap (1.82 eV) of ZnPcGly determined by optical absorption measurements. This energy level matching between the orbitals of the dye and the bands of TiO2 can enable efficient electron transfer from photoexcited ZnPcGly to TiO2, which is very important in photoinduced charge-transfer reactions and for applications in dye-sensitized solar cells.},
  author       = {Liu, GM and Jaegermann, W and He, Jianjun and Sundström, Villy and Sun, LC},
  issn         = {1520-5207},
  language     = {eng},
  number       = {23},
  pages        = {5814--5819},
  publisher    = {The American Chemical Society (ACS)},
  series       = {The Journal of Physical Chemistry Part B},
  title        = {XPS and UPS characterization of the TiO2/ZnPcGly heterointerface: Aligmment of energy levels},
  url          = {http://dx.doi.org/10.1021/jp014192b},
  doi          = {10.1021/jp014192b},
  volume       = {106},
  year         = {2002},
}