Structure-dependent 4-tert-butyl pyridine-induced band bending at TiO2 surfaces

Göthelid, Mats, Yu, Shun, Ahmadi, Sareh, Sun, Chenghua and Zuleta, Marcelo (2011) Structure-dependent 4-tert-butyl pyridine-induced band bending at TiO2 surfaces. International Journal of Photoenergy, 2011 401356: 1-6. doi:10.1155/2011/401356

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Author Göthelid, Mats
Yu, Shun
Ahmadi, Sareh
Sun, Chenghua
Zuleta, Marcelo
Title Structure-dependent 4-tert-butyl pyridine-induced band bending at TiO2 surfaces
Formatted title
Structure-dependent 4-tert-butyl pyridine-induced band bending at TiO2 surfaces
Journal name International Journal of Photoenergy   Check publisher's open access policy
ISSN 1110-662X
1687-529X
Publication date 2011
Sub-type Article (original research)
DOI 10.1155/2011/401356
Open Access Status DOI
Volume 2011
Issue 401356
Start page 1
End page 6
Total pages 6
Collection year 2012
Language eng
Formatted abstract
The role of 4-tert butyl pyridine (4TBP) adsorption on TiO2 surface band bending has been studied using photoelectron spectroscopy. Surface oxygen vacancies pin the Fermi level near the conduction band edge on rutile (110). 4TBP preferentially adsorbs in those vacancies and shift the Fermi level to lower binding energy in the band gap. This is done by transferring vacancy excess charge into the empty 𝜋 orbital in the pyridine ring. The anatase (100) surface contains much less oxygen vacancies although the surface is much rougher than the rutile (110). 4TBP adsorption does not have any significant effect on the surface band bending. Thus the positive role associated with 4TBP addition to solar cell electrolytes is suggested to protection against adsorption of other electrolyte components such as Li and I.
Keyword Sensitized solar-cells
Nanocrystalline TiO2
Recombination
Electrolytes
Adsorption
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

 
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Created: Sun, 07 Nov 2010, 00:09:03 EST