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Electronic structure of C-60/phthalocyanine/ITO interfaces studied using soft x-ray spectroscopies
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Cho, S. W., Piper, L. F. J., DeMasi, A., Preston, A. R. H., Smith, K. E., Chauhan, K. V., Sullivan, Paul J., Hatton, Ross A. and Jones, T. S. (Tim S.) (2010) Electronic structure of C-60/phthalocyanine/ITO interfaces studied using soft x-ray spectroscopies. Journal of Physical Chemistry C, Vol.114 (No.4). pp. 1928-1933. doi:10.1021/jp910504a ISSN 1932-7447.
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Official URL: http://dx.doi.org/10.1021/jp910504a
Abstract
The interface electronic structure of a bilayer heterojunction Of C-60 and three different phthalocyanines grown on indium tin oxide (ITO) has been studied using synchrotron radiation-excited photoelectron spectroscopy. The energy difference between the highest occupied molecular orbital level of the phthalocyanine (donor) layer and the lowest unoccupied molecular orbital level of the C60 (acceptor) layer (E-HOMO(D) - E-LUMO(A)) was determined. The E-HOMO(D) - E-LUMO(A) of a heterojunction with boron subphthalocyanine chloride (SubPc) was found to be much larger than those of copper phthalocyanine (CuPc) and chloro-aluminum phthalocyanine (CIAIPc). This observation is discussed in terms of the difference of the ionization energy of each donor material. Additionally, we have studied the molecular orientation of the phthalocyanine films on ITO using angle-dependent X-ray absorption spectroscopy. We found that the SubPc films showed significant disorder compared to the CuPc and CIAIPc films and also found that E-HOMO(D) - E-LUMO(A) varied with the orientation of the CIAIPc molecules relative to the ITO substrate. This orientation could be controlled by varying the CIAIPc deposition rate.
Item Type: | Journal Article | ||||
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Subjects: | Q Science > QD Chemistry T Technology T Technology > TA Engineering (General). Civil engineering (General) |
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Divisions: | Faculty of Science, Engineering and Medicine > Science > Chemistry | ||||
Journal or Publication Title: | Journal of Physical Chemistry C | ||||
Publisher: | American Chemical Society | ||||
ISSN: | 1932-7447 | ||||
Official Date: | 4 February 2010 | ||||
Dates: |
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Volume: | Vol.114 | ||||
Number: | No.4 | ||||
Number of Pages: | 6 | ||||
Page Range: | pp. 1928-1933 | ||||
DOI: | 10.1021/jp910504a | ||||
Status: | Peer Reviewed | ||||
Publication Status: | Published | ||||
Access rights to Published version: | Restricted or Subscription Access | ||||
Funder: | NSF, U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences, Engineering and Physical Sciences Research Council (EPSRC), Royal Academy of Engineering | ||||
Grant number: | CHE-0807368, DE-AC02-98CH10886 |
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