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Phase and molecular orientation in metal-free phthalocyanine films on conducting glass: Characterization of two deposition methods

Alfredsson, Y; Ahlund, J; Nilson, K; Kjeldgaard, Lisbeth LU ; O'Shea, JN; Theobald, J; Bao, Z; Martensson, N; Sandell, A and Puglia, C, et al. (2005) In Thin Solid Films 493(1-2). p.13-19
Abstract
in this study, metal-free phthalocyanine has been deposited on a conducting glass surface by two methods: by spreading the molecular powder directly on the substrate in air and by vapor sublimation under ultra-high vacuum conditions (evaporation). The films have been characterized by means of core level X-ray Photoemission Spectroscopy, X-ray Absorption Spectroscopy (XAS) and Ultra Violet and Visible absorption spectroscopy (UV-Vis). Our results show that the two deposition methods produce molecular overlayers in different polymorphic phases; the UV-Vis measurements indicate that the film obtained by powder deposition is of x-phase type whereas sublimation leads to an a-polymorph structure. The XAS results show that in the powder deposited... (More)
in this study, metal-free phthalocyanine has been deposited on a conducting glass surface by two methods: by spreading the molecular powder directly on the substrate in air and by vapor sublimation under ultra-high vacuum conditions (evaporation). The films have been characterized by means of core level X-ray Photoemission Spectroscopy, X-ray Absorption Spectroscopy (XAS) and Ultra Violet and Visible absorption spectroscopy (UV-Vis). Our results show that the two deposition methods produce molecular overlayers in different polymorphic phases; the UV-Vis measurements indicate that the film obtained by powder deposition is of x-phase type whereas sublimation leads to an a-polymorph structure. The XAS results show that in the powder deposited film the molecules are mainly oriented parallel to the surface. This is opposite to the case of the vapor deposited film, where the molecules mainly are oriented orthogonal to the surface. (Less)
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type
Contribution to journal
publication status
published
subject
keywords
spectroscopy, X-ray absorption, metal-free phthalocyanine, deposition process, X-ray photoemission spectroscopy
in
Thin Solid Films
volume
493
issue
1-2
pages
13 - 19
publisher
Elsevier
external identifiers
  • wos:000233150700003
  • scopus:27144490035
ISSN
0040-6090
DOI
10.1016/j.tsf.2005.05.012
language
English
LU publication?
yes
id
b58f9521-a5f7-4195-aa68-ab927e1909ba (old id 213620)
date added to LUP
2007-08-21 11:34:32
date last changed
2017-01-01 07:04:31
@article{b58f9521-a5f7-4195-aa68-ab927e1909ba,
  abstract     = {in this study, metal-free phthalocyanine has been deposited on a conducting glass surface by two methods: by spreading the molecular powder directly on the substrate in air and by vapor sublimation under ultra-high vacuum conditions (evaporation). The films have been characterized by means of core level X-ray Photoemission Spectroscopy, X-ray Absorption Spectroscopy (XAS) and Ultra Violet and Visible absorption spectroscopy (UV-Vis). Our results show that the two deposition methods produce molecular overlayers in different polymorphic phases; the UV-Vis measurements indicate that the film obtained by powder deposition is of x-phase type whereas sublimation leads to an a-polymorph structure. The XAS results show that in the powder deposited film the molecules are mainly oriented parallel to the surface. This is opposite to the case of the vapor deposited film, where the molecules mainly are oriented orthogonal to the surface.},
  author       = {Alfredsson, Y and Ahlund, J and Nilson, K and Kjeldgaard, Lisbeth and O'Shea, JN and Theobald, J and Bao, Z and Martensson, N and Sandell, A and Puglia, C and Siegbahn, H},
  issn         = {0040-6090},
  keyword      = {spectroscopy,X-ray absorption,metal-free phthalocyanine,deposition process,X-ray photoemission spectroscopy},
  language     = {eng},
  number       = {1-2},
  pages        = {13--19},
  publisher    = {Elsevier},
  series       = {Thin Solid Films},
  title        = {Phase and molecular orientation in metal-free phthalocyanine films on conducting glass: Characterization of two deposition methods},
  url          = {http://dx.doi.org/10.1016/j.tsf.2005.05.012},
  volume       = {493},
  year         = {2005},
}