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Phase and molecular orientation in H2Pc on conducting glass: characterization of two deposition methods
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics.
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics.
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics.
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2005 (English)In: Thin Solid Films, ISSN 0040-6090, E-ISSN 1879-2731, Vol. 493, no 1-2, 13-19 p.Article in journal (Refereed) Published
Abstract [en]

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 α-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.

Place, publisher, year, edition, pages
2005. Vol. 493, no 1-2, 13-19 p.
Keyword [en]
Metal-free phthalocyanine, Deposition process, X-ray absorption spectroscopy, X-ray photoemission spectroscopy
National Category
Physical Sciences
URN: urn:nbn:se:uu:diva-75981DOI: 10.1016/j.tsf.2005.05.012ISI: 000233150700003OAI: oai:DiVA.org:uu-75981DiVA: diva2:103892
Available from: 2006-02-22 Created: 2006-02-22 Last updated: 2013-05-21Bibliographically approved
In thesis
1. Electronic and Structural Properties of Thin Films of Phthalocyanines and Titanium Dioxide
Open this publication in new window or tab >>Electronic and Structural Properties of Thin Films of Phthalocyanines and Titanium Dioxide
2005 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

This thesis is based on experimental studies in chemical physics. Titanium dioxide (TiO2) and phthalocyanine’s (Pc’s), interesting in many future perspectives, have been deposited as thin films and studied as follows. Information has been obtained on e.g. molecular orientation, crystal structure, depth profile of the chemical composition, electrochemical properties and electronic structure. This has been achieved by means of a combination of techniques: X-ray photoelectron spectroscopy (XPS), near edge x-ray absorption fine structure (NEXAFS), density functional theory calculations (DFT), UV-visible absorption spectroscopy (UVVIS) and cyclic voltammetry (CV).

Metal-free phthalcyanine (H2Pc) has been shown to form films with different crystal structure and molecular orientation depending on deposition method, evaporation/sublimation or powder deposition, on commercial conducting glass (fluorine doped tin oxide, FTO), which is used e.g. in solar cells and organic light emitting devices (OLEDs). The unoccupied molecular orbitals are divided in x, y and z space coordinates of the molecule and also divided in inequivalent nitrogen components.

The electronic structure is also studied for a sublimated titanyl phthalocyanine (TiOPc) film and related to the metal-free phthalocyanine. The ligand field around the titanium atom in TiOPc is compared with that of TiO2 to delineate the unoccupied levels recorded by means of x-ray absorption spectroscopy.

Nanostructured TiO2 films were manufactured by screen printing/doctor blading on FTO. Such films were additionally covered with lutetium diphthalocyanine (LuPc2) by means of surface assembly from solution. LuPc2-, LuPc2+ and LuPc2H were identified and the stability of the electrochromic reactions in this system was monitored.

Chemical vapor deposition (CVD) has been used to grow nanometer sized anatase TiO2 crystals on pre-oxidized Si (111) without formation of interfacial carbon and with an interface layer of the size of 15- 25Å. The interface layer was found to be amorphous TiSixOy with graded stoichiometry.

Place, publisher, year, edition, pages
Uppsala: Acta Universitatis Upsaliensis, 2005. 51 p.
Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology, ISSN 1651-6214 ; 16
Physics, photoelectron spectroscopy, x-ray absorption spectroscopy, phthalocyanine, titanium dioxide, electronic structure, electrochromic reactions, thin films, chemical vapor deposition, evaporation, Fysik
National Category
Physical Sciences
urn:nbn:se:uu:diva-4802 (URN)91-554-6155-7 (ISBN)
Public defence
2005-03-18, Häggsalen, Ångströmlaboratoriet, Lägerhyddsvägen 1, Uppsala, 10:15
Available from: 2005-02-25 Created: 2005-02-25 Last updated: 2013-05-21Bibliographically approved

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Åhlund, JohnNilson, KatharinaBao, ZhuoMårtensson, NilsSandell, AndersPuglia, CarlaSiegbahn, Hans
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