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Electrochemical aspects of display technology based on nanostructured titanium dioxide with attached viologen chromophores
KTH, School of Chemical Science and Engineering (CHE), Centres, Centre of Molecular Devices, CMD.
KTH, School of Chemical Science and Engineering (CHE), Centres, Centre of Molecular Devices, CMD.
2008 (English)In: Electrochimica Acta, ISSN 0013-4686, E-ISSN 1873-3859, Vol. 53, no 11, 4065-4071 p.Article in journal (Refereed) Published
Abstract [en]

Progress in recent years in the field of electrochromic displays based on viologen modified high-surface area TiO2 electrodes (Vio2+/TiO2) has moved the technology towards commercialisation. Viologen molecules (Vio2+), derivatised with phosphonic acid attachment groups can be chemisorbed on nanostructured TiO2 layers of thickness 2–10 μm. Characterisation by cyclic voltammetry, spectroelectrochemistry and impedance spectroscopy demonstrates that colourless Vio2+/TiO2 is reversibly reduced to the strongly coloured cation radical species Vio+/TiO2. This system can constitute the working electrode of an electrochromic display with a capacitive doped SnO2 electrode as counter electrode, the latter coated by an electrochemically inert white light-reflecting layer. Such a device is stable upon repeated colouration–bleaching cycles with a bleached-to-coloured state contrast ratio exceeding 5. Multicolour displays can be achieved by patterning different electrochromophores onto different areas of one working electrode.

Place, publisher, year, edition, pages
2008. Vol. 53, no 11, 4065-4071 p.
Keyword [en]
electrochromic display; nanostructured electrode; viologen; titanium dioxide; Nanochromics (TM)
National Category
Physical Chemistry
Identifiers
URN: urn:nbn:se:kth:diva-9855DOI: 10.1016/j.electacta.2007.10.011ISI: 000254728900043Scopus ID: 2-s2.0-39749134732OAI: oai:DiVA.org:kth-9855DiVA: diva2:134144
Note
QC 20100804Available from: 2009-01-19 Created: 2009-01-19 Last updated: 2017-12-14Bibliographically approved
In thesis
1. Charge Transport Processes in Mesoporous Photoelectrochemical Systems
Open this publication in new window or tab >>Charge Transport Processes in Mesoporous Photoelectrochemical Systems
2009 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

During the last decade, the dye sensitised solar cell (DSC) has attracted much attention. The technology has a potential to act as a new generation of photovoltaic device, it has also increased our knowledge within the field of photoelectrochemistry. The materials used in the DSC have been used in other technologies, such as electrochromic displays. This thesis examines how such systems can be analysed to understand their properties from their components. Both of the considered device technologies consist of a thin mesoporous semiconductor film immersed in an electrolyte. The study starts by investigating some of the fundamental properties of the mesoporous semiconductor and its interface with the electrolyte. This gives rise to the charge-voltage relationship for the devices, which is related to the chemical capacitance and electronic energy levels for the materials. In particular,special attention is given to the DSC and the properties of the charge carriers in the semiconductor. For the DSC, several techniques have been developed in order to understand the processes of transport and recombination for the charge carriers in the semiconductor film, which are vitally important for performance. In this thesis, particular focus is given to light modulation techniques and electrical analysis with impedance spectroscopy. The transportproperties show for both techniques a nonlinear behaviour, which is explained with the trapping model. The DSC solar cell is analysed in order to interpret the transport measurements for film thickness optimisation. DSC cells with new semiconductor materials, such as ZnO, were analysed with impedance measurements to provide new insights into the optimisation of the performance of the photoelectrochemical solar cell technology.

Place, publisher, year, edition, pages
Stockholm: KTH, 2009. x, 60 p.
Series
Trita-CHE-Report, ISSN 1654-1081 ; 2009:1
Keyword
solar cell, dye-sensitized, impedance, electron transport, mesoporous
National Category
Physical Chemistry
Identifiers
urn:nbn:se:kth:diva-9849 (URN)978-91-7415-209-8 (ISBN)
Public defence
2009-02-06, F3, KTH, Lindstedtsvägen 26, Stockholm, 10:00 (English)
Opponent
Supervisors
Note
QC 20100804Available from: 2009-01-19 Created: 2009-01-14 Last updated: 2010-08-04Bibliographically approved

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