OF DOCTORAL DISSERTATION HELSINKI UNIVERSITY OF TECHNOLOGY P.O. BOX 1000, FI-02015 TKK http://www.tkk.fi Author Janne Halme Name of the dissertation Performance limiting factors in flexible dye solar cells Manuscript submitted 10.3.2009 Manuscript revised 11.5.2009 Date of the defence 1.6.2009 Monograph Article dissertation (summary + original articles) Faculty Faculty of Information and Natura...

We report on novel composite nanostructures based on boron-doped diamond thin films grown on top of TiO2 nanotubes. The nanostructures made of BDD-modified titania nanotubes showed an increase in activity and performance when used as electrodes in electrochemical environments. The BDD thin films (∼200-500 nm) were deposited using microwave plasma assisted chemical vapor deposition (MW PA CVD) o...

In this work, a facile method was adopted to prepare TiO2-WO3 loaded onto wood surface by two-step hydrothermal method. The as-prepared composite material can be used as photocatalyst under UV irradiation for the photodegradation of formaldehyde. Related tests showed that nano-architectonic materials with spherical particles substratewere mainly caused self-photodegradation nanostructured firml...

In this work, an anti-reflection coating was prepared in the region (400-1000) nm of wavelength, with a double layer silicon dioxide (SiO2) as inner and second mixture titanium (TiO2) certain ratios, outer using chemical spraying method number 6 sprays SiO2 12 - TiO2. Using deposited on glass substrate different SiO2, fixed TiO2-SiO2. The optical structural properties were determined UV-Vis spe...

Abstract Synthesized these novel structures PPy-MWCNTs/TiO2/Al2O3/p-Si and PPy-MWCNTs/TiO2/Al2O3/n- for using in manufactures diodes, sensor, supercapacitors, electronic devices. The effect of silicon substrate type on electrical dielectric parameters such as constant ɛ`, loss tangent tanδ, Cole –Cole diagram, the width depletion layer (Wd), barrier height (Φb), density state surface (NSS) seri...

We find that in a paramagnetic pyrene derivative of the nitronyl nitroxide radical deposited on rutile TiO2(110) single crystals the molecules keep/lose their paramagnetic character depending on the local substrate hydroxylation. The first molecular layer may act as a "buffer" on which intact organic magnets are grown.

The effect of titanium dioxide addition on bonding strength of CaO-P2O5 -Na 2O-TiO2glass-ceramic system was investigated as a coating on titanium substrate. Thus, different amounts of TiO2 (2, 3.5 and 5mol %) were added to the base glass batch composition. The prepared glaze slips were applied on the substrate by dip coating method, dried and then heat treated at various temperatures. After tha...

In this paper we used two free-metal organic dyes (dye 1 and dye 2) based on indigo and thioindigo with cyanoacrylic acid as the electron acceptor group. The proposed dyes were sensitized from naphalene as the starting material by standard reactions and characterized by different analytical techniques and UV-Visible spectroscopy after purification. Spectrophotometric measurements of the organic...