This work was supported by the Industrial Technology Research Grant Program in '05 from the New Energy and Industrial Technology Development Organization (NEDO) of Japan (01B64002c) and a Grant-in-Aid for Scientific Research (15681005) of the Ministry of Education, Culture, Sports, Science and Technology of Japan.
Room-Temperature Synthesis of Porous Nanoparticulate TiO2 Films for Flexible Dye-Sensitized Solar Cells†
Article first published online: 4 MAY 2006
Copyright © 2006 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
Advanced Functional Materials
Volume 16, Issue 9, pages 1228–1234, June, 2006
How to Cite
Zhang, D., Yoshida, T., Oekermann, T., Furuta, K. and Minoura, H. (2006), Room-Temperature Synthesis of Porous Nanoparticulate TiO2 Films for Flexible Dye-Sensitized Solar Cells. Adv. Funct. Mater., 16: 1228–1234. doi: 10.1002/adfm.200500700
- Issue published online: 26 MAY 2006
- Article first published online: 4 MAY 2006
- Manuscript Accepted: 21 NOV 2005
- Manuscript Received: 5 OCT 2005
- Nanoparticles, inorganic;
- Solar cells, dye-sensitized;
- Titanium oxide
A novel room-temperature method for the preparation of porous TiO2 films with high performance in dye-sensitized solar cells (DSSCs) has been developed. In this method a small amount of TiIV tetraisopropoxide (TTIP) is added to an ethanolic paste of TiO2 nanoparticles, where it hydrolyzes in situ and connects the TiO2 particles to form a homogenous and mechanically stable film of up to 10 μm thickness without crack formation. Residual organics originating from the TTIP were removed by UV–ozone treatment of the films, leading to a remarkable improvement of the cell efficiency. Intensity-modulated photocurrent/voltage spectroscopy (IMPS/IMVS) showed that the main effect of the UV–ozone treatment is to suppress the recombination of photogenerated electrons, thereby extending their lifetime. The efficiency was further increased by preheating the TiO2 nanoparticles before the paste preparation to remove contaminants originating from the preparation process of the particles. Solar-to-electric energy conversion efficiencies of 4.00 and 3.27 % have been achieved for cells with conductive glass and plastic film substrates, respectively, under illumination with AM 1.5 (100 mW cm–2) simulated sunlight.