Michael Graetzel (Ecole Polytechnique Federale de Lausanne, Switzerland)
The interview of Czech Radio CRO3 VLTAVA with professor Graetzel (broadcast - July 7, 2008)
Part I of the interview of Czech Radio LEONARDO with professor Graetzel (broadcast - June 12, 2008)
Part II of the interview of Czech Radio LEONARDO with professor Graetzel (broadcast - June 12, 2008)
"Mesoscopic Electrodes for Generation and Storage of Electric Power from Sunlight"
The lecture covers our recent research on mesoscopic electrodes that made up of a network of nanometer-sized particles such as titanium dioxide, zinc oxide, tungsten trioxide, Fe2O3 or LiMnPO4. The pores between the particles are filled with an electrolyte or p-type semiconductor, in this way interpenetrating bicontinuous network composites are formed which are phase-separated by a hetero-junction. Electrons can percolate rapidly across the network of nanoparticles allowing the huge junction area to be addressed electronically. Intriguingly, cross surface electron and hole transfer in self-assembled monolayers (SAM) of redox-active molecules has also been observed. These mesoscopic oxide electrodes show great promise for a number of applications, such as high power lithium insertion batteries photo-electrochemical cells for solar hydrogen generation and dye-sensitized solar cells (DSCs). The DSC achieves currently a conversion efficiency of over 11 percent and exhibits excellent long term stability, rendering it a credible alternative to conventional silicon based devices. These new cells offers opportunities for applications in building integrated photovoltaic device and light weight solar power supplies. Recently large-scale production of flexible DSC modules has started.
1) B. Oâ€™Regan and M. Graetzel, â€śA Low Cost, High Efficiency Solar Cell" Nature, London, 353, 737 (1991).
2) U. Bach, D. Lupo, P. Comte, J. E. Moser, F. WeissĂ¶rtel, J. Salbeck, H. Spreitzert and M. Graetzel, â€śSolid State Dye Sensitized Cell Showing High Photon to Current Conversion Efficienciesâ€ť Nature 395, 550 (1998).
3) M. Graetzel, â€śPhotoelectrochemical Cells " Nature, London, 414, 338, 2001.
Professor M. Graetzel
Laboratory of Photonics and Interfaces,
Ecole Polytechnique FĂ©dĂ©rale de Lausanne
CH-1015 Lausanne Switzerland
June 5, 2008
Photos: Archive JHI - K.StejskalovĂˇ.