Influence of the sensitizer adsorption mode on the open-circuit potential of dye-sensitized solar cells.
We report a combined experimental and theoretical study on the origin of the different open circuit potentials observed in dye-sensitized solar cells using Ru(II)-polypyridyl homoleptic and heteroleptic sensitizers. We have measured the photovoltaic data of different sensitizers and used DFT calculations to analyze the electronic structure of dye-sensitized TiO(2) nanoparticles. Heteroleptic sensitizers adsorb onto TiO(2) via a single bipyridine, leading to a TiO(2) conduction band downshift and overall reduction of the cell open circuit potential.
De Angelis
Filippo
F
Istituto CNR di Scienze e Tecnologie Molecolari (ISTM-CNR), c/o Dipartimento di Chimica, Università di Perugia, Via elce di Sotto 8, I-06213, Perugia, Italy. filippo@thch.unipg.it
Fantacci
Simona
S
Selloni
Annabella
A
Grätzel
Michael
M
Nazeeruddin
Mohammed K
MK
D000327:Adsorption; D004396:Coloring Agents / Q000737:chemistry* / Q000528:radiation effects; D003198:Computer Simulation; D011211:Electric Power Supplies; D004574:Electromagnetic Fields; D004867:Equipment Design; D019544:Equipment Failure Analysis; D008027:Light; D008956:Models, Chemical; D049329:Nanostructures / Q000737:chemistry* / Q000528:radiation effects; D036103:Nanotechnology / Q000295:instrumentation* / Q000379:methods; D014025:Titanium / Q000737:chemistry* / Q000528:radiation effects*; D014159:Transducers
D004396:Coloring Agents; C009495:titanium dioxide; D014025:Titanium