An Organic D-pi-A Dye for Record Efficiency Solid-State Sensitized Heterojunction Solar Cells
The high molar absorption coefficient organic D-pi-A dye C220 exhibits more than 6% certified electric power conversion efficiency at AM 1.5G solar irradiation (100 mW cm(-2)) in a solid-state dye sensitized solar cell using 2,2',7,7'-tetrakis(N,N-dimethoxyphenylamine)-9,9'-spirobi-fluorene (Spiro-MeOTAD) as the organic hole transporting material. This contributes to a new record (6.08% by NREL) for this type of sensitized heterojunction photovoltaic device. Efficient charge generation is proved by incident photon-to-current conversion efficiency spectra. Transient photovoltage and photocurrent decay measurements showed that the enhanced performance achieved with C220 partially stems from the high charge collection efficiency over a wide potential range.
Keywords: Solid-state dye-sensitized solar cells ; D-pi-A dye ; electron injection ; charge collection ; Ruthenium Sensitizers ; Electron-Transfer ; Tio2 Film ; Performance ; Recombination ; Semiconductor ; Absorptivity ; Transport
Record created on 2011-06-08, modified on 2016-08-09