Browsing by Author "Graetzel, Michael"

Now showing 1 - 4 of 4

Enhanced light harvesting in mesoporous TiO(2)/P3HT hybrid solar cells using a porphyrin dye
(2011-01-01)
Moon, Soo-Jin
;
Baranoff, Etienne
;
Zakeeruddin, Shaik M.
;
Yeh, Chen-Yu
;
Diau, Eric Wei-Guang
We report panchromatic light harvesting in hybrid TiO(2)/P3HT photovoltaic devices using a porphyrin dye that complements the light absorption of P3HT. The high short circuit photocurrent (12.1 mA cm(-2)) obtained is found to be due, in part, to Forster resonance energy transfer from the P3HT to the dye.
Enhanced light harvesting in mesoporous TiO2/P3HT hybrid solar cells using a porphyrin dye
(2011-01-01)
Moon, Soo-Jin
;
Baranoff, Etienne
;
Zakeeruddin, Shaik M.
;
Yeh, Chen-Yu
;
Diau, Eric Wei-Guang
We report panchromatic light harvesting in hybrid TiO2/P3HT photovoltaic devices using a porphyrin dye that complements the light absorption of P3HT. The high short circuit photocurrent (12.1 mA cm(-2)) obtained is found to be due, in part, to Forster resonance energy transfer from the P3HT to the dye.
Highly Efficient Mesoscopic Dye-Sensitized Solar Cells Based on Donor-Acceptor-Substituted Porphyrins
(2010)
Bessho, Takeru
;
Zakeeruddin, Shaik M.
;
Yeh, Chen-Yu
;
Diau, Eric Wei-Guang
;
Graetzel, Michael
Porphyrin-Sensitized Solar Cells with Cobalt (II/III)-Based Redox Electrolyte Exceed 12 Percent Efficiency
(2011-11-04)
Yella, Aswani
;
Lee, Hsuan-Wei
;
Tsao, Hoi Nok
;
Yi, Chenyi
;
Chandiran, Aravind Kumar
The iodide/triiodide redox shuttle has limited the efficiencies accessible in dye-sensitized solar cells. Here, we report mesoscopic solar cells that incorporate a Co((II/III))tris(bipyridyl)-based redox electrolyte in conjunction with a custom synthesized donor-pi-bridge-acceptor zinc porphyrin dye as sensitizer (designated YD2-o-C8). The specific molecular design of YD2-o-C8 greatly retards the rate of interfacial back electron transfer from the conduction band of the nanocrystalline titanium dioxide film to the oxidized cobalt mediator, which enables attainment of strikingly high photovoltages approaching 1 volt. Because the YD2-o-C8 porphyrin harvests sunlight across the visible spectrum, large photocurrents are generated. Cosensitization of YD2-o-C8 with another organic dye further enhances the performance of the device, leading to a measured power conversion efficiency of 12.3% under simulated air mass 1.5 global sunlight.