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New low band gap alternating polyfluorene copolymer-based photovoltaic cells

Wendimagegn Mammo (Institutionen för kemi- och bioteknik, Polymerteknologi) ; Shimelis Admassie ; Abay Gadisa ; Fengling Zhang ; Olle Inganaes ; Mats R. Andersson (Institutionen för kemi- och bioteknik, Polymerteknologi)
Sol. Energy Mater. Sol. Cells FIELD Full Journal Title:Solar Energy Materials & Solar Cells Vol. 91 (2007), 11, p. 1010-1018.
[Artikel, refereegranskad vetenskaplig]

New low band gap alternating polyfluorene copolymers were synthesized for use in plastic solar cells and their optical, electrochem., and photovoltaic characteristics were detd. These polymers incorporated fluorene units alternating with groups including electron-withdrawing (A) and electron-donating (D) groups in donor-acceptor-donor (DAD) sequence to achieve the lowering of band gaps. The HOMO-LUMO values were estd. from electrochem. studies. By varying the donor and acceptor strength and position of the solubilizing substituents, similar HOMO values were obtained. These values were also found to correlate well with the open circuit voltage (VOC) values detd. from photovoltaic data of the polymers blended with the acceptor PCBM. Despite similar HOMO values, the absorption spectra of the polymers differ significantly. This prompted the prepn. of photovoltaic devices consisting of blends of two polymers with complementary absorptions in combination with PCBM to harvest more photons in the polymer solar cells. [on SciFinder (R)]



Denna post skapades 2008-01-15. Senast ändrad 2008-01-21.
CPL Pubid: 66834

 

Institutioner (Chalmers)

Institutionen för kemi- och bioteknik, Polymerteknologi (2005-2014)

Ämnesområden

Polymerkemi

Chalmers infrastruktur