New low band gap alternating polyfluorene copolymer-based photovoltaic cells
Artikel i vetenskaplig tidskrift, 2007

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)]

Författare

Wendimagegn Mammo

Chalmers, Kemi- och bioteknik, Polymerteknologi

Shimelis Admassie

Abay Gadisa

Fengling Zhang

Olle Inganaes

Mats Andersson

Chalmers, Kemi- och bioteknik, Polymerteknologi

Sol. Energy Mater. Sol. Cells FIELD Full Journal Title:Solar Energy Materials & Solar Cells

Vol. 91 1010-1018

Ämneskategorier

Polymerkemi