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Synthesis and characterization of three small band gap conjugated polymers for solar cell applications

Stefan Hellström (Institutionen för kemi- och bioteknik, Polymerteknologi) ; Lars J. Lindgren (Institutionen för kemi- och bioteknik, Polymerteknologi) ; Y. Zhou ; F. L. Zhang ; O. Inganas ; Mats R. Andersson (Institutionen för kemi- och bioteknik, Polymerteknologi)
Polymer Chemistry (1759-9954). Vol. 1 (2010), 8, p. 1272-1280.
[Artikel, refereegranskad vetenskaplig]

We report on a new series of small band gap conjugated polymers utilizing donor-acceptor-donor substructures in the polymer backbone to broaden and extend the optical absorption to longer wavelengths. Three polymers were prepared by Suzuki polymerization, using the same donor-acceptor-donor segment but with different comonomers. The goal was to investigate how the optical and electronic properties of the polymers were influenced by the different comonomers. Electrochemical spectroscopy, using square-wave voltammetry, shows that increasing the electron-donating strength of the comonomer will raise the HOMO energy level of the polymer, resulting in a decreased band gap. This result is also manifested by comparing open-circuit voltages from the corresponding laboratory fabricated solar cells. The best performing photovoltaic cell, based on APFO-Green15/[60]PCBM (1 : 4 w/w), reached a J(sc) of 4.2 mA cm(-2), a V-oc of 0.73 V, and a FF of 0.54, giving a PCE of 1.7%.

Nyckelord: alternating polyfluorene copolymers, energy-transfer processes, photovoltaic cells, donor, heterojunction, fluorene, devices, charge, photoluminescence, dissociation



Denna post skapades 2010-10-26. Senast ändrad 2016-12-05.
CPL Pubid: 128086

 

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Institutioner (Chalmers)

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

Ämnesområden

Kemi

Chalmers infrastruktur