Materials for Flexible Organic Photovoltaic Cells: Conjugated Polymer MEH‐PPV/Fullerene Composites

Abstract

A series of azahomofullerenes and poly(amino)fullerenes were synthesized. Photoluminescence (PL) and photovoltaic (PV) measurements were performed on the composite films of conjugated polymer MEH-PPV with fullerene derivatives to investigate the influence of an electron acceptor on the charge-transfer process between components of PV system. We found that the PL of MEH-PPV is strongly quenched by the admixture of the fullerene derivative. The efficiency in the PV device containing the blend MEH-PPV/azahomofullerene is two orders of magnitude higher than in pure MEH-PPV.

Fullerenes

“…173 A series of azahomofullerenes and poly(amino)fullerenes have been synthesized and their photoluminescence and photovoltaic measurements have been investigated. 174 Three brominated mono-methano [60]fullerene malonate derivative polyads have been investigated for intra-and inter-molecular heavy-atom effects on their fluorescence properties. 175 A new C 84 adduct, ([84]PCBM), has been obtained as a mixture of three major isomers via a diazoalkane addition reaction and tested in a bulk heterojunction solar cell as the first C 84 derivative to be applied in device fabrication.…”

Evolution of the Bipolaronic Structure in Going From One- to Two-Dimensional π Model Systems

“…The latter are correlated to the nature of their π-electron system, which consists of electrons of the sp 2 -hybridized C atoms, described by the p z orbitals whose mutual overlap gives rise to a manifold of π molecular orbitals delocalized over the entire molecular backbone. In particular, the semiconducting properties of the conjugated polymers/oligomers, combined with their peculiar technological processability, make them a new generation of materials suitable for a wide range of optoelectronic, electronic, and, more recently, biotechnological applications . For these reasons, this class of materials is still now a testing bench for theoretical and experimental studies aimed to better understand, control, and design their physicochemical properties.…”