Synthesis and properties of novel methanofullerenes having ethylthienyl and/or n-pentyl group for photovoltaic cells

[2 + 1] Cycloaddition reactions of fullerene C60 based on diazo compounds

“…The next group of [60]PCBM derivatives synthesized by a similar technique and containing aromatic groups Ar on the one hand and alkyl groups Alk on the other, bound to the C 60 core through a cyclopropane ring, most of which were tested in organic solar elements, is presented in Scheme 29 , and the substituents are listed in Table 1 [ 117 – 140 ].…”

p-n interface stabilization of planar heterojunction organic photovoltaics by an ethyleneoxy side chain of methanofullerenes

“…We employed a thienyl group as one of the side chain of methanofullerene. Fullerene derivatives with a thienyl moiety have been used as an electron acceptor from a thiophene polymer donor such as poly(3hexylthiophene), P3HT, by Hammelen et al [32], and by our group [33] and others [34,35,36,37,38].…”

Synthesis of novel methanofullerenes spiro-coupled with the indolinone fragment and prospects of their use in light-absorbing layers of plastic solar cells

“…Nevertheless, such their advantages as lightness, flexibili ty, prognosticated cheapness, and simpler technologies of preparation form significant prerequisites for the develop ment of research in this area. 6-9 Devices, whose ac tive layers represent composites of poly(3 hexylthio phene) with 1 (3 methoxycarbonylpropyl) 1 phenyl [6,6] methanofullerene (system Р3НТ/[60]PCBM), are pioneers among plastic solar cells during the recent de cade. The efficiency of the first cells based on this com posite was 2.5-2.7%.…”

“…24 We detected an unusual effect in phosphorus containing methanofullerenes. An X ray diffraction analysis showed the intermolecular interaction of a lone electron pair of the O atom of the phosphoryl group with the electronic system of fullerene in a molecule of О,О diethyl [1´ phenyl(cyclopropa [1,9](C 60 I h ) [5,6] fulleren 1´ yl)] phosphonate. 25 Due to this effect, the phosphonate molecule, unlike all known phosphorylated methanofullerenes, does not decompose during accepting electrons, and photovoltaic cells based on its compos ite with Р3НТ have higher output characteristics of short circuit current and open circuit voltage than refer ences cells.…”

“…The spectra of methanofullerenes 1-6, as the spectra of С 60 and РСВМ, in the region from 200 to 350 nm exhibit two intense absorption bands characteris tic of π-π* transitions in aromatic systems. The visible spectral region contains narrow bands at 427-431 nm, which are characteristic of [6,6] closed monoadducts of fullerene, and broad bands at 500 and 690 nm. The posi tion of bands in the spectrum of methanofullerene 1 does not substantially change relatively to the spectrum of [60]РСВМ.…”