Romanova, I.P., Bogdanov, A.V. , Izdelieva, I.A., Trukhanov, V.A., Shaikhutdinova, G.R., Yakhvarov, D.G., Latypov, S.K., Mironov, V.F., Dyakov, V.A., Golovnin, I.V., Paraschuk, D.Y., Sinyashin, O.G.
An easy, high-yield and atom-economic procedure of a C60 fullerene modification using a reaction of fullerene C60with N-alkylisatins in the presence of tris(diethylamino)phosphine to form novel long-chain alkylindolinone-substituted methanofullerenes (AIMs) is described. Optical absorption, electrochemical properties and solubility of AIMs were studied. Poly(3-hexylthiophene-2,5-diyl) (P3HT)/AIMs solar cells were fabricated and the effect of the AIM alkyl chain length and the P3HT:AIM ratio on the solar cell performance was studied. The power conversion efficiencies of about 2% were measured in the P3HT/AIM devices with 1:0.4 P3HT:AIM weight ratio for the AIMs with hexadecyl and dodecyl substituents. From the optical and AFM data, we suggested that the AIMs, in contrast to [6,6]-phenyl-C61-butyric acid methyl ester (PCBM), do not disturb the P3HT crystalline domains. Moreover, the more soluble AIMs do not show a better miscibility with the P3HT crystalline phase.
Beilstein Journal of Organic Chemistry, Volume 10, 14 May 2014, Pages 1121-1128