An amorphous mesophase generated by thermal annealing for high-performance organic photovoltaic devices.
Thermal annealing of a p-i-n organic photovoltaic device containing a crystalline benzoporphyrin donor and solvated crystals of a silylmethylfullerene acceptor increases the device performance at a temperature where partial desolvation of the acceptor produces an amorphous mesophase. This suggests that the mesophase improves the hierarchical ordering of the materials, that is, the morphology of the n-layer and the interfacial contact and, hence, the carrier generation efficiency at the donor-acceptor interface.
Department of Chemistry, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo, 113-0033, Japan.
Hideyuki
H
Tanaka
Yoko
Y
Abe
Yutaka
Y
Matsuo
Junya
J
Kawai
Iwao
I
Soga
Yoshiharu
Y
Sato
Eiichi
E
Nakamura
D011211:Electric Power Supplies; D037741:Fullerenes / Q000737:chemistry*; D012997:Solvents / Q000737:chemistry; D013472:Sunlight; D013696:Temperature
D037741:Fullerenes; D012997:Solvents