"The two types of material used are electron donor and acceptor material
, forming an interface wherein photo-induced electron transfer (PET) can occur from to donor to acceptor under visible light irradiation," Zang explained.
The absorber material, in essence, releases the electron to the acceptor material
oThis dark shadow state can be the most efficient source of two electrons via transfer to an electron acceptor material
, such as fullerene, which was used in the study.
Subsequently the electrons diffuse through the acceptor material
towards the cathode.
Among them, the most common devices are bulk-heterojunction (BHJ) polymer solar cells made upon blending an electron donor conjugated polymer with an electron acceptor material
such as fullerene derivatives [3-7].
Because the active layer formed interpenetrating networks with the acceptor material
, increasing the PEDOT:PSS roughness will connect these islands, forming an electronic transmission channel conducive to hole transmission 24].
Electron acceptor material
[C.sub.60] (purchased from Alfa Aesar) films and hole blocking material 4,7-diphenyl 1, 10-phenanthroline (Bphen, purchased from Jilin OLED Material Tech Co., Ltd) films were deposited by thermal evaporation under 4 x [10.sup.-4] Pa vacuum conditions successively.
(iv) Bulk heterojunction (BHJ) OSC systems, which are characterized by a high degree of interactions between donor and acceptor constituents due mainly to the high interfacial surface area between donor and acceptor materials
Herein, we report our efforts in exploring a new class of molecular acceptor materials
based on a well-known organic pigment core of quinacridone.
In a well-designed HPV, the donor and acceptor materials
must have suitably been aligned with energy bands that enable exciton dissociation and provide a high overall electrochemical potential.
We will show patterned thin films of organic photovoltaics relevant materials, including conductive silver used in cathodes, carbon nanotubes used as transparent conductors, conjugated polymers used in the active layer and quantum dots, band gap acceptor materials
that also function in non-white lights environments."