Figure 1
From: Magnetic field enhancement of organic photovoltaic cells performance
Simplified portrayal of a bulk nanostructure heterojunction P3HT(Poly(3-hexylthiophene-2,5-diyl)):PCBM solar cell, where incoming photons induce electronic transitions to a higher state of a π orbital in a monomer of –in this case– P3HT. Thus a Coulomb bound electron-hole pair is formed, from which the electron rapidly migrates to the interface of the polymer with the acceptor material (fullerene derivative PCBM here), whereupon charge separation takes place and a net photocurrent is created, leading ultimately to electricity generation.
