Morphology,
the spatial distribution of traps, interdomain connectivity,
and phase separation of the active layer play a critical role in the
performance of the bulk heterojunction (BHJ) organic solar cells (OSCs).
In this work, we utilize the hopping transport model to simulate the
effect of morphological and structural parameters on the diffusion
coefficient and efficiency of the polymer-fullerene BHJ solar cells. In BHJ solar cells there are two
distinct phases as electron transport material (acceptor) and hole
transport material (donor). Here we try to create an almost realistic
network containing P3HT polymer chains and PCBM clusters for simulating
the charge transport in the active layer. The blend ratio of P3HT:PCBM
polymers and alignment of these bicontinuous networks of active layer
are considered here as the morphological parameter affecting the cell
performance. The dependency of the charge transport on such morphological
parameters is obtained in this study by using Monte Carlo continues
time random walk simulations.