Einstein Relation for Electrons in an Electric Field

1,5-Diiodocycloctane: a cyclane solvent additive that can extend the exciton diffusion length in thick film organic solar cells

“…This value was higher than those obtained for devices without additives (51 μs) and the DIO-processed device (55 μs), suggesting reduced trap density in the DICO-processed thick-film OSCs. The L D could also be obtained through the Einstein relation: 69 where μ is the charge-carrier mobility, k is the Boltzmann constant, and q is the elementary charge. The L D values for electrons and holes in the devices treated without additives and with DIO were calculated to be 225/246 and 293/347 nm, respectively, while improved L D values were obtained for the DICO-processed device (454/520 nm).…”