Diffusion-driven currents in organic-semiconductor diodes

Determining the Dielectric Constants of Organic Photovoltaic Materials Using Impedance Spectroscopy

“…To that end, we scan each sample with increasing reverse biases to ensure depletion of the active layer of charge carries. Even in the dark, charge carriers can diffuse into the film from the contacts . Figure A shows the reduction of the real impedance in the low‐frequency region, as a result of charge depletion from the active layer.…”

Theoretical modeling of charge transport in triphenylamine–benzimidazole based organic solids for their application as host-materials in phosphorescent OLEDs

“…For OLED devices, the trap assisted recombination current (or current density) enhances the light emission efficiency via ideality factor. 20,22,55 In such a way, we can adjust the trap assisted recombination process in the dynamically disordered organic systems with the aid of electric eld. In this study, we nd the intercrossing mechanism between coherent and incoherent transport in dynamically disordered systems while applying the electric eld.…”

“…18 In practice, the device performance will be enhanced by applied electric eld, at which the associated carrier current relies with the dri-diffusion. [19][20][21] In the present model, the hopping rate of hole and electron carriers is controlled by the site energy difference with the aid of applied electric eld. Importantly, we theoretically demonstrate the charge transport mechanism in dynamic disordered TBBI and TIBN derivatives at different electric eld situations.…”

“…In principle, the trap assisted recombination generally enhances the device performance and is characterized by the ideality factor. 20,22 The electric eld response current density is calculated for all molecules using our newly derived dri energycurrent density equation and also we have calculated the ideality factor by tting the Shockley diode current density equation. Based on the ideality factor values of all the systems, TBBI, Me-TBBI, TIBN and Me-TIBN molecular solids, the device performance is veried, and also the deviation as well as limitations of Einstein's classical diffusion-mobility relation is noted.…”

Impact of intentional photo-oxidation of a donor polymer and PC70BM on solar cell performance

“…The local ideality factor, n, was calculated from the dark J-V curves, in the range 0.3-1.1 V, according to: 36,37 n ¼ e kT…”