Electron transport in the organic small-molecule material BAlq — the role of correlated disorder and traps

Scaling theory for percolative charge transport in molecular semiconductors: Correlated versus uncorrelated energetic disorder

“…We must keep in mind here that there is an additional dependence on E r through the prefactor ω 0 ; see Eq. (4). If this prefactor is taken into account, the expected decrease of the mobility with increasing E r is found.…”

“…It has been shown through experimental current-voltage characteristics that, depending on the material, either uncorrelated or dipole-correlated energetic disorder is more appropriate. [4][5][6] For uncorrelated Gaussian energetic disorder and low carrier concentrations, the mobility μ was determined numerically by Bässler 7 using a Monte Carlo (MC) simulation of a single charge carrier on a simple cubic (SC) lattice with Miller-Abrahams (MA) hopping rates. 8 The low carrierconcentration case for dipole-correlated disorder has also been studied using both MC simulation 9,10 and a semianalytic method.…”

Monte Carlo study of charge transport in organic sandwich-type single-carrier devices: Effects of Coulomb interactions

“…On the other hand, a similar comparison of EGDM and ECDM modeling of current-voltage characteristics of hole-only devices of the molecule N,N -bis(1-naphthyl)-N,N -diphenyl-1,1 -biphenyl-4,4 -diamine (α-NPD) and of electron-only devices of the molecule bis(2-methyl-8-quinolinolato)(4-phenylphenolato) aluminum (BAlq) shows that the intersite distance as obtained from a fit with the ECDM modeling is more realistic than the one obtained with the EGDM modeling. 12,13 This work suggests that for the investigated polymers and small-molecule semiconductors the EGDM and the ECDM, respectively, are thus the best models to describe charge transport.…”

Phosphorescence emission from BAlq by forced intersystem crossing in a colloidal photonic crystal

“…The molecule studied, BAlq, is an organic molecule extensively used in organic light-emitting diodes (OLED) technology [12][13][14][15][16][17] and photodetectors [18]. BAlq is typically used as the hole blocking or electron transport layer in OLEDs due to its relative high HOMO (5.9 eV) [15] and high electron mobility [19]. It has a broad fluorescence band around 490 nm and no triplet emission is normally seen.…”