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- W1965730354 abstract "Very high charge-carrier drift mobilities have been measured in durene (1,2,4,5 tetramethyl benzene) single crystals by the transient-photoconductivity technique. In the crystal ($a, b$) plane both hole and electron mobilities are isotropic, 5 ${mathrm{cm}}^{2}$/V sec and 8 ${mathrm{cm}}^{2}$/V sec, respectively, at room temperature, and follow a ${T}^{ensuremath{-}2.5}$ temperature dependence. In the ${c}^{ensuremath{'}}$ direction only hole mobilities could be measured, which were 0.15 ${mathrm{cm}}^{2}$/V sec at room temperature and followed a ${T}^{ensuremath{-}2.8}$ temperature dependence. These results indicate that charge-carrier transport in durene can be treated within the frame of the band model. The charge-carrier generation process for the excitation wavelength (nitrogen laser $ensuremath{lambda}=3371$ AA{}) was also studied. It is shown that the process involves a direct two-photon absorption to produce singlet excitons which then dissociate at surface states giving charge carriers. A lower limit of ensuremath{sim}${10}^{ensuremath{-}48}$ ${mathrm{cm}}^{4}$ sec/(photon molecule) was estimated for the molecular singlet-singlet excitation-rate constant." @default.
- W1965730354 created "2016-06-24" @default.
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- W1965730354 date "1977-06-15" @default.
- W1965730354 modified "2023-09-24" @default.
- W1965730354 title "Temperature dependence and anisotropy of charge carrier mobilities in durene" @default.
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- W1965730354 doi "https://doi.org/10.1103/physrevb.15.5769" @default.
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