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- W2075251020 abstract "Transient charging in response to pulsed bias of copper phthalocyanine (CuPc) organic thin films on indium–tin–oxide (ITO) was investigated by charge transient spectroscopy (QTS) in situ under ultra-high vacuum conditions. The charge relaxation phenomena in response to a bias pulse are modelled in terms of dipolar effects, considering alternatively possible orientation of the dipoles (polarization) under an applied external electric field and capture of charge carriers in dipole-induced electron states. Assuming a Gaussian energetic distribution of the density of states (DOS) as a consequence of disorder, a simple formalism is derived to determine the width (variance) σd of the DOS from QTS data. The isothermal QTS response of single-layer Ag/CuPc/ITO samples provides evidence for dipolar effects in CuPc, an example of using the new formalism in practice. The dipole moment of the CuPc molecule proved to be too small for the assignment of the amount of transient charges to the reorientation of dipoles. The model of trapping of charge carriers at a Gaussian DOS induced by polar molecules in a non-polar solid has mediated an estimate of the fraction of polar molecules from the experimentally assessed variance σd of the Gaussian DOS. The resulting dependence of σd on the dipole moment is in striking coincidence with literature data related to other types of polar molecules in molecular glasses." @default.
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- W2075251020 date "2004-07-29" @default.
- W2075251020 modified "2023-09-23" @default.
- W2075251020 title "A time-domain analysis of dipolar effects in copper phthalocyanine thin films on indium–tin–oxide substrates" @default.
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- W2075251020 doi "https://doi.org/10.1088/0268-1242/19/9/001" @default.
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