Impedance spectroscopy study on transport properties of N,N′-diphenyl-N,N′-bis(1-naphthyl)-1,1′-biphenyl-4,4′-diamine

Xu, Yang; Tao, Yiwen; Zhang, H.J.; Chen, X.Z.; Cao, Guanghan; Xu, Zhinan; Li, H.Y.; Bao, Sheng; He, Pimo

doi:10.1016/j.physb.2005.01.472

Cited by 19 publications

(5 citation statements)

References 17 publications

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“…For many small-molecule organic semiconductor materials, the dielectric permittivity at optical frequencies is known from thin-film ellipsometry measurements [12][13][14][15][16][17][18][19][20][21][22][23][24][25][26], electron energy loss spectroscopy [27], and from theory using quantum-chemically calculated molecular polarizabilities and the Clausius-Mossotti relationship [28,29]. The relative dielectric constant at quasistatic conditions may be obtained from low-frequency capacitance-voltage (C-V) studies of sandwich-type devices [30][31][32][33][34][35][36][37][38][39]. In principle, the dielectric permittivity in the full frequency range of interest can be obtained by combining the results of f -dependent C-V measurements (dielectric spectroscopy [40]), terahertz, infrared, and optical spectroscopy measurements.…”

Section: Introductionmentioning

confidence: 99%

Vibrational mode contribution to the dielectric permittivity of disordered small-molecule organic semiconductors

Vries

Coehoorn

2020

Phys. Rev. Materials

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Section: Introductionmentioning

confidence: 99%

Vibrational mode contribution to the dielectric permittivity of disordered small-molecule organic semiconductors

Vries

Coehoorn

2020

Phys. Rev. Materials

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“…2(b), At higher frequencies the imaginary part of the impedance for different bias voltages merges together and shows linear dependence on frequency with a slope of À1 indicating that the device behaves like a pure capacitor and shows the characteristics of a disordered insulator. 15,16) At lower frequencies a gradual change is observed as the bias is increased.…”

Section: Resultsmentioning

confidence: 99%

“…This effect at higher frequencies is caused by the contact resistance in circuit. 16) We have calculated the effective conductivity eff from the equation…”

Section: Resultsmentioning

confidence: 99%

Charge Transport Study of 2,2',7,7'-Tetrakis(N,N-di-4-methoxyphenyl amino)-9,9'-spirobifluorene Using Impedance Spectroscopy

Rana¹,

Srivastava²,

Grover³

et al. 2011

Jpn. J. Appl. Phys.

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The conduction mechanism in 2,2',7,7'-tetrakis(N,N-di-4-methoxyphenyl amino)-9,9'-spirobifluoren (spiro-MeOTAD) has been studied by impedance spectroscopy (IS) by using indium tin oxide (ITO)/spiro-MeOTAD/gold (Au) hole only device. The device could be modelled by an equivalent parallel RC network with a low contact resistance R s in series, in which the bulk geometrical capacitance above resonance frequency of spiro-MeOTAD remains unchanged while the bulk resistance R p changes with bias voltage. Upon increasing the bias voltage the conductivity of deposited film has increased by one order of magnitude (i.e., from ∼10-9 to ∼10-8 Ω-1 cm-1) whereas the dielectric relaxation time (τ) decreased from 1.7 ×10-4 to 1.2 ×10-5 s. Capacitance spectra of hole-only spiro-MeOTAD devices indicate the validity of the Space charge limited current (SCLC) model with localised states distributed in energy and field-dependent mobility.

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“…Actually, as they explained that physical factors such as dielectric constants, mobility and HOMO (highest occupied molecular orbit) levels of the organic semiconductor compound play an important role in the fabrication of the enhancement-type vertical organic transistor [29]. In our cases, TPD has a dielectric constant 4.0-4.5 in the low-frequency region [30] but NPB has a dielectric constant $3.5 [31]. On the other hand, the HOMO levels of TPD and NPB are À5.4 eV [32] and À5.5 eV [33], respectively.…”

Section: Article In Pressmentioning

confidence: 91%

Vertical organic light-emitting transistors with an evaporated Al gate inserted between hole-transporting layers

Yang

et al. 2009

Journal of Luminescence

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Impedance spectroscopy study on transport properties of N,N′-diphenyl-N,N′-bis(1-naphthyl)-1,1′-biphenyl-4,4′-diamine

Cited by 19 publications

References 17 publications

Vibrational mode contribution to the dielectric permittivity of disordered small-molecule organic semiconductors

Vibrational mode contribution to the dielectric permittivity of disordered small-molecule organic semiconductors

Charge Transport Study of 2,2',7,7'-Tetrakis(N,N-di-4-methoxyphenyl amino)-9,9'-spirobifluorene Using Impedance Spectroscopy

Vertical organic light-emitting transistors with an evaporated Al gate inserted between hole-transporting layers

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