Assistance of partially reduced MoO3 interlayer to hole-injection at iron phthalocyanine/ITO interface evidenced by photoemission study

Liu, L.Y.; Wan, Li; Cao, Liang; Han, Yong; Zhang, W.H.; Chen, T.X.; Guo, Panpan; Wang, K.; Xu, F.

doi:10.1016/j.apsusc.2013.01.200

Cited by 12 publications

(13 citation statements)

References 41 publications

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“…More detailed descriptions of the beamline and endstation can be found elsewhere. 31,32 The TiO 2 (110) wafer (supplied by KMT Ltd., China) was cleaned using repeated cycles of Ar + sputtering and annealing at 900 K in the UHV system, yielding a clean and lightly reduced TiO 2 (110)-(1 × 1) surface with sharp LEED pattern. TPA (99%, Sigma-Aldrich Chemie GmbH, Germany) was thoroughly degassed for several hours before sublimated onto the TiO 2 (110) substrate from a resistively heated Knudsen cell.…”

Section: Methodsmentioning

confidence: 99%

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A Photoelectron Spectroscopy Study on the Interfacial Chemistry and Electronic Structure of Terephthalic Acid Adsorption on TiO₂(110)-(1×1) Surface

et al. 2013

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The chemical bonding mechanism, electronic structure, and the energy level alignment at the terephthalic acid (TPA)/TiO2 (110)-(1×1) interface were investigated in situ by means of X-ray photoelectron spectroscopy (XPS) and synchrotron radiation photoemission spectroscopy (SRPES). It has been found that the adsorption of TPA on TiO2(110)-(1×1) at room temperature leads to the formation of dicarboxylate species at lower coverage (∼0.2 ML) followed by the formation of monocarboxylate species below 1 ML, indicating a geometry variation from flat-lying to upright adsorption. Further deposition of TPA onto the first monolayer results in a multilayer growth without deprotonation. The energy level alignment at the TPA/TiO2 (110) interface demonstrates a straddling lineup of the organic frontier molecular levels with respect to the oxide bands at the interface. A large energy difference with a value of ∼1.1 eV is present between the lowest unoccupied molecular orbital (LUMO) of TPA and the conduction band (CB) of TiO2, suggesting an energetically favorable electron transfer from TPA into TiO2. Fundamental understanding of the chemical interactions and electronic properties at the TPA/TiO2 interface could facilitate unravelling the microscopic mechanism for interfacial charge transfer dynamics, which is desirable for exploring a new generation of hybrid energy devices.

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Section: Methodsmentioning

confidence: 99%

“…The analysis chamber is equipped with a VG angle-resolved electron energy analyzer (ARUPS-10), a Mg/Al twin-anode X-ray source, and a VG retractable four-grid LEED system. More detailed descriptions of the beamline and endstation can be found elsewhere. , …”

Section: Methodsmentioning

confidence: 99%

A Photoelectron Spectroscopy Study on the Interfacial Chemistry and Electronic Structure of Terephthalic Acid Adsorption on TiO₂(110)-(1×1) Surface

et al. 2013

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“…[25][26][27][28][29][30][31][32][33][34][35][36][37][38] As a wide band gap material, the band gap of MoO 3 has been reported to be 2.9-3.0 eV. 25,39 Oxygen deficiency in stoichiometric MoO 3 leads to occupied defect states close to the conduction band minimum, making it an n-type semiconductor.…”

Section: Introductionmentioning

confidence: 98%

“…39 Thanks to its very high work function (6.8 eV), MoO 3 was widely used to modify the metal/organic interfaces, and a mechanism of hole injection via electron extraction has been proposed. [29][30][31][32][33][34][35][36][37][38][39] Furthermore, in contrast to some chemically active metals, MoO 3 is not expected to react with oxide semiconductors, thus it is an ideal choice for investigating interfacial electronic structures.…”

Section: Introductionmentioning

confidence: 99%

Evolution of the SrTiO₃–MoO₃ Interface Electronic Structure: An in Situ Photoelectron Spectroscopy Study

Peng

Mao

et al. 2015

ACS Appl. Mater. Interfaces

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Modifying the surface energetics, particularly the work function of advanced materials, is of critical importance for a wide range of surface- and interface-based devices. In this work, using in situ photoelectron spectroscopy, we investigated the evolution of electronic structure at the SrTiO3 surface during the growth of ultra-thin MoO3 layers. Because of the large work function difference between SrTiO3 and MoO3, the energy band alignment on the SrTiO3 surface is significantly modified. The charge transfer and dipole formation at the SrTiO3-MoO3 interface leads to a large modulation of work function and to apparent doping in SrTiO3. The measured evolutions of electronic structure and upward band bending suggest that the growth of ultra-thin MoO3 layers is a powerful tool with which to modulate the surface energetics of SrTiO3, and this surface engineering approach could be generalized to other functional oxides.

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“…The peak responsible for carbonnitrogen stretching and bending occurs at 1332 ± 4 cm −1 . The peaks located at 1164 ± 2, 1117 ± 2 and 753 ± 2 cm −1 are due to the interaction of carbon atoms with the peripheral-ring hydrogen atoms [8][9][10]. As mentioned above, spin coating and annealing were carried out to produce the thin films.…”

Section: Phthalocyanines and Some Current Applicationsmentioning

confidence: 99%

Preparation and Structural Characterization of Metallophthalocyanine Particles Embedded in a Polymer Matrix

Sánchez-Vergara¹,

Ubeda²,

Ochoa³

et al. 2017

Phthalocyanines and Some Current Applications

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In this work, thin-film deposition of FePc particles nucleated and grown in gels was carried out in air by spin coating. The surface morphology and structure of these films were analysed by scanning electron microscopy (SEM) and Fourier transform infrared (FTIR) spectroscopy. The optical parameters have been investigated using spectrophotometric measurements of transmittance in the wavelength range of 200-1100 nm. The absorption spectra recorded in the UV-Vis region for the deposited samples showed a single band, namely the B or Soret band in the region between 285 and 305 nm. The dependence of the Tauc and Cody optical gaps associated with the thickness of the film was determined and found to be around 4.2 eV from direct transitions and 3.8 eV from non-direct transitions. The films' electric properties and their dependence in the presence of radiation of several wavelengths were evaluated. At lower voltages, ohmic conduction is evident, while space-charge limited conductivity (SCLC) governed by an exponential trap distribution is to be found at higher voltages.

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Assistance of partially reduced MoO3 interlayer to hole-injection at iron phthalocyanine/ITO interface evidenced by photoemission study

Cited by 12 publications

References 41 publications

A Photoelectron Spectroscopy Study on the Interfacial Chemistry and Electronic Structure of Terephthalic Acid Adsorption on TiO₂(110)-(1×1) Surface

A Photoelectron Spectroscopy Study on the Interfacial Chemistry and Electronic Structure of Terephthalic Acid Adsorption on TiO₂(110)-(1×1) Surface

Evolution of the SrTiO₃–MoO₃ Interface Electronic Structure: An in Situ Photoelectron Spectroscopy Study

Preparation and Structural Characterization of Metallophthalocyanine Particles Embedded in a Polymer Matrix

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Assistance of partially reduced MoO3 interlayer to hole-injection at iron phthalocyanine/ITO interface evidenced by photoemission study

Cited by 12 publications

References 41 publications

A Photoelectron Spectroscopy Study on the Interfacial Chemistry and Electronic Structure of Terephthalic Acid Adsorption on TiO2(110)-(1×1) Surface

A Photoelectron Spectroscopy Study on the Interfacial Chemistry and Electronic Structure of Terephthalic Acid Adsorption on TiO2(110)-(1×1) Surface

Evolution of the SrTiO3–MoO3 Interface Electronic Structure: An in Situ Photoelectron Spectroscopy Study

Preparation and Structural Characterization of Metallophthalocyanine Particles Embedded in a Polymer Matrix

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Resources

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A Photoelectron Spectroscopy Study on the Interfacial Chemistry and Electronic Structure of Terephthalic Acid Adsorption on TiO₂(110)-(1×1) Surface

A Photoelectron Spectroscopy Study on the Interfacial Chemistry and Electronic Structure of Terephthalic Acid Adsorption on TiO₂(110)-(1×1) Surface

Evolution of the SrTiO₃–MoO₃ Interface Electronic Structure: An in Situ Photoelectron Spectroscopy Study