The density of states in thin film copper phthalocyanine measured by Kelvin probe force microscopy

Celebi, K.; Jadhav, P. J.; Milaninia, K. M.; Bora, M.; Baldo, M. A.
August 2008
Applied Physics Letters;8/25/2008, Vol. 93 Issue 8, p083308
Academic Journal
The density of states (DOS) is an important factor in understanding charge transport in organic semiconductors. We use Kelvin probe force microscopy to find the DOS in thin films of copper phthalocyanine (CuPC). We find an exponential DOS with a characteristic energy of 0.11 eV over a 0.5 eV range of the highest occupied molecular orbital of CuPC. We also find that the technique is limited by charge trapping and hysteresis at low DOSs, and nonuniform potential profiles within the CuPC film at high DOSs.


Related Articles

  • Unoccupied electronic states in an organic semiconductor probed with x-ray spectroscopy and first-principles calculations. Molodtsova, Olga V.; Knupfer, Martin; Maslyuk, Volodymyr V.; Vyalikh, Denis V.; Zhilin, Victor M.; Ossipyan, Yurii A.; Bredow, Thomas; Mertig, Ingrid; Aristov, Victor Yu. // Journal of Chemical Physics;10/21/2008, Vol. 129 Issue 15, p154705 

    High-quality films of copper phthalocyanine (CuPc) prepared in situ were used as a model to characterize unoccupied states of organic molecular semiconductors. We demonstrate that a combination of high-resolution near-edge x-ray absorption together with first-principles calculations constitutes...

  • Bonding in d9 complexes derived from EPR: Application to CuCl2-4, CuBr2-4, and CdCl2:Cu2+. Aramburu, J. A.; Moreno, M. // Journal of Chemical Physics;12/15/1985, Vol. 83 Issue 12, p6071 

    In this work are reported the theoretical expressions for the [g], hyperfine, and superhyperfine (shf) tensors of a d9 square-planar complex within a molecular orbital (MO) scheme. These expressions include contributions arising from crystal field and charge transfer excitations calculated up to...

  • Morphology and properties of a hybrid organic-inorganic system: Al nanoparticles embedded into CuPc thin film. Molodtsova, O. V.; Aristova, I. M.; Babenkov, S. V.; Vilkov, O. V.; Aristov, V. Yu. // Journal of Applied Physics;2014, Vol. 115 Issue 16, p164310-1 

    The evolution of the morphology and the electronic structure of the hybrid organic-inorganic system composed of aluminum nanoparticles (NPs) distributed in an organic semiconductor matrix—copper phthalocyanine (CuPc)—as a function of nominal aluminum content was studied by...

  • Effect of Processing Parameters on Performance of Spray-Deposited Organic Thin-Film Transistors. Owen, Jack W.; Azarova, Natalia A.; Loth, Marsha A.; Paradinas, Markos; Coll, Mariona; Ocal, Carmen; Anthony, John E.; Jurchescu, Oana D. // Journal of Nanotechnology;2011, p1 

    The performance of organic thin-film transistors (OTFTs) is often strongly dependent on the fabrication procedure. In this study, we fabricate OTFTs of soluble small-molecule organic semiconductors by spray-deposition and explore the effect of processing parameters on film morphology and device...

  • Energy resolved electrochemical impedance spectroscopy for electronic structure mapping in organic semiconductors. Nádazdy, V.; Schauer, F.; Gmucová, K. // Applied Physics Letters;10/6/2014, Vol. 105 Issue 14, p1 

    We introduce an energy resolved electrochemical impedance spectroscopy method to map the electronic density of states (DOS) in organic semiconductor materials. The method consists in measurement of the charge transfer resistance of a semiconductor/electrolyte interface at a frequency where the...

  • Electronic structure of thin film iron-tetracyanoethylene: Fe(TCNE) x. Bhatt, Pramod; Carlegrim, E.; Kanciurzewska, A.; de Jong, M. P.; Fahlman, M. // Applied Physics A: Materials Science & Processing;Apr2009, Vol. 95 Issue 1, p131 

    Thin film iron-tetracyanoethylene Fe(TCNE) x, x∼2, as determined by photoelectron spectroscopy, was grown in situ under ultra-high vacuum conditions using a recently developed physical vapor deposition-based technique for fabrication of oxygen- and precursor-free organic-based molecular...

  • Orientation dependence of charge transfer for C60 on Cu(100). Daughton, D. R.; Gupta, J. A. // Applied Physics Letters;3/28/2011, Vol. 98 Issue 13, p133303 

    Scanning tunneling microscopy was used to characterize the lowest unoccupied molecular orbitals (LUMO), up to LUMO+3, of individual C60 molecules within monolayer films on Cu(100). On this surface C60 orients in four distinct configurations with respect to the substrate. Tunneling spectroscopy...

  • Charge transport and Kelvin Probe study of organic semiconductor hetero-junction. Kumar, Arvind; Samanta, Soumen; Singh, Ajay; Debnath, A. K.; Prasad, R.; Aswal, D. K.; Gupta, S. K. // AIP Conference Proceedings;6/25/2012, Vol. 1451 Issue 1, p286 

    We have synthesized organic hetero-junction comprising of n-type copper hexadecafluorophthalocyanine (F16CuPc) / p-type cobalt phthalocyanine (CoPc) using molecular beam epitaxy (MBE). The current - voltage (J-V) characteristics of hetero-junction are ohmic in the entire bias range (0-100 V),...

  • Tuning charge transport in solution-sheared organic semiconductors using lattice strain. Giri, Gaurav; Verploegen, Eric; Mannsfeld, Stefan C. B.; Atahan-Evrenk, Sule; Kim, Do Hwan; Lee, Sang Yoon; Becerril, Hector A.; Aspuru-Guzik, Alán; Toney, Michael F.; Bao, Zhenan // Nature;12/22/2011, Vol. 480 Issue 7378, p504 

    Circuits based on organic semiconductors are being actively explored for flexible, transparent and low-cost electronic applications. But to realize such applications, the charge carrier mobilities of solution-processed organic semiconductors must be improved. For inorganic semiconductors, a...


Read the Article


Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics