Transport and photoconduction characteristics of metal-graphene-4H-SiC(0001) heterojunction devices

Hosseini, T.; Tomer, D.; Rajput, S.; Li, L.; Kouklin, N.
December 2014
Applied Physics Letters;12/1/2014, Vol. 105 Issue 22, p1
Academic Journal
Vertically integrated graphene-semiconductor systems remain of significant technological importance for their promise to captivate new device physics and propel the development of advanced carbon-based opto-electronic devices. In this study, we carry out a series of bias-dependent transport, gate-dependent transport, and photoconduction measurements to probe the opto-electronic characteristics of metal-graphene-4H-SiC (0001) (Si-face) heterojunctions. The forward bias transport is found to deviate strongly from thermionic emission one as being controlled by the device circuitry and minority carrier injection mechanisms. An improved analytical model is offered and used to extract key junction parameters including series resistance of ~80kΩ, interface barrier height of ~0.6eV, and ideality factor of ~6.1. The results of the photocurrent tests point to a light-assisted minority carrier injection as a key mechanism behind the photoconductive gain obtained in the devices subject to a weak, sub-bandgap cw-excitation.


Related Articles

  • Charge transfer in the fullerene C60-few layer graphene system and the existence of negative photoconductivity. Bautista-Flores, C.; Sato-Berrú, R. Y.; Mendoza, D. // Applied Physics Letters;11/10/2014, Vol. 105 Issue 19, p1 

    The electrical conductance of few layer graphene during thermal evaporation of fullerene C60 as well as the conductance under illumination of this bilayer junction is reported. We obtained few layer graphene films by chemical vapor deposition technique, and then C60 was thermally evaporated on...

  • Imaging of nanoscale charge transport in bulk heterojunction solar cells. Hamadani, Behrang H.; Gergel-Hackett, Nadine; Haney, Paul M.; Zhitenev, Nikolai B. // Journal of Applied Physics;Jun2011, Vol. 109 Issue 12, p124501 

    We have studied the local charge transport properties of organic bulk heterojunction solar cells based on the blends of poly(3-hexylthiophene) and phenyl-C61-butyric acid methyl ester with a photoconductive atomic force microscope (PCAFM). We explore the role of morphology on transport of...

  • Enhanced graphene plasmon waveguiding in a layered graphene-metal structure. I-Tan Lin; Jia-Ming Liu // Applied Physics Letters;7/7/2014, Vol. 105 Issue 1, p1 

    this Letter, a graphene-based terahertz plasmonic waveguide is proposed. The proposed structure benefits from the enhanced confinement and increased attenuation length of graphene surface plasmon by placing the graphene sheet in proximity of metal layers. For a graphene-based slab waveguide, our...

  • Transient photocurrent and charge-transfer excitation bands in a tin-phthalocyanine (SnPc) polycrystalline film. Pan, Y.-L.; Chen, L.B.; Wang, Y.; Zhao, Y.Y.; Li, F.M.; Zhou, H.W.; Wagiki, A.; Yamashita, M.; Tako, T. // Applied Physics A: Materials Science & Processing;1997, Vol. 65 Issue 4/5, p425 

    The dependence upon applied voltage of the transient photoconductive response in the nanosecond region under various excitation light intensities in an aluminium/tin–phthalocyanine/indium–tin–oxide (Al/αSnPc/ITO) sandwich cell is reported. Charge-transfer excitons and...

  • Xerographic studies of charge trapping in layered organic photoconductors. Kanemitsu, Yoshihiko; Funada, Hiroshi; Imamura, Shunji // Journal of Applied Physics;5/1/1990, Vol. 67 Issue 9, p4152 

    Presents a study that investigated charge trapping in layered photoconductors using xerographic residual potential technique. Relation between negative residual potential and the thickness of the charge generation layer (CGL); Effect of charge-carrier generation and transport in the CGL on the...

  • Publisher's Note: 'Charge transfer equilibria in ambient-exposed epitaxial graphene on (000[formula]) 6 H-SiC' [J. Appl. Phys. 111, 113706 (2012)]. Sidorov, Anton N.; Gaskill, Kurt; Buongiorno Nardelli, Marco; Tedesco, Joseph L.; Myers-Ward, Rachel L.; Eddy, Charles R.; Jayasekera, Thushari; Wook Kim, Ki; Jayasingha, Ruwantha; Sherehiy, Andriy; Stallard, Robert; Sumanasekera, Gamini U. // Journal of Applied Physics;7/15/2012, Vol. 112 Issue 2, p029908 

    A correction to the article "Charge Transfer Equilibria in Ambient-Exposed Epitaxial Graphene on 6 H-Sic" that was published in a 2012 issue is presented.

  • Photoinduced doping in heterostructures of graphene and boron nitride. Ju, L.; Velasco, J.; Huang, E.; Kahn, S.; Nosiglia, C.; Tsai, Hsin-Zon; Yang, W.; Taniguchi, T.; Watanabe, K.; Zhang, Y.; Zhang, G.; Crommie, M.; Zettl, A.; Wang, F. // Nature Nanotechnology;May2014, Vol. 9 Issue 5, p348 

    The design of stacks of layered materials in which adjacent layers interact by van der Waals forces has enabled the combination of various two-dimensional crystals with different electrical, optical and mechanical properties as well as the emergence of novel physical phenomena and device...

  • Erasure of photorefractive gratings in barium titanate. Li, J.; Li, X. H.; Lu, F. Y.; Wang, H. F.; Yuan, S. Z.; Zhu, Y.; Wu, X. // Journal of Applied Physics;12/1/1994, Vol. 76 Issue 11, p7541 

    Presents an analytical solution of the light-induced decay of the photorefractive gratings from the charge transport equations with shallow and deep traps. Information on the light-induced grating erasure technique; Method used to measure decay rate under different erasing beam intensities;...

  • Origin of ‘‘residual’’ persistent photoconductivity in selectively doped GaAs/AlxGa1-xAs heterojunctions. Theis, T. N.; Wright, S. L. // Applied Physics Letters;5/19/1986, Vol. 48 Issue 20, p1374 

    We present experimental results which clearly separate the various physical mechanisms which cause persistent photoconductivity in GaAs/AlxGa1-xAs heterojunctions. For high Al mole fraction the major contribution is from the donor-related DX center. This contribution is eliminated by reducing...


Read the Article


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

Try another library?
Sign out of this library

Other Topics