Robert Johanson

     Robert Johanson  Ph.D.

    Associate Professor of Electrical and Computer Engineering
    Head, Department of Electrical and Computer Engineering

    Biography

    Publications

    Selected Journal Papers

    [26] R.E. Johanson, M. Kowalshyn, D.DeForrest, K. Shimakawa and S.O. Kasap, 2007, "The kinetics of photo-induced dichroism in thin films of amorphous arsenic triselenide", Journal of Materials Science: Mater. Electron., Vol. 18, pp. S127-S130. (Special issue for the International Conference on Optical and Optoelectronic Properties of Materials and Applications, Darwin, Australia, July 2006)
    [25] W. Tan, R.E. Johanson, K. Koughia and S.O. Kasap, 2007, "Optical Properties of Vacuum Deposited and Chlorine Doped a-Se Thin Films: Aging Effects", Journal of Materials Science: Mater. Electron., Vol. 18, pp. S429-S433. (Special issue for the International Conference on Optical and Optoelectronic Properties, Darwin, Australia, July 2006)
    [24] S. Majid and R.E. Johanson, 2006. "1/f Conductance noise in stabilized amorphous selenium", Journal of Non-Crystalline Solids, 352, 1574-1577.
    [23] B. Fogal, M. Z. Kabir, S. K. O'Leary, R. E. Johanson and S.O. Kasap, 2004, "X-ray-induced recombination effects in a-Se-based x-ray photoconductors used in direct conversion x-ray sensors", Journal of Vacuum Science and Technology A: Vacuum, Surfaces and Films, 22, 1005-1009.
    [22] K.V. Koughia, B. Fogal, G. Belev, R.E. Johanson and S.O. Kasap, 2004, "Density of states in the mobility gap of stabilized a-Se from electron time-of-flight photocurrent analysis", Journal of Non-Crystalline Solids, 338-340, 569-573.
    [21] S.O. Kasap, B. Fogal, M. Z. Kabir, R. E. Johanson and S. K. O'Leary, 2004, "Recombination of drifting holes with trapped electrons in stabilized a-Se photoconductors: Langevin recombination", Applied Physics Letters, 84, 1991-1993.
    [20] A.R. Smith and R.E. Johanson, 2004, "62nd annual Saskatchewan Christmas bird count 2003", Blue Jay Vol. 62, pp. 2-26.
    [19] A.R. Smith and R.E. Johanson, 2003. "61st Annual Saskatchewan Christmas Bird Count - 2002", Blue Jay, Vol. 61, pp. 2-26.
    [18] R.E. Johanson, M. Gunes and S.O. Kasap, 2003, "1/f noise in hydrogenated amorphous silicon-germanium alloys", IEE Circuits, Devices and Systems, 150 (4), 345-349.
    [17] E.V. Emelianova, N. Qamhieh, M. Brinza, G.J. Adriaenssens, S.O. Kasap, R.E. Johanson and V.I. Arkhipov, 2003, "Defect levels and charge carrier photogeneration in amorphous selenium layers", J. of Non-Cryst. Solids, 326-327, 215-219.
    [16] S.O. Kasap, M. Gunes, R.E. Johanson, Q. Wang, J. Yang and S. Guha, 2003, "Conductance fluctuations in a-Si:H: effects of alloying and device structure", J. of Materials Science: Materials in Electronics, 14, 693-696.
    [15] G.S. Belev, B. Fogal, K.V. Koughia, R.E. Johanson and S.O. Kasap, 2003, "Dependence of charge carrier ranges in stabilized a-se on preparation conditions and alloying", J. of Materials Science: Materials in Electronics, 14, 841-843.
    [14] M. Gunes, R.E. Johanson, S.O. Kasap, F. Finger and A. Lambertz, 2003, "Conductance fluctuations in VHF-PECVD grown hydrogenated microcrystalline silicon thin films", J. of Materials Science: Materials in Electronics, 14, 731-733.
    [13] S.O. Kasap, K.V. Koughia, B. Fogal, G. Belev, R.E. Johanson, 2003. "The Influence of Deposition and Alloying on the Electronic Properties of Amorphous Selenium", Semiconductors, Vol 37 (7), pp. 816-821.
    [12] B. Fogal, R.E. Johanson, G. Belev, S. O'Leary, and S.O. Kasap, 2002. "X-Ray Induced Effects in Stabilized a-Se X-ray Photoconductors", Journal of Non-Crystalline Solids (Elsevier), Vol. 299-302, pp. 993-997.
    [11] D. Tonchev, B. Fogal, G. Belev, R.E. Johanson, and S.O. Kasap, 2002. "Properties of a-SbxSe1-x Photoconductors", Journal of Non-Crystalline Solids (Elsevier), Vol. 299-302, pp. 998-1001.
    [10] S.O. Kasap, J. Rowlands, B. Fogal, M. Z. Kabir, G. Belev, N. Sidhu, B. Polischuk, R.E. Johanson, 2002. "Progress in Science and Technology of Direct Conversion a-Se X-ray Sensors", Journal of Non-Crystalline Solids (Elsevier), Vol. 299-302, pp. 988-992.
    [9] M. G-nes, R.E. Johanson, S.O. Kasap, J.C. Yang, and S. Guha, 2002. "Conductance Fluctuations in Undoped Hydrogenated Amorphous Silicon-Germanium Alloy Thin Films", Journal of Non-Crystalline Solids (Elsevier), Vol. 299-302, pp. 425-429.
    [8] R.E. Johanson, M. Gunes, and S.O. Kasap, 2002. "Noise in Hydrogenated Amorphous Silicon", IEE Proceedings - Circuits, Devices and Systems (IEE), Vol. 149, pp. 68-74. (invited)
    [7] R.E. Johanson and S.O, Kasap, 2002. "1/f Noise of Amorphous Indium Oxide", Journal of Vacuum Science and Technology A (American Institue of Physics), Vol. 20, pp. 1027-1029.
    [6] R.E. Johanson and S.O. Kasap, 2000. "1/f Noise in p-Type Amorphous Silicon", Journal of Vacuum Science and Technology A (American Institue of Physics), Vol. 18, pp. 661-664.
    [5] R.E. Johanson, M. Gunes, and S.O. Kasap, 2000. "1/f Noise in Doped and Undoped Amorphous Silicon", Journal of Non-Crystalline Solids (Elsevier), Vol. 266-269, pp. 242-246.
    [4] M. Gunes, R.E. Johanson, and S.O. Kasap, 2000. "Conductance Fluctuations in Undoped Intrinsic Hydrogenated Amorphous Silicon Films Prepared Using Different Disposition Techniques", Journal of Non-Crystalline Solids (Elsevier), Vol. 266-269, pp. 304-308.
    [3] M. Gunes, R.E. Johanson, and S.O. Kasap, 1999. "1/f Noise Study of Undoped Intrinsic Hydrogenated Amorphous Silicon Thin Films", Physical Review B (American Physical Society), Vol. 60, pp. 1477-1479.
    [2] R.E. Johanson, D. Scansen, and S.O. Kasap, 1999. "Effect of Light Exposure on 1/f Noise in a-Si:H", Journal of Vacuum Science and Technology B (American Institue of Physics), Vol. 17, pp. 73-76.
    [1] R.E. Johanson, S.O. Kasap, J. Rowlands, and B. Polischuk, 1998. "Metallic Electrical Contacts to Stabilized Amorphous Selenium for Use in X-Ray Image Detectors", Journal of Non-Crystalline Solids (Elsevier), Vol. 227-230, pp 1359-1362.

    Conference Publications

    [7] Daniel DeForrest, Robert E. Johanson and Safa O. Kasap, 2005, "PHOTOINDUCED DICHROISM IN THIN FILMS OF AMORPHOUS As2Se3", Proceedings of IEEE Canadian Conference on Electrical and Computer Engineering, May 1-4, Saskatoon, Canada, pp. 1551-1553. [PDF]
    [6] Kanghyun Kim and Robert E. Johanson, 2005, "LOW FREQUENCY NOISE IN AMORPHOUS SILICON THIN-FILM TRANSISTORS", Proceedings of IEEE Canadian Conference on Electrical and Computer Engineering, May 1-4, Saskatoon, Canada, pp. 2261-2263. [PDF]
    [5] Shaikh Hasibul Majid and Robert E. Johanson, 2005, "1/f NOISE IN AN AMORPHOUS SELENIUM PHOTO-DETECTOR", Proceedings of IEEE Canadian Conference on Electrical and Computer Engineering, May 1-4, Saskatoon, Canada, pp. 2264-2267. [PDF]
    [4] R.E. Johanson, M. Gunes, and S.O. Kasap, 2003. "1/f Noise in Amorphous Silicon and Silicon-Germanium Alloys", Fluctuations and Noise 2003, Sante Fe, NM, June, Proceedings of the SPIE Vol. 5112, ed. M.B. Weissman, N.E. Israeloff, and A.S. Kogan, pp. 61-66 (Invited Paper).
    [3] M. G"nes, R.E. Johanson, S.O. Kasap, J.C. Yang and S. Guha, 2001. "1/f Noise in Undoped Hydrogenated a-Si and a-Si:Ge Alloys", in The Proceedings of the 16th International Conference on Noise in Physical Systems and 1/f Noise Fluctuations, Gainsville, Florida, October 2001 (World Scientific Publishing Co.), pp. 85-90. (Invited Paper)
    [2] R.E. Johanson, M. G"nes, S.O. Kasap, 2000. "Conductance Fluctuations in Hydrogenated Amorphous Silicon", in Materials for Information Technology in the New Millenium: The Proceedings of the 11th International School in Condensed Matter Physics, Varna, Bulgaria September 2000, eds. J.M. Marshall, A.G. Petrov, A. Vavrek, D. Nesheva, D. Dimova-Malinovska, and J.M. Maud, pp. 118-125. (invited)
    [1] M. G"nes, R.E. Johanson, and S.O. Kasap, 1999. "Coplanar Conductance Fluctutations in Undoped Intrinsic Hydrogenated Amorphous Silicon Thin Films, in Thin Film Materials and Devices"Developments in Science and Technology. The Proceedings of the 10th International School in Condensed Matter Physics, Varna, Bulgaria September 1998 (World Scientific Publishing Co.) pp. 233-236. (invited)

    Books / Chapters in Books

    [1] H. Ugur, R. Johanson, and H. Frtizsche, 1985. �Effective Medium Expression for the Optical Properties of Periodic Multilayer Films�, in Tetrahedrally-Bonded Amorphous Semiconductors, Plenum, 1985.

    Honours and Awards

    NSERC International Postdoctoral Fellowship, 1993

    Research Grants

    Graduate Students

    Shaikh Hasibul Majid
    George Belev
    (co-supervised with Professor Kasap)

    Visit his personal hompage at:
    http://homepage.usask.ca/~gsb808/
    Kang-Hyun Kim
    (co-supervised with Professor Kasap)
    Dan DeForrest
    (co-supervised with Professor Kasap)

    Visit his personal homepage at:
    http://homepage.usask.ca/~dbd335/
    Yang Xu
    (co-supervised with Professor Kasap)
    Wee Tan
    (co-supervised with Professor Kasap)

    Teaching

    EE301
    Electricity, Magnetism and Fields

    Review of vector calculus, static electric and magnetic field theory and its extension into time varying E and M fields, interaction between fields and materials, transmission line, wave guide and antenna fields.

    http://www.engr.usask.ca/classes/EE/301/
    EE372
    Electronics Devices

    Quantum physics, Schrödinger's equation, quantized energy levels, quantum numbers, photons, bonding, energy bands, electron statistics, semiconductor basics, extrinsic semiconductors, pn junction, pn junction characteristics and models, bipolar junction transistor (BJT), junction field effect transistor (JFET), metal-oxide-semiconductor transistor (MOST), enhancement and depletion MOSFETs, BJT, JFET and MOS transistor equations, biasing, amplifier circuits and small signal parameters and models.

    http://www.engr.usask.ca/classes/EE/372/
    EE392
    Electrical Engineering Laboratory

    Laboratory experiments and exercises of design software packages for the corequisite courses.

    http://www.engr.usask.ca/classes/EE/392/
    EE818
    Electromagnetic Wave Propagation

    The fundamentals of electromagnetism and its applications. Includes Maxwell's equations, multi-pole fields, electromagnetic waves, reflection and refraction, retarded potentials and radiation, dipole antennas, antenna arrays, rectangular and cylindrical waveguides, and microwave circuits.

    http://www.engr.usask.ca/classes/EE/818/
    EE820
    Electrical Material Science

    Review of general solid state physics for electrical engineers. An introduction to Wave-Mechanics. Band theory of solids, metals, semiconductors and insulators. Electrical conduction in solids. Structure and properties of materials

    http://www.engr.usask.ca/classes/EE/820/

    Research Projects