Browsing by Subject "Polycrystalline materials"
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Item Open Access Electric breakdown in polycrystalline semiconductors with highly nonlinear I-V characteristics: Simulations for simple barrier height models(1997) Yildirim H.E.; Tanatar, Bilal; Canessa, E.An extension of the Canessa and Nguyen binary model for the nonlinear current-voltage (I-V) characteristics of polycrystalline semiconductors, based on the electrical properties of individual grains, is presented. Simple analytical models for the nonuniform distribution of barrier heights at grain boundaries are assumed. The set of nonlinear Kirchhoff equations, that determine the macroscopic current across the specimen, and the nonlinearity coefficient α are solved numerically. The applied voltage dependence of the barrier height models gives α values reaching ≈ 50, indicating high nonlinearity as required by potential commercial applications. © Tübi̇tak.Item Open Access Soft x-ray photoemission studies of Hf oxidation(A I P Publishing LLC, 2003) Süzer, Şefik; Sayan, S.; Banaszak Holl, M. M.; Garfunkel, E.; Hussain, Z.; Hamdan, N. M.Charging of oxide films under x rays is an important issue that must be taken into consideration for determination of core-level binding energies as well as valence band offsets. Measurements are taken as a function of time, thickness, and annealing condition. Photoemission results show the presence of metallic Hf with the 4f7/2 binding energy of 18.16 eV, and at least one clear suboxide peak.