Plasma-assisted atomic layer deposition of TiN/Al2O3 stacks for metal-oxide-semiconductor capacitor applications

D. Hoogeland, K.B. Jinesh, F. Roozeboom, W.F.A. Besling, M.C.M. Sanden, van de, W.M.M. Kessels

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Abstract

By employing plasma-assisted atomic layer deposition, thin films of Al2O3 and TiN are subsequently deposited in a single reactor at a single substrate temperature with the objective of fabricating high-quality TiN/Al2O3 / p-Si metal-oxide-semiconductor capacitors. Transmission electron microscopy and Rutherford backscattering spectroscopy analyses show well-defined interfaces and good Al2O3 stoichiometry, respectively. Electrical investigation of as-deposited test structures demonstrates leakage current densities as low as ~1 nA/cm2. Current-voltage (I-V) measurements demonstrate clear Fowler–Nordheim tunneling with an average TiN/Al2O3 barrier height of 3.3 eV. Steep Weibull distributions of the breakdown electric field around 7.5 MV/cm indicate good reliability of these devices. Time-dependent dielectric breakdown measurements demonstrate that the devices can sustain high operating electric fields of 3–4 MV/cm for the 10 year lifetime criterion. From capacitance-voltage (C-V) measurements, a dielectric constant (k) of 8.7± 0.1 was extracted for the Al2O3. No direct dependence on the deposition temperature was found in the range 350–400 °C, although the stack deposited at 400 °C demonstrates significantly lower C-V hysteresis of ~50 mV. A negative fixed oxide charge density of (9.6±0.2) x10 12 cm-2 was found to be present at the Al2O3 / p-Si interface. © 2009 American Institute of Physics.
Original languageEnglish
Article number114107
Pages (from-to)114107-1/7
Number of pages7
JournalJournal of Applied Physics
Volume106
Issue number11
DOIs
Publication statusPublished - 2009

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