On the leakage problem of MIM capacitors due to improper etching of titanium nitride


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Groenland, A.W. and Wolters, R.A.M. and Kovalgin, A.Y. and Schmitz, J. (2010) On the leakage problem of MIM capacitors due to improper etching of titanium nitride. In: STW.ICT Conference 2010, 18-19 Nov 2010, Veldhoven, The Netherlands (pp. pp. 89-92).

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Abstract:In this work, Metal-insulator-metal (MIM) capacitor structures are fabricated in a technology using TiN as electrode material. The electrical characterization revealed devices with small and large leakage currents. Scanning Electron Microscopy (SEM) inspection showed a correlation between high leakage currents and large roughness in the dielectric layer of the capacitor. Cross-section of leaky capacitors by means of a Focussed Ion Beam (FIB) showed a rough edge of the bottom electrode and the presence of particles leading to a rough dielectric layer. These artefacts are the result of improper wet chemical etching of the TiN layer. It is shown, high leakage currents and improper etching of the TiN layer are correlated.
Item Type:Conference or Workshop Item
Faculty:
Electrical Engineering, Mathematics and Computer Science (EEMCS)
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Link to this item:http://purl.utwente.nl/publications/76310
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