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Developing MEMS sensors with a high strain sensing range (up to 0.6) and a stepwise sensing mechanism could enable widespread downstream applications, by allowing intimate, mechanically conformable integration with soft biological tissues. Most approaches to date focus on challenges to associate the sensing mechanism with high peak strains under large deformation. By designing and characterizing test...
This paper presents a method of electrically determining the permeability of patterned electroplated structures and brings together the simultaneous wafer mapping of magnetic permeability, electrical resistivity and mechanical strain of electroplated ferromagnetic films together with the thickness of the films and their composition. The wafer mapping of all these properties is implemented using set...
This paper reports on the sensing of large strain using a mechanically actuated switch gate and a variable resistor surface creasing test structure. Test structures with different gate and interconnect/wiring geometries have been designed, fabricated and characterised. They respond to designed strain values with a reduction in device resistivity of 11 to 12 orders of magnitude. Results from strain...
This paper reports the design and application of test structures for extracting the resistance of features formed when fabricating evaporated platinum (Pt) thin film structures on patterned, sputtered tantalum nitride (TaN). The combination of these two layers is used to produce an integrated resistive sensor structure. Two resistive features were considered during the test structure design: firstly...
Electrical test structures for the characterisation of Optical Proximity Correction (OPC) have been fabricated in thin aluminium using i-line lithography and reactive ion etching. Initial electrical measurements are presented which show an increase in the resistance of a right angled section of Al track as the level of OPC on the inside corner is increased. Structures with OPC applied to the outer...
Electrical test structures have been designed to enable the characterisation of corner serif forms of optical proximity correction. These structures measure the resistance of a conducting track with a right angled corner. Varying amounts of OPC have been applied to the outer and inner corners of the feature and the effect on the resistance of the track investigated. A prototype test mask has been...
The effects of the GHOST proximity correction process on chrome-on-quartz photomasks can prove difficult to quantify and so they are not routinely characterised. This paper presents a methodology for addressing this issue using electrical test structures designed to measure dimensional mismatch. In the past these have been used successfully to characterise standard GHOSTed photomasks, which displayed...
This paper compares electrical, optical, and atomic force microscope (AFM) measurements of critical dimension (CD) made on a chrome on quartz photomask. Test structures suitable for direct, on-mask electrical probing have been measured using the above three techniques. These include cross-bridge linewidth structures and pairs of Kelvin bridge resistors designed to investigate dimensional mismatch...
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