We demonstrate that the temperature coefficient of resistance (TCR) of NiCr thin film resistors can be effectively controlled by changing the film thickness over a certain range. We have observed a direct dependency between TCR and sheet resistance, which can be expressed by the equation: TCR(in ppm/C)=525*exp(-0.01*sheet (in Ohms/sq)). This behavior can be explained by considering the transition from a bulk conductivity mechanism to a mechanism dominated by charge carrier creation and tunneling between metallic islands.
Time-Dependent Dielectric Breakdown (TDDB) data for very thick (8um) silica-based dielectrics is reported at relatively low fields (< 5MV/cm) but at extremely high voltages (up to 4000V). TDDB data was taken across a wide range of dielectric thicknesses ranging from 38Å to 8μm (80,000Å). Consistent with the TDDB results generally reported for thin films, a thickness-independent effective dipole moment of ~13eÅ was concluded from the testing data. TDDB data is also presented for stacked dielectrics structures (Nitride/Silica) which tend to show a strong polarity dependence, depending on whether electron injection is into the nitride or oxide layer. While the time to failure is polarity dependent, the effective dipole moment is independent of polarity. [
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