Thin film chip resistors with high resistance and low temperature coefficient of resistance |
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| Authors: | WANG Xiuyu ZHANG Zhisheng BAI Tian LIU Zhonge |
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| Institution: | School of Electronics Information Engineering,Tianjin University,Tianjin 300072,China |
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| Abstract: | High resistance thin film chip resistors (0603 type) were studied, and the specifications are as follows: 1 kΩ with tolerance
about ±0.1% after laser trimming and temperature coefficient of resistance (TCR) less than ±15×10?6/°C. Cr-Si-Ta-Al films were prepared with Ar flow rate and sputtering power fixed at 20 standard-state cubic centimeter per
minute (sccm) and 100 W, respectively. The experiment shows that the electrical properties of Cr-Si-Ta-Al deposition films
can meet the specification requirements of 0603 type thin film chip resistors when the deposition time was about 11 min and
deposition films were annealed at 500 °C for 120 min. The morphologies of Cr-Si-Ta-Al film surfaces were examined by scanning
electron microscopy (SEM). The analysis suggests that Ta and Al may be distributed in CrSi2 film with mixed form of several structures (e.g., bridge-like, capillary-like or island-like structures), and such a structure
distribution is responsible for high film resistance and low TCR of Cr-Si-Ta-Al film. |
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| Keywords: | thin film chip resistor high resistance low temperature coefficient of resistance alloy target magnetic sputtering Cr-Si-Ta-Al film |
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