| Budget Amount *help |
¥4,810,000 (Direct Cost: ¥3,700,000、Indirect Cost: ¥1,110,000)
Fiscal Year 2019: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Fiscal Year 2018: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Fiscal Year 2017: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
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| Outline of Final Research Achievements |
Variable capacitance functions were demonstrated utilizing the transport of Li ions in a Pt/lithium phosphorous oxynitride (LiPON)/Pt structure. The capacitance originates mainly from the formation of an electrochemical double layer (EDL) at the interfaces between LiPON and Pt. Voltage applications drive Li ions from the positively biased electrode to the negatively biased one, and the EDL capacitance at cathode decreases significantly at higher voltages. As a result, the LiPON capacitor exhibits decreased capacitance as the voltage bias is increased. A voltage-controlled oscillator (VCO) operation was also demonstrated by incorporating the variable capacitors into an oscillator circuit. The VCO clearly shows that the oscillation frequency of the output waveforms is exponentially increased with an increase in the input direct current voltage. This result suggests the usefulness of the ionic variable capacitor.
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