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Tunable and Wireless Photoimpedance Light Sensor

  • Tanuj Saxena (a1), Sergey Rumyantsev (a1), Partha Dutta (a1) and Michael Shur (a1) (a2)


We report on the effects of the frequency dispersion in light sensitive materials used in photoimpedance wireless sensors. An example of such a sensor is a gated semiconductor connecting two or more fixed capacitances. The impedance of the device under illumination is changed by the change in the photoresistance of the semiconductor layer and the change in the gate-semiconductor capacitance. We report on the design and simulation of the frequency dispersion of the impedance of this device in silicon and discuss the physics and device performance. We also evaluate the dynamic range and sensitivity of the wireless photoimpedance sensors and show their advantages for wireless sensing applications compared to more conventional light sensors.



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1. Ciplys, D., Chivukula, V. S., Sereika, A., Rimeika, R., Shur, M. S., Hu, X., and Gaska, R., “Wireless UV sensor based on photocapacitive effect in GaN,” Electron. Lett., vol. 45, no. 12, p. 653, 2009.
2. Chivukula, V., Ciplys, D., Sereika, A., Shur, M., Yang, J., and Gaska, R., “AlGaN based highly sensitive radio-frequency UV sensor,” Appl. Phys. Lett., vol. 96, no. 16, p. 163504, Apr. 2010.
3. Lopez, D. et Al., “MOS capacitors characterization under illuminationIEEE 26th International Conference on Microelectronics, pp 583585, 2008
4. Grosvalet, J. and Jund, C., “Influence of illumination on MIS capacitances in the strong inversion region,” IEEE Trans. Electron Devices, vol. 14, no. 11, pp. 777780, Nov. 1967.
5. Chakrabarti, P., Abraham, B. R., Dhingra, A., Das, A., Sharan, B. S., and Maheshwari, V., “Effect of illumination on the characteristics of a proposed hetero-MIS diode,” IEEE Trans. Electron Devices, vol. 39, no. 3, pp. 507514, Mar. 1992.
6. Saxena, T., Rumyantsev, S. L., Dutta, P. S., and Shur, M., “CdS based novel photo-impedance light sensor,” Semicond. Sci. Technol., vol. 29, no. 2, p. 025002, Feb. 2014.



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