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Observation and Measurement of Negative Differential Resistance on PtSi Schottky Junctions on Porous Silicon
Department of Physics, Islamic Azad University, Qom Branch, Qom, Iran
Electrical Engineering Department, Shahid Beheshti University, Tehran, Iran
Electrical Engineering Department, K.N. Toosi University, Tehran, Iran
Electronic Research Center, Tehran, Iran
Qom Payame Noor University, Iran
* Author to whom correspondence should be addressed.
Received: 19 November 2009; in revised form: 29 December 2009 / Accepted: 18 January 2010 / Published: 27 January 2010
Abstract: Nanosize porous Si is made by two step controlled etching of Si. The first etching step is carried on the Si surface and the second is performed after deposition of 75 Å of platinum on the formed surface. A platinum silicide structure with a size of less than 25 nm is formed on the porous Si surface, as measured with an Atomic Forced Microscope (AFM). Differential resistance curve as a function of voltage in 77 K and 100 K shows a negative differential resistance and indicates the effect of quantum tunneling. In general form, the ratio of maximum to minimum tunneling current (PVR) and the number of peaks in I-V curves reduces by increasing the temperature. However, due to accumulation of carriers behind the potential barrier and superposition of several peaks, it is observed that the PVR increases at 100 K and the maximum PVR at 100 K is 189.6.
Keywords: nanoporous Si; platinum silicide; quantum tunneling effect; negative differential resistance
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Banihashemian, S.M.; Hajghassem, H.; Erfanian, A.; Aliahmadi, M.; Mohtashamifar, M.; Mosakazemi, S.M. Observation and Measurement of Negative Differential Resistance on PtSi Schottky Junctions on Porous Silicon. Sensors 2010, 10, 1012-1020.
Banihashemian SM, Hajghassem H, Erfanian A, Aliahmadi M, Mohtashamifar M, Mosakazemi SM. Observation and Measurement of Negative Differential Resistance on PtSi Schottky Junctions on Porous Silicon. Sensors. 2010; 10(2):1012-1020.
Banihashemian, Seyedeh Maryam; Hajghassem, Hassan; Erfanian, Alireza; Aliahmadi, Majidreza; Mohtashamifar, Mansor; Mosakazemi, Seyed Mohamadhosein. 2010. "Observation and Measurement of Negative Differential Resistance on PtSi Schottky Junctions on Porous Silicon." Sensors 10, no. 2: 1012-1020.