Cryogenic Operation of Junctionless Nanowire Transistors

Effect of the temperature on on Junctionless Nanowire Transistors electrical parameters down to 4K

“…The threshold voltage of the device has increased from 0.42 V at room temperature up to 0.88 V at T= 20 K, which leads to a slope of �-l.Sm V /K. This value is similar to the ones presented in [6] and [11], which studied JNTs in a temperature range from 100 K up to SOO K. Therefore, the VTH variation rate with T has not changed for very low temperatures. There are also some current oscillations for the two lower temperatures.…”

“…2, the measured drain current (JD) as a function of the gate voltage (Ves) with the device biased at a drain voltage of VDS = O.OS V is presented for different temperatures. Firstly, it can be noted that the current decreases with T. Similar drain current behavior in JNTs has been presented in [6] and [9][10][11]. In [10][11], ID reduction with T has been attributed to the impurity scattering, which is considered to be the dominant mobility scattering mechanism at high doping concentrations.…”

“…The low temperature operation of junctionless transistors has recently been reported in [6][7][8][9][10]. In the [6], Souza et al studied junction less devices similar to the ones of this work biased at low VDS down to 90 K in terms of threshold voltage (VTH), subthreshold slope (S) and transconductance (gn,).…”

“…In the [6], Souza et al studied junction less devices similar to the ones of this work biased at low VDS down to 90 K in terms of threshold voltage (VTH), subthreshold slope (S) and transconductance (gn,). In [7], Doria et al analyzed the analog operation of JNTs down to 90 K. Jeon et al [8] have presented experimental results of devices with a different gate stack than the one measured in the current work down to 80 K, which changes significantly the transistor performance.…”

Low-temperature electron mobility in heavily n-doped junctionless nanowire transistor

“…The temperature-dependent properties of the electron mobility from 90 K to 473 K of JNTs have been reported in several publications. 4,5 In fact, the impurities are almost completely ionized at those temperatures. However, the impurities are only partly ionized at extremely low temperatures, in which the donor ionization energy is larger than the thermal energy of electrons.…”