考慮量子效應(yīng)的場效應(yīng)晶體管電學(xué)特性的研究
[Abstract]:Field effect transistor (FET) is a kind of voltage-controlled semiconductor device. It has attracted people's attention because of its simple fabrication, easy implementation and stable performance. It has been used in integrated circuits as amplifier and rectifier devices. The field effect transistors represented by metal-oxide-semiconductor field effect transistors (MOSFET) are widely used in large-scale and very large-scale integrated circuits. The high integration of the devices makes their sizes smaller and smaller. When the size of the transistor reaches the nanometer order of magnitude, because its geometric size is comparable to the wavelength of the electron, the influence of quantum effect on the device can not be ignored. In the study of MOSFET of quantum effect, the study of two-dimensional electron gas is its foundation. The Fang-Howard (FH) wave function proposed by Fang and Howard describes the two-dimensional electron gas. After Stern and Howard determine the parameters of the two-dimensional electron gas by the method of variation, this result is widely used in the devices that calculate the quantum effect in the future. In the study of tunneling effect of very thin oxide layer MOSFET, the wave function will penetrate the Si/SiO2 interface, and the wave function permeated into the oxide layer will be finite value at the Si/SiO2 interface rather than truncated at the interface. At the same time, most models for calculating tunneling effect use the wave function results determined by Stern, and the assumption of Stern wave function is that the wave function is truncated at the interface. The main work and conclusions of this paper are as follows: 1 according to the Stern wave function, we propose a more accurate and simpler wave function system to describe the two-dimensional electron gas, and the simultaneous Schr?dinger-Poisson equation is used to determine the parameters of the wave function. 2 in the tunneling effect of very thin MOSFET, we translate the Stern wave function and propose the osmotic wave function, and modify the finite barrier to make it accord with the actual MOSFET band structure. The non-zero interface wave function, tunneling probability and ground state electron energy contained in the tunneling model are modified by finite barrier.
【學(xué)位授予單位】:電子科技大學(xué)
【學(xué)位級別】:碩士
【學(xué)位授予年份】:2015
【分類號】:TN386
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