task 1 The type of substrate

( 11 February, 2015)

Firstly, we should learn some basic knowledge of MOSFET. We have received the data about the values of capacitance and voltage. We need to determine what type this substrate is from the C-V curve. therefore, we need to know the figures of n-type and p-type. In high-frequency, the figure 1 is the plot of n-type MOSFET [1] and figure 2 is the plot of p-type MOSFET [2]. 

figure 1

figure 2

Secondly,  we used origin software to analysis the data and plot the curve of capacitance-voltage. The figure 3 shows the curve we got from the data,

 Then, we could find this curve is similar with the curve of p-type. Therefore, this is a p-type substrate.

Reference list 

[1] Kim, Hyoung-Sub,"HfO2-based InP n-channel metal-oxide-semiconductor field-effect transistors and metal-oxide-semiconductor capacitors using a germanium interfacial passivation layer"  2008, Vol. 93 Issue 10.

[2] Stauffer, Lee, "Fundamentals of Semiconductor C-V Measurements.”  Evaluation Engineering，2008, Vol. 47 Issue 12, p20-24 。