Week 4: Practical tasks based on the previous week

Introduction

Outcomes for this week are more practical, the sustainable development ethics and the Ideal CV plot, they are a kind of extension of the project under the support of the previous researches. Moreover, we compared our outcomes with another group.
Comparison with Group 2
We have compared out data with another group.

By comparing the two groups experimental results. The difference for two materials is the Hf content used in the HfSiO. With the percentage of Hf increasing to 70, we can find that the oxide relative permittivity increases to 10.6 . Meanwhile, the increase of doping density of silicon substrate is obvious and the oxide charge density becomes higher. However, the values of the other parameters are not much different.

Sustainable Development Ethics

In addition to researching the techniques in CMOS, we also need to know about some regulations about it, its market and ethical implications of large scale manufacture and sale.
As an electrical and electronic equipment (EEE), CMOS was covered by both WEEE and RoHS regulation, but RoHS have less limitation on it, since the main material of it are silicon and its compounds instead of other hazardous substances. While WEEE have regulations to manage WEEE can be recycled properly.

The implication are potentially existing in the large scale manufacture and sale, which need to bye fully considered. There are some main options. Firstly, health and security, it is obligatory to ensure the efficiency and safety of the production. Then, supplier, which is a role in the CMOS industry  influence the quality directly. Moreover, use, the threshold limit value need to be considered to ensure CMOS can be used safely.

The market is competitive, a new raw material will speed up the obsolescence of old material and captured the market quickly. Under the period when the economy is benefited, the sustainable development of the environment should also be considered. Furthermore, for companies, selling the patent of the product and earn patent fee, which will get funding for the next round of research and development, can be a sustainable strategy for both business and society, that can also promote and maintain healthy competition in the market.

CV Plot

Initially, when we research on the CV plot, we try to sketch graph by Matlab, the order of the original  given data are sorted descending. After load and handle these data easily, what we have implemented firstly is inverted the order of Voltage to ascending, which can order voltages increased from negative to positive.

Source Code:

load('Group1.txt');

%Load data

Voltage=flip(Group1(:,1));

%Divide the first column of data to Voltage and invert the order

Capacitance=flip(Group1(:,2));

%Divide the second column of data to Capacitance and invert the order

Then, we turn to sketch the plot.

Source Code:

figure

plot(Voltage,Capacitance,'lineWidth',4);
%Sketch the graph of Voltage-Capacitance with line width = 4

hold on;

Then we sketched  to get the real curve, which is shown in the blue line. 

In addition, we have got the Delta V in previous steps, which is about 0.78. As the flatband voltage will increase due to the negative oxide charges, relatively the real plot will translate to the right from the idea curve by the effect of negative charges, so we shift back to get the ideal plot, as shown in the red line.

Source Code:

IdealVoltage=Voltage-0.7856492835;

%All Voltage Minus 𝛥V to get achieve shift operation   

plot(IdealVoltage,Capacitance,'r-.','lineWidth',4);
%Sketch the graph of Capacitance-IdealVoltage with a dashed line which line width = 4  

hold on;

Finally, add legend, mark the maximum and minimum, label name and make labels in bold.

Source Code:

[cMax,cIndex]=max(Capacitance);

%Get the maximum of Capacitance and corresponding index, stored the value in the cMax, store the %index in cIndex 

plot(Voltage(cIndex),cMax,'.','MarkerSize',28);
%Mark a point on the Maximum with the size of the point is 28

hold on;

[cMin, cIndex2]=min(Capacitance);
%Get the minimum of Capacitance and corresponding index, stored the value in the cMax, store the %index in cIndex 

plot(Voltage(cIndex2),cMin,'.','MarkerSize',28);
%Mark a point on the Minimum with the size of the point is 28

hold on;

xlabel('Voltage (V)','fontSize',20,'lineWidth',5);
%Set the x axis' name and it's properties

ylabel('Capacitance (pF)','fontSize',20,'lineWidth',5);
%Set the y axis' name and it's properties

legend('Real','Ideal','Maximum','Minimum');
%Set the legend's name

set(get(gca,'XLabel'),'FontSize',20); 
%Set the size of font in CV plot

set(gca,'LineWidth',3);
%Set the width of line in CV plot

title('CV plot','fontSize',20);
%Set the title's name and it's properties

hold off

The final version is shown following:

Summary

These two different task have extended the breadth and depth of the knowledge about our topic. As sustainable development ethics  let us know the regulation and knowledge around CMOS, sustainable development is an essential consideration in the CMOS industry. Programming in Matlab to get the ideal CV plot take a better understanding of why and how the CV plot is shifted.

Attachment

MatLab Code:

load('Group1.txt');

Voltage=flip(Group1(:,1));

Voltage2=Voltage-0.7856492835;

Capacitance=flip(Group1(:,2));

figure

plot(Voltage,Capacitance,'lineWidth',4);

hold on;

plot(Voltage2,Capacitance,'r-.','lineWidth',4);

hold on;

[cMax,cIndex]=max(Capacitance);

plot(Voltage(cIndex),cMax,'.','MarkerSize',28);

hold on;

[cMin, cIndex2]=min(Capacitance);

plot(Voltage(cIndex2),cMin,'.','MarkerSize',28);

hold on;

xlabel('Voltage (V)','fontSize',20,'lineWidth',5);

ylabel('Capacitance (pF)','fontSize',20,'lineWidth',5);

legend('Real','Ideal','Maximum','Minimum');

set(get(gca,'XLabel'),'FontSize',20); 

set(gca,'LineWidth',3);

title('CV plot','fontSize',20);

hold off