This website uses cookies to ensure you have the best experience. Learn more

Cv And Transistors Essay

1595 words - 7 pages

Student name

The homework is composed of discussions of the capacitor - voltage relationship (C-V characteristics) in MOS capacitors. Transistors are also part of the homework. The capacitor-voltage analysis is a technique that is widely used to determine wide range parameters of MOS capacitors. These parameters involve flat-band voltage, threshold voltage, substrate doping concentration and the thickness of the gate oxides.
The MOS capacitance is characterized by its capacitance, Cox. It has two capacitors that are connected in series at the depletion layer. These two capacitors are depletion layer and oxide capacitors that is, Cdep and ...view middle of the document...

The capacitor is as a result of the area of the metal gate. The MOS capacitor capacitance is dependent on the DC voltage (Montoro, 2007, pg. 312).
Question one
The MOS capacitor with a p-type polysilicon gate is depended on the applied voltage at the gate. Unlike the metal gate, the polysilicon MOS capacitor has three operation regimes. Two voltages, VT and VFB separates the three operation regimes. See figure 1 for more description. The three regimes are accumulation, depletion and inversion. In the case of the accumulation regime, the same type carriers accumulate at the surface of the body. With depletion operation regime, the surface is occupied by the depletion layer only. In other words, the surface becomes devoid of carries.
In the third operation regime, there is an aggregate of all the opposite type carriers at the surface and, therefore, inverting the conductivity type. The flat band voltage VFB is responsible for separating the depletion regime from the accumulation regime. The threshold voltage VT demarcates the inversion regime from the depletion regime.

Cmax = Cox
CQs Cmax

CHF Cmin = Cmos(VT)
Figure 1: MOS capacitance; graph of capacitance against Gate voltage
The threshold voltage of a p-type poly-silicon gate MOS capacitance has a negative value unlike that of a metal gate. Considering a positive flat-band voltage that is lesser than the gate voltage. Negative charges are induced on the semiconductor. Take note that for a metal gate positive charges are induced. Electrons being the only negative charges they accumulate at the surface of the semiconductor. The electron accumulation process is referred to as surface accumulation (Nicollian, 2006, pg. 89).
The flat band voltage is the voltage that appears on the surface when there are no charges at the surface. At this instance and across the oxide there appears no electric field. CMOS, accumulation = Cmax = Cox = ε ox tox as the capacitance when the slope of the graph is linear at the accumulation operation regime (Montoro, 2007, pg. 67).
Question two
tox = 10 nm,
ox = 3.9 and
T = 300K
K = 1.38 * 10-23
To find the slope before the stress choose two points along the before stress curve
P1 = (0, 10-12) and P2 = (0.5, 10-8)
Slope = ΔyΔx = ΔIΔV
Slope = 10-8 - 10-120.5-0 = 1.9998 *10-8
Therefore, the slope before the stress = 1.9998 *10-8
Slope after the stress can be calculated using the same formula as that before the stress (Kapoor, 2013, pg. 37)
P1 = (0.3, 10-12) and P2 = (0.5, 10-10)
Slope = ΔyΔx = ΔIΔV
Slope = 10-10 - 10-120.5-0.3 = 4.95 * 10-10
Cox = ε ox tox = 3.9 10 = 0.93
Cox = 0.93
∆Dit = Cox2.3kT(1slope before - 1slope after)
∆Dit = 0.932.3* 1.38 * 10-23 * 300(11.9998 *10-8 - 14.95 * 10-10)
∆Dit = 1.92 * 1029 cm-2eV-1
Question three
At the...

Other Essays Like Cv and Transistors

Living In A Cashless Society Essay

1637 words - 7 pages Money in a traditional sense no longer exists. Money is becoming much of a concept than a physical material, and most ordinary bitter have not see the reality of the switch. People today are using credit and debit cards on a regular basis and in everyday situations such as meal purchased at fast food, highway tolls, clothing, groceries, gas stations, etc. all of these means of systems could be regarded as a cashless society or world. The

The French And Indian War: The "Real" First World War

1955 words - 8 pages The Seven Years War, or more commonly referred to as “The French and Indian War”, has been called the true First World War. In this book The French and Indian War: Deciding the Fate of North America, the author and historian Walter R. Borneman paints a detailed and elaborate picture that justifies the claim of it being the first true war of global proportions. If ever there truly was a climax to the never ending feud of the European

Is The Use Of Animals In Medical Research A Necessary Measure?

1513 words - 7 pages Throughout history, animals have been used in experiments to test product safety and obtain medical knowledge that benefits both humans and animals alike. Every year there are numerous medical breakthroughs, such as medications and surgical instruments, which are tested on animals to insure their safety before they are deemed acceptable for human use. Even though the results of the experiments saved millions of human lives, they are also

Education And The Evolving Job Market

2363 words - 10 pages The lives of students today are changing. They are preparing for lives and jobs that have never before existed. If teachers hope to have a significant and worthwhile impact on these quickly changing lives, they must change the way they think, prepare, and instruct our future generations. Children cannot afford to have teachers who remain stagnant in their methods and ideals. Students crave instructors that are willing to allow them to tap

Young And Relentless

1737 words - 7 pages There are numerous influences that can be responsible of teenager’s behaviors and attitude as they develop. One factor that is important to these behaviors is parental figures being over involved or uninvolved in their children’s lives. Many of these effects include illegal substance abuse, rising sexual activity, underage alcohol consumption, and tobacco use. Studies show parental participation plays a key role in the characteristics developed

The Natural Law Theory

1231 words - 5 pages Obeying by the natural law theory is the only true and moral way to live life; especially a life lived in God’s image. God’s presence is a guiding factor to obtaining a moral and virtuous life, which can only be obtained by following the natural law theory. God created a set of laws as a supreme guide for humans to live life, like any law these laws were created to ensure wellbeing for everyone. The laws he created are the civil law, the natural

Resolved: Presidential Signing Statements Threaten To Undermine The Rule Of Law And The Separation Of Powers

1811 words - 8 pages The subject of signing statements has created much debate among the houses of Congress, government officials, and the public alike. These signing statements fall under the categories of constitutional and legislative history signing statements. Constitutional signing statements are those in which the president deems certain provisions of the legislation as unconstitutional, therefore they should not be enforced (Bradley & Posner, 2006

Oppressive Systems Of Government In Egypt And Animal Farm

1529 words - 7 pages As in Egypt, Orwell demonstrates through his allegorical novel “Animal Farm” that leaders are able to establish and maintain power over a people, and in turn create an oppressive and corrupt government system. Orwell shows the significant difference in the education and levels of knowledge in the animals, and how the government takes advantage of this difference. The split between the levels of intelligence is portrayed in the first chapter

The Pathway To Psychosis

1415 words - 6 pages “How all occasions do inform against me” is a line from act IIII, scene IIII of William Shakespeare’s Hamlet. This line, spoken by Hamlet, expresses his emotional state as he is currently overwhelmed by the death of his father, the king of Denmark, and the situation surrounding it. After Hamlet learns of his father’s death he finds out that his mother has married Claudius, Hamlet’s uncle. On top of all of that, Hamlet soon after

Rated “M” For “More Censorship Not Needed”

1241 words - 5 pages Since the moment video games became a commercial success there have been people who have pushed for unfair amounts of censorship to be placed upon the content of the games and its availability to children. These groups push for increased regulations on content but there is already an appointed group to handle this issue, the ESRB. Even though there has been an increase in mature content in the video game industry, increased censorship is not

Four Components Of A Legally Astute Social Media Marketing Manager

1914 words - 8 pages With the advances in technology constantly changing companies have to find better ways to market their products to consumers. The explosion of Facebook has given companies a way to market products to consumers. Examine how a legally astute manager can use social media to his advantage. Review different forms of dispute resolution and determine which one works the best. What is the best course of action, the government can use to

Related Papers

半導體元件製程簡介 Essay

3808 words - 16 pages when it is positively biased. Figure 3.14 Transition region −− −− −− −− −− ++ ++ ++ ++ ++ P N Vn Vp V0 I-V Curve of Diode Bipolar Transistor • • • • • PNP or NPN Switch Amplifier Analog circuit Fast, high power device I V -I 0 3 NPN and PNP Transistors E B C C NPN Bipolar Transistor C Emitter Base Collector n+ Al•Cu•Si SiO2 n-epi Electron flow n+ buried layer P-substrate p

The Separation Of Capital Ownership And Control

1577 words - 7 pages The argument of whether the separation of capital ownership and control is an efficient form of organization has constantly been a controversial issue. The criticism whether the controllers’ act is in the best interest of the owners’ wills never end as long as hired managers operate management. As the number of public companies has been increasing over the course of this century, meanwhile the American style of contact based corporation has

The Versatility And Flexibility Of Oled's

1014 words - 5 pages In April 1, 2002, organic light emitting diodes gain rise in the scientific community with their published, more practical form at Ames Laboratory. “Scientists at the U.S. Department of Energy's Ames Laboratory, in collaboration with scientists at the University of Michigan, Ann Arbor, have developed and demonstrated a novel, fluorescence-based chemical sensor that is more compact, versatile and less expensive than existing technology of its

Comparing The Moral Virtues Of Antony And Julian The Apostate

1103 words - 5 pages Roman emperor Julian the Apostate and Christian leader Antony both exhibited many qualities of character during their existence. Both of them led very distinctive lives although shared several ethical values. Book 25 of “The Later Roman Empire” and the book “Early Christian Lives” show concrete evidence of this. In the following essay, I will argue how both leaders’ lives were devoted to their religious beliefs and their mutual cardinal virtues