Chapter 17 I Want to See the Teacher's True Strength! (Please Read and Collect)

This was the first time Ke Zhan encountered such a situation, and he couldn't help but want to dampen the other party's spirit. He was so arrogant on the first day of class, what would happen in the future?

In addition, he really wanted to see Luo Yao's strength.

Maybe the other party could add a touch of glory to his future job title evaluation.

However, now that the class was in session, so many people were watching. If Ke Zhan set questions to test Luo Yao alone, he would inevitably be known as a chicken stomach among the students. He decided to find an opportunity to test Luo Yao.

"Okay, since Luo Yao has already learned the lessons for this semester, you might as well listen again to see if your own understanding is the same as what we are going to talk about."

Luo Yao thought it made sense, so he continued to sit and wait for Ke Zhan to start the lecture.

Ke Zhan calmed down and immediately got to the point.

He was going to continue the basic theory today, but when he thought of Luo Yao's words just now, he temporarily changed the content of the lecture and changed it to explaining exercises.

This was a tough situation for other students. They were still confused about the basic theories. When they saw the questions Ke Zhan asked on the blackboard, their eyes went dark.

"Okay, let's take a look at this question. Suppose there is a p-n junction solar cell chip."

"The electron mobility of the p-type semiconductor is μ_p, the electron diffusion coefficient is D_p, the boron (B) doping concentration is N_A, the electron mobility of the n-type semiconductor is μ_n, the electron diffusion coefficient is D_n, and the phosphorus (P) doping concentration is N_D."

"The surface reflectivity of the solar cell is R, the incident light intensity of the sun is I_0, and the incident angle is θ."

"Come on, let's calculate the short-circuit current (I_sc) of the solar cell."

After Ke Zhan finished speaking, everyone in the classroom fell silent.

"Fuck, this question is really vicious, are you trying to kill me?" Wang Ye lived in Bengbu, and he didn't recognize half of the things on the blackboard.

What else is there to learn!

He really regretted entering this department because of his good physics grades.

"How is it? Don't you know?" Ke Zhan held the chalk and glanced at Luo Yao.

Didn't you say you had already learned it by yourself?

Why didn't you respond?

Ke Zhan felt a little disappointed.

It seems that Luo Yao is just a talker who is more capable than capable.

What national competition three first prizes, it is very likely because the test questions this year were simple.

In the future, we really need to take good care of such people, otherwise they will be beaten by society when they enter the society.

Of course, Luo Yao didn't move, because he wanted to see how the other party's problem-solving method was different from his own.

For Luo Yao, solving problems is the process he enjoys the most. If he can learn new problem-solving methods, then he will make a profit.

"Come on, let's start solving problems."

"First, we need to understand what short-circuit current is. Short-circuit current is the current of a solar cell when there is a short-circuit external load resistor at both ends of the battery, that is-"

"Isc=qμpNAμpNDTWI0sin(θ)"

"Teacher, there is a problem."

Before Ke Zhan started to continue, Luo Yao raised his hand and said.

What the hell?

He actually figured out the problem?

When the other students were about to fall asleep, Luo Yao's voice dissipated their sleepiness.

Everyone looked at the blackboard and didn't see any problem.

"What's the problem?" Ke Zhan was stunned. He frowned and looked at Luo Yao, motioning him to stand up and speak.

"Teacher, the assumption of the question is a PN junction solar cell chip."

"When considering the short-circuit current (Isc) of a PN-type solar cell, we have to consider two key factors: the electron doping concentration (ND) of the n-type semiconductor and the electron doping concentration (NA) of the p-type semiconductor."

"These two doping concentration differences lead to concentration gradients of electrons and holes, which in turn affect the current. ."

"In a PN junction, when an n-type semiconductor and a p-type semiconductor are in contact, electrons flow from the n-type semiconductor to the p-type semiconductor, while holes flow from the p-type semiconductor to the n-type semiconductor, which leads to a redistribution of charge. ."

"So when calculating, it should be like this. "

After Luo Yao expressed his thoughts, he walked to the podium without any hesitation, took out a pen and added a few strokes after the formula written by Ke Zhan.

Isc=q(μnNDμpNA)TWI0sin(θ)

"μ_nN_D and μ_pN_A represent the contribution of electrons in n-type semiconductors and holes in p-type semiconductors respectively. The difference between the two constitutes the current of the entire solar cell. "

"This current is generated under the action of the built-in electric field. The size and direction of the built-in electric field are determined by the difference in doping concentration. "

"So this is the correct way to calculate the short-circuit current. "

While Luo Yao was speaking, Ke Zhan was verifying it. Soon he knew that Luo Yao was right.

He didn't expect that this little mistake was actually seen by Luo Yao.

In order to save face, Ke Zhan could only say: "This is just a small mistake of mine. Teacher, I recently published a paper, so I was very busy and didn't rest well. "

"Paper?"

"What direction did the teacher research? ”

“Design and implementation of microchip power circuit driven by solar photovoltaic cell assembly.” This is Ke Zhan’s masterpiece. Ke Zhan has been preparing for the title of associate professor this year. To be evaluated as an associate professor, he has to publish papers, so he is indeed busy.

After he finished speaking, he did not forget to ask the students to find semiconductor journals to study.

In order to dispel the embarrassment caused by Luo Yao's correction just now, Ke Zhan basically talked about the process of writing this paper.

Luo Yao returned to his seat, sat and listened, and felt that Ke Zhan's level was mediocre.

After the class, Ke Zhan quickly left with his book.

After Wang Ye saw Luo Yao leave, he exhaled and said: "You said that you were too disrespectful to correct him just now. What if he secretly makes things difficult for you?"

Luo Yao frowned: "No, even if Mr. Ke's level is not high, he will not do this."

"Shh!" Wu Tianming hurriedly stopped Luo Yao from continuing to talk. After he took the two out of the classroom, he said: "Are you two crazy? Discussing these in the classroom, what if someone hears and goes to tell tales?"

"What's the point of doing this?" Luo Yao looked puzzled.

Wu Tianming said faintly: "Of course it's to pass the exam."

"University bully, the final exam score should be divided into exam score and regular score. The failure rate of our major is about 60%. Guess how many people do extra things to get full regular score?"

"If you continue like this, what if the regular score is deducted?"

"What percentage of the total score is the regular score?" Luo Yao thought about it and felt that the most important thing should be asked first.

"30%."

"That's not bad, even if it's deducted, you can still pass." Luo Yao said nonchalantly.

Wu Tianming and Wang Ye looked at each other, knowing that this was something that only a bully could say.

"By the way, where is the school library?" Luo Yao suddenly became excited.

"It's in a building outside."

"Are you going to read a book?"

"I'm going to read Teacher Ke's paper. I want to see how good he really is."

P.s. Thank you all for your support and rewards. I have added another chapter. I will continue to ask for votes. If the results are good, I will get 10,000 votes a day after it is released!