DipNovel Chapter 17: I want to see the teacher's true strength!
Chapter 17: I want to see the teacher's true strength!
This was the first time Ke Zhan had encountered such a situation, and he couldn't help but want to deflate the other person's arrogance. If he was this arrogant on the first day of class, what would he be like in the future?
In addition, he really wanted to see Luo Yao's strength.
Who knows, maybe the other party can add a touch of glory to my future professional title evaluation.
However, since class is in session and so many people are watching, if Ke Zhan were to give Luo Yao a test now, he would inevitably be seen as petty and narrow-minded among the students. Therefore, he decided to find an opportunity to test Luo Yao.
"Alright, now that Luo Yao has learned the lessons for this semester, why not listen again and see if your understanding matches what we're about to teach."
Luo Yao thought it made sense, so he sat up straight and waited for Ke Zhan to start his lesson.
Ke Zhan composed himself and immediately got to the point.
He was originally going to continue with the basic theory today, but after thinking about what Luo Yao had just said, he changed the content of his lecture and switched to explaining exercises.
This was tough on the other students, who were still completely clueless about the basic theories. When they saw the questions Ke Zhan wrote on the blackboard, they were immediately overwhelmed.
"Okay, everyone, let's look at this question. Suppose we have a pn junction type solar cell chip."
"The electron mobility of the p-type semiconductor is μ_p, the electron diffusion coefficient is D_p, and 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 reflectance of the solar cell is R, the incident light intensity of sunlight is I_0, and the incident angle is θ."
"Let's calculate the short-circuit current (I_sc) of this solar cell."
After Ke Zhan finished speaking, everyone in the classroom fell silent.
"Holy crap, this question is really vicious, is it trying to kill me?" Wang Ye was stunned; he didn't recognize half of what was on the blackboard.
What's the point of learning this?!
He now truly regrets getting into this department because of his good physics grades.
"How about it? Doesn't everyone know?" Ke Zhan held the chalk, his gaze sweeping over Luo Yao.
Didn't you say you had already taught yourself?
Why is there no response?
Ke Zhan felt a little disappointed.
It seems that Luo Yao is all talk and no action.
The fact that he won first prize in three subjects in the national competition is very likely because this year's exam questions were easier.
We really need to keep a close eye on people like this in the future, otherwise they'll suffer the harsh realities of society once they enter it.
Luo Yao didn't move, of course, because he wanted to see how the other person's solution method differed from his own.
For Luo Yao, solving problems is the most enjoyable part of the process, and if he can learn new problem-solving methods, then he has gained something.
"Alright, let's start solving the problem."
"First, we need to understand what short-circuit current is. Short-circuit current is the current in a solar cell when there is an external load resistor short-circuited across the two ends of the cell. That is—"
"Isc=q⋅μp⋅NA⋅μp⋅ND⋅TW⋅I0⋅sin(θ)"
"Teacher, there's a problem."
Before Ke Zhan could continue speaking, Luo Yao raised his hand and spoke up.
Holy crap?
He actually figured out the problem?
Just as the other students were about to doze off, Luo Yao's voice dispelled their drowsiness.
Everyone looked at the blackboard but couldn't see anything wrong.
"What's the problem?" Ke Zhan was taken aback. He frowned and looked at Luo Yao, gesturing for him to stand up and speak.
"Teacher, the problem assumes a PN junction type solar cell chip."
When considering the short-circuit current (Isc) of a PN-type solar cell, we need 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.
"The difference in these two doping concentrations leads to a concentration gradient of electrons and holes, which in turn affects the current."
"In a PN junction, when an n-type semiconductor and a p-type semiconductor come into 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 this is how it should be calculated."
After Luo Yao expressed his thoughts, he walked to the podium without any hesitation, took out a pen, and added a few strokes to the formula written by Ke Zhan.
Isc=q⋅(μn⋅ND−μp⋅NA)⋅TW⋅I0⋅sin(θ)
"μ_n⋅N_D and μ_p⋅N_A represent the contributions of electrons in the n-type semiconductor and holes in the p-type semiconductor, respectively. The difference between these two values constitutes the current in the entire solar cell."
"This current is generated under the influence of the built-in electric field, and the magnitude and direction of the built-in electric field are determined by the difference in doping concentration."
"Therefore, this is the correct method for calculating short-circuit current."
As Luo Yao spoke, Ke Zhan verified the information, and soon he knew that Luo Yao was right.
He hadn't expected that Luo Yao would notice his small mistake.
To save face, Ke Zhan could only say, "This was just a small typo on my part. Teacher, I recently published a paper, so I've been very busy and haven't had much rest."
"paper?"
"What area of research does the professor specialize in?"
"Design and Implementation of Microchip Power Circuit Driven by Solar Photovoltaic Cell Modules." This is Ke Zhan's proud work. Ke Zhan has been preparing for the promotion of associate professor for a year. To be promoted to associate professor, he needs to publish papers, so he is indeed very busy.
After he finished speaking, he didn't forget to tell the students to find semiconductor journals to study.
To ease the embarrassment caused by Luo Yao's correction, Ke Zhan then proceeded to talk about the process of writing the paper.
Luo Yao returned to his seat and listened, and he felt more and more that Ke Zhan's level was mediocre.
After class, Ke Zhan quickly grabbed his books and left.
After watching Luo Yao leave, Wang Ye sighed and said, "You were being too disrespectful by pointing that out to him. What if he secretly makes things difficult for you?"
Luo Yao frowned: "No, even if Teacher Ke isn't very skilled, he wouldn't do that."
"Shh!" Wu Tianming quickly stopped Luo Yao from continuing. After leading the two out of the classroom, he said, "Are you two crazy? What if someone hears us discussing this in the classroom and goes to tell on us?"
"What's the point of doing this?" Luo Yao asked, looking completely bewildered.
Wu Tianming said quietly, "Of course, it's for passing the exam."
"Hey top students, final exam grades are divided into exam scores and participation scores. Our major has a failure rate of around 60%. Guess how many people do extra things to get full marks for participation?"
"What if your performance points are deducted if you keep going like this?"
"What percentage of the total grade does the participation grade account for?" Luo Yao thought for a moment and decided to ask the most important question first.
30%.
"That's alright, even if I lose all the points, I'll still pass," Luo Yao said nonchalantly.
Wu Tianming and Wang Ye exchanged glances, knowing that only a top student could say such a thing.
"By the way, where is the school library?" Luo Yao suddenly perked up.
"It's in a building outside."
"Do you want to go read a book?"
"I'm going to read Professor Ke's papers; I want to see what his true abilities are like."
P.S. Thank you all for your support and donations. An extra chapter has been added. Please continue to vote. If the performance is good, I will write 10,000 words a day after it is officially released!