Civilization Template

Chapter 152 Blue LED
University of Technology, new building

There was a lively scene in the lecture hall on the first floor.

Above the stage, there are two banners hanging in both Chinese and English, 【Warmly celebrate the launch and global distribution of "MEMS Sensor"】

Below the stage, the audience is entering the arena one after another.

As the first international-oriented professional journal published in English, "MEMS Sensor" has aroused heated discussions among teachers and students as soon as it came out.

The teachers and students of the Department of Electronics are especially proud of this journal.So more and more electronics students are still coming to join us.The large classroom, large enough to accommodate thousands of people, quickly became overcrowded.

In the middle of the classroom, a group of students majoring in digital circuits were discussing happily.

"Why didn't I see your name?" Wu Wei flipped through the new journal repeatedly.

"I haven't written my thesis yet."

Yu Yaoying looked indifferent, but the smile on the corner of his mouth betrayed his inner pride.

In the process of launching the new journal, the members of the MEMS team will get the first month due to their contributions, and everyone will get a chance to publish their papers first.

Although the matter has not been publicized, many people are aware of this potential agreement.

As a result, many master and doctoral students majoring in foreign affairs found Yu Yaoying, hoping to cooperate with him, using his proficiency in semiconductor equipment and his experience in participating in MEMS projects for many times, to jointly complete new projects.Of course, Yu Yaoying's interpersonal relationship and the looming quota of papers are the real prerequisites for cooperation.

It's a pity that the classmates in the class didn't pay much attention to this, and the topic quickly changed.

"I heard that you are going to change your major?" Wu Wei asked.

"Are you going to go to Professor Zhao's newly established integrated circuit major next semester?" Dong Xiujie also turned his head around.

Although Yu Yaoying is not handsome due to his height and stature, he has won the secret attention of many girls thanks to the brilliant achievements of the MEMS project team.

"Yes." Yu Yaoying simply nodded and admitted.

"If that's the case, we will be separated." Wu Wei's voice became smaller and smaller as she spoke.

"You can also sign up for the integrated circuit major. The new major will be open to all students of the electronics department. The official news will be announced after the final exam."

"Really? We can sign up too?"

The students are all interested.What followed were all kinds of strange problems.

"Integrated circuits, which one is better than our digital circuits? How is Professor Zhao? Are their professional courses difficult? If I go with you, can I join the MEMS group?"

"Do you want me to go with you?" Wu Wei asked in a low voice.

"Uh"

Yu Yaoying was caught off guard. "Uh uh. In fact, not everyone wants to major in integrated circuits."

"Oh? How do you say it?" Dong Xiujie asked on behalf of the other girls.

"Integrated Circuits major will formally enroll students this year. Our class of old students will be converted to a combined master's degree. After we graduate, we will directly obtain a master's certificate!"

"Then look, am I qualified enough?" Wu Wei asked again.

In another corner of the classroom, several students majoring in detection sat together.

"You haven't decided yet, do you want to major in integrated circuits?" Yun Li asked.

Although in principle, the integrated circuit major is only open to students from the Department of Electronics, MEMS group members are all exceptions.Feng Yan and Yun Li have already decided to change jobs.

After all, the new professional class, especially the group of Feng Yan, will be treated with priority by the school, and their treatment in all aspects will be treated in the same way as graduate students.

"I'm still thinking about it." Cheng Xing kept touching the journal in his hand.The cover of the new journal is the inverse piezoelectric tweezers jointly authored by him and Chen Quan.

"What are you hesitating about?" Yun Li was a little anxious. "If you don't go, it will be difficult for us to be together in the future."

"I actually want to transfer to the physics department."

During this time, Cheng Xing had a very good relationship with Professor Wang Wenfang.He even served as a physics class representative and often discussed with Professor Wang about astrophysics.

Under the guidance of Wang Wenfang, his black hole gravitational universe theory was revised and perfected little by little.

"But if you transfer to the physics department, there is no chance at all. Besides, can your family agree with you to transfer to the physics major?"

"Yes. But"

"Anyway, there is no chance to transfer to the physics department now. You should transfer to the integrated circuit major first, and then transfer to physics when you have the opportunity. It's not too late!" Yun Li advised again.

"Let me think about it again. I want to discuss it with Professor Wang and see if she can do something."

"But."

"By the way. Don't just talk about me. Is your paper ready?" Cheng Xing took the initiative to change the subject.

"Our paper is ready, but unfortunately, our paper won't be on the cover of the journal." Yun Li shrugged.

"why?"

"Why do you say?" Yun Li was annoyed. "Don't you find it strange that a journal that focuses on sensors uses tweezers as the cover for two consecutive issues?"

"Oh? That's right!"

Cheng Xing scratched his head. "Then what about postponing it? Waiting for the limelight to be announced?"

"No chance."

Sitting on the other side, Feng Yan, who hadn't spoken all this time, poked his head over. ""MEMS Sensor" has no shortage of papers now. Professor Zhao and the others no longer need tweezers papers for appearance."

As more and more scientific researchers, institutions, and even companies make efforts in the field of MEMS, a large number of achievements continue to emerge.

But correspondingly, the number of publications of MEMS papers has not increased but decreased.Because of the hot news effect of MEMS, the trend is gradually ebbing due to aesthetic fatigue.

As soon as the news of the publication of "MEMS Sensor" was released, it immediately caused great repercussions around the world.A large number of high-quality papers have been posted.

"How could this be?" Cheng Xing was a little embarrassed.After all, his paper was on the cover. "Why don't your tweezers go to other journals?"

"It's not necessary." Yun Li shrugged. "Haven't you heard? Chen Quan and Qu Yanqiu are going to start a new big project, and we won't be short of papers in the future."

"is it?"

"Of course! But if you don't follow me, maybe you won't be part of the new project."

"Uh"

Cheng Xing began to struggle again.

It seems that switching to an integrated circuit major first is an option that can be either advanced or defensive.But what about reality?Cheng Xing is not a star student like Chen Quan, how could the University of Technology tolerate an ordinary student changing majors many times?
On the one hand, there is easy money at your fingertips, and on the other hand, the childhood wish that is far away.

"Stop talking. The ceremony has begun." Feng Yan whispered.

Amid warm applause, Zhao Liangcai, on behalf of the review committee of the journal, received a letter of appointment symbolizing authorization from a white scholar who was invited to visit.

"MEMS Sensor" was officially launched.

Huang Chuxiong and other core personnel stood in a row on the stage, welcoming the constantly lit camera flashes.
-
When Chen Quan arrived in Fengtian, the equipment was already in place, and all kinds of external gas pipelines had been connected.

As a designated manufacturer of semiconductor equipment, the debugging environment of Keyi is better than that of the microelectronics laboratory of the University of Technology and the MEMS laboratory of Songhuajiang Semiconductor.

The arrival of Chen Quan this time is mainly to finalize some variables.

Different from ordinary equipment, some detailed parameters of MOCVD cannot be fully expressed on the mechanical diagram, such as the angle of the nozzle, the flow rate of the gas, the heating temperature of the workpiece, etc., all of which need to be confirmed in the final assembly and debugging stage.

Few researchers choose the GaN route. In addition to the theoretically high defect (dislocation) density of GaN, which will affect the light intensity, the difficulty of GaN synthesis is also an important reason.

The growth temperature of GaN materials is much higher than that of traditional semiconductors, generally above 1000 degrees.At such a high temperature, the gas on the substrate surface will diffuse upward spontaneously, resulting in insufficient nitrogen partial pressure on the epitaxial surface, and GaN is easy to spontaneously decompose.

In the drawings provided by Chen Quan, a brand-new structure is provided, that is, the double-beam reaction chamber structure.That is, one path is a horizontal airflow that carries the precursors of the chemical reaction into the reaction chamber, and the other path is a vertical airflow that enters from the reaction chamber from top to bottom.

There are two airflows, one is side blowing and the other is blowing from top to bottom.The airflow from top to bottom plays a role in suppressing GaN decomposition.

The principle is simple to say, but the internal fluid structure of MOCVD is very complex. The relationship between the two airflows, angle, speed, and reaction temperature, etc., need to go through many experiments before they can be finally determined.

In Chen Quan's "memory", it took "he" more than a week to completely confirm several important data.

"Come on, let's get started."

With Chen Quan's nod, the device started to power on
(End of this chapter)