I've done whatever I want

The bare die after using KOH solution to corrode the copper wires shine silver under the fluorescent lamp.

Logitech carefully held the naked dies with metal tweezers and placed them one by one on the stage of the high-power tool microscope. While staring at the display screen, he twisted the focus adjustment mechanism with his hands. After a while, the display screen The above shows a clear picture of the chip pad.

He slowly moved the stage, observed each pad of the five chips, then shook his head and said: "Of these five chips, four are good, and one has a crater! Look, this is it. Location!"

Xin Tong took a closer look and saw that part of the flat pad was torn open. It may be due to the depth of field. The torn part looked black.

"Lao Luo, what do you think is the possible cause of the crater problem?" Xin Tong asked after thinking for a moment.

Since acquiring Wuji Semiconductor, he has been busy taking postgraduate entrance examinations and has no time to pay attention to the development of copper wire technology.

Today was the first time she came into contact with this craft. Xin Tong was full of desire to challenge.

"Based on my experience, there are several possible reasons. One is the quality of the fired copper balls. The copper balls are too large or too small. The surface of the copper balls is oxidized, the hardness increases, and the buffering stress is reduced. The other is the base island on the substrate. The upward floating makes it uneven and the stress is uneven. Third, there are too many debris remaining on the chip pad itself. The above situations will occur under the action of welding pressure and ultrasonic power, causing the aluminum layer of the pad to crack or even crater. "mentioned. Logitech talks endlessly about the root cause of the crater problem.

Erin looked at Logi with soft eyes, and her heart was full of good impressions of this father's former beloved general.

"Lao Luo, we have been developing copper wire technology for several months. Have you discovered any patterns?" Xin Tong turned around and asked.

"no!"

"For example, when the crater problem occurs, have you calculated that these craters all come from the same pad of the chip?" Xin Tong asked.

"We have calculated that the problem occurs randomly!"

"In this case, the crater problem has nothing to do with their position on the substrate. The second possibility you mentioned just now is eliminated!" Xin Tong reasoned.

Logitech nodded: "That's understandable!"

"Have you done Plasma Clean on these experimental chips before the experiment?" Xin Tong asked.

"Plasma Clean before the bonding process is our standard semiconductor packaging process!" Logitech said.

"Then please rule out the third possibility." Xin Tong said confidently.

After listening to Xin Tong's in-depth and simple analysis, Logi was so impressed that he fell into admiration.

Although I am very clear about the mechanism of the crater problem, most of it is just at the level of talking on paper.

Xin Tong is different. His look at the problem goes straight to the root of the problem.

At Ming Yueguang, although he was a bonding engineer, he was doing gold wire ball bonding. Gold wire is very soft, and there was never any concern about craters in bonding. Yu Hao, the king of heaven, was doing aluminum wire Wedge Bonding. Wires can also produce craters, and Logitech did some research on the crater problem when it was studying the aluminum wire process.

I didn’t expect that Xin Tong, who had never been exposed to aluminum wire and copper wire processes, could guide the analysis of copper wire process problems. It is really incredible.

"Boss Xin, your analysis is very thorough!"

"Brother, when I look at problems, I like to look at the essence through illusions!"

Logitech nodded.

Irene looked at Xin Tong with gentle eyes. At this moment, her sweetheart was like a god.

Xin Tong can easily be worth over [-] million and can easily be admitted to Tsinghua University. Xin Tong has abilities beyond ordinary people. "Lao Luo, it is not difficult to verify the first one. I believe you have done a lot of DOE verifications, and the results are definitely not ideal." If the results were ideal, Logitech would have loudly told the world that his copper wire process development was successful.

"Yes!" Logitech nodded,

"Then the root cause of the problem may not be your DOE, but the stability of our bonding machine is not enough. If the machine is unstable, your DOE verification will definitely fail!" Xin Tong's strong thinking ability allows him to see problems better than others.

Logi nodded. At this moment, he felt like kneeling down.

He knew Xin Tong very well. When he was in the bright moonlight, he was the No. 1 winner in the technician competition. At that time, he was in a high position and had not really seen Xin Tong's ability. Today was different.

I really learned a lesson today!
Xin Tong is like an old Chinese doctor who has gone through many vicissitudes of life, and he is very accurate in treating patients and taking the pulse.

Irene, a layman, also understood Xin Tong's words, and a smile appeared on her face.

It was right to choose Xin Tong.

It was the right choice to come to China.

The right person makes you feel like everything is right.

"Lao Luo, aren't you doing SPC analysis? See which bonding machine has better SPC data, and try using the copper wire process parameters on that machine!" Xin Tong said confidently.

Before there is data, Xin Tong's reasoning is nothing more than a conjecture.

"No. 8 bonding machine!" Logitech replied without thinking.

"Then do the verification on machine No. 8, Good Luck!" Xin Tong reached out and patted Logitech on the shoulder.

"Machine No. 8 is running out of goods. It will take half an hour to finish the Lot in hand. Boss Xin, in half an hour I will arrange to use the No. 8 bonding machine for verification!" Logitech said.

"Okay, let's go to the EOL workshop now!" Xin Tong finished speaking and walked ahead.

From the FOL workshop to the EOL workshop, you need to change the electrostatic clothing. Unlike the FOL workshop where only one pair of eyes can be exposed, the EOL workshop can see the entire face of the colleagues.

"It's not easy to keep the Molding workshop so clean!" Xin Tong said with emotion as soon as he walked into the EOL workshop.

"It's so hot in the workshop!" Irene frowned.

"Eileen, there are plastic sealing machines in here, and the mold temperature is several hundred degrees. Why isn't it hot?" Xin Tong said.

The loading and unloading of materials in the Molding process are all done manually. After each shot is completed, the workers will be extremely busy and sweating profusely.

Xin Tong watched the operators quietly. He suddenly remembered his years at Mingyueguang. After the new employee training, although he scored an unprecedented [-] points, he still became a new employee under the ruthless arrangements of the Personnel and Administration Department. Molding operator, Han Leng took him to the bonding process in the constant-temperature FOL workshop.

"Mr. Luo, is there any special job subsidy for Molding?" After a while, Xin Tong turned around and asked.

Logitech shook his head: "There were no subsidies before Wuji Semiconductor's acquisition! We continued to use the previous salary model."

"Lao Luo, we can't learn the management model of Taiwanese companies and earn the hard-earned money of operators. Starting from this month, we will increase the special job allowance of 200 yuan per month for operators in the Molding process!" Xin Tong patted Logitech shoulders.

"Ok!"