180 microns! He cut out the world's thinnest silicon wafer

In a Baoding Yingli Group wafer workshop, 29-year-old Han Wei has become a standout figure in the photovoltaic industry. Using a 140-micron steel wire, he can slice through silicon wafers as delicately as cutting hair. His work has contributed to an impressive annual profit of 168 million yuan for the company, and this year, he was honored with the National May 1st Labor Medal—the first recipient from the photovoltaic sector in China. The key to his success lies in the precision of his work. By reducing the thickness of silicon wafers by 20 micrometers—from 200 to 180 microns—each saw can now produce 4,800 wafers instead of 4,200, significantly increasing efficiency and saving valuable materials. This breakthrough is not just a technical achievement but also a major financial gain for the company. When I met Han Wei at the workshop on May 26, he was working on a Swiss-made HCT-B5 wire saw machine, handling a 140-micron steel wire that is incredibly delicate. With steady hands, he carefully adjusted the wire, ensuring it was perfectly aligned before winding it onto the machine. “Every cut matters,” he said. “The quality of each wafer depends on this line.” Han Wei’s deep understanding of the process comes from years of observation and refinement. He and his team worked late into the night, optimizing procedures and testing different methods. Their efforts led to a breakthrough that pushed the limits of silicon wafer technology. Tackling such thin wafers is no easy task. Silicon is extremely fragile, and even the slightest mistake during cutting can lead to breakage or misalignment. Han Wei explained that challenges like “jumpers” and “cutting skews” were common. To solve these issues, he made small but effective improvements, such as adding filters to remove impurities and modifying imported parts to better suit the cutting process. After successful trials, the new procedure was implemented across the plant. This required extensive data collection and testing over six months, which Han Wei and his team carried out diligently. Their hard work paid off, and the results were remarkable. Despite his success, Han Wei’s journey wasn’t straightforward. He studied network technology and information processing, a field far removed from the photovoltaic industry. He joined Yingli Group in 2007 after a recruitment event at his college, initially unsure about his role. “At first, I wasn’t comfortable with the noise and the environment,” he admitted. But he quickly adapted, driven by his mother’s advice: “No matter what you do, work hard and don’t fear hardship.” He threw himself into his job, learning from others and taking initiative when problems arose. Whether it was fixing a broken machine or solving a technical issue, he always gave his best. Over time, his dedication earned him recognition, including the title of “Chief Employee” at Yingli and the prestigious National May 1st Labor Medal. Today, Han Wei is not only a top performer but also a mentor to others. He has helped develop several outstanding employees, some of whom have risen to leadership positions. “Everyone can achieve their own success through hard work,” he said. “It’s all about passion, perseverance, and dedication.”

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