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Excellent film conductivity due to new printing technology
In a recent breakthrough reported by the Physicist Organization Network on June 2, American scientists have developed an innovative printing process that significantly outperforms traditional methods. This new technique is not only faster but also compatible with a wide range of organic materials, producing high-quality organic semiconductor films. Researchers from Stanford Linear Accelerator Center (SLAC) and Stanford University, supported by the U.S. Department of Defense, published their findings in *Nature Materials Science*, highlighting the potential for this advancement to spark a new revolution in organic electronics.
Organic electronic devices hold great promise across various industries, yet current best-performing films still suffer from poor electrical conductivity. To address this challenge, the research team introduced a novel printing method that results in films with ten times better conductivity than existing ones. These improved semiconductor films could be used in lightweight solar cells, flexible displays, and ultra-thin sensors—applications that are both cost-effective and energy-efficient.
Yan Ying, a postdoctoral researcher at SLAC and Stanford, emphasized the importance of the new method's scalability. “The key is that this approach can be adapted for industrial use,†she said. “This makes it more practical for real-world applications.â€
One of the main challenges in rapid printing is uneven ink distribution, which can lead to inconsistent film quality. Yan Ying tackled this issue by carefully controlling the flow of liquid solutions that dissolve organic materials. She designed a specialized printing blade embedded with tiny pillars—crystal structures—that helped create a uniform film.
To further enhance the quality, she introduced custom chemical patterns on the base of the blade. These patterns guided crystal growth, preventing the formation of irregular or "unruly" crystals. As a result, the team was able to produce large, well-aligned crystal strips—structures that allow for efficient charge transport.
Using the Stanford Synchrotron Radiation Lightsource (SSRL), the researchers conducted detailed X-ray studies of the resulting organic semiconductors. Based on these findings, they refined the method multiple times, ultimately proving that the crystals produced were not only 10 times more conductive but also structurally superior to those made using other techniques.
The team also tested the method with another organic material that had a completely different molecular structure. The results showed a significant improvement in film quality, suggesting that the technology has broad applicability across various materials.
Professor Baozhan Nan from the Stanford Institute for Materials and Energy Sciences and SLAC scientists Stefan and Mansfield, two other lead researchers, noted that the next step is to explore the relationship between materials and the printing process. They believe this discovery will enable better control over the electronic properties of printed materials, leading to optimized performance.
This groundbreaking work marks a major step forward in the field of organic electronics, paving the way for more advanced and versatile electronic devices in the future.