Through innovations to a printing process, researchers have made major improvements to organic electronics -- a technology in demand for lightweight, low-cost solar cells, flexible electronic displays and tiny sensors¹. The printing method is fast and works with a variety of organic materials to produce semiconductors³ of strikingly higher quality than what has so far been achieved with similar methods. Organic electronics have great promise for a variety of applications, but even the highest quality films available today fall short in how well they conduct electrical current. The team from the U.S. Department of Energy's (DOE) SLAC National Accelerator Laboratory and Stanford University have developed a printing process they call FLUENCE -- fluid-enhanced crystal engineering -- that for some materials results in thin films capable of conducting electricity 10 times more efficiently⁴ than those created using conventional methods.

 

"Even better, most of the concepts behind FLUENCE can scale up to meet industry requirements," said Ying Diao, a SLAC/Stanford postdoctoral researcher and lead author of the study, which appeared today in Nature Materials.

 

Stefan Mannsfeld, a SLAC materials physicist⁵ and one of the principal investigators⁷ of the experiment, said the key was to focus on the physics of the printing process rather than the chemical makeup⁸ of the semiconductor². Diao engineered the process to produce strips of big, neatly⁹ aligned¹⁰ crystals that electrical charge can flow through easily, while preserving the benefits of the "strained lattice" structure and "solution shearing¹¹" printing technique previously¹² developed in the lab of Mannsfeld's co-principal investigator⁶, Professor Zhenan Bao of the Stanford Institute for Materials and Energy Sciences, a joint¹³ SLAC-Stanford institute.

 

To make the advance, Diao focused on controlling the flow of the liquid in which the organic material is dissolved. "It's a vital piece of the puzzle," she said. If the ink flow does not distribute evenly, as is often the case during fast printing, the semiconducting crystals will be riddled¹⁴ with defects. "But in this field there's been little research done on controlling fluid flow."

 

Diao designed a printing blade with tiny pillars embedded¹⁵ in it that mix the ink so it forms a uniform film. She also engineered a way around another problem: the tendency of crystals to randomly¹⁶ form across the substrate. A series of cleverly designed chemical patterns on the substrate suppress the formation of unruly crystals that would otherwise grow out of alignment¹⁷（失准） with the printing direction. The result is a film of large, well-aligned crystals.

 

X-ray studies of the group's organic semiconductors at the Stanford Synchrotron Radiation Lightsource (SSRL) allowed them to inspect their progress and continue to make improvements, eventually showing neatly arranged crystals at least 10 times longer than crystals created with other solution-based techniques, and of much greater structural¹⁸ perfection.

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