Purdue University Engineers have developed a patent-pendant method to synthesize high-quality, layered perovskite nanowires with large aspect ratios and turns organic-inorganic chemical compositions.
Letian Dou, the Charles Davidson Associate Professor of Chemical Engineering in the College of Engineering and Associate Professor of Chemistry, by Courtesy, Leads an International Team That Includes Postdoctoral Research Wenhao Shao and Graduate Research Assistant Jeong Hui Kim of the Davidson School Of Engineering.dou Said the Purdue Method Creates Layered Perovskite Nanowires With Exceptionally Well-Defined and Flexible Cavities that exhibit a wide rage of Unusual Optical Properties Beyond Conventional Perovskites.
“We observed anisotropic polarization emission, low-loss waveguiding below 3 decibels per millimeter and efficient low-threshold light amplification below 20 markeles per square centimeter,” he said. “This is due to the unique 2d quantum confinement inside the 1d nanowire as well as the greatly improved crystal quality.”
The Research has been published in Science ("Molecular Templating of Layered Halide Perovskite Nanowires"). Dou and his Team Disclosed Their Innovation to the Purdue Innovates Office of Technology commercialization, which has been applied for a patent from the us patent and trademark office to protect the intellectual property.
Purdue Method vs. Traditional Method
Shao Said Layered Metal Halide Perovskites, Commonly Called 2d Perovskites, can be synthesized in solution and their optical and electronic properies tuned by Changing Their Composition. They Easily Grow Into Large, Thin Sheets, But Growth of One-Dimensal Forms of the Materials is limited.
“Traditional Methods Like Vapor-Phase Growth or Lithographically Templated Solution Phase Growth Have High Processing Complexity and Cost,” He Said. “They also have limited scalabibility and design flexibility.”
Kim Said the Purdue Method Uses Organic Templating Molecules That Break The In-Plane Symmetry of Layered Perovskites and Induce One-Dimensal Growth Through Secondary Bonding Interactions.
“Specifically, these molecules introduce in-plane hydrogen bonding that is compatible with the ionic nature and octahedron spacing of halide perovskites,” she said. “Nanowires of Layered Perovskites COULD BE Readily Assembled with Tailorable Lengths and High-Quuality Cavities to Provide An Ideal Platform to Study LaSing, Light Propagation and Anisotropic Excitonic Behavors in Layered Perovskites.
Dou Said, “Our Approach Hightlights The Structural Tunability of Organic-Inorganic Hybrid Semiconductors, Which Also Brings Unpreceded Morphological Control to Layed Materials. This work really breaks the Boundary Between the traditional 1D and 2D nanomaterials, Combining Different Features Into One Material System and Opening Many New possibilities. ”
Next Development Steps
“This is just a start of an exciting new direction,” Dou Said. “We are Currently Developing New Compositions and Structures to Further Improve The Lasing Performance and Stability. We Are also Looking Into Large-Scale Patterning of These 1d Nanostructures To Build Integrated Photonic Tours. We are also interested in Partnering with Industry to Scale Up the Chemistry and Device Applications.