Researchers’ crystal engineering modifies 2D steel halide perovskites into 1D nanowires – Uplaza

Purdue College engineers have developed a patent-pending technique to synthesize high-quality, layered perovskite nanowires with giant facet ratios and tunable organic-inorganic chemical compositions.

Letian Dou, the Charles Davidson Affiliate Professor of Chemical Engineering within the School of Engineering and affiliate professor of chemistry, by courtesy, leads a global crew that features postdoctoral analysis assistant Wenhao Shao and graduate analysis assistant Jeong Hui Kim of the Davidson College of Chemical Engineering.

Dou stated the Purdue technique creates layered perovskite nanowires with exceptionally well-defined and versatile cavities that exhibit a variety of bizarre optical properties past standard perovskites.

“We observed anisotropic emission polarization, low-loss waveguiding below 3 decibels per millimeter and efficient low-threshold light amplification below 20 microjoules per square centimeter,” he stated. “This is due to the unique 2D quantum confinement inside the 1D nanowire as well as the greatly improved crystal quality.”

The analysis has been printed within the journal Science. Dou and his crew disclosed their innovation to the Purdue Innovates Workplace of Know-how Commercialization, which has utilized for a patent from the U.S. Patent and Trademark Workplace to guard the mental property.

New technique vs. conventional technique

Shao stated layered steel halide perovskites, generally referred to as 2D perovskites, will be synthesized in resolution and their optical and digital properties tuned by altering their composition. They simply develop into giant, skinny sheets, however progress of one-dimensional types of the supplies is restricted.

“Traditional methods like vapor-phase growth or lithographically templated solution phase growth have high processing complexity and cost,” he stated. “They also have limited scalability and design flexibility.”

Kim stated the Purdue technique makes use of natural templating molecules that break the in-plane symmetry of layered perovskites and induce one-dimensional progress by way of secondary bonding interactions.

“Specifically, these molecules introduce in-plane hydrogen bonding that is compatible with both the ionic nature and octahedron spacing of halide perovskites,” she stated. “Nanowires of layered perovskites could be readily assembled with tailorable lengths and high-quality cavities to provide an ideal platform to study lasing, light propagation and anisotropic excitonic behaviors in layered perovskites.”

Dou stated, “Our approach highlights the structural tunability of organic-inorganic hybrid semiconductors, which also brings unprecedented morphological control to layered 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.”

“This is just a start of an exciting new direction,” Dou stated. “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 circuits. We are also interested in partnering with industry to scale up the chemistry and device applications.”