Distortion Evolution of Two-Dimensional Molecular Crystals for Branched Optical Waveguides

Area of Science:

• Materials Science
• Nanotechnology
• Optoelectronics

Background:

• Two-dimensional (2D) molecular crystals with irregular shapes are key for multifunctional optoelectronics.
• The influence of crystal distortion on these irregular morphologies remains under-explored.
• Understanding this relationship is crucial for engineering enhanced crystal functionalities.

Purpose of the Study:

• To develop a novel synthesis strategy for 2D molecular crystals with diverse irregular morphologies.
• To investigate the impact of crystal distortion on morphological evolution.
• To explore the optoelectronic properties and applications of these engineered crystals.

Main Methods:

• A competitive facet-selective growth strategy was employed.
• Controlled deposition on high attachment energy facets drove structural distortion.
• Morphological evolution from compass shapes to branched wires was observed.

Main Results:

• Synthesis of 2D molecular crystals with irregular shapes, including rhombus sheets and distorted compass shapes.
• Rhombus microsheets demonstrated 2D optical waveguides with low loss (0.02 dB/μm).
• Compass sheets achieved focused directional emission, and T-like branches enabled bidirectional waveguides for photonic switching.

Conclusions:

• The study presents a viable method for synthesizing unusual 2D molecular crystal morphologies.
• Crystal distortion is a key factor in controlling irregular crystal structures and their properties.
• The findings pave the way for developing next-generation optoelectronic devices with tailored functionalities.