Rhodamine 6G/Transition Metal Dichalcogenide Hybrid Nanoscrolls for Enhanced Optoelectronic Performance

Area of Science:

• Materials Science
• Nanotechnology
• Optoelectronics

Background:

• Two-dimensional transition metal dichalcogenide (TMDC) nanosheets have low light absorption efficiency, limiting their use in optoelectronic devices.
• One-dimensional (1D) TMDC nanoscrolls offer improved properties, especially when combined with photoactive materials.

Purpose of the Study:

• To enhance the optoelectronic performance of TMDC nanoscrolls.
• To investigate the effect of wrapping photoactive organic dye rhodamine (R6G) into TMDC nanoscrolls.

Main Methods:

• Depositing R6G molecules onto monolayer TMDC nanosheets via a solution method.
• Preparing R6G/MoS2 nanoscrolls by dropping an ammonia and ethanol solution onto R6G/MoS2 nanosheets.
• Characterizing the R6G/MoS2 nanoscrolls using optical microscopy, AFM, Raman spectroscopy, and TEM.

Main Results:

• Successfully prepared R6G/MoS2 nanoscrolls with lengths up to hundreds of microns.
• Confirmed the encapsulation of R6G within the MoS2 nanoscrolls.
• Observed multiple type II heterojunction interfaces promoting photo-induced carrier generation and separation.
• Achieved significant enhancements in photoresponsivity (66.07 A/W), carrier mobility (132.93 cm2V-1s-1), external quantum efficiency (20,261%), and detectivity (1.25 × 1012 cm·Hz1/2W-1).

Conclusions:

• R6G/TMDC hybrid nanoscrolls demonstrate significantly improved optoelectronic performance compared to monolayer MoS2 nanosheets.
• The type II heterojunctions and rapid electron transport along the nanoscroll axis are key to enhanced light absorption and photoresponse.
• R6G/TMDC hybrid nanoscrolls show promise as materials for high-performance optoelectronic devices.