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Enhancing Photodetection Ability of MoS2 Nanoscrolls via Interface Engineering.
Jun Su1,2, Xin Li1,2, Minxuan Xu1,2
1Center for Advanced Optoelectronic Materials, College of Materials and Environmental Engineering, Hangzhou Dianzi University (HDU), Hangzhou 310018, China.
ACS Applied Materials & Interfaces
|January 3, 2023
Summary
Researchers created 1D molybdenum disulfide (MoS2) nanoscrolls and combined them with barium titanate (BaTiO3) nanoparticles. This BaTiO3/MoS2 hybrid structure significantly enhances light sensing performance in optoelectronic devices.
Area of Science:
- Materials Science
- Nanotechnology
- Condensed Matter Physics
Background:
- Two-dimensional (2D) van der Waals semiconductors offer flexibility beyond traditional lattice-matching constraints.
- Extending van der Waals materials to one-dimensional (1D) structures, like nanoscrolls, presents unique physical properties due to non-covalent bonding.
- The impact of lattice curvature in 1D rolled structures on optoelectronic properties and device performance is not well understood.
Purpose of the Study:
- To investigate the optoelectronic properties of molybdenum disulfide (MoS2)-based nanoscrolls.
- To explore the use of a 0D/1D (BaTiO3/MoS2) strategy to tune optoelectronic properties and enhance light sensing.
- To understand how lattice curvature in MoS2 nanoscrolls affects their performance.
Main Methods:
- Fabrication of MoS2 nanoscrolls using an alkaline solution-assisted method, leveraging capillary forces for spontaneous rolling.
- Integration of 0D barium titanate (BaTiO3) particles within the 1D MoS2 nanoscrolls.
- Characterization using transmission electron microscopy (TEM), micro-Raman spectroscopy, and photoluminescence.
- Evaluation of photodetection performance of bare MoS2 nanoscrolls and BaTiO3/MoS2 hybrid nanoscrolls.
Main Results:
- Bare MoS2 nanoscrolls exhibit reduced photoresponse compared to planar structures, attributed to lattice curvature.
- BaTiO3/MoS2 nanoscrolls demonstrate significantly improved photodetection responsivity (73.9 A/W) compared to bare nanoscrolls (1.1 A/W) and 2D MoS2 (1.5 A/W) at 470 nm.
- Enhanced performance is likely due to carrier extraction/injection between BaTiO3 and MoS2.
Conclusions:
- Lattice curvature in 1D MoS2 nanoscrolls negatively impacts photoresponse.
- The 0D/1D BaTiO3/MoS2 hybrid nanoscroll strategy effectively enhances optoelectronic properties, particularly photodetection.
- This work offers insights into 1D van der Waals materials and presents a method for fabricating high-performance 1D optoelectronic devices.
