Characterizing nanoscale spatiotemporal defects of multi-layered MoSe2 in hyper-temporal transient nanoscopy
Hwi Je Woo, Sung-Gyu Lee, Hansung Kim, Suyong Jung, Eun Seong Lee, Junghoon Jahng
TL;DR
The paper introduces a new nanoscopy technique to study defects in multi-layered MoSe2 at the nanoscale and femtosecond time scale, revealing how these defects affect optoelectronic properties.
Contribution
A novel hyper-temporal transient nanoscopy technique is developed to map nanoscale spatiotemporal defects in multi-layered MoSe2 with high precision.
Findings
Nanoscale strain-induced defects in MoSe2, such as nano-bubbles, reduce exciton-exciton annihilation rates due to strain-induced band distortion.
Topographically hidden defects like lattice mismatches create mid-gap states that trap charge carriers and slow recombination processes.
The new technique enables subwavelength mapping of spatiotemporal inhomogeneities in van der Waals materials.
Abstract
We directly characterize nanoscale spatiotemporal inhomogeneities of multi-layered molybdenum diselenide (MoSe2) in real space and time – the nanometre–femtosecond scale, attributing to local mechanical structures such as strain and surface/subsurface defects, which are critical in semiconductor and optoelectronic applications. This remarkable precision is achieved through the development of a hyper-temporal transient nanoscopy incorporating a sideband-coupled generalized lock-in amplification technique, allowing for characterization of local spatiotemporal defects at each pixel within a subwavelength mapping region. By utilizing this technique, we characterize the nanoscale strain-induced spatiotemporal defects of multi-layered MoSe2, including nano-bubbles that exhibit a noticeable reduction in exciton-exciton annihilation rates, which may attribute to the suppressed probability of…
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Taxonomy
Topics2D Materials and Applications · Perovskite Materials and Applications · Quantum Dots Synthesis And Properties