arXiv subjects

Jaehoon Ji

Publications and source records attributed to Jaehoon Ji.

2 recordsLinked to original sources

arXiv2025

Tunable Photodetectors Based on 2D Hybrid Structures from Transition Metal Dichalcogenides and Photochromic Molecules

This article reviews recent progress in two-dimensional (2D) hybrid structures that integrate transition metal dichalcogenides (TMDs) with photochromic molecules for photodetector applications. Atomically thin TMD semiconductors offer strong light-matter interaction, tunable bandgaps, and efficient carrier transport, making them suitable for photodetectors. Photochromic molecules, capable of reversible structural changes in response to external light, can modulate their chemical, optical, and electronic properties. The combinations of various light-adaptive compounds and TMDs provide a versatile platform to explore optically programmable behaviors such as wavelength-selective photoresponse, nonvolatile switching, and multilevel memory characteristics. TMD/photochromic hybrids offer new functional capabilities that are difficult to achieve with either component alone. This mini-review summarizes material properties, interfacial integration strategies, working mechanisms, and representative device demonstrations. We conclude by highlighting future research directions toward the practical implementation of photoresponsive hybrid systems in high-performance adaptive optoelectronics.

cond-mat.mes-hall↗

arXiv2021

Understanding the Effects of Dielectric Property, Separation Distance, and Band Alignment on Interlayer Excitons in 2D Hybrid MoS2/WSe2 Heterostructures

Two dimensional (2D) van der Waals heterostructures from transition metal dichalcogenide (TMDC) semiconductors show a new class of spatially separate excitons with extraordinary properties. The interlayer excitons (XI) have been studied extensively, yet the mechanisms that modulate XI are still not well understood. Here, we introduce several organic-layer-embedded hybrid heterostructures, MoS2/organic/WSe2, to study the binding energy of XI. We discover that the dielectric screening of the quasi-particle is reduced with organic molecules due to decreased dielectric constant and greater separation distance between the TMDC layers. As a result, a distinct blueshift is observed in interlayer emission. We also find that the band alignment at the heterointerface is critical. When the organic layer provides a staggered energy state, interlayer charge transfer can transition from tunneling to band-assisted transfer, further increasing XI emission energies due to a stronger dipolar interaction. The formation of XI may also be significantly suppressed with electron or hole trapping molecules. These findings should be useful in realizing XI-based optoelectronics.

cond-mat.mtrl-sci↗