Thi-Anh Nguyen

@article{Nguyen2025b,

title = {Ag Nanowire-Integrated MoS2/ZnO Heterojunctions for Highly Efficient Photogenerated Charge Transfer},

author = {Anh Thi Nguyen and Jungyoon Cho and Malkeshkumar Patel and Duc Anh Vu and Jungeun Song and Dongseok Suh and Ambrose Seo and Joondong Kim and Dong-Wook Kim},

url = {https://doi.org/10.1002/aelm.202400744},

doi = {10.1002/aelm.202400744},

issn = {2199-160X},

year  = {2025},

date = {2025-03-18},

urldate = {2025-03-18},

journal = {​Advanced Electronic Materials},

number = {2400744},

abstract = {The integration of silver nanowire (AgNW) networks with MoS2/ZnO heterojunctions leads to a remarkable enhancement in surface photovoltage (SPV) response. In the visible wavelength range, the heterojunctions with AgNWs achieve an SPV signal of ≈200 mV, a fourfold increase compared to the counterparts without AgNWs (≈50 mV). Wavelength-dependent nanoscopic SPV mapping suggests that this enhancement originates from efficient charge transfer between MoS2 and ZnO. Moreover, the embedded AgNWs raise the local electric potential at the MoS2 surface by several tens of mV, thereby facilitating the collection of photogenerated electrons. Optical calculations reveal that AgNWs concentrate incident light in neighboring layers across a broad wavelength range, further boosting photocarrier generation. These results, along with photoluminescence spectra, suggest that photocarrier transfer at the MoS2/ZnO heterointerfaces is significantly enhanced due to the synergistic effects of light concentration, local potential modifications, and improved electric conduction caused by the AgNW networks.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Nguyen2023,

title = {High-Performance and Lithography-Free Au/WS2/Ag Vertical Schottky Junction Solar Cells},

author = {Anh Thi Nguyen and Jun Wang and Eunseo Cho and Seoyoung Lim and Soyeong Kwon and Jungeun Song and Keya Zhou and Dong-Wook Kim},

url = {https://advanced.onlinelibrary.wiley.com/doi/10.1002/admi.202300031},

doi = {10.1002/admi.202300031},

issn = {2196-7350},

year  = {2023},

date = {2023-04-18},

urldate = {2023-04-18},

journal = {Advanced Materials Interfaces},

volume = {10},

number = {2300031},

issue = {15},

abstract = {Due to their extraordinarily large optical absorption coefficients, transition metal dichalcogenides (TMDs) are gaining more and more attention for photovoltaic applications. Improving the device performance of a TMD solar cell requires an optimal device architecture and reliable fabrication processes. Metal/WS2-multilayer/metal heterojunctions are fabricated using lithography-free processes. 20 nm thick WS2 flakes are exfoliated on template-stripped Ag bottom electrodes, and then 10 nm thick Au top electrodes with a diameter of 2 µm are evaporated on the WS2 surface using holey carbon films as shadow masks. Current-sensing atomic force microscope measurements reveal that the Au/WS2/Ag devices exhibit prominent rectifying characteristics, indicating the formation of Schottky diodes. The power conversion efficiency of the Schottky junction is as high as 5.0%, when illuminated by a light-emitting diode with a peak wavelength of 625 nm and a power density of 2.5 mW cm−2. These devices also possess broadband and incident-angle-insensitive absorption capability due to the very large refractive indices and extremely small thickness of the WS2 flakes. The simple fabrication procedures proposed in this work demonstrate high-performance and high-yield TMD photovoltaic devices.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Nguyen2022,

title = {Self-Hybridized Exciton-Polaritons in Sub-10-nm-Thick WS2 Flakes: Roles of Optical Phase Shifts at WS2/Au Interfaces},

author = {Nguyen, A. T. and Kwon, S. and Song, J. and Cho, E. and Kim, H. & Kim, D.-W. },

url = {https://doi.org/10.3390/nano12142388},

doi = {10.3390/nano12142388},

issn = {2079-4991​},

year  = {2022},

date = {2022-07-13},

urldate = {2022-07-13},

journal = {Nanomaterials},

volume = {12},

number = {2388},

issue = {14},

abstract = {Exciton–polaritons (EPs) can be formed in transition metal dichalcogenide (TMD) multilayers sustaining optical resonance modes without any external cavity. The self-hybridized EP modes are expected to depend on the TMD thickness, which directly determines the resonance wavelength. Exfoliated WS2 flakes were prepared on SiO2/Si substrates and template-stripped ultraflat Au layers, and the thickness dependence of their EP modes was compared. For WS2 flakes on SiO2/Si, the minimum flake thickness to exhibit exciton–photon anticrossing was larger than 40 nm. However, for WS2 flakes on Au, EP mode splitting appeared in flakes thinner than 10 nm. Analytical and numerical calculations were performed to explain the distinct thickness-dependence. The phase shifts of light at the WS2/Au interface, originating from the complex Fresnel coefficients, were as large as π/2 at visible wavelengths. Such exceptionally large phase shifts allowed the optical resonance and resulting EP modes in the sub-10-nm-thick WS2 flakes. This work helps us to propose novel optoelectronic devices based on the intriguing exciton physics of TMDs.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}