Selected Publications

- 2024

• Spectroscopic studies of pyrochlore high entropy oxide materials, in preparation.

• Raman scattering study of oxygen defects in CoNb2O6 nanofibers, in preparation.

• Laser Scribing for Perovskite Solar Modules of Long-Term Stability, accepted for publication in Solar RRL. 

• Boosted triboelectric output performance in g-C3N4 embedded P(VDF-TrFE) composite via a coupling of photocarrier and ferroelectric dipole, Nano Energy 122, 129320 (2024).   

- 2023

• Enhancing open circuit voltage and long-term stability of perovskite solar module by laser scribing, submitted.  

• Facile synthesis of highly crystalline single phase CoNb2O6 nanofibers at low temperature and their structural characterizations, Cryst. Growth Des. 6, 4395 (2023).

- 2022

• Exciton Transfer at Heterointerfaces of MoS2 Monolayers and Fluorescent Molecular Aggregates,  Adv. Sci. 2201875 (2022).

• Parallel alignment of methylammonium cations in orthorhombic CH3NH3PbCl3 single crystal observed by polarized micro-Raman scattering spectroscopy, Chem. Mater. 34, 2972 (2022).

- 2021

• High speed growth of MAPbBr3 single crystals via low-temperature inverting solubility: enhancement of mobility and trap density for photodetector applications, Nanoscale 13, 8275 (2021).

• Exotic optoelectronic behaviors in  CH3NH3PbCl3 perovskite single crystals: Co-existence of free and bound excitons with structural phase transitions, Appl. Phys. Lett. 118, 143301 (2021).

• Enhanced Optical Absorption in Conformally Grown MoS2 Layers on SiO2/Si Substrates with SiO2 Nanopillars with a Height of 50 nm, Nanoscale Adv. 3, 710 (2021).

• Correlation between Symmetry and Phase Transition Temperature of VO2 Films Deposited on Al2O3 Substrates with Various Orientations, Adv. Electron. Mater. 2000874 (2021).

- 2020

• A Laterally Overgrown GaN Thin Film Epitaxially Separated from but Physically Attached to an SiO2‑Patterned Sapphire Substrate, Cryst. Growth Des. 20, 6198 (2020).

• Vertically-Oriented WS2 Nanosheets with a Few Layers and Its Raman Enhancements, Nanomaterials 10, 1847 (2020).

• Raman scattering studies of the structural phase transitions in single crystalline CH3NH3PbCl3, J. Phys. Chem. Lett.  11, 3773 (2020).

• Photo-response in 2D metal chalcogenide-ferroelectric oxide heterostructure controlled by spontaneous polarization, J. Mater. Chem. C 8, 3724 (2020). 

• Sodium-assisted passivation of grain boundaries and defects in Cu2ZnSnSe4 thin films, Phys. Chem. Chem. Phys. 22, 7597 (2020).

• Internal Fields in Multilayer WS2/MoS2 Heterostructures Epitaxially Grown on Sapphire Substrates, Phys. Status Solidi A, 2000033  (2020).

• Carrier transport and surface potential over phase variations in the surface and bulk of highly efficient Cu2ZnSn(S,Se)4 solar cells, Prog. Photovolt. 28, 382 (2020).

• Unraveling interface characteristics of Zn(O,S)/Cu(In,Ga)Se2 at nanoscale: Enhanced hole transport by tuning band offsets, Appl. Surf. Sci. 509, 144782 (2020).

- 2019

• Quantum Confinement Induced Excitonic Mechanism in Zinc-Oxide-Nanowalled Microrod Arrays for UV−Vis Surface-Enhanced Raman Scattering, J. Phys. Chem. C 123, 24957 (2019).

• A simple and robust route toward flexible CIGS photovoltaic devices on polymer substrates: Atomic level microstructural analysis and local opto-electronic investigation, Solar Energy Mater. Solar Cells 195, 280 (2019).

• Phase formation and local charge transport of lead-free CH3NH3Sn(I1-xBrx)3 (0 ≤ x ≤ 1) perovskite solar cells fabricated by solvent optimization,  Solar Energy 186, 136 (2019).

• Study of Chemical Enhancement Mechanism in Non-plasmonic Surface Enhanced Raman Spectroscopy (SERS), Front. Chem. 7, 582 (2019).

• Direct observation of quantum tunnelling charge transfers between molecules and semiconductors for SERS, Nanoscale 11, 45 (2019). 

-2018

• Abnormal phase flip in the coherent phonon oscillations of Ca2RuO4,  Phys. Rev. B 98, 161115 (2018).  

• Low temperature growth of amorphous VO2 films on flexible polyimide substrates with a TiO2 buffer layer, J. Vac. Sci. Tech. A 36 (2018). 

• Interference-Enhanced Broadband Absorption of Monolayer MoS2 on Sub-100 nm Thick SiO2/Si Substrates: Reflection and Transmission Phase Changes at Interfaces, Adv. Mater. Interfaces 5, 1701637 (2018).

• MoS2 monolayers on Si and SiO2 nanocone arrays: influences of 3D dielectric material refractive index on 2D MoS2 optical absorption, Nanoscale 10, 18920 (2018). 

• Single Phase Formation of SnS Competing with SnS2 and Sn2S3 for Photovoltaic Applications: Optoelectronic Characteristics of Thin-Film Surfaces and Interfaces, J. Phys. Chem. C 122, 3523 (2018).

• Surface potential mapping and n-type conductivity in organic-inorganic lead iodide crystals, CrystEngComm 20, 6551 (2018).

• Strong Nonlinear Optical Response in the Visible Spectral Range with Epsilon-Near-Zero Organic Thin Films, Adv. Optical Mater. 6, 1701400 (2018).

-2017

• Band Alignment at Au/MoS2 Contacts: Thickness Dependence of Exfoliated Flakes, J. Phys. Chem. C 121, 22517 (2017).

• Broad-Band Photocurrent Enhancement in MoS2 Layers Directly Grown on Light-Trapping Si Nanocone Arrays, ACS Appl. Mater. Inter. 9, 6314 (2017).

• Growth of two-dimensional rhenium disulfide (ReS2) nanosheets with a few layers at low temperature , CrystEngComm 19, 5341 (2017).

• High photo-conversion efficiency in double-graded Cu(In,Ga)(S,Se)2 thin film solar cells with two-step sulfurization post-treatment, Prog. Photovolt: Res. Appl. 25, 139 (2017). 

• Optical and Scanning Probe Identification of Electronic Structure and Phases in CH3NH3PbBr3 Crystal , J. Phys. Chem. C 121, 21930 (2017).

• Strain-induced non-linear optical characteristics of pyroelectric PbVO3 epitaxial thin films, Opt. Mater. Exp. 7, 62 (2017).

-2016 and before

• Electrical and Optical Properties of VO2 Thin Films Grown on Various Sapphire Substrates by Using RF Sputtering Deposition, J. Kor. Phys. Soc. 69, 1787 (2016). 

• Identification of marcasite in pyrite FeS2 thin films and the films' carrier transport characteristics, RSC Adv. 6, 81394 (2016).

• Microstructural investigation of phases and pinning properties in MBa2Cu3O7-x (M=Y and/or Gd) coated conductors produced by scale-up facilitie, Supercond. Sci. Technol. 29, 035016 (2016).

• Enhancement of photo-conversion efficiency in Cu2ZnSn(S,Se)4 thin-film solar cells by control of ZnS precursor-layer thickness, Prog. Photovolt: Res. Appl. 24, 292 (2016). 

• Optical and surface probe investigation of secondary phases in Cu2ZnSnS4 films grown by electrochemical deposition, SOLMAT 139, 10 (2015). 

• Raman scattering studies of Cu2ZnSnS4 thin films: Local distribution of the secondary phase Cu2-xS and the effect of KCN etching on Cu2-xS, J. Kor. Phys. Soc. 66, 117 (2015).

• Raman scattering studies of the lattice dynamics in layered MoS2, J. Kor. Phys. Soc. 66, 1575 (2015).

• Coexistence of piezoelectricity and electric conduction in oxygen-deficient NaNbO3-d sub-micron cubes, Mater. Sci. Eng. B 182, 81 (2014).

• Effects of Cu2-xS phase removal on surface potential of Cu2ZnSnS4 thin-films grown by electroplating, Curr. Appl. Phys. 14, 1665 (2014).

• Giant enhancement of the Raman response due to one-dimensional ZnO nanostructures, Nanoscale 6, 14622 (2014).

• Probing the Growth Habit of Highly Single Crystalline Twinned V-Shape RuO2 Nanowires by Polarized Raman Scattering, J. Phys. Chem. C 118, 20716 (2014). 

• Quintuple layer Bi2Se3 thin films directly grown on insulating SiO2 using molecular beam epitaxy, Appl. Surf. Sci. 316, 42 (2014). 

• Structural properties and phase formation of epitaxial PbVO3 thin films grown on LaAlO3 (001) by pulsed laser deposition, J. Phys. D-Appl. Phys. 47, 245302 (2014).

• Sulfur-doped graphene as a potential alternative metal-free electrocatalyst and Pt-catalyst supporting material for oxygen reduction reaction, Phys. Chem. Chem. Phys. 16, 103 (2014).

• Configuration-controlled Au nanocluster arrays on inverse micelle nano-patterns : versatile platforms for SERS and SPR sensors, Nanoscale 5, 12261 (2013). 

• Hierarchically assembled 1-dimensional hetero-nanostructures: Single crystalline RuO2 nanowires on electrospun IrO2 nanofibres, CrystEngComm 15, 2367 (2013). 

• Structural and optical properties of phase-change amorphous and crystalline Ge1-xTex (0 < x < 1) thin films, Physica Status Solidi (A) 210, 267 (2013). 

• Graphene as a highly efficient template for growing one-dimensional RUO2 nanostructures, Crystal Growth and Design 12, 3829 (2012).

• Graphitic carbon growth on MgO(100) by molecular beam epitaxy, J. Phys. Chem. C 116, 7380 (2012).  

• Highly single crystalline IrxRu1-xO2 mixed metal oxide nanowires, J. Phys. Chem. C 116, 16300 (2012).

• Synthesis of vertical arrays of ultra long ZnO nanowires on noncrystalline substrates, Mater. Sci. Eng. B 177, 132 (2012).

• Effect of hydroxyl group on global and local structures of hydrothermally grown KNbO3 nanorods, Mater. Chem. Phys. 129, 1071 (2011).

• Nanocrystalline graphite growth on sapphire by carbon molecular beam epitaxy, J. Phys. Chem. C 115, 4491 (2011).

• The fabrication of graphitic thin films with highly dispersed noble metal nanoparticles by direct carbonization of block copolymer inverse micelle templates, Carbon 49, 2120 (2011).

• Visible-light active nanohybrid TiO2/carbon photocatalysts with programmed morphology by direct carbonization of block copolymer templates, Green Chem. 13, 3397 (2011).

• Possible role of hydroxyl group on local structure and phase transition of KNbO3 and KTaO3 nanocrystals,  Physica B 405, 4866 (2010).

• Polarization dependence of Raman scattering of a single RuO2 nanowire, Appl. Phys. Lett. 96, 213108 (2010).

• Photogenerated plasmons in GaAs1-xBix, Appl. Phys. Lett. 91, 82101 (2007).

• Fully reflective deep ultraviolet to near infrared spectrometer and entrance optics for resonance Raman spectroscopy, Rev. Sci. Inst. 76, 073107 (2005). 

• Resonant Raman scattering spectroscopy studies of GaP1-xNxand GaAs1-xNxin the ultra-violet energy range, Phys. Rev. B 71, 155208 (2005).

• Stress measurement in sub-90-nm transistor architecture, IEEE Trans. Elect. Dev. 51, 1740 (2004).

• Evolution of electronic states in GaAs1-xNxprobed by resonant Raman spectroscopy, Phys. Rev. B 68, 233201 (2003).

• Evolution of electronic states in GaP1-xNx, Phys. Rev. B 67, 235209 (2003). 

• Lattice dynamics and charge-ordering in La1-xCaxMnO3, Phys. Rev. B 65, 092401 (2002).

• Raman scattering study of anomalous charge-, spin-, and lattice-dynamics in the charge-ordered phase of Bi1-xCaxMnO3(x>0.5), Phys. Rev. Lett. 85, 3297 (2000).

• Anisotropic optical signatures of orbital and charge ordering in Bi1-xCaxMnO3, Phys. Rev. B 62, R4782 (2000).

• Raman-scattering study of the charge and spin dynamics of the layered ruthenium oxide Ca3Ru2O7, Phys. Rev. B 60, R6980 (1999).

• Probing anisotropic magnetotransport in manganese perovskites using Raman spectroscopy, Phys. Rev. B 58, R10115 (1998). 

• Raman and optical spectroscopic studies of small-to-large polaron crossover in the perovskite manganese oxides, Phys. Rev. B 58, 2795 (1998).

• Spectroscopic study of bound magnetic polaron formation and the metal-semiconductor transition in EuB6, Phys. Rev. B 56, 2717 (1997).