Research Areas
━ 04 / 04
Piezo-Phototronic Effects
Strain-induced piezoelectric and ferroelectric polarization is utilized to modulate carrier separation and transport, thereby controlling the photoresponse of flexible photodetectors.
━ 03 / 04
Flexible Self-powered Image Sensors
3D to quasi-2D Halide perovskites are engineered through bulky organic-cation, halide-anion, and dimensionality control to tune spectral response across the UV–vis range. These materials are incorporated into flexible self-powered image sensors for wavelength-selective photodetection, with f3dB exceeding 1 MHz at 0 V.
━ 02 / 04
NIR-SWIR CQD PDs
Colloidal quantum dots, including InSb, are investigated for broadband and SWIR photodetection through ligand-exchange and device-architecture engineering. Semi-transparent cells are also explored for integrated optoelectronic and imaging applications.
RESEARCH AREA I
Vis-to-SWIR Photodetectors
━ 01 / 04
AI-Assisted Engineering of Halide Perovskite PDs
3D Halide perovskite thin films are investigated for photodetection through AI-assisted process optimization. Strain engineering and nanoparticle-composite approaches are also explored to tune optoelectronic properties and improve device performance.
━ 04 / 04
Physiological Sensing
Physiological signals, including eyelid blinking, wrist bending, body motion, and Parkinsonian tremor, can be monitored using flexible self-powered sensing platforms. Pressure sensors can detect mechanical stimuli across a broad range, from subtle physiological signals to large deformations.
RESEARCH AREA II
Piezoelectric Energy Harvesters
━ 03 / 04
Electrospun Nanofiber-Based Textiles
Electrospun piezoelectric nanofibers are assembled into yarn and woven-fabric structures for flexible mechanical sensing and energy conversion. Fiber alignment, yarn architecture, and weave patterns are controlled to tune pressure sensitivity and electromechanical response.
━ 02 / 04
0–3 Type Nanocomposites
Inorganic nanoparticles, including PZT, BaTiO₃, halide perovskite nanocrystals, are dispersed in polymer (PVDF, P(VDF-TrFE), Ecoflex, PDMS, UV resin) or halide perovskite matrix to form 0–3 nanocomposites.
━ 01 / 04
Halide Perovskite Thin Films
ABX₃-type halide perovskite (A = MA, FA, or Cs; B = Pb or Sn; X = Cl, Br, or I) thin films are investigated for flexible piezoelectric energy harvesting. Bond lengths, bond angles, and distortion indexs are examined to elucidate the crystallographic origins of piezoelectricity and electromechanical response.
RESEARCH AREA III
Strain Engineering
━ 02 / 02
Strain-Driven Photoresponse
in Self-Powered Photodetectors
Tensile and compressive strain are used to tune the band structure, carrier separation, and transport of flexible halide perovskite photodetectors. Distinct strain-driven photoresponse mechanisms in p- and n-type devices are elucidated to realize high-performance self-powered photodetection.
━ 01 / 02
Anisotropic Lattice-Strain Engineering
In situ anisotropic strain is introduced into halide perovskite and oxide thin films during growth and processing. Out-of-plane lattice adjustments, octahedral tilting, and bond-length changes are quantified to correlate atomic-scale distortion with polarization, piezoelectricity, and mechanical flexibility.
RESEARCH AREA IV
Fracture Mechanics
━ 03 / 03
In situ strain engineering
In situ strain engineering is employed to actively tune residual tensile and compressive stress in thin films grown near room temperature, enabling strain to be precisely tailored as desired within a range of −1.2% to +1.2%. Through in situ strain engineering , high mechanical flexibility is achieved in inorganic thin films.
━ 02 / 03
Interlayer & Encapsulation Design
Graphene monolayer interlayers and transparent polymer encapsulation overlayers are introduced to suppress crack initiation and propagation. Neutral-plane positioning and interfacial adhesion are optimized to improve the bending durability of oxide and halide perovskite thin films.
━━ 01 / 03
Bending Fracture Analysis
of Flexible Inorganic Thin Films
Crack-onset strain, crack density, and fracture energy of inorganic thin films on polymer substrates are quantified through bending tests and fracture-mechanics models. These analyses establish design criteria for the mechanical reliability of flexible optoelectronic and energy devices.