APFM LABApplied Physics of Functional Materials기능성소재응용물리연구실 · 아주대학교
Home › Research

Research

Functional Materials: from Structure–Property Relationships to Device Applications기능성 소재: 구조–물성 상관관계에서 소자 응용까지

1. Fundamental Research기초연구

  • Charge Dynamics전하 및 이온 동역학 / 들뜬 상태 동역학
  • Charge Transport전하 수송 특성

Photophysics and device physics as common tools to understand how excitons, charges and ions behave in functional materials.

2. Applied Research응용연구

  • Organic & Perovskite Solar Cells유기 및 페로브스카이트 태양전지
  • Graphene Quantum Dot Light-Emitting Materials그래핀 양자점 기반 발광 소재
  • Organic Photodiodes (OPDs)유기 포토다이오드
  • OECTs & Biosensors (incl. Olfactory Sensors)유기 전기화학 트랜지스터 및 바이오센서 (후각 센서 포함)
Fundamental Research

Charge Dynamics

전하 및 이온 동역학 / 들뜬 상태 동역학

Time-resolved spectroscopy (fs–μs transient absorption, TRPL, TPV/TPC, charge extraction) to track excitons, polarons, and triplets from femtoseconds to seconds.

  • Exciton diffusion, charge transfer and dissociation in donor/acceptor blends
  • Triplet formation, photo-oxidation and long-term stability of organic semiconductors
  • Trap-assisted (SRH) vs. radiative recombination in halide perovskites; ion migration and hysteresis
  • Voltage-loss analysis: quasi-Fermi-level splitting, ideality factor and non-radiative losses
Fundamental Research

Charge Transport

전하 수송 특성

Correlating macroscopic (SCLC) and local (conductive AFM) charge transport with crystallinity, chain orientation and phase-separated morphology of conjugated polymer films.

  • Conjugated polymer / insulating polymer blends with enhanced hole mobility
  • In-situ absorption during film formation, GIWAXS and DSC to follow aggregation and orientation
  • Kinetically controlled phase separation and molecular doping (e.g., CO2 doping)
  • Design rules linking backbone rigidity and π-stacking to mobility
Applied Research

Organic & Perovskite Solar Cells

유기 및 페로브스카이트 태양전지

Understanding and minimizing efficiency-limiting factors, from grain-size control of perovskites to fill-factor engineering in nonfullerene and all-polymer organic photovoltaics.

  • Nonfullerene / all-polymer solar cells: charge collection vs. recombination
  • Ternary blends and self-assembled molecular interfaces for lower voltage loss
  • Lead-free Sn-based, Sn–Pb tandem and bio-templated (M13 bacteriophage) perovskite solar cells
  • Semi-transparent photovoltaics for all-day smart windows
Applied Research

Graphene Quantum Dot Light-Emitting Materials

그래핀 양자점 기반 발광 소재

Photophysics of graphene quantum dots and related luminescent nanomaterials for robust, low-toxicity light-emitting materials and anti-counterfeiting surfaces.

  • Radiative / non-radiative decay pathways and PLQY optimization
  • Luminescence quenching mechanisms of quantum dots under harsh conditions
  • Triplet–triplet annihilation and voltage up-conversion emission
Applied Research

Organic Photodiodes (OPDs)

유기 포토다이오드

Narrow-band and broadband organic photodetectors with low dark current and fast response, guided by charge-generation and trap analysis.

  • Bulk vs. interfacial charge generation in single- and multi-component active layers
  • Dark-current suppression via interface engineering
  • Toward image sensors and wearable optical sensing
Applied Research

OECTs & Biosensors (incl. Olfactory Sensors)

유기 전기화학 트랜지스터 및 바이오센서 (후각 센서 포함)

Mixed ionic–electronic conduction in conjugated polymers for organic electrochemical transistors and bio-interfaced sensors.

  • Side-chain engineering for high μC* and stable operation in electrolytes
  • Bio-recognition layers (e.g., M13 phage) on semiconductor surfaces via self-assembled monolayers
  • Olfactory (odorant) and glucose biosensing platforms; microfluidic nucleic-acid extraction chips
Methods

Experimental Techniques

Spectroscopic, microscopic and electrical tools we use to connect materials structure with device performance.

Transient Absorption (fs–μs)Excited-state and charge-carrier dynamics
Time-Resolved PL / PLQYRadiative vs. non-radiative decay, exciton lifetime
TPV · TPC · Charge ExtractionCarrier lifetime and density under operating conditions
Electroabsorption SpectroscopyPolarizability and delocalization of excited states
Conductive AFM & SCLCLocal and macroscopic charge transport
GIWAXS / In-situ AbsorptionCrystallinity, orientation and film-formation kinetics
DLCP / ImpedanceTrap density mapping and ionic response
Device Fabrication & J–V / EQESolar cells, photodiodes, OECTs, up-conversion devices
Collaboration

Collaborative Research

Beyond optoelectronics, our photophysical and device-analysis expertise supports collaborative projects with partners in Korea, Japan and China.

Energy Storage MaterialsCathodes for aqueous Zn/Mn-ion, Al-ion and Co-free Li-ion batteries (Small 2025, Battery Energy 2025, Energy Environ. Mater. 2026)
Functional Polymer CompositesFlame-retardant polyimide/PVA composites, superhydrophobic and superamphiphobic surfaces, solar-steam-generation aerogels (Chem. Eng. J. 2025, Sep. Purif. Technol. 2025)
Semiconductor Packaging InterfacesSilane treatments of chip surfaces for robust underfill adhesion (Small Struct. 2026)
Electrochemical ConversionThermodynamic boundaries of nitrogen-compound conversion coupled with water electrolysis (2026)
Bio & Microfluidic SensingNanozyme glucose biosensors and centrifugation-free microfluidic chips for nucleic-acid extraction and photonic PCR
Korea–Japan Joint ResearchPolymer and perovskite photovoltaics with Kyoto University, Hiroshima University, SKKU, Pusan National University and the University of Seoul