Research

Materials-to-chip optoelectronics for infrared detection, imaging, and integrated systems

Nano Photonics Research Group

From quantum-dot materials to chip-ready photodetection systems.

We connect colloidal semiconductor synthesis, thin-film processing, device physics, detector arrays, and system validation to build optoelectronic devices that can move from individual pixels toward integrated imaging platforms.

Bilayer LiF/C60 interfacial strategy paper cover CMOS-compatible PbS quantum dot photodetectors paper cover Nature Electronics EQE testing paper cover

Research Directions

Swipe each direction to browse representative papers. Every card opens the DOI.

01

Colloidal Quantum Dot SWIR Detection

Core Question

How can solution-processed PbS quantum dots deliver low dark current, strong carrier extraction, and stable short-wave infrared response?

Our Approach

Ligand exchange, interfacial layers, hybrid-size transport strategies, and process routes that tune band alignment and suppress leakage paths.

Representative Outcome

Recent work advances inverted PbS QD photodetectors, interface-enhanced smoke detection, and SWIR devices with improved transport layers.

Bilayer LiF/C60 Interfacial StrategyIEEE EDL · 2026DOI Size Effects Of EDT-Treated PbS QDsJPCL · 2025DOI PVDF Enhanced QD SWIR PhotodetectorsIEEE EDL · 2025DOI Hybrid-Size QDs Depress Dark CurrentACS Photonics · 2025DOI SWIR Photodetector For Smoke DetectionACS AELM · 2025DOI Suppressing Dark Current In PbS QD SWIR PDsIEEE EDL · 2025DOI
02

Perovskites And Low-Dimensional Optoelectronic Materials

Core Question

How do crystal quality, dimensionality, traps, and phase evolution shape the optoelectronic response of emerging semiconductors?

Our Approach

Controlled growth, defect and trap-density reduction, perovskite-to-QD conversion, and material routes that bridge visible and infrared operation.

Representative Outcome

Perovskite single-crystal thin films and converted PbS QDs support cleaner transport pathways for next-generation photodetectors.

Perovskite Single-Crystal Thin FilmsCell Reports Physical Science · 2023DOI Perovskite Nanocrystals To PbS QDsAdvanced Optical Materials · 2024DOI CsPbBr3 Phase TransitionSID Symposium Digest · 2024DOI Low-Dimensional Optoelectronic MaterialsAdvanced Optical Materials · 2025DOI Low-Noise SWIR Device InterfacesACS Photonics · 2025DOI
03

Photodetector Arrays And Imaging

Core Question

How can single-pixel device performance be translated into array-level uniformity, image quality, and application-ready sensing?

Our Approach

Patterned thin films, array-oriented process control, device-to-system testing, and application demonstrations such as infrared imaging and smoke detection.

Representative Outcome

The group builds a path from high-performance photodetectors toward imaging arrays while drawing on microdisplay and pixel-integration experience.

Instant Smoke Detection ApplicationsACS AELM · 2025DOI QD LED-On-Silicon MicrodisplayJSID · 2023DOI Spray-Deposited PbS QD SolidsNano Energy · 2020DOI Electrophoretic Deposition For SWIR PDsOGC · 2024DOI Enhanced Responsivity PbS QD PDsACS ANM · 2019DOI
04

CMOS And Chip-Compatible Integration

Core Question

What material and interface choices make colloidal optoelectronic devices compatible with practical chip and readout processes?

Our Approach

Self-assembled monolayers, chip-aware process windows, low-temperature thin films, and interface stacks that support scalable integration.

Representative Outcome

CMOS-compatible PbS QD photodetectors connect material chemistry to integrated-device constraints.

CMOS-Compatible PbS QD PhotodetectorsNano Research · 2025DOI Full-HD QD LED-On-Silicon MicrodisplayJSID · 2023DOI Electrophoretic Deposition For SWIROGC · 2024DOI Display And Pixel IntegrationSID Symposium Digest · 2024DOI Device Integration WorkflowEEICE · 2025DOI
05

Device Physics, Characterization And System Validation

Core Question

Which measurements actually explain device limits, and how should emerging photodetectors be compared across materials and labs?

Our Approach

Standardized EQE thinking, transient and spectral measurements, in-situ structural probes, interface analysis, and application-level validation.

Representative Outcome

Recent work argues for better testing standards while earlier studies use GISAXS, spectroscopy, and transport analysis to connect structure to performance.

Standardizing EQE TestingNature Electronics · 2025DOI Two-Step Ligand ExchangeACS AMI · 2019DOI QD-Gold Interface FormationACS AMI · 2020DOI GISAXS And Spray-Deposited QD SolidsNano Energy · 2020DOI QD Size Effects In Transport LayersJPCL · 2025DOI