Research interest
Nano-Optoelectronic or Photonic Materials and Devices
Perovskite Semiconductors for Energy and Display Applications
Semiconductor Quantum Dots for Laser and Quantum Applications
Emerging Solution-Processable Nanomaterials for Quantum and Optoelectronic Devices
QD- and Perovskite-based Next-generation Displays (AR/VR & Holographic displays)
Major reserach achievement
Lew-base adduct method for perovskite solar cell fabrication (JACS, Citation > 2,000) https://pubs.acs.org/doi/full/10.1021/ja
First-time experimental investigation of trapped-charge driven degradation of perovskite solar cells https://www.nature.com/articles/ncomms13422 and development of pulsatile method to revive perovskite solar cells https://doi.org/10.1016/j.joule.2022.04.007(Nat. Comm. & Joule etc, Citation > 500)
First-time realization of electrically driven amplified spontaneous emission from colloidal quantum dots (Nature & Chemical Reviews) https://www.nature.com/articles/s41586-023-05855-6
Lewis-base adduct method, JACS (Cited more than 2000 times)
Trapped-charge driven degradation of perovskite (Nat. Comm.)
Optically pumped lasing and amplified spontaneous emission from colloidal quantum dots (Adv. Mat.)
Electrically driven amplified spontaneous emission from colloidal quantum dots (Nature)
Research details
Development of highly efficient perovskite solar cells (2013 – 2018)
- Synthesis and fabrication of high-quality perovskite thin films
- Crystallization mechanism of perovskite crystals
- Development of charge transporting layers and electrodes
- Carbon allotropes-based flexible perovskite solar cells
Development of long-term stable perovskite solar cells (2014 – present)
- Degradation mechanism of perovskite crystals
- Pulsatile operation for stabilization of perovskite solar cells
- Operational algorithm for high operational stability under light-soaking
Perovskite crystal structure
o Development of colloidal quantum dot (QD) laser diodes (2020 - present)
- High current-density QD-LEDs over 1 kA cm-2
- Multicarrier states and optical gain properties with electrical pumping
- Integration of photonic structure for laser emission
- Optically pumped lasing and ultrafast laser spectroscopy
o Development of single photon (SP) LED and amplifier (2021 - present)
- Correlation and interferometry measurements for SPs from a single QD
- Electrically driven single photon emissions from colloidal QD
- Single photon amplifier based on broadband low-noise optical gain in QDs