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Research Highlight

KSJ research group aims to develop and characterize novel functional materials. 

We synthesize novel materials and measure optical, electrical, magnetic, and chemical properties using various methods. Performing both synthesis and characterization enables us to clearly understand the underlying photophysical and photochemical phenomena. Also, we fabricate QLED and infrared photodetectors.

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i) Steady-state intraband and interband transitions of Quantum Dots

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ii) IR QD Photodetector (MWIR, eSWIR, SWIR)

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iii) Quantum Plasmon Resonance

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iv) Infrared lasing nanomaterials

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Publication
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Non-toxic Silver Telluride

Colloidal Quantum Dot
Mid-infrared Photodetector

Nat. Commun. 2026, ASAP

We report on mid-wavelength infrared-tunable Ag2Te colloidal quantum dots via a post-growth method and the MWIR Ag2Te QD photodetector that covers the full mid-wavelength infrared spectral range (3–5 μm). We achieved the photoresponse time of 230 ns(rise)  and 576 ns(fall), and the specific detectivity (D*) of 1.2 × 10^9 Jones at 0.02 V under 78 K.

Congratulations, Dr. So Young Eom and Lee Jin Hyeok, on the paper "Non-toxic silver telluride colloidal quantum dot mid-infrared photodetector" published in

Nature Communications. 

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엄소영 박사 &이진혁 학생의 논문이 Nature Communications 에

등재되었습니다. 축하합니다!​

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Contact

우리는 반도체 나노결정, 양자물질 및 적외선 물질 연구자입니다.

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Available position(2026년 2학기)

 : + 대학원생 + 학부연구생 + Post-doc

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We have open positions for passionate graduate students and postdocs with backgrounds in chemistry, physics, chemical engineering, material science, and electrical engineering.

kwangsjeong@korea.ac.kr

copyright © 2020 KSJ lab

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