♧Title: Colloidal Quantum Dots for Infrared Light-Harvesting and Detection

♧ Speaker : Prof. Min-Jae Choi (Dongguk University)

♧ Date : 2022. 2. 10 (THU), 4:00 PM 

♧URL: https://zoom.us/j/92009513158?pwd=RGROdGVUeVl5SDlMN0wvbDBnMkNoUT09 

Colloidal Quantum Dots for Infrared Light-Harvesting and Detection

 

Colloidal quantum dots (CQDs) are compelling semiconductor materials for optoelectronic applications owing to their tunable bandgap, solution-processibility, and ambient stability. Of chief importance is the ability to tune their absorption and emission into the infrared, a region of interest in optical communications, night vision, biological imaging, and  infrared photovoltaics.^1,2
III-V compound semiconductors have been used for infrared optoelectronic devices in the range beyond silicon’s bandgap (1.12 eV). However, highly reactive precursors, high-reaction temperatures, and high-quality vacuum systems for the fabrication of III-V semiconductors limit their applications.3 In this talk, I will highlight potential of CQDs as promising infrared materials that can replace conventional III-V semiconductors. In particular, the topic will include recent efforts in light-harvesting and detection beyond 1100 nm using CQDs, and issues for further work will be discussed.

References

1. Chuang, C. H. M., Brown, P. R., Bulovic, V. & Bawendi, M. G. Improved performance and stability in quantum dot solar cells through band alignment engineering. Nat. Mater. 13, 796 (2014).


2. Liu, M. X. et al. Hybrid organic-inorganic inks flatten the energy landscape in colloidal quantum dot solids. Nat. Mater. 16, 258 (2017).


3. Stringfellow, G. B. VPE Growth of III/V Semiconductors. Annu. Rev. Mater. Sci. 8 (1), 73 -98 (1978).

 

Host : Prof. Sungjee Kim (T.279-2108)