Se-Woong Baek

Se-Woong Baek.jpgSe-Woong Baek received the Ph. D. at EEWS graduate school of KAIST in 2017. He studied organic and inorganic optoelectronic devices such as solar cells and light emitting diode (LED). Especially, he joined Sargent group (Univ. of Toronto) in 2017 and dived into the colloidal quantum dot (CQD)-based optoelectronics field. He has the expertise in the field of CQD-based optoelectronic (PV, PD)and their hybrid structure with organic components. He published over 40 papers including Nature Energy, 2019, 4, 969 as a main authorship. Currently, he isworking on CQD IR optoelectronics at current affiliation, Korea University as anassistant professor.


Colloidal Quantum Dots-based Infrared Optoelectronics

Se-Woong Baek1

1Department of Chemical & BiologicalEngineering, KoreaUniversity

Colloidal quantum dots (CQDs) are promising semiconducting materials, possessing quantum confinement effects. It results astrong advantage to modulate optical bandgap by controlling the physical structure. Therefore, CQD has drawn a significant attention as anext-generation optoelectronics. Specifically, broad band photo-response of lead-chalcogenideCQD across visible to infrared enables to realize infrared luminescence,photo-response, and energy conversion, which is essential compartment for the emerging industry fields including autonomous driving, virtual reality (VR),internet of things (IoT), and smart systems.

In this seminar, we introduce the recentadvances of CQD as infrared (IR) optoelectronics sources. We describe various engineering ideas that can maximize IR quantum efficiency through photonicstructures and multiple absorber combinations, which is a key property in photodetection and photovoltaic.1-3Finally, we showcase the future perspective of CQD optoelectronics field.


[1] Baek, S. W. et al."Efficient hybrid colloidal quantum dot/organic solar cells mediated bynear-infrared sensitizing small molecules". Nat Energy 2019,4 (11), 969-976.

[2] Baek, S. W. et al. "Infrared Cavity-EnhancedColloidal Quantum Dot Photovoltaics Employing Asymmetric Multilayer Electrodes".Acs Energy Lett 2018,3 (12), 2908-2913.

[3] Baek, S. W. et al. "Nanostructured BackReflectors for Efficient Colloidal Quantum-Dot Infrared Optoelectronics". Adv Mater 2019,31 (33).

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