9/17 (목) 전문가초청특강은 아주대학교 김형도 교수님을 모시고 진행합니다.

관심있는 분들의 많은 참석 부탁드립니다.

ㅁ주제: Towards Optoelectronic Devices: from Fundamental Research to Application

ㅁ일시: 09/17 (목) 16:00

ㅁ장소: 제2종합연구동 83188호

ㅁ약력: 

ㅁ초록: 

Charge generation, transport, and recombination in optoelectronic materials are governed by the interplay between excited-state dynamics and nanoscale morphology. In this presentation, I first discuss the relationship between triplet exciton formation and morphology in conjugated polymer systems using transient absorption spectroscopy, demonstrating that phase-separated structures strongly influence triplet exciton yield and photo-oxidation pathways. Next, I address charge transport in crystalline conjugated polymer blends incorporating insulating matrices with different polarity, such as polystyrene (PS) and ZEONEX. Although the crystallinity decreases in the order of J61 neat > J61/ZEONEX > J61/PS, the charge transport behavior does not follow this trend. Instead, distinct phase-separated morphologies govern carrier transport pathways, indicating that morphology rather than crystallinity is the dominant factor. Finally, I focus on the open-circuit voltage (VOC) in perovskite solar cells. Using temperature- and light-intensity-dependent measurements, I systematically analyze recombination mechanisms and quantify the contributions of trap-assisted and bimolecular recombination to VOC losses. This establishes a direct link between recombination mechanisms and device performance. Overall, this work provides a unified understanding of how morphology governs excited-state dynamics, charge transport, and voltage losses, offering key design principles for next-generation optoelectronic devices.