신소재공학과 BK21+/소프트일렉트로닉스 연구단 고분자연구소 세미나

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신소재공학과 BK21+/소프트일렉트로닉스 연구단 고분자연구소에서 세미나를 아래와 같이 개최하오니 대학구성원 여러분들의 많은 참여 부탁드립니다.

 

■ 초청연사: Prof. Stephen R. Forrest (Departments of Physics and Electrical Engineering and Computer Science, University of Michigan)

■ 일시: 2014년 1월 8일 (수) 11:00~

■ 장소: 연구3동 (RIST 3동) 3326호

■ 세미나주제: From Nanostructure to High Efficiency in Organic Photovoltaics

■ Host of a Seminar: 이태우, 조길원 교수

 

Subject: MSE BK21+/Center for Advanced Soft Electronics Special Seminar. Prof. Stephen R. Forrest

■ Date: 2014. 1. 8 (WED), 11:00 ~

■ Place: RIST Building 3, Room #3326.

■ Title: From Nanostructure to High Efficiency in Organic Photovoltaics

■ Speaker: Prof. Stephen R. Forrest (Departments of Physics and Electrical Engineering and Computer Science, University of Michigan)

■ Host of a Seminar: Prof. Tae-Woo Lee and Kilwon Cho

 

■ Abstract:

It has recently been shown that the fundamental physical origins of the photogeneration process can be simply understood in the context of the kinetics of polaron-pair dissociation and recombination at donor-acceptor heterojunctions1, 2.  This analysis has given rise to the derivation of an ideal diode equation that simply describes the dark current and photoresponse characteristics of organic photovoltaics. In the context of this framework, we discuss methods of controlling the nanostructure of organic thin films that follow the design principles inferred from the ideal diode theory.  Nanostructure control demands that the properties of the donor-acceptor interface and that of the bulk thin films be independently optimized, whereby there needs to be disorder at the interface to reduce the polaron-pair dissociation rate and order in the film bulk to reduce series resistance3.  We show that this morphological control using both solution and vapor phase deposition technologies can create nanostructures with solar conversion efficiencies of over 8% based on squaraine donors and electron conducting buffer layers. Indeed, using a combination vapor deposited blends with nanocrystalline morphology, tandem cells have achieved efficiencies of 10% in our lab. Recently we have extended our analysis to understand polaron and exciton dynamics at organic/inorganic semiconductor junctions.  We will discuss these and other aspects of the photon-to-electron conversion process that lead from nanostructural control to high efficiency organic and hybrid solar cells.

 

1. N. C. Giebink, B. E. Lassiter, G. P. Wiederrecht, M. R. Wasielewski and S. R. Forrest, Phys. Rev. B 82,155306(2010).

2. N. C. Giebink, G. P. Wiederrecht, M. R. Wasielewski and S. R. Forrest, Phys. Rev. B 82,155305(2010).

3. J. D. Zimmerman, X. Xiao, C. K. Renshaw, S. Wang, V. V. Diev, M. E. Thompson and S. R. Forrest, Nano Lett. 12,4366(2012).

 

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