报告题目:Scalable photoelectrical conversion of solar energy: Organic
photovoltaics报 告 人:Olle Inganäs教授,瑞典林雪平大学,
瑞典皇家科学院院士, 诺贝尔物理奖委员会委员邀 请 人:曹镛教授,
中国科学院院士报告时间:2018年11月22日(周四)下午16:00-17:30报告地点:科技园国重大楼(1号楼)N308A
学术报告厅欢迎广大师生参加!材料科学与工程学院2018年11月16日报告摘要:Scalable
photoelectrical conversion of solar energy: Organic photovoltaicsOlle
Inganäs, ProfessorBiomolecular and organic electronics,IFM, Linköping
University, Linköping, SwedenThe rapid development of organic
photovoltaic (OPV) materials at present is much due to the change from
fullerene acceptors to new families of organic acceptors. Concurrently,
development of processing at larger areas is giving promising results,
in the form of polymer/polymer blends from green solvents breaking the
10 % barrier. The predicted thermodynamic limits for the power
conversion efficiency of organic photovoltaics is reduced by the
presence of non-radiative losses, which remain to be suppressed. Old
rules for materials development must be substituted with new; high
photoluminescence efficiency should be a desired goal for the low
bandgap element in a donor/acceptor blend. Transport is dispersive in
disordered organic materials; there is no single time-independent
mobility, and charge carriers can be collected even if they have a low
steady state mobility.From recent studies of transient spectroscopy in
ternary blends, we note that the primary act of charge generation may
include elements of vibronic coherence; however, at longer times, the
charge separated state is stabilized by disorder and entropy. The
balance of order and disorder is critical for establishing conditions
for efficient charge separation and transport; therefore also the
formation of the nanostructure of donor/acceptor blends is a critical
element for high performance materials in solar modules, to be produced
in printing plants. The upscaling of organic photovoltaic module
production is urgent.While silicon and carbon are abundant elements on
earth, this is not so for elements like Te, Ga, I,… used in thin film
inorganic and hybrid materials. These elements are not fully scalable
for global solar electricity supply. While great developments in the
power conversion efficiency of OPV is now ongoing, even more important
is the steadily improving energy payback time, which is already an order
of magnitude shorter than for silicon photovoltaics. This demonstrates
that the fastest route of substituting fossil energy by solar energy
should use organic photovoltaic materials. These are however not
sufficiently stable at present; an intense effort is needed to select
and improve the stability of new organic photovoltaic materials in high
efficiency modules.报告人简介:Olle
Inganäs教授是瑞典皇家科学院院士,诺贝尔物理奖委员会委员
(2012-2016任委员,2016年任主席)。他的科研专注于有机电子领域,并在该领域取得杰出成就。近年来,他在发表SCI论文550多篇,引用次数超过35000次,H因子达99,在2010年荣获瑞典前十名科学论文引用次数科学家。Olle
Inganäs is professor of biomolecular and organic electronics, IFM,
Linköpings Universitet, Sweden. He received a MSc in engineering physics
from Chalmers University of Technology (1977), a BSc in philosophy and
economics from Göteborg University (1978), and a PhD in applied physics
at Linköping University in 1984. He was appointed professor in 1999.
Inganäs received the Göran Gustafsson prize in physics in 1997, and was
appointed Wallenberg Scholar 2010-2020. He was elected a member of the
Royal Swedish Academy of Sciences, class of physics, in 2006, a member
of the Nobel committee for the prize in physics 2012-2016, and chairman
in 2016.Inganäs has focused on studies of the class of conjugated
polymers throughout areas of polymer physics, electrochemistry,
electronics and optics. He has contributed to a number of startup
companies in the field of electronic polymers. His current interest
include energy conversion and energy storage with organic photovoltaic
devices and organic supercabatteries, as well as the use of biopolymers
as organisers of electronic polymers. With >550 papers, >35,000
citations and an H index of 99, he has contributed to these areas of
science over the last 35 years.附件:无

报告题目:Impact of Side Chain Engineering and Molecular Weight Control
of Polymer Acceptors in All-Polymer Solar Cells

报 告 人:Bumjoon J. Kim

报告时间:2018年1月26日(星期五)上午10:00

报告地点:北区科技园1号楼国重大楼501会议

欢迎广大师生前来参加!

材料科学与工程学院

2018年1月15日

报告摘要:

Polymer-polymer solar cells (so called all-polymer solar cells,
all-PSCs) have emerged as good candidates for applications in flexible
and portable devices because these devices offer much superior thermal
and mechanical endurance than conventional polymer-fullerene solar
cells. However all-PSCs often suffer from low short-circuit current
density, and thus power-conversion efficiency. In this talk, we will
discuss three major challenges that need to be addressed in improving
the photovoltaic performance of all-PSCs, i.e., (1) the low electron
transport ability of polymer acceptor, (2) the precise control of
molecular packing structure and orientation of polymer acceptor, and (3)
polymer donor-acceptor demixing (unfavorable blend morphology). We will
also discuss the advantage and potential of all-PSCs over
polymer-fullerene PSCs systems. Finally, based on comprehensive
understanding gained from the comparative study, we will present our
molecular design strategies of either polymer donor or acceptor, which
allow to overcome each recognized challenges in all-PSCs. For instance,
main backbone/side chain engineering, molecular weight control
systematically modulated molecular packing, orientation and blend
morphology in all-PSCs, thus boosting light-conversion efficiency up to
8%. Our results provide the guidelines for the design of polymer donors
and acceptors for high-performance all-PSCs, which will offer a great
opportunity for successful realization of flexible and portable power
generators.

References

[1] B. J. Kim*, T. S. Kim* et al. Nature Comm. 2015, 6, 8547

[2) B. J. Kim*, H. Y. Woo* et al. J. Am. Chem. Soc. 2015, 137, 2359

[3] B. J. Kim* et al. Advanced Materials 2015, 27, 2466

[4) B. J. Kim*, S.H. Jin* et al. Advanced Materials 2016, 28, 10016

[5]www.602.net, B. J. Kim* et al. Accounts of Chemical Research 2016, 49, 2424

报告人简介:

Bumjoon Kim is Professor in the Department of Chemical and Biomolecular
Engineering at KAIST since 2008. He completed his doctorate in 2006
under the guidance of Prof. Edward Kramer at the University of
California, Santa Barbara. Then, he worked with Prof. Jean Fréchet at
the University of California, Berkeley. His research interests include
development of novel functional hybrid materials based on the control of
nanoparticles location within polymers, and design of new conducting
polymers for organic photovoltaics with high performance and stability.
He has published more than 140 research articles, and holds about 50
patents. He was appointed as Ewon Associate Professor at KAIST
(2010-2013). Also, he received the KAIST Academic Excellence Award
(2015) and he was selected as 2013 Young Scientist by the World Economic
Forum (DAVOS Forum). He currently serves as Editorial Advisory Board of
Macromolecules, ACS Macro Letters, Chemistry of Materials (ACS) and J.
Mater. Chem. A (RSC).

附件:无

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