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Report of Prof. Alex K.-Y.Jen from University of Washington

Time:2014-06-24 21:09

Alex K.-Y. Jen

Ph.D., University of Pennsylvania, 1984.
Boeing-Johnson Chair Professor and Chair of the Materials Science & Engineering Department and the Founding Director of the Institute of Advanced Materials for Energy at the University of Washington, Seattle.
Dr. Jen’s research interest is focused on utilizing molecular, polymeric and biomacromolecular self-assembly to create ordered arrangement of organic and inorganic functional materials for photonics, optoelectronics, nanomedicine, and nanotechnology. He has co-authored more than 550 publications which have been cited for >20,000 times with a H-index of 72. 
For his contributions in the organic photonics and electronics, he was elected as Fellow by several professional societies including the American Association of the Advancement of Science (AAAS), the International Society of Optical Engineering (SPIE), the Optical Society America (OSA), the American Chemical Society’s Polymeric Materials Science & Engineering Division (PMSE), the American Chemical Society (ACS), and the Materials Research Society (MRS). He was inducted as an Academician to the Washington State Academy of Sciences in 2011. And he joined the Recruitment Program of Global Experts (Chair Professor at the Zhejiang University) in 2012.(Alex Jen faculty web page)
 

Topic:  Rational Material Design, Interface and Device Engineering for High-Performance and Stable Polymer Solar Cells

Abstract: .Advances in controlled synthesis, processing, and tuning of the properties of organic conjugated polymers have enabled significantly enhanced performance of organic electronic devices. Our laboratory employs a molecular engineering approach to develop processible low band-gap polymers with high charge carrier mobility for enhancing power conversion efficiency of single junction solar cells to ~10%. We have also developed several innovative strategies to modify the interface of bulk-heterojunction devices and create new device architectures to fully explore their potential for solar window applications.
The performance of polymer solar cells is strongly dependent on their efficiency in harvesting light, exciton dissociation, charge transport, and charge collection at the metal/organic/metal oxide interfaces. In this talk, the integrated approach of combining material design, interface, and device engineering to significantly improve the performance of polymer and hybrid perovskite photovoltaic cells(PCE of>17%) will be discussed. Specific emphasis will be placed on the low band-gap polymers with low reorganization energy and proper energy levels, formation of optimized morphology of bulk-heterojunction layer, and minimized interfacial energy barriers with functional surfactants and graphene oxide. At the end, several new device architectures and processing strategies to make tandem cells and semitransparent solar cells will be discussed to explore the full promise of polymer solar cells and perovskite hybrid solar cells.

Time: June 27th (Friday), at 9:30 a.m.

Location:Room 230 in the Building of DPSE

(By elan)

 



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