Events

Coming Colloquium

 

HONG KONG BAPTIST UNIVERSITY
Department of Physics&
Institute of Advanced Materials

 

JOINT COLLOQUIUM

 

Efficient Non-fullerene Organic Solar Cells

 

Speaker:
Professor Zhan Xiaowei
Department of Materials Science and Engineering, College of Engineering
Peking University, Beijing, China

 

Date: Thursday, June 8, 2017
Time: 2:30pm – 3:30pm (Tea will be served)
Venue: FSC702, Fong Shu Cheung Library, HSH Campus


Abstract
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Solution processed bulk heterojunction (BHJ) organic solar cells (OSCs) have attracted considerable attention because of some advantages such as light weight, low cost, flexibility and large area fabrication. Nowadays, OSCs based on blends of polymer donors and fullerene acceptors have shown the best performance with power conversion efficiency (PCE) exceeding 10%. Compared tothe rapid development of new electron donor materials, the developmentof novel electron acceptors has lagged behind. There remain incentives to develop non-fullerene electron acceptors that will not only retain the favorable properties of fullerenes, but also overcometheir insufficiencies, such as weak and narrow absorption in the visible region, and limited energy level variability. We firstly proposed the concept of “fused-ring electron acceptor (FREA)”, and designed and synthesized a series of FREAs. OSCsbased on these FREAsexhibited PCE of 12-13%. Moreover, the FREA-based OSCsexhibit better device stability than the fullerene-based counterparts. Now FREAs designed by Zhan group are commercial available. Many well-known research groups across the world have already utilized these FREAs to fabricate high-efficiency OSCs, which surpass the high-performance OSCs based on fullerene acceptors.



HONG KONG BAPTIST UNIVERSITY
Department of Physics&
Institute of Advanced Materials

 

JOINT COLLOQUIUM

 

Unraveling the Fundamental Mechanism in Ternary Organic Bulk Heterojunctions

 

Speaker:
Professor Xiao-Tao HAO
School of Physics, State Key Laboratory of Crystal Materials,
Shandong University, Jinan, Shandong 250100, China

 

Date: Friday, June 9, 2017
Time: 11:00am – 12:00pm (Tea will be served)
Venue: SCT909, Science Tower, HSH Campus


Abstract
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Ternary bulk heterojunction is an effective strategy to achieve high efficient organic photovoltaic devices. Understanding the relationship of the complex morphology and the fundamental physical processes in the ternary system plays a key role to realize efficient electron transfer and enhance the device efficiency.

Here, we investigated the ternary organic photovoltaic systems including two donors and one accepter as model materials. Various physical methods were adopted to adjust the morphology of the ternary blend films at nanoscale. Advanced synchrotron based techniques were employed to quantitatively analyze the morphology at multiple length scale. The photophysical dynamics including charge separation/transport, excited state characteristics were investigated on ultrafast temporal scale via the time resolved spectroscopy. We have attempted to unravel the fundamental mechanism of synergistic effect in ternary bulk-heterojunction blends for photovoltaic applications.



All Interested Are Welcome!
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For enquiry: 3411-5145

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