Highly Crystalline Near-Infrared Acceptor Enabling Simultaneous Efficiency and Photostability Boosting in High-Performance Ternary Organic Solar Cells.
Fong, Patrick W K
So, Shu Kong
KAUST DepartmentKAUST Solar Center (KSC)
Material Science and Engineering Program
Physical Science and Engineering (PSE) Division
Online Publication Date2019-11-15
Print Publication Date2019-12-26
Embargo End Date2020-11-16
Permanent link to this recordhttp://hdl.handle.net/10754/660572
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AbstractThe near-infrared (NIR) absorbing fused-ring electron acceptor, COi8DFIC, has demonstrated very good photovoltaic performance when combined with PTB7-Th as a donor in binary organic solar cells (OSCs). In this work, the NIR acceptor was added to state-of-the-art PBDBT-2F:IT4F-based solar cells as a third component, leading to (i) an efficiency increase of the ternary devices compared to the binary solar cells in the presence of the highly crystalline COi8DFIC acceptor and (ii) much-improved photostability under 1-sun illumination. The electron transport properties were investigated and revealed the origin of the enhanced device performance. Compared to the binary cells, the optimized ternary PBDBT-2F:COi8DFIC:IT4F blends exhibit improved electron transport properties in the presence of 10% COi8DFIC, which is attributed to improved COi8DFIC molecular packing. Furthermore, transient absorption spectroscopy revealed a slow recombination of charge carriers in the ternary blend. The improved electron transport properties were preserved in the ternary OSC upon aging, while in the binary devices they seriously deteriorated after simulated 1-sun illumination of 240 h. Our work demonstrates a simple approach to enhance both OSC efficiency and photostability.
CitationYin, H., Zhang, C., Hu, H., Karuthedath, S., Gao, Y., Tang, H., … Li, G. (2019). Highly Crystalline Near-Infrared Acceptor Enabling Simultaneous Efficiency and Photostability Boosting in High-Performance Ternary Organic Solar Cells. ACS Applied Materials & Interfaces. doi:10.1021/acsami.9b12833
SponsorsG.L. thanks the support from the Research Grants Council of Hong Kong (Project Nos. 15218517, C5037-18G), Shenzhen Science and Technology Innovation Commission (Project No. JCYJ20170413154602102), and the funding for Project of Strategic Importance provided by the Hong Kong Polytechnic University (Project Code: 1-ZE29). S.K.S. would like to acknowledge the support from the Research Grant Council of Hong Kong under Grant #NSFC/RGC N-HKBU 202/16 andthe Research Committee of HKBU under Grant #RC-ICRS/ 15−16/4A-SSK. The research reported in this publication was supported by funding from King Abdullah University of Science and Technology (KAUST).
PublisherAmerican Chemical Society (ACS)