TY - JOUR
T1 - Highly Crystalline Near-Infrared Acceptor Enabling Simultaneous Efficiency and Photostability Boosting in High-Performance Ternary Organic Solar Cells.
AU - Yin, Hang
AU - Zhang, Chujun
AU - Hu, Hanlin
AU - Karuthedath, Safakath
AU - Gao, Yajun
AU - Tang, Hua
AU - Yan, Cenqi
AU - Cui, Li
AU - Fong, Patrick W K
AU - Zhang, Zhuoqiong
AU - Gao, Yaxin
AU - Yang, Junliang
AU - Xiao, Zuo
AU - Ding, Liming
AU - Laquai, Frédéric
AU - So, Shu Kong
AU - Li, Gang
N1 - KAUST Repository Item: Exported on 2020-10-01
Acknowledgements: G.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).
PY - 2019/11/15
Y1 - 2019/11/15
N2 - The 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.
AB - The 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.
UR - http://hdl.handle.net/10754/660572
UR - https://pubs.acs.org/doi/10.1021/acsami.9b12833
UR - http://www.scopus.com/inward/record.url?scp=85076855732&partnerID=8YFLogxK
U2 - 10.1021/acsami.9b12833
DO - 10.1021/acsami.9b12833
M3 - Article
C2 - 31729217
SN - 1944-8244
VL - 11
SP - 48095
EP - 48102
JO - ACS Applied Materials & Interfaces
JF - ACS Applied Materials & Interfaces
IS - 51
ER -
