Adding a Third Component with Reduced Miscibility and Higher LUMO Level Enables Efficient Ternary Organic Solar Cells
Artikel i vetenskaplig tidskrift, 2020

It is widely known that the miscibility between donor and acceptor is a crucial factor that affects the morphology and thus device performance of nonfullerene organic solar cells (OSCs). In this Letter, we show that incorporating a third component with lower miscibility and higher lowest unoccupied molecular orbital (LUMO) level into the state-of-the-art PM6:Y6 system can significantly enhance the performance of devices. The best results of the ternary devices are achieved by adding a small molecular acceptor named ITCPTC (similar to 5% w/w), which significantly improves the power conversion efficiency (PCE) of the host system from 16.44% to 17.42%. The higher LUMO of the third component increases the open-circuit voltage (V-oc), while the low miscibility enlarges the domains and leads to improved short-circuit current density (J(sc)) and fill factor (FF). The efficacy of this strategy is supported by using other nonfullerene third components including an asymmetric small molecule (N7IT) and a polymer acceptor (PF2-DTC), which play the same role as ITCPTC and boost the PCEs to 16.96% and 17.04%, respectively. Our approach can be potentially applied to a wide range of OSC material systems and should facilitate the development of the OSC field.

Författare

Ruijie Ma

Hong Kong University of Science and Technology

Tao Liu

Hong Kong University of Science and Technology

Zhenghui Luo

Hong Kong University of Science and Technology

Wuhan University

Ke Gao

City University of Hong Kong

University of Washington

Kai Chen

Xi'an Jiaotong University

Guangye Zhang

eFlexPV Ltd

Wei Gao

City University of Hong Kong

Wuhan University

Yiqun Xiao

Chinese University of Hong Kong

Tsz-Ki Lau

Chinese University of Hong Kong

Qunping Fan

Chalmers, Kemi och kemiteknik, Tillämpad kemi

Yuzhong Chen

Hong Kong University of Science and Technology

Lik-Kuen Ma

Hong Kong University of Science and Technology

Huiliang Sun

Hong Kong University of Science and Technology

Guilong Cai

Chinese University of Hong Kong

Tao Yang

Universidade de Aveiro

Xinhui Lu

Chinese University of Hong Kong

Ergang Wang

Chalmers, Kemi och kemiteknik, Tillämpad kemi, Ergang Wang Group

Chuluo Yang

Wuhan University

Alex K-Y Jen

City University of Hong Kong

University of Washington

He Yan

Hong Kong University of Science and Technology

ACS ENERGY LETTERS

2380-8195 (ISSN)

Vol. 5 8 2711-2720

Ämneskategorier

Programvaruteknik

Inbäddad systemteknik

Annan elektroteknik och elektronik

DOI

10.1021/acsenergylett.0c01364

Mer information

Senast uppdaterat

2020-10-07