Tert-butyl carbazole modified non-fused ring electron acceptor generating high triplet state energy level for efficient organic solar cell

Luo，Dou1; Zhang，Lifu2; Zeng，Jie3; Dai，Tingting4; Li，Lanqing5; Wong，Wai Yeung6; Xu，Baomin3; Zhou，Erjun4; Chen，Yiwang2; Kyaw，Aung Ko Ko1

2024-06-15

10.1016/j.nanoen.2024.109583

Nano Energy   影响因子和分区

2211-2855

Two-dimensional side-chain plays a crucial role in the construction of efficient non-fused ring electron acceptors (NFREAs). Herein, we introduce a novel NFREA, PCT-4Cl, featuring a tert-butyl carbazole side-chain, and investigate its optoelectronic properties. Notably, PCT-4Cl exhibits a small singlet-triplet energy gap (ΔE) of 0.25 eV. Blending PCT-4Cl with host eC9 or C8C8–4Cl acceptor extends the lifetime of singlet excitons and exciton diffusion length in the blend films. Moreover, the high energy level of the triplet state (E) in PCT-4Cl facilitates efficient transfer of triplet excitons to eC9 or C8C8–4Cl. The addition of PCT-4Cl to PM6:eC9 also leads to a longer crystallization time, restraining eC9 aggregation and enhancing crystallinity in the ternary blend films. Consequently, power conversion efficiencies (PCEs) of 18.84 % and 15.17 % are achieved based on the optimized ternary devices of PM6:eC9:PCT-4Cl (1:1:0.2, wt./wt./wt.) and PM6:C8C8–4Cl:PCT-4Cl (1:1:0.2, wt./wt./wt.), respectively, surpassing the performance of PM6:eC9 (17.34 %) and PM6:C8C8–4Cl (14.05 %). Furthermore, leveraging 2PACz as a hole transporting layer elevates the PCEs of the ternary OSCs to 19.25 % and 15.53 %. These findings underscore the significant role of the tert-butyl carbazole side-chain in elevating the E of NFREA for efficient charge transfer, as well as its role in modulating the crystallinity, presenting a promising pathway for achieving high performance in both binary and ternary OSCs.

Charge transfer Crystallinity NFREAs Tert-butyl carbazole Triplet state

SCI ; EI

英语

第一 ; 通讯

2-s2.0-85189748021

Scopus

1.Guangdong University Key Laboratory for Advanced Quantum Dot Displays and Lighting Department of Electronic & Electrical Engineering,Southern University of Science and Technology,Shenzhen,518055,China
2.Institute of Advanced Scientific Research (iASR)/Key Lab of Fluorine and Silicon for Energy Materials and Chemistry of Ministry of Education,Jiangxi Normal University,Nanchang,330022,China
3.Department of Materials Science and Engineering and Key University Laboratory of Highly Efficient Utilization of Solar Energy and Sustainable Development of Guangdong,Southern University of Science and Technology,Shenzhen,518055,China
4.National Center for Nanoscience and Technology,Beijing,100190,China
5.School of Biotechnology and Health Sciences,Wuyi University,Jiangmen,529020,China
6.Department of Applied Biology and Chemical Technology and Research Institute for Smart Energy,The Hong Kong Polytechnic University,Hung Hom,Hong Kong

Luo，Dou,Zhang，Lifu,Zeng，Jie,et al. Tert-butyl carbazole modified non-fused ring electron acceptor generating high triplet state energy level for efficient organic solar cell[J]. Nano Energy,2024,125.

Luo，Dou.,Zhang，Lifu.,Zeng，Jie.,Dai，Tingting.,Li，Lanqing.,...&Kyaw，Aung Ko Ko.(2024).Tert-butyl carbazole modified non-fused ring electron acceptor generating high triplet state energy level for efficient organic solar cell.Nano Energy,125.

Luo，Dou,et al."Tert-butyl carbazole modified non-fused ring electron acceptor generating high triplet state energy level for efficient organic solar cell".Nano Energy 125(2024).