Non-Fused Ring Acceptors Achieving over 15.6% Efficiency Organic Solar Cell by Long Exciton Diffusion Length of Alloy-Like Phase and Vertical Phase Separation Induced by Hole Transport Layer

Luo, Dou1; Jiang, Zhengyan2,3; Tan, Wen Liang4; Zhang, Lifu5; Li, Lanqing6; Shan, Chengwei1; McNeill, Christopher R.4; Sonar, Prashant7; Xu, Baomin2,3; Kyaw, Aung Ko Ko1

2022-12-01

10.1002/aenm.202203402

Advanced Energy Materials   Impact Factor & Quartile

1614-6832

1614-6840

The construction of high-performance organic solar cells (OSCs) based on non-fused ring electron acceptors (NFREAs) is challenging despite their low synthesis complexity and low cost. Herein, highly efficient NFREA-based OSCs using a ternary approach by blending two in-house designed NFREAs called "C6C4-4Cl" and "BTIC-4F" with the donor PM6 are demonstrated. The two NFREAs with similar molecular skeletons tend to form an alloy-like phase that exhibits long exciton diffusion lengths and improved crystalline properties for efficient charge transfer. The complementary absorption spectra of the ternary system and energy transfer between the two NFREAs increases the current while the high lowest unoccupied molecular orbital (LUMO) energy level of BTIC-4F enhances the voltage of the OSCs. As a result, the ternary OSC with two NFREAs yields an impressive power conversion efficiency (PCE) of 15.62% using 2PACz as a hole transporting layer (HTL). Investigation of the buried interface reveals that 2PACz has a strong interaction with PM6 and induces vertical phase separation in the ternary blend. This work provides an effective strategy to improve the performance of NFREA-based OSCs by increasing the exciton diffusion length in an alloy-like acceptor phase and inducing vertical phase separation with the judicious selection of HTL.

alloy-like acceptors exciton diffusion length hole transport layers NFREAs vertical phase separation

SCI

English

First ; Corresponding

Shenzhen Science, Technology and Innovation Commission[JCYJ20220530113014033] ; Department of Education of Guangdong Province University Innovation Foundation[2021KTSCX107] ; National Natural Science Foundation of China[62150610496] ; Basic and Applied Basic Research Foundation of Guangdong Province[2019B1515120083] ; Australian Research Council (ARC)[DP210103006]

Chemistry ; Energy & Fuels ; Materials Science ; Physics

Chemistry, Physical ; Energy & Fuels ; Materials Science, Multidisciplinary ; Physics, Applied ; Physics, Condensed Matter

WOS:000899713000001

WILEY-V C H VERLAG GMBH

Web of Science

1.Southern Univ Sci & Technol, Dept Elect & Elect Engn, Guangdong Univ Key Lab Adv Quantum Dot Displays &, Shenzhen 518055, Peoples R China
2.Southern Univ Sci & Technol, Dept Mat Sci & Engn, Shenzhen 518055, Peoples R China
3.Southern Univ Sci & Technol, Key Univ Lab Highly Efficient Utilizat Solar Energ, Shenzhen 518055, Peoples R China
4.Monash Univ, Dept Mat Sci & Engn, Clayton, Vic 3800, Australia
5.Jiangxi Normal Univ, Minist Educ, Natl Engn Res Ctr Carbohydrate Synth, Key Lab Fluorine & Silicon Energy Mat & Chem, Nanchang 330022, Peoples R China
6.Wuyi Univ, Sch Biotechnol & Hlth Sci, Jiangmen 529020, Peoples R China
7.Queensland Univ Technol QUT, Ctr Mat Sci, Sch Chem & Phys, Brisbane, Qld 4000, Australia

Luo, Dou,Jiang, Zhengyan,Tan, Wen Liang,et al. Non-Fused Ring Acceptors Achieving over 15.6% Efficiency Organic Solar Cell by Long Exciton Diffusion Length of Alloy-Like Phase and Vertical Phase Separation Induced by Hole Transport Layer[J]. Advanced Energy Materials,2022.

Luo, Dou.,Jiang, Zhengyan.,Tan, Wen Liang.,Zhang, Lifu.,Li, Lanqing.,...&Kyaw, Aung Ko Ko.(2022).Non-Fused Ring Acceptors Achieving over 15.6% Efficiency Organic Solar Cell by Long Exciton Diffusion Length of Alloy-Like Phase and Vertical Phase Separation Induced by Hole Transport Layer.Advanced Energy Materials.

Luo, Dou,et al."Non-Fused Ring Acceptors Achieving over 15.6% Efficiency Organic Solar Cell by Long Exciton Diffusion Length of Alloy-Like Phase and Vertical Phase Separation Induced by Hole Transport Layer".Advanced Energy Materials (2022).