Superior aggregation, morphology and photovoltaic performance enabled by fine tuning of fused electron-deficient units in polymer donors

Pu，Mingrui1; Lai，Xue1; Chen，Hui1,2; Cao，Congcong1; Wei，Zixiang3; Zhu，Yulin1; Tian，Leilei3; He，Feng1,4

2023-02-01

10.1016/j.jechem.2022.10.016

Journal of Energy Chemistry   Impact Factor & Quartile

2095-4956

Copolymerization of an electron-rich donor (D) unit with an electron-deficient acceptor (A) unit to construct efficient D-π-A-π type donors is an effective strategy for organic solar cell applications. The electron-deficient unit fusion, endows extended π-conjugation plane and insures excellent photoelectronic property, has great advantages to build A moiety and gradually receives considerable attention. In this work, we adopt benzo[2,1-b:3,4-b’]dithiophene and benzopyrazine (BP), benzothiadiazole (BT) and benzoselenadiazole (BS) to cleverly construct a series of fused A units with different electron-deficient ability, and further synthesize three polymer donors PBDP-BP, PBDP-BT, and PBDP-BS, respectively. The relationships between structure and performance were systematically investigated. PBDP-BT shows a moderate aggregation behavior in both solution and film, and the highest hole mobility among the three polymers. After blending with Y6, the PBDP-BT:Y6-based film has the strongest absorption, favorable compatibility, superior crystallinity, and uniform phase separation morphology compared with PBDP-BP or PBDP-BS based blend films. Thus, the device based on PBDP-BT:Y6 has the highest and balanced charge mobility, suppressive recombination, reduced energy loss and achieves an outstanding PCE of 15.14%, which is superior to PBDP-BP:Y6 (8.55%) and PBDP-BS:Y6 (6.85%). These results provide learnable guidelines for future fused electron-deficient unit-based donor design for photovoltaic application.

Aggregation behavior Electron-deficient Morphology Organic solar cell Polymer donor

EI ; SCI

English

First ; Corresponding

National Natural Science Foundation of China["21733005","21975115","51903116"] ; Shenzhen Fundamental Research Program["JCYJ202001091408- 01751","JCYJ20190809163011543","JCYJ20190809161413310"] ; Guangdong Provincial Key Laboratory of Catalysis[2020B121201002] ; Guangdong Innovative and Entrepreneur- ial Research Team Program[2016ZT06G587] ; Shenzhen Sci-Tech Fund[KYTDPT 20181011104007]

Chemistry ; Energy & Fuels ; Engineering

Chemistry, Applied ; Chemistry, Physical ; Energy & Fuels ; Engineering, Chemical

WOS:000915360400001

ELSEVIER

20224513093149

Blending ; Crystallinity ; Electrons ; Energy dissipation ; Hole mobility ; Morphology ; Phase separation ; Photovoltaic effects ; Solar power generation

Energy Losses (industrial and residential):525.4 ; Solar Power:615.2 ; Thermodynamics:641.1 ; Solar Cells:702.3 ; Semiconducting Materials:712.1 ; Chemical Operations:802.3 ; Physical Properties of Gases, Liquids and Solids:931.2 ; Crystalline Solids:933.1 ; Materials Science:951

2-s2.0-85141518016

Scopus

1.Shenzhen Grubbs Institute and Department of Chemistry,Southern University of Science and Technology,Shenzhen,Guangdong,518055,China
2.Academy for Advanced Interdisciplinary Studies,Southern University of Science and Technology,Shenzhen,Guangdong,518055,China
3.Department of Materials Science and Engineering,Southern University of Science and Technology,Shenzhen,Guangdong,518055,China
4.Guangdong Provincial Key Laboratory of Catalysis,Southern University of Science and Technology,Shenzhen,Guangdong,518055,China

Pu，Mingrui,Lai，Xue,Chen，Hui,et al. Superior aggregation, morphology and photovoltaic performance enabled by fine tuning of fused electron-deficient units in polymer donors[J]. Journal of Energy Chemistry,2023,77:19-26.

Pu，Mingrui.,Lai，Xue.,Chen，Hui.,Cao，Congcong.,Wei，Zixiang.,...&He，Feng.(2023).Superior aggregation, morphology and photovoltaic performance enabled by fine tuning of fused electron-deficient units in polymer donors.Journal of Energy Chemistry,77,19-26.

Pu，Mingrui,et al."Superior aggregation, morphology and photovoltaic performance enabled by fine tuning of fused electron-deficient units in polymer donors".Journal of Energy Chemistry 77(2023):19-26.