Chlorination and Position Isomerization to Enhance the Photovoltaic Performance of Polymer Donors

Pu，Mingrui1; Zhu，Yiwu1; Tan，Pu1; Zhu，Yulin1; Lai，Xue1; Chen，Hui1; Qu，Jianfei1; He，Feng1,2

2023-08-08

10.1021/acs.macromol.3c01416

Macromolecules   Impact Factor & Quartile

0024-9297

1520-5835

Substitution of chlorine in a conjugated side chain is a simple and effective method with which to improve the photoelectronic properties of polymer donors. The chlorination and chlorine-substituted position affects the photovoltaic performance of organic solar cells. Herein, the polymers PBDQx-β-H, PBDQx-β-Cl, and PBDQx-α-Cl based on a quinoxaline (Qx) unit were synthesized. The effects of the chlorination and its position isomerization of thiophene side chain on material performance were systematically investigated. After the introduction of a Cl atom at the β-position, the PBDQx-β-Cl achieves dramatically enhanced absorption and aggregation abilities compared with PBDQx-β-H. When the Cl atom is in the α position, a better backbone planarity of PBDQx-α-Cl is assumed and the polymer PBDQx-α-Cl exhibits the much stronger absorption and further improved molecular aggregation in comparison with PBDQx-β-Cl. Meanwhile, when blended with an acceptor, Y6, the PBDQx-α-Cl-based blend film shows a more suitable nanoscale phase separation morphology. Consequently, PBDQx-α-Cl:Y6-based devices achieve an excellent power conversion efficiency of 15.24% with a synchronously promoted open-circuit voltage (V), short-circuit current density (J), and fill factor (FF). These are much higher than those achieved by the PBDQx-β-H-based devices (7.73%). These results show that the dual strategy of chlorination and position isomerization is a promising approach with which to gradually design and synthesize highly efficient polymer donors.

SCI

English

NI Journal Papers ; NI论文

First ; Corresponding

National Natural Science Foundation of China["21975115","22225504"] ; Shenzhen Fundamental Research Program["JCYJ20200109140801751","JCYJ20210324120010028"] ; Guangdong Provincial Key Laboratory of Catalysis[2020B121201002]

Polymer Science

Polymer Science

WOS:001039606400001

AMER CHEMICAL SOC

CHEMISTRY

2-s2.0-85167832588

Scopus

1.Shenzhen Grubbs Institute and Department of Chemistry,Southern University of Science and Technology,Shenzhen,518055,China
2.Guangdong Provincial Key Laboratory of Catalysis,Southern University of Science and Technology,Shenzhen,518055,China

Pu，Mingrui,Zhu，Yiwu,Tan，Pu,et al. Chlorination and Position Isomerization to Enhance the Photovoltaic Performance of Polymer Donors[J]. Macromolecules,2023,56(15):5865-5872.

Pu，Mingrui.,Zhu，Yiwu.,Tan，Pu.,Zhu，Yulin.,Lai，Xue.,...&He，Feng.(2023).Chlorination and Position Isomerization to Enhance the Photovoltaic Performance of Polymer Donors.Macromolecules,56(15),5865-5872.

Pu，Mingrui,et al."Chlorination and Position Isomerization to Enhance the Photovoltaic Performance of Polymer Donors".Macromolecules 56.15(2023):5865-5872.