Volume 6, Issue 7 2200147
Research Article

Green-Solvent-Processed 17% Efficient Polymer Solar Cell Achieved Synergistically by Aligning Energy Levels and Improving Morphology with the Quaternary Strategy

Honglin Tan

Honglin Tan

Inner Mongolia University Key Laboratory of Advanced Materials Chemistry and Devices (AMC&DLab) and Inner Mongolia Key Laboratory of Environmental Chemistry, College of Chemistry and Environmental Science, Inner Mongolia Normal University, Huhhot, 010022 China

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Weichao Zhang

Weichao Zhang

Inner Mongolia University Key Laboratory of Advanced Materials Chemistry and Devices (AMC&DLab) and Inner Mongolia Key Laboratory of Environmental Chemistry, College of Chemistry and Environmental Science, Inner Mongolia Normal University, Huhhot, 010022 China

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Pengyu Zhang

Pengyu Zhang

Inner Mongolia University Key Laboratory of Advanced Materials Chemistry and Devices (AMC&DLab) and Inner Mongolia Key Laboratory of Environmental Chemistry, College of Chemistry and Environmental Science, Inner Mongolia Normal University, Huhhot, 010022 China

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Xiaoyu Lv

Xiaoyu Lv

Inner Mongolia Key Laboratory of Functional Materials Physics and Chemistry, College of Physics and Electronic Information, Inner Mongolia Normal University, Hohhot, 010022 China

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Alata Hexig

Alata Hexig

Inner Mongolia Key Laboratory of Functional Materials Physics and Chemistry, College of Physics and Electronic Information, Inner Mongolia Normal University, Hohhot, 010022 China

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Jianhua Huang

Jianhua Huang

College of Materials Science and Engineering, Huaqiao University, Xiamen, 361021 China

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Beigang Li

Corresponding Author

Beigang Li

Inner Mongolia University Key Laboratory of Advanced Materials Chemistry and Devices (AMC&DLab) and Inner Mongolia Key Laboratory of Environmental Chemistry, College of Chemistry and Environmental Science, Inner Mongolia Normal University, Huhhot, 010022 China

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Chuanlang Zhan

Corresponding Author

Chuanlang Zhan

Inner Mongolia University Key Laboratory of Advanced Materials Chemistry and Devices (AMC&DLab) and Inner Mongolia Key Laboratory of Environmental Chemistry, College of Chemistry and Environmental Science, Inner Mongolia Normal University, Huhhot, 010022 China

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First published: 26 March 2022
Citations: 4

Abstract

Low and unbalanced charge mobilities result in low short-circuit current density (JSC) and small fill factor (FF), which greatly limits the power conversion efficiencies (PCEs) of polymer solar cells (PSCs) processed with green solvents. Herein, a unique quaternary material system (PM6:BTP-BO-4F:BTP:PhI-Se) is reported, which uses an upshifted highest occupied molecular orbital (HOMO) acceptor guest (BTP) and a deep-HOMO, ultra-wide bandgap polymer donor guest (PhI-Se) as quaternary strategy to align energy levels and improve morphology, leading to open-circuit voltage (VOC) (from 0.812 to 0.851 V), FF (from 66.1% to 76.7%), and JSC (from 24.4 to 26.1 mA cm−2) increased simultaneously, hence obtaining PCEs of 17.0% processed with toluene. When processed with chlorobenzene (CB), 18.2% efficiency is obtained. Adding BTP and PhI-Se as the third component increases hole and electron mobilities, respectively, going from 1.32/0.63 × 10−4 cm2 V−1 s−1 for the host binary to 1.56/2.56 and 2.26/2.86 × 10−4 cm2 V−1 s−1 for the BTP and PhI-Se ternary. With both adding, the values shift to 3.69/3.20 × 10−4 cm2 V−1 s−1 for the quaternary blends. The crystalline coherence length (CCL) increases from 18.8 nm to 20.2 nm and 23.6 nm, respectively, for the two ternaries, and then 25.7 nm for the quaternary blend.

Conflict of Interest

The authors declare no conflict of interest.

Data Availability Statement

The data that support the findings of this study are available from the corresponding author upon reasonable request.

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