Achieving Fast Charge Separation and Low Nonradiative Recombination Loss by Rational Fluorination for High‐Efficiency Polymer Solar Cells
Autor: | Lei Meng, Shanshan Chen, Jie Min, Menglan Lv, Changduk Yang, Chenkai Sun, Rui Sun, Chunfeng Zhang, Ziya Shang, Rui Wang, Min Xiao, Yongfang Li, Fei Pan, Beibei Qiu |
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Rok vydání: | 2019 |
Předmět: |
chemistry.chemical_classification
Materials science Mechanical Engineering Energy conversion efficiency chemistry.chemical_element 02 engineering and technology Polymer 010402 general chemistry 021001 nanoscience & nanotechnology Photochemistry 01 natural sciences Acceptor Polymer solar cell 0104 chemical sciences chemistry.chemical_compound Quinoxaline chemistry Mechanics of Materials Fluorine Thiophene General Materials Science 0210 nano-technology HOMO/LUMO |
Zdroj: | Advanced Materials. 31:1905480 |
ISSN: | 1521-4095 0935-9648 |
DOI: | 10.1002/adma.201905480 |
Popis: | Four low-cost copolymer donors of poly(thiophene-quinoxaline) (PTQ) derivatives are demonstrated with different fluorine substitution forms to investigate the effect of fluorination forms on charge separation and voltage loss (Vloss ) of the polymer solar cells (PSCs) with the PTQ derivatives as donor and a A-DA'D-A-structured molecule Y6 as acceptor. The four PTQ derivatives are PTQ7 without fluorination, PTQ8 with bifluorine substituents on its thiophene D-unit, PTQ9, and PTQ10 with monofluorine and bifluorine substituents on their quinoxaline A-unit respectively. The PTQ8- based PSC demonstrates a low power conversion efficiency (PCE) of 0.90% due to the mismatch in the highest occupied molecular orbital (HOMO) energy levels alignment between the donor and acceptor. In contrast, the devices based on PTQ9 and PTQ10 show enhanced charge-separation behavior and gradually reduced Vloss , due to the gradually reduced nonradiative recombination loss in comparison with the PTQ7-based device. As a result, the PTQ10-based PSC demonstrates an impressive PCE of 16.21% with high open-circuit voltage and large short-circuit current density simultaneously, and its Vloss is reduced to 0.549 V. The results indicate that rational fluorination of the polymer donors is a feasible method to achieve fast charge separation and low Vloss simultaneously in the PSCs. |
Databáze: | OpenAIRE |
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