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Effect of chlorination and fluorination of benzothiadiazole on the performance of polymer solar cells
Author(s) -
Zhou Yubing,
Qin Yuancheng,
Ni Cailing,
Xie Yu
Publication year - 2020
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.49006
Subject(s) - fluorine , polymer , chlorine , absorption (acoustics) , absorption spectroscopy , materials science , photochemistry , photovoltaic system , chlorine atom , work (physics) , polymer chemistry , chemical engineering , chemistry , organic chemistry , physics , medicinal chemistry , optics , composite material , thermodynamics , biology , engineering , ecology
In order to explore the effects of chlorine and fluorine on photophysical properties and the differences, in this work, we synthesized five new polymers, P1 – P5 , in which benzo[1,2‐b:4,5‐b]dithiophene as the electron donating and benzothiadiazole as electron withdrawing. Analysis of these five polymers showed that the introduction of Cl and F atoms can deeper the highest occupied molecular orbital of these polymers and enhance the absorption of light by the species, thereby improving V oc and J sc . Chlorination has a stronger ability to reduce energy levels and broaden the absorption spectrum compared to fluorination. Among them, P2 showed an efficiency of 4.08% with J sc of 11.28 mA/cm 2 , V oc of 0.79 V, and fill factor (FF) of 0.45. Since chlorination is easier than fluorination in terms of synthesis, it is advantageous for practical applications. Therefore, we think that chlorination should not be ignored when designing high efficiency photovoltaic materials, especially when their fluorinated counterparts have proven to have good properties.