A new low-bandgap polymer acceptor based on benzotriazole for efficient all-polymer solar cells
The rational design of polymer acceptors with strong and broad absorption is critical to improve photovoltaic performance. In this work, a new polymer acceptor PY9-T based on heptacyclic benzotriazole (Y9-C16) as a building block and thiophene unit as the linking unit was synthesized, which exhibite...
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Published in | Journal of Central South University Vol. 28; no. 7; pp. 1919 - 1931 |
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Main Authors | , , , , , , |
Format | Journal Article |
Language | English |
Published |
Changsha
Central South University
01.07.2021
Springer Nature B.V |
Subjects | |
Online Access | Get full text |
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Summary: | The rational design of polymer acceptors with strong and broad absorption is critical to improve photovoltaic performance. In this work, a new polymer acceptor PY9-T based on heptacyclic benzotriazole (Y9-C16) as a building block and thiophene unit as the linking unit was synthesized, which exhibited a low bandgap (1.37 eV) and a high extinction coefficient of the neat film (1.44×10
5
cm
−1
). When PY9-T was blended with the wide bandgap polymer donor PBDB-T, the all-polymer solar cells (APSCs) showed a high power conversion efficiency (PCE) of 10.45% with both high open circuit voltage of 0.881 V and short-circuit current density of 19.82 mA/cm
2
. In addition, APSCs based on PY9-T show good thermal stability, as evidenced by slight changes morphologies when annealed at 100 °C. These results suggest that Y9-C16 provides a new building block to develop efficient and stable polymer acceptors. |
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ISSN: | 2095-2899 2227-5223 |
DOI: | 10.1007/s11771-021-4741-7 |