Journal
JOURNAL OF CENTRAL SOUTH UNIVERSITY
Volume 28, Issue 7, Pages 1919-1931Publisher
JOURNAL OF CENTRAL SOUTH UNIV
DOI: 10.1007/s11771-021-4741-7
Keywords
all-polymer solar cells; polymer acceptor; low-bandgap; benzotriazole; power conversion efficiency
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Funding
- National Natural Science Foundation of China [21875286]
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The synthesis of a new polymer acceptor PY9-T was achieved, which showed high power conversion efficiency when blended with the wide bandgap polymer donor PBDB-T. The polymer acceptor also exhibited good thermal stability.
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 (1.44x10(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 degrees C. These results suggest that Y9-C16 provides a new building block to develop efficient and stable polymer acceptors.
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