Accelerating ultrafast processes in hydrogen-bonded complexes under pressure

Acceleration of ultrafast processes is vital in hydrogen-bonded coumarin–methanol complexes for improving the photoelectric conversion efficiency of dye-sensitized solar cells (DSSCs). The traditional methods expedite ultrafast processes individually related to electron injection in DSSCs, namely, i...

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Bibliographic Details
Published in:Applied physics letters 2023-02, Vol.122 (6)
Main Authors: Li, Qi, Zhu, Lixia, Wan, Yu, Wan, Yongfeng, Gao, Jianbo, Yin, Hang, Shi, Ying
Format: Article
Language:English
Subjects:
Absorption spectroscopy
Applied physics
Charge transfer
Coumarin
Dye-sensitized solar cells
External pressure
Hydrogen
Hydrogen bonding
Hydrogen bonds
Internal conversion
Liquid phases
Methanol
Phase transitions
Photoelectricity
Photovoltaic cells
Topology
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Summary:Acceleration of ultrafast processes is vital in hydrogen-bonded coumarin–methanol complexes for improving the photoelectric conversion efficiency of dye-sensitized solar cells (DSSCs). The traditional methods expedite ultrafast processes individually related to electron injection in DSSCs, namely, internal conversion (IC) or intermolecular charge transfer (inter-CT), by adjusting molecular topologies. We introduce pressure as an external drive to realize the acceleration of both processes simultaneously without changing the configuration. In the definite hydrogen-bonded complexes, the acceleration of IC and inter-CT processes is visualized by in situ high-pressure femtosecond transient absorption spectroscopy. In liquid-phase methanol, the IC and inter-CT processes are actuated effectively from 150.20 to 59.21 fs and 93.95 to 29.05 ps, respectively. The quickening of both processes is attributed to the enhancement of intermolecular hydrogen bonds under pressure. After the pressure-induced methanol phase transition, the rates of IC and inter-CT processes at 3.67 GPa are increased by 36.42% and 80.55% compared to at 1.00 atm. Our study results open an enlightening avenue for boosting the photoelectric conversion efficiency of DSSCs.
ISSN:0003-6951
1077-3118
DOI:10.1063/5.0130727