Excited-State Dynamics in Fully Conjugated 2D Covalent Organic Frameworks
Andreas C Jakowetz1,2, Ture F Hinrichsen2, Laura Ascherl1
1Department of Chemistry and Center for NanoScience (CeNS) , University of Munich (LMU) , Butenandtstrasse 5-13 , 81377 Munich , Germany.
Researchers studied excited-state dynamics in conjugated Covalent Organic Frameworks (COFs). They found a unified model for charge generation via singlet-singlet annihilation, crucial for optoelectronic device applications.
Area of Science:
- Materials Science
- Chemistry
- Physics
Background:
- Covalent organic frameworks (COFs) are tunable porous materials with diverse applications.
- Understanding excited-state dynamics is key for COFs in electronic devices like transistors and solar cells.
Purpose of the Study:
- Investigate ultrafast excited-state dynamics in fully conjugated 2D COFs.
- Develop a unified model for charge generation and decay mechanisms.
Main Methods:
- Transient absorption spectroscopy was employed.
- A series of 2D COFs with varying topologies and chromophores were analyzed.
Main Results:
- Excited states exhibited similar behavior across different COF structures.
- A unified model revealed rapid singlet-singlet annihilation generating charges.
- Observed charge lifetimes extended to tens of microseconds.
Conclusions:
- Singlet-singlet annihilation is a primary charge generation pathway in these COFs.
- Long-lived charges are promising for optoelectronic applications.
- Controlling singlet-singlet annihilation can enhance separated charge yields.
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