NDLI: Sub-picosecond delocalization in the excited state of conjugated homopolymers and donor

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Sub-picosecond delocalization in the excited state of conjugated homopolymers and donor–acceptor copolymers

Content Provider	Semantic Scholar
Author	Banerji, Natalie
Copyright Year	2013
Abstract	In this feature article, we review and examine evidence that the primary photoexcited species in conjugated polymers is considerably delocalized. Localization occurs via a series of complex relaxation mechanisms on the <200 femtosecond time scale. We show that short-lived delocalization in the neutral excited state and charge separated state of bulk heterojunction blends might play an essential role in ensuring efficient formation of free charge carriers for photovoltaic applications. Finally, the additional parameter of intramolecular charge transfer character in the excited state of more recently developed donor–acceptor copolymers is discussed. Both delocalization and partial charge transfer reduce the binding of the electron and hole in photoexcited organic semiconductors and can help to overcome the bottleneck to macroscopic current generation in polymer solar cells.
Starting Page	3052
Ending Page	3066
Page Count	15
File Format	PDF HTM / HTML
DOI	10.1039/C3TC00005B
Volume Number	1
Alternate Webpage(s)	http://photochemistry.epfl.ch/reprints/JMCC012.pdf
Alternate Webpage(s)	https://infoscience.epfl.ch/record/185771/files/Feature_article.pdf
Alternate Webpage(s)	https://doi.org/10.1039/C3TC00005B
Language	English
Access Restriction	Open
Content Type	Text
Resource Type	Article

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