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Enhanced Photostability and Red‐NIR Photosensitivity of Conjugated Polymer Charge‐Transfer Complexes
Author(s) -
Ozimova Anastasiya E.,
Bruevich Vladimir V.,
Dittrich Thomas,
Paraschuk Dmitry Yu.
Publication year - 2010
Publication title -
macromolecular symposia
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.257
H-Index - 76
eISSN - 1521-3900
pISSN - 1022-1360
DOI - 10.1002/masy.201051021
Subject(s) - materials science , photobleaching , photocurrent , conjugated system , photosensitivity , band gap , optoelectronics , photochemistry , polymer , photodegradation , photoelectric effect , acceptor , optics , chemistry , photocatalysis , fluorescence , organic chemistry , physics , composite material , condensed matter physics , catalysis
A promising route to photostable and low‐bandgap polymer materials for optoelectronic and photonic applications could be utilization of donor‐acceptor ground‐state charge‐transfer complexes (CTCs) of wide‐bandgap conjugated polymers. In this work, we report our results on photostability and photoelectric studies of CTC between an archetypical conjugated polymer MEH‐PPV and low‐molecular‐weight acceptor 2,4,7‐trinitrofluorenone (TNF). By using the pump‐probe laser photobleaching technique, we show that the photodegradation rate of MEH‐PPV:TNF blend films decreases up to four orders of magnitude as compared with pristine MEH‐PPV. By using photocurrent and surface photovoltage spectroscopies, we demonstrate that the photoelectric sensitivity of the MEH‐PPV:TNF CTC can be deeply extended in the polymer optical gap down to 1 µm. However, the main drawback of the CTC studied is their low charge collection efficiency, and an approach to increasing it is discussed.