Charge Transfer Complexes of a Conjugated Polymer

Dramatic enhancement of photo-oxidation stability of a conjugated polymer in blends with organic acceptor

“…However, one of the basic drawbacks of conjugated polymers is their poor photooxidation stability under ambient conditions. 15,16 This CTC can strongly quench the singlet excitons at the polymer blocking the singlet-triplet relaxation pathway and, hence, the triplet generation. 6 To reduce photo-oxidation in polymer devices, encapsulation techniques are currently used.…”

“…15,16 The CTC absorption band overlaps with the MEH-PPV PL band so that fast energy transfer from the MEH-PPV to the CTC is possible. 15,16 The CTC absorption band overlaps with the MEH-PPV PL band so that fast energy transfer from the MEH-PPV to the CTC is possible.…”

Enhanced Photostability and Red‐NIR Photosensitivity of Conjugated Polymer Charge‐Transfer Complexes

“…A promising route to these materials could be utilization of Mulliken type donor-acceptor ground-state charge-transfer complexes (CTCs) based on conjugated polymers. We found that an archetypical conjugated polymer, poly[2-methoxy-5-(2 0 -ethyl-hexyloxy)-1,4-phenylene vinylene] (MEH-PPV), can form the CTCs with some lowmolecular-weight organic acceptors, [1] e.g., with 2,4,7-trinitrofluorenone (TNF). CTCs of this type have a number of attractive properties for their usage in solar cells and photodetectors.…”

“…[7] We show that the photobleaching rate of MEH-PPV:TNF blends decreases up to four orders of magnitude as compared with pristine MEH-PPV. Another promising feature of conjugated polymer CTCs is their pronounced absorption in the red and NIR spectral ranges [1,8] that could be used as an approach to organic low-bandgap materials for solar cells and photodetectors. In this work, we study the photosensitiviy of the MEH-PPV:TNF CTC by photocurrent and surface photovoltage (SPV) spectroscopies.…”

Photo- and thermal-oxidative stability of novel material for photovoltaics: MEH-PPV/TNF blends

“…Poly[(2-methoxy-5-(2 0 -ethylhexyloxy)-1,4-phenylenevinylene] (MEH-PPV) has been all-embracingly investigated for a decade and is now a ''classic'' model for tackling generic problems of plastic PVs [3]. It has been reported recently [4] that MEH-PPV is capable of forming intermolecular CTCs with small organic acceptors and, in particular, with 2,4,7-trinitro-fluorene-9-one (TNF). The MEH-PPV/TNF blends have exhibited effective quenching of MEH-PPV photoluminescence and a notable gain in photoconductivity as compared to that of the neat polymer.…”