Infrared signatures of positive and negative charge carriers in conjugated polymers with low band gaps

Neugebauer, Helmut

doi:10.1016/j.jelechem.2003.09.027

Cited by 32 publications

(23 citation statements)

References 27 publications

(38 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The FT-IR spectra shown in Figure 2 for p-doped PEDOT is near identical to that given by Neugebauer [31] and similar to others, [27,32] with only slight variations in the relative intensities of the peaks in the interval from 400 to 1 600 cm…”

Section: Ft-ir Spectrasupporting

confidence: 84%

High Conductivity PEDOT Using Humidity Facilitated Vacuum Vapour Phase Polymerisation

Fabretto

Zuber

Hall

et al. 2008

Macromol. Rapid Commun.

View full text Add to dashboard Cite

The synthesis of high conductivity poly(3,4‐ethylenedioxythiophene) (PEDOT) films using vacuum vapour phase polymerisation is reported. Water vapour is introduced into the chamber and results suggest that it acts as a proton scavenger during polymerisation. Process optimisation leads to PEDOT films that have high conductivity and a blue‐black appearance. Poor quality films have lower conductivity and a characteristic greenish colour. UV‐vis‐NIR spectra show that poor PEDOT films are characterised by higher absorption in the UV‐vis region and an absorption plateau in the NIR region, which suggests an increased level of disrupted conjugation along the polymer backbone or higher oligomer content. Conversely, high quality PEDOT is characterised by an extended NIR absorption tail and lower absorption in the UV‐vis region.magnified image

show abstract

Section: Ft-ir Spectrasupporting

confidence: 84%

High Conductivity PEDOT Using Humidity Facilitated Vacuum Vapour Phase Polymerisation

Fabretto

Zuber

Hall

et al. 2008

Macromol. Rapid Commun.

View full text Add to dashboard Cite

show abstract

“…Fig. 2) [23,24]. The conductivity of the mat was measured with a four-point probe setup and gave an average value of 60 ± 10Scm −1 .…”

Section: Pedot Nanofibersmentioning

confidence: 99%

All-textile flexible supercapacitors using electrospun poly(3,4-ethylenedioxythiophene) nanofibers

Laforgue

2011

Journal of Power Sources

189

118

View full text Add to dashboard Cite

“…In PCPDT-BT, the cyclopenta-dithiophene (CPDT) moiety is D and the BT moiety is A. We used infrared spectroscopy to study microscopic changes induced by doping, as this technique is known to be sensitive to the presence of charged species in conjugated polymers through molecular vibrations [27][28][29] . An advantage of looking at vibrations is that their absorption resonances are less affected by inhomogeneous broadening, an effect which is instead markedly impacting the amount of information possibly extracted from electronic transitions in conjugated polymers 30,31 .…”

mentioning

confidence: 99%

How intermolecular geometrical disorder affects the molecular doping of donor–acceptor copolymers

et al. 2015

View full text Add to dashboard Cite

Molecular doping of conjugated polymers represents an important strategy for improving organic electronic devices. However, the widely reported low efficiency of doping remains a crucial limitation to obtain high performance. Here we investigate how charge transfer between dopant and donor-acceptor copolymers is affected by the spatial arrangement of the dopant molecule with respect to the copolymer repeat unit. We p-dope a donor-acceptor copolymer and probe its charge-sensitive molecular vibrations in films by infrared spectroscopy. We find that, compared with a related homopolymer, a four times higher dopant/ polymer molar ratio is needed to observe signatures of charges. By DFT methods, we simulate the vibrational spectra, moving the dopant along the copolymer backbone and finding that efficient charge transfer occurs only when the dopant is close to the donor moiety. Our results show that the donor-acceptor structure poses an obstacle to efficient doping, with the acceptor moiety being inactive for p-type doping.

show abstract

Infrared signatures of positive and negative charge carriers in conjugated polymers with low band gaps

Cited by 32 publications

References 27 publications

High Conductivity PEDOT Using Humidity Facilitated Vacuum Vapour Phase Polymerisation

High Conductivity PEDOT Using Humidity Facilitated Vacuum Vapour Phase Polymerisation

All-textile flexible supercapacitors using electrospun poly(3,4-ethylenedioxythiophene) nanofibers

How intermolecular geometrical disorder affects the molecular doping of donor–acceptor copolymers

Contact Info

Product

Resources

About