Wavelength dependence of nanoscale photodegradation in poly(3-octylthiophene) thin films

López-Elvira, Elena; Escasain, Elisa; Baró, A. M.; Colchero, J.; Palacios-Lidón, E.

doi:10.1016/j.polymdegradstab.2011.04.002

Cited by 15 publications

(12 citation statements)

References 34 publications

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“…According to our results, degradation under blue wavelengths is yet considerable, and slightly differs from red or green filters. Previous studies on polyalkilthiophenes photodegradation [40] pointed to even a more aggressive degradation of the blue wavelengths rather than UV wavelengths. The authors suggested that the predominant degradation mechanism for incident blue wavelengths could be photobleaching, understood as the loss of optical density due to photoinduced processes.…”

Section: Resultsmentioning

confidence: 97%

Wavelength influence on the photodegradation of P3HT:PCBM organic solar cells

Corcoles

Abad

Padilla

et al. 2015

Solar Energy Materials and Solar Cells

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Section: Resultsmentioning

confidence: 97%

Wavelength influence on the photodegradation of P3HT:PCBM organic solar cells

Corcoles

Abad

Padilla

et al. 2015

Solar Energy Materials and Solar Cells

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“…The bands obtained from the deconvoluted Raman spectra (Fig. 18,19 Hernandez et al 18 also associated a band at 1205 cm -1 to the aromatic form. 18,19 The results indicated that there were changes in the aromatic character of thiophene rings to quinone upon electrochemical oxidation, and that the remaining aromatic rings in the polymer chains were slightly disturbed.…”

Section: Resultsmentioning

confidence: 86%

“…13 Hernandez et al 18 and López-Elvira et al 19 obtained spectra for P3MT and P3OT in the pristine form and more intense Raman bands at 1450 and 1443 cm -1 , respectively. In the P3MT spectrum, the intensity of the frequency for bands at 1191 and 1222 cm -1 increased after the polymer oxidation, while in the P3OT, there was a broadening of the band centered at 1210 cm -1 .…”

Section: Resultsmentioning

confidence: 99%

“…López-Elvira et al 19 observed that in P3OT thin films, the polymer degradation was very sensitive to the illumination wavelength, blue light they found to be more damaging than the UV light. As discussed by López-Elvira et al, 19 topographic variations were not observed until irradiation exposures of one to two orders of magnitude larger were adopted. Excitation radiation at 405 nm was used to obtain the PL spectrum, a frequency for which there is an increase due to a photochemical process.…”

Section: Resultsmentioning

confidence: 99%

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Spectroscopic analysis of the structure and stability of two electrochemically synthesized poly(3-alkylthiophene)s

et al. 2013

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In this work, poly (3-methylthiophene) (P3MT) and poly (3-octylthiophene) (P3OT) films were synthesized electrochemically in non-aqueous media through the oxidation of the monomers, (3-methylthiophene and 3-octylthiophene), using a standard three-electrode cell in acetonitrile with 0.100 mol L-1 LiClO4. The polymeric thin films were deposited on platinum plates for optimal quality control of the process. It was observed that the material as-prepared for the anodic electropolymerization undergoes a natural process of de-protonation as a function of time. Moreover, the partial dedoped form, obtained in NH4OH solution, presents a good chemically stabilite form but, when radiated with blue light again becomes unstable. Films obtained by these methods have been characterized by cyclic voltammetry, Raman and photoluminescence spectroscopy. Both Raman and photoluminescence (PL) spectra results led to the characterization of two structures (pristine and non-pristine forms of thiophene rings) which formed the P3MT and P3OT polymer chain. These results were associated with the stabilization of pristine chains and mixed chains (non-pristine structures), radical cation and dication forms, in the polymeric film. Their bands in the Raman and PL spectra are wide and asymmetric and their adjustments by Gaussian functions were necessary, indicating that there are three distinct contributions to the vibration and two to the emission spectra in the formed polymeric material

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“…A significant decrease in the fill factor of glass/ITO/poly (3,4-ethylenedioxythiophene):poly(4-styrene sulfonate) (PEDOT:PSS)/P3HT:PCBM/Yb/Al solar cells (where ITO is the indium tin oxide) was determined after illumination for 500 h by a 150 W Xe lamp, by means of light dependent current-voltage measurements, where irradiation was the trigger for degradation irradiation and the introduction of a thin layer of C 60 at the metal-organic interface helped to suppress the degradation as well as the substitution of the PEDOT:PSS layer by MoO 3 [9]. A combination of Kelvin Probe Microscopy with the determination of local contact potential (CP) revealed light-induced processes in poly(3-octylthiophene) (P3OT) -the irradiation of PET-ITO/P3OT devices with UV (365 nm) and blue (480 nm) light caused significant changes in the CP, confirming the degradation of the sample, mainly from an electrical point of view [10]. The addition of multi-walled carbon nanotubes helped to hinder P3HT degradation in both the solid and liquid state, as detected by solar simulator and spectrometric techniques [11].…”

Section: Introductionmentioning

confidence: 88%

The influence of transport layers on the photodegradation stability of polymer solar cell structures

Možíšková

Heinrichová

Šedina

et al. 2014

Journal of Polymer Engineering

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A light exposure degradation study of electrically active polymers -high-glass-transition-temperature poly(1,4-phenylenevinylene) (T g -PPV); poly(3-hexylthiophene-2,5-diyl) (P3HT); and poly(2-methoxy-5-(3′-7′-dimethyloctyloxy)-1,4-phenylenevinylene) (MDMO-PPV) -in pure form and blends with [6,6]-phenyl C 61 -butyric acid methyl ester (PCBM) was conducted to assess the influence of the employed transport layers on the materials' photodegradation stability. Devices were prepared on quartz glass and silicon (Si) substrates with a transport layer prepared from poly(3,4-ethylenedioxythiophene):poly(4-styrene sulfonate) (PEDOT:PSS) or titanium dioxide (TiO 2 ). Photodegradation processes in ambient air demonstrated that the polymers were thermally stable in the dark; thus, the material deteriorations not only were caused by thermal stress, but also from light-induced processes. Degradation processes of pure polymers may be considered as fast -in the order of hours -but retardable by blending of polymers with PCBM. The deposition of polymer blends on an additional layer of PEDOT:PSS or TiO 2 revealed that the polymer blends studied in this work (except for P3HT) presented higher stability against polymer chain scission when deposited onto the TiO 2 layer. Kinetic analysis undertaken during this work revealed that the photodegradation processes were followed by two degradation steps. Degradation kinetics were evaluated according to a Perrin-like model for absorption assessments and according to simple exponential for emission measurements.

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Wavelength dependence of nanoscale photodegradation in poly(3-octylthiophene) thin films

Cited by 15 publications

References 34 publications

Wavelength influence on the photodegradation of P3HT:PCBM organic solar cells

Wavelength influence on the photodegradation of P3HT:PCBM organic solar cells

Spectroscopic analysis of the structure and stability of two electrochemically synthesized poly(3-alkylthiophene)s

The influence of transport layers on the photodegradation stability of polymer solar cell structures

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