Photoluminescence quenching of poly(octylfluorenylbenzothiadiazole) luminophore by n-type cobalt(II) salicylaldimine metallodendrimer

John, Suru Vivian; Mayedwa, Noluthando; Ikpo, Chinwe O.; Molefe, Lerato; Ndipingwi, Miranda M.; Dywili, Nomxolisi; Wyk, Juanita L. van; Mapolie, Selwyn F.; Baker, Priscilla; Iwuoha, Emmanuel I.

doi:10.1016/j.synthmet.2016.05.031

Cited by 6 publications

(4 citation statements)

References 46 publications

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“…Deviation from the vertical line is attributed to the inner diffusion resistance for electrolyte ions that reduces phase angle degree, and which is usually strongly dependent on the applied formal potential [ 65 ]. Microscopic roughness of the electrode surface, and slow adsorption of ions and surface inhomogeneity also make it practically impossible for the barrier film (double-layer) to exhibit the theoretically expected phase angle value of 90° [ 66 ]. G1PPT-co-P3HT displayed increasing phase angle degrees with increasing applied potential in his Bode plot, which is in agreement with results obtained from the Nyquist plot.…”

Section: Resultsmentioning

confidence: 99%

Microscopic, Spectroscopic, and Electrochemical Characterization of Novel Semicrystalline Poly(3-hexylthiophene)-Based Dendritic Star Copolymer

et al. 2022

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In this study, electron-donating semicrystalline generation 1 poly(propylene thiophenoimine)-co-poly(3-hexylthiophene) star copolymer, G1PPT-co-P3HT was chemically prepared for the first time. Copolymerization was achieved with high molecular weight via facile green oxidative reaction. 1H NMR analyses of the star copolymer demonstrated the presence of 84% regioregular (rr) head-to-tail (HT) P3HT, which accounts for the molecular ordering in some grain regions in the macromolecule’s morphology, as revealed by the high-resolution scanning electron microscopy (HRSEM) and Selected Area Electron Diffraction (SAED) images, and X-ray diffraction spectroscopy (XRD) measurements. The star copolymer also exhibited good absorption properties in the ultraviolet-visible (UV-Vis) and the near infrared (NIR) spectral regions, which give rise to an optical energy bandgap value as low as 1.43 eV. A HOMO energy level at −5.53 eV, which is below the air-oxidation threshold, was obtained by cyclic voltammetry (CV). Electrochemical impedance spectroscopy (EIS) ascertained the semiconducting properties of the macromolecule, which is characterized by a charge transfer resistance, Rct, value of 3.57 kΩ and a Bode plot-phase angle value of 75°. The combination of the EIS properties of G1PPT-co-P3HT and its highly electron-donating capability in bulk heterojunction (BHJ) active layer containing a perylene derivative, as demonstrated by photoluminescence quenching coupled to the observed Förster Resonance charge transfer, suggests its suitability as an electron-donor material for optoelectronic and photovoltaic devices.

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Section: Resultsmentioning

confidence: 99%

Microscopic, Spectroscopic, and Electrochemical Characterization of Novel Semicrystalline Poly(3-hexylthiophene)-Based Dendritic Star Copolymer

et al. 2022

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“…From Equation (1), for an outstanding degree of electron/hole pair separation and charge transfer without any recombination taking place, I donor:acceptor must be equal to zero resulting to q equal to 100%. John et al [35] achieved q of 97.29% and 96.6% indicating excellent electron/hole separation and charge transfer for their blends. The quenching parameter q was found to be 36% in TTT-co-P3HT:PC 71 BM and 58% in P3HT:PC 71 BM.…”

Section: Optical and Electrochemical Characterizationmentioning

confidence: 99%

“…When comparing two blends, the results show that electron/hole pair separation and charge transfer is sufficient in P3HT:PC 71 BM than in TTT-co-P3HT:PC 71 BM. Photoluminescence spectroscopy has been widely used to study electron/hole pair separation at the interface of donor and acceptor materials using the quenching effect [33][34][35][36]. Figure 4 depicts the photoluminescence results of (A) TTT-co-P3HT and TTT-co-P3HT:PC71BM and (B) P3HT and P3HT:PC71BM obtained using chlorobenzene as a solvent.…”

Section: Optical and Electrochemical Characterizationmentioning

confidence: 99%

Synthesis and Photovoltaics of Novel 2,3,4,5-Tetrathienylthiophene-co-poly(3-hexylthiophene-2,5-diyl) Donor Polymer for Organic Solar Cell

et al. 2020

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This report focuses on the synthesis of novel 2,3,4,5-tetrathienylthiophene-co-poly(3-hexylthiophene-2,5-diyl) (TTT-co-P3HT) as a donor material for organic solar cells (OSCs). The properties of the synthesized TTT-co-P3HT were compared with those of poly(3-hexylthiophene-2,5-diyl (P3HT). The structure of TTT-co-P3HT was studied using nuclear magnetic resonance spectroscopy (NMR) and Fourier-transform infrared spectroscopy (FTIR). It was seen that TTT-co-P3HT possessed a broader electrochemical and optical band-gap as compared to P3HT. Cyclic voltammetry (CV) was used to determine lowest unoccupied molecular orbital (LUMO) and highest occupied molecular orbital (HOMO) energy gaps of TTT-co-P3HT and P3HT were found to be 2.19 and 1.97 eV, respectively. Photoluminescence revealed that TTT-co-P3HT:PC71BM have insufficient electron/hole separation and charge transfer when compared to P3HT:PC71BM. All devices were fabricated outside a glovebox. Power conversion efficiency (PCE) of 1.15% was obtained for P3HT:PC71BM device and 0.14% was obtained for TTT-co-P3HT:PC71BM device. Further studies were done on fabricated OSCs during this work using electrochemical methods. The studies revealed that the presence of poly(3,4-ethylenedioxythiophene) polystyrene sulfonate (PEDOT:PSS) on the surface of indium tin oxide (ITO) causes a reduction in cyclic voltammogram oxidation/reduction peak current and increases the charge transfer resistance in comparison with a bare ITO. We also examined the ITO/PEDOT:PSS electrode coated with TTT-co-P3HT:PC71BM, TTT-co-P3HT:PC71BM/ZnO, P3HT:PC71BM and P3HT:PC71BM/ZnO. The study revealed that PEDOT:PSS does not completely block electrons from active layer to reach the ITO electrode.

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“…Vivian John found intermixed phase in poly [(9,9-di-n-octylfluorenyl-2,7-diyl)-alt-(benzo [2,1,3]thiadiazol-4,8-diyl)]:Cobalt(II) salicylaldimine metallodendrimer (F8BT:Co-PPI) blends, and the miscibility was even better than that of F8BT:PC 61 BM blend. 44 The intermixed phase was also observed in all-polymer blend, that is, tris(thienylenevinylene):poly[N-(1octylnonyl)carbazole-2,-7-diyl-alt-N,N 0 -dihexyl-1,4,5,8naphthalene diimide-2,6-diyl] (TTV7:PC-NDI) blend, in which two polymers were intermiscible in their amorphous phases. 45 Consequently, the three-phase model substituted the two-phase model, and further understanding of the three-phase model may guide the direction of morphology control.…”

mentioning

confidence: 93%

Recent advances in intermixed phase of organic solar cells: Characterization, regulating strategies and device applications

Liang

Yao

et al. 2021

Journal of Polymer Science

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Organic solar cells (OSCs) have unique advantages of low-cost solution processing, light weight, flexibility, and semitransparency, which is a promising photovoltaic technology. The intermixed phase plays a key role in determining the power conversion efficiencies (PCE) of OSCs. The intermixed phase is an amorphous region, where the donor and acceptor mix at the molecular level.Great efforts have been devoted to optimize the content and the composition of the intermixed phase. This perspective focuses on the functions of intermixed phase and elaborates the relationship between intermixed phase behavior and photophysical process, in particular, the exciton dissociation and charge transport. Then the characterization methods, including quantitative and qualitative characterizations, for the content and composition of intermixed phases are introduced. Meanwhile, this review also introduces the strategies to control the intermixed phase behavior, such as adjusting the miscibility between donor and acceptor, changing the ratio of donor to acceptor, regulating the crystallinity and so on. Moreover, representative examples are given and discussed to understand the key parameters on tuning the intermixed phase behavior. Finally, a future controlling and development of intermixed phase behavior is briefly outlooked, which may help to achieve high PCE of OSCs.

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Photoluminescence quenching of poly(octylfluorenylbenzothiadiazole) luminophore by n-type cobalt(II) salicylaldimine metallodendrimer

Cited by 6 publications

References 46 publications

Microscopic, Spectroscopic, and Electrochemical Characterization of Novel Semicrystalline Poly(3-hexylthiophene)-Based Dendritic Star Copolymer

Microscopic, Spectroscopic, and Electrochemical Characterization of Novel Semicrystalline Poly(3-hexylthiophene)-Based Dendritic Star Copolymer

Synthesis and Photovoltaics of Novel 2,3,4,5-Tetrathienylthiophene-co-poly(3-hexylthiophene-2,5-diyl) Donor Polymer for Organic Solar Cell

Recent advances in intermixed phase of organic solar cells: Characterization, regulating strategies and device applications

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