Photovoltaic Polymer Materials

Assender, Hazel E.; Barkhouse, Aaron R.

doi:10.1002/9780470594179.ch8

Cited by 3 publications

(1 citation statement)

References 73 publications

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“…The use of chloroform as the casting solvent could therefore have played a detrimental effect on the morphology of the devices as the fast evaporation of the solvent resulted in material clustering. In addition, the tendency of both G1PPT-co-P3HT and PDI-co-Carbazole to self-aggregate during film deposition can also account for the isolation/trapping of the charges within the macromolecule lattices [ 78 , 79 ]. G1PPT-co-P3HT:PDI-co-Carbazole (2:1) device FF of 0.11, smaller than those of other devices may be due to short-conjugated length and amorphous structure within G1PPT-co-P3HT.…”

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%