Inferring changes in π-stack mobility induced by aging from vibronic transitions in poly(3-hexylthiophene-2,5-diyl) films

Pereira, Vilany Santana; Leal, Luciano Almeida; Ribeiro, Luiz Antônio; Blawid, Stefan

doi:10.1016/j.synthmet.2018.12.017

Cited by 2 publications

(3 citation statements)

References 48 publications

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“…Insight into the packing structure of P3Br x HT can be extracted from the ratio of the 0–0 and 0–1 peak transitions ( A 0‐0 / A 0‐1 ) and is a key piece for elucidating functionalization effects on the backbone arrangement because a larger ratio is tied to improved electrical performance . All absorbance spectra of the films exhibited the H‐aggregate character with A 0‐0 / A 0‐1 < 1 indicating greater interchain interactions by π–π stacking, whereas J‐aggregate character with A 0‐0 / A 0‐1 > 1 would be attributed to dominant intrachain interactions by planar, long‐range order (Table ) .…”

Section: Resultsmentioning

confidence: 90%

Enhanced miscibility and strain resistance of blended elastomer/π‐conjugated polymer composites through side chain functionalization towards stretchable electronics

Pakhnyuk

Onorato

Steiner

et al. 2019

Polymer International

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This work presents improved compatibility in an elastomer/π‐conjugated polymer blend through side chain functionalization of the electronic polymer. Poly[(3‐(6‐bromohexyl)thiophene)‐ran‐(3‐hexylthiophene)] (P3BrxHT, x = 0%–100%) was synthesized (i) to improve miscibility with polybutadiene (PB) elastomer through altered π–π interactions and (ii) to covalently bond across phase‐segregated interfaces. Functionalization led to morphology with reduced domain sizes to improve crack onset strain from 7% to 40%. Furthermore, UV‐activated crosslinking reinforced mechanically weak interfaces and yielded at least an additional 40% increase in crack onset strain. Charge mobility in PB/P3BrxHT organic field‐effect transistors showed minimal dependence on bromide concentration and no negative effects from crosslinking. Functionalization was an effective method to reduce brittleness in PB/P3BrxHT blends through morphology modification and crosslinking to improve stability towards strain for potential stretchable electronic applications. © 2019 Society of Chemical Industry

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Section: Resultsmentioning

confidence: 90%

Enhanced miscibility and strain resistance of blended elastomer/π‐conjugated polymer composites through side chain functionalization towards stretchable electronics

Pakhnyuk

Onorato

Steiner

et al. 2019

Polymer International

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“…In addition, comparing the P3HT:MAPbI 3 :quartz films of different thicknesses/spin speed, interchain coupling strengthens (the 0-0-0-1 PL ratio decreases) and intrachain coupling weakens (the 0-2-0-1 PL ratio increases) for the two thinnest films spun at thr highest spin speeds (solid red and yellow lines in Fig. 4) 66,67 .…”

Section: Discussionmentioning

confidence: 95%

“…Such changes in interaction strengths can be explained by differences in film morphology, resulting from variations in interface interactions and spin speeds. For example, weaker interchain (through-space) interactions and stronger intrachain (through-bond) interactions have been observed when P3HT forms a two-phase morphology of interconnected crystalline and amorphous phases, compared with films comprising a chain-extended morphology of layered stacks exhibiting high torsional disorder 66 , 67 . The evolution of the PL lineshape we observe for P3HT films on MAPbI 3 :quartz thus most likely derives from the presence of an amorphous phase formed under some conditions near the interface to MAPbI 3 , which causes a decrease in interchain interaction compared to the films deposited on a smoother quartz substrate 42 , 68 .…”

Section: Discussionmentioning

confidence: 99%

Efficient energy transfer mitigates parasitic light absorption in molecular charge-extraction layers for perovskite solar cells

et al. 2020

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Organic semiconductors are commonly used as charge-extraction layers in metal-halide perovskite solar cells. However, parasitic light absorption in the sun-facing front molecular layer, through which sun light must propagate before reaching the perovskite layer, may lower the power conversion efficiency of such devices. Here, we show that such losses may be eliminated through efficient excitation energy transfer from a photoexcited polymer layer to the underlying perovskite. Experimentally observed energy transfer between a range of different polymer films and a methylammonium lead iodide perovskite layer was used as basis for modelling the efficacy of the mechanism as a function of layer thickness, photoluminescence quantum efficiency and absorption coefficient of the organic polymer film. Our findings reveal that efficient energy transfer can be achieved for thin (≤10 nm) organic charge-extraction layers exhibiting high photoluminescence quantum efficiency. We further explore how the morphology of such thin polymer layers may be affected by interface formation with the perovskite.

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Inferring changes in π-stack mobility induced by aging from vibronic transitions in poly(3-hexylthiophene-2,5-diyl) films

Cited by 2 publications

References 48 publications

Enhanced miscibility and strain resistance of blended elastomer/π‐conjugated polymer composites through side chain functionalization towards stretchable electronics

Enhanced miscibility and strain resistance of blended elastomer/π‐conjugated polymer composites through side chain functionalization towards stretchable electronics

Efficient energy transfer mitigates parasitic light absorption in molecular charge-extraction layers for perovskite solar cells

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