Understanding charge carrier dynamics in a P3HT:FLR blend

Patel, Jessica; Sharma, Abhishek; Chauhan, Mihirsinh; Aatif, Md.; Vashistha, Nikita; Kumar, Mahesh; Tripathi, Brijesh; Chand, Suresh; Tiwari, J. P.; Pandey, Manoj Kumar

doi:10.1039/c8cp05518a

Cited by 9 publications

(11 citation statements)

References 79 publications

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“…These subtle conformational differences have direct consequences on the head-to-tail interactions of the transition dipole moments of the chromophores, which ultimately influence the spectral line shapes [37]. The ratio of 0-0 and 0-1 peak absorbance is related to the free exciton bandwidth (W) [38] and the energy of the intermolecular vibration Ep. We calculated W of these blended films using weakly interchain-coupled modified Frank-Condon model [28,39], ≈ The ratio of 0-0 and 0-1 peak absorbance is related to the free exciton bandwidth (W) [38] and the energy of the intermolecular vibration E p .…”

Section: Resultsmentioning

confidence: 99%

“…The ratio of 0-0 and 0-1 peak absorbance is related to the free exciton bandwidth (W) [38] and the energy of the intermolecular vibration Ep. We calculated W of these blended films using weakly interchain-coupled modified Frank-Condon model [28,39], ≈ The ratio of 0-0 and 0-1 peak absorbance is related to the free exciton bandwidth (W) [38] and the energy of the intermolecular vibration E p . We calculated W of these blended films using weakly interchain-coupled modified Frank-Condon model [28,39],…”

Section: Resultsmentioning

confidence: 99%

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Aggregation Controlled Charge Generation in Fullerene Based Bulk Heterojunction Polymer Solar Cells: Effect of Additive

et al. 2020

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Optimization of charge generation in polymer blends is crucial for the fabrication of highly efficient polymer solar cells. While the impacts of the polymer chemical structure, energy alignment, and interface on charge generation have been well studied, not much is known about the impact of polymer aggregation on charge generation. Here, we studied the impact of aggregation on charge generation using transient absorption spectroscopy, neutron scattering, and atomic force microscopy. Our measurements indicate that the 1,8-diiodooctane additive can change the aggregation behavior of poly(benzodithiophene-alt-dithienyl difluorobenzotriazole (PBnDT-FTAZ) and phenyl-C61-butyric acid methyl ester (PCBM)polymer blends and impact the charge generation process. Our observations show that the charge generation can be optimized by tuning the aggregation in polymer blends, which can be beneficial for the design of highly efficient fullerene-based organic photovoltaic devices.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Aggregation Controlled Charge Generation in Fullerene Based Bulk Heterojunction Polymer Solar Cells: Effect of Additive

et al. 2020

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“…Interestingly, very similar trends with the solvent have recently been reported for a P3HT:NFA blend. [60] Therefore, we assume that our results are generally valid for P3HT and similar semicrystalline systems.…”

Section: Aggregation and Phase Puritymentioning

confidence: 94%

How to Reduce Charge Recombination in Organic Solar Cells: There are Still Lessons to Learn from P3HT:PCBM

Wilken

Scheunemann

Dahlström

et al. 2021

Adv Elect Materials

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However, despite the wide variety of materials that are now available, there are still only a few systems that maintain their full performance at junction thicknesses of 300 nm and more. [4][5][6] Compatibility with thick active layers, as well as a general tolerance to thickness variations, is considered an important prerequisite for the low-cost production of OPVs using printing techniques. [7,8] The main problem with increasing thickness is the slowdown of charge collection, which makes photogenerated carriers more vulnerable to recombination. [9][10][11] This is particularly true for NFA-based systems, which typically have low carrier mobilities of 10 −9 to 10 −8 m 2 V −1 s −1

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“…Interestingly, very similar trends with the solvent have recently been reported for a P3HT:NFA blend. [55] Therefore, we assume that our results are generally valid for P3HT and similar semicrystalline systems.…”

Section: Aggregation and Phase Puritymentioning

confidence: 94%

How to Reduce Charge Recombination in Organic Solar Cells: There Are Still Lessons to Learn from P3HT:PCBM

Wilken,

Scheunemann,

Dahlström

et al. 2020

Preprint

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Suppressing charge recombination is key for organic solar cells to become commercial reality. However, there is still no conclusive picture of how recombination losses are influenced by the complex nanoscale morphology. Here, new insight is provided by revisiting the P3HT:PCBM blend, which is still one of the best performers regarding reduced recombination. By changing small details in the annealing procedure, two model morphologies were prepared that vary in phase separation, molecular order and phase purity, as revealed by electron tomography and optical spectroscopy. Both systems behave very similarly with respect to charge generation and transport, but differ significantly in bimolecular recombination. Only the system containing P3HT aggregates

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Understanding charge carrier dynamics in a P3HT:FLR blend

Abstract: In organic photovoltaics, a good solvent-material combination plays a pivotal role in enhancing the performance.

Cited by 9 publications

References 79 publications

Aggregation Controlled Charge Generation in Fullerene Based Bulk Heterojunction Polymer Solar Cells: Effect of Additive

Aggregation Controlled Charge Generation in Fullerene Based Bulk Heterojunction Polymer Solar Cells: Effect of Additive

How to Reduce Charge Recombination in Organic Solar Cells: There are Still Lessons to Learn from P3HT:PCBM

How to Reduce Charge Recombination in Organic Solar Cells: There Are Still Lessons to Learn from P3HT:PCBM

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