Revealing structure formation in PCPDTBT by optical spectroscopy

Scharsich, Christina; Fischer, Florian S. U.; Wilma, Kevin; Hildner, Richard; Ludwigs, Sabine; Köhler, Anna

doi:10.1002/polb.23780

Cited by 46 publications

(71 citation statements)

References 75 publications

(168 reference statements)

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“…6 Recent spectroscopic studies showed that these polymers are prone to locale crystallization. 51 The associated improved inter-as well as intra chain ordering might establish a two-dimensional network of hole transport near the donor-acceptor interface. A combined spectroscopic, structural and photo-electric study could provide a quantitative link for a structure-property relation.…”

Section: Discussionmentioning

confidence: 99%

A Combined Theoretical and Experimental Study of Dissociation of Charge Transfer States at the Donor–Acceptor Interface of Organic Solar Cells

et al. 2015

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The observation that in efficient organic solar cells almost all electron-hole pairs generated at the donor-acceptor interface escape from their mutual coulomb potential remains to be a conceptual challenge. It has been argued that it is the excess energy dissipated in the course of electron or hole transfer at the interface that assists this escape process. The current work demonstrates that this concept is unnecessary to explain the field dependence of electron-hole dissociation. It is based upon the formalism developed by Arkhipov and co-workers as well as Baranovskii and co-workers. The key idea is that the binding energy of the dissociating "cold" charge-transfer state is reduced by delocalization of the hole along the polymer chain, quantified in terms of an "effective mass", as well as the fractional strength of dipoles existent at the interface in the dark. By covering a broad parameter space, we determine the conditions for efficient electron-hole dissociation. Spectroscopy of the charge-transfer state on bilayer solar cells as well as measurements of the field dependence of the dissociation yield over a broad temperature range support the theoretical predictions.

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Section: Discussionmentioning

confidence: 99%

A Combined Theoretical and Experimental Study of Dissociation of Charge Transfer States at the Donor–Acceptor Interface of Organic Solar Cells

et al. 2015

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“…[13][14][24][25][26] For these polymers, the process of aggregation upon cooling was found to proceed in three distinct phases, i.e. (i) a swelling up and planarization upon cooling,…”

Section: Quantum Chemical Calculationsmentioning

confidence: 99%

The effect of intermolecular interaction on excited states in p − DTS(FBTTH2)2

Reichenberger

Love

Rudnick

et al. 2016

The Journal of Chemical Physics

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Using optical spectroscopy in solution and thin film, and supported by quantum chemical calculations, we investigated the aggregation process of the donor-acceptor type molecule p-DTS(FBTTH 2 ) 2 . We demonstrate that cooling a solution induces a disorder-order phase transition that proceeds in three stages analogous to the steps observed in semi-rigid conjugated polymers. By analyzing the spectra we are able to identify the spectral signature of monomer and aggregate in absorption and emission. From this we find that in films the fraction of aggregates is near 100 % which is in contrast to films made from semi-rigid conjugated polymers.3

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“…To acquire the insight and then administer the underlying morphological properties of these polymers still remains an uphill task for the researchers of the present era. Many studies have been performed to alter physical properties of PCPDTBT by varying fabrication techniques and controlling ambient parameters [23–25]. Some other techniques, for instance controlling a solvent vapor annealing process to yield high crystallinity quite for opto-electronic devices, have also been adopted [19].…”

Section: Introductionmentioning

confidence: 99%

Determining the Effect of Centrifugal Force on the Desired Growth and Properties of PCPDTBT as p-Type Nanowires

et al. 2017

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In this study, low-bandgap polymer poly{[4,4-bis(2-ethylhexyl)-cyclopenta-(2,1-b;3,4-b′)dithiophen]-2,6-diyl-alt-(2,1,3-benzothiadiazole)−4,7-diyl} (PCPDTBT) nanostructures have been synthesized via a hard nanoporous alumina template of centrifugal process. Centrifuge has been used to infiltrate the PCPDTBT solution into the nanoporous alumina by varying the rotational speeds. The rotational speed of centrifuge is directly proportional to the infiltration force that penetrates into the nanochannels of the template. By varying the rotational speed of centrifuge, different types of PCPDTBT nanostructures are procured. Infiltration force created during the centrifugal process has been found a dominant factor in tuning the morphological, optical, and structural properties of PCPDTBT nanostructures. The field emission scanning electron microscopy (FESEM) images proved the formation of nanotubes and nanowires. The energy-dispersive X-ray spectroscope (EDX) analysis showed that the nanostructures were composed of PCPDTBT with complete dissolution of the template.

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Revealing structure formation in PCPDTBT by optical spectroscopy

Cited by 46 publications

References 75 publications

A Combined Theoretical and Experimental Study of Dissociation of Charge Transfer States at the Donor–Acceptor Interface of Organic Solar Cells

A Combined Theoretical and Experimental Study of Dissociation of Charge Transfer States at the Donor–Acceptor Interface of Organic Solar Cells

The effect of intermolecular interaction on excited states in p − DTS(FBTTH2)2

Determining the Effect of Centrifugal Force on the Desired Growth and Properties of PCPDTBT as p-Type Nanowires

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