Charge transport in a two-dimensional molecular organic semiconductor

Arumugam, Sasikumar; Wright, Iain A.; Inigo, Anto R.; Gambino, Salvatore; Howells, Calvyn Travis; Kanibolotsky, Alexander L.; Skabara, Peter J.; Samuel, Ifor D. W.

doi:10.1039/c3tc31670j

Cited by 18 publications

(15 citation statements)

References 25 publications

(27 reference statements)

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“…Other parameters governing performance such as short-circuit current density ( J sc ), and open-circuit voltage ( V oc ) of these devices, are remarkable, considering the size of aggregates observed within the active layer, for example an open-circuit voltage of 0.71 V, which is greater than that reported for OPVs with poly(3-hexylthiophene) [ 53 ]. These aggregates, observed by means of a profiler and wide-field microscopy, are detrimental to device performance [ 54 ]. Hence, the development of similar compounds with improved solubility and a more favourable morphology would hopefully lead to more efficient OPVs.…”

Section: Discussionmentioning

confidence: 99%

Solution processable diketopyrrolopyrrole (DPP) cored small molecules with BODIPY end groups as novel donors for organic solar cells

Cortizo‐Lacalle¹,

Howells²,

Pandey³

et al. 2014

Beilstein J. Org. Chem.

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SummaryTwo novel triads based on a diketopyrrolopyrrole (DPP) central core and two 4,4-difluoro-4-bora-3a,4a-diaza-s-indacene (BODIPY) units attached by thiophene rings have been synthesised having high molar extinction coefficients. These triads were characterised and used as donor materials in small molecule, solution processable organic solar cells. Both triads were blended with PC71BM as an acceptor in different ratios by wt % and their photovoltaic properties were studied. For both the triads a modest photovoltaic performance was observed, having an efficiency of 0.65%. Moreover, in order to understand the ground and excited state properties and vertical absorption profile of DPP and BODIPY units within the triads, theoretical DFT and TDDFT calculations were performed.

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Section: Discussionmentioning

confidence: 99%

Solution processable diketopyrrolopyrrole (DPP) cored small molecules with BODIPY end groups as novel donors for organic solar cells

Cortizo‐Lacalle¹,

Howells²,

Pandey³

et al. 2014

Beilstein J. Org. Chem.

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“…However, graphene correlated investigations in electrochemistry represent a fascinating problem and requirements to be discovered more. [p] 0.006 x 10 3 0.009 x 10 3 -0.19 x 10 3 And 0.25 x 10 3 -2240 Dopamine 165 Gr/β-CD [q] 0.027 -Dopamine 166 ITO/NÀ Gr film [r] 0.005 2-240 Dopamine 167 PEDOT/LS-Gr [s] 0.33 1-150 Ascorbic acid 168 CdSe-ZnS QD/GO [t] 0.568 x 10 3 0 to 0.13 Ascorbic acid 169 3,4-EDOT/rGr [u] 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57…”

Section: Challenges and Conclusionmentioning

confidence: 99%

Electrochemical Sensors and Biosensors Based on Graphene Functionalized with Metal Oxide Nanostructures for Healthcare Applications

et al. 2019

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Graphene has attracted wide consideration in recent years to the assembly of sensitive sensors and biosensors due to its unique and remarkable physical and electrochemical properties. Moreover, graphene, as an essential two‐dimensional carbon material with remarkably high quartz and electronic superiority, has also received significant research attention. This review presents the different synthesis techniques of graphene; graphene functionalized based electrochemical sensors and biosensors for various health care appellations. Further, were discussed on the basis of enhanced catalytic activity, improved detection limit in conjunction with sensitivity, and selectivity. Synergistic action of graphene and metal oxide nanostructure has contributed towards high activity as a biosensing material. The results with different sensors and biosensors for the detection of significant biomarkers such as protein sensor, electrochemical immune sensor, phytochrome sensor, cholesterol biosensor glucose, hydrogen peroxide, and nicotinamide adenine dinucleotide detection sensor etc., and highlighted the use of graphene and functionalized graphene in different sensing platforms. Finally, the challenges related to less aggregated graphene‐based electrochemical sensors and biosensors as well as future research directions are discussed.

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“…69 Such morphology changes can alter the topography of the HEL, which in turn can influence OPV performances. 88,[114][115][116][117][118] To assess such an effect with PFI mixing, atomic force microscopy (AFM) was performed (Section ESI-1.3.1 †). Fig.…”

Section: Pfi-modified Pedot:pssmentioning

confidence: 99%

Influence of perfluorinated ionomer in PEDOT:PSS on the rectification and degradation of organic photovoltaic cells

et al. 2018

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Poly (3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) is widely used to build optoelectronic devices. However, as a hygroscopic waterbased acidic material, it brings major concerns for stability and degradation, resulting in an intense effort to replace it in organic photovoltaic (OPV) devices. In this work, we focus on the perfluorinated ionomer (PFI) polymeric additive to PEDOT:PSS. We demonstrate that it can reduce the relative amplitude of OPV device burn-in, and find two distinct regimes of influence. At low concentrations there is a subtle effect on wetting and work function, for instance, with a detrimental impact on the device characteristics, and above a threshold it changes the electronic and device properties. The abrupt threshold in the conducting polymer occurs for PFI concentrations greater than or equal to the PSS concentration and was revealed by monitoring variations in transmission, topography, work-function, wettability and OPV device characteristics. Below this PFI concentration threshold, the power conversion efficiency (PCE) of OPVs based on poly(3-hexylthiophene-2,5-diyl):[6,6]-phenyl-C61-butyric acid methyl ester (P3HT:PCBM) are impaired largely by low fill-factors due to poor charge extraction. Above the PFI concentration threshold, we recover the PCE before it is improved beyond the pristine PEDOT:PSS layer based OPV devices. Supplementary to the performance enhancement, PFI improves OPV device stability and lifetime. Our degradation study leads to the conclusion that PFI prevents water from diffusing to and from the hygrosopic PEDOT:PSS layer, which slows down the deterioration of the PEDOT:PSS layer and the aluminum electrode. These findings reveal mechanisms and opportunities that should be taken into consideration when developing components to inhibit OPV degradation. 35-38 whilst oxidation, delamination and interfacial effects may occur at the electrodes. 39-45 Metal ion diffusion from the electrodes and changes in morphology have also been reported in both the active and poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) layers. C. T. Howells et al. 2/14organic optoelectronics between indium tin oxide (ITO) anodes and active layers. [54][55][56][57] With its metal properties, 58-62 PEDOT:PSS and similar conducting layers are part of the contact and are sometimes called hole injection layers in light emitting devices. By analogy, in this solar cell work, PEDOT:PSS is then referred to as a hole extraction layer (HEL) rather than a hole transport layer or interlayer. The large ionisation potential promotes an Ohmic contact and improves the built-in electric field, whilst high conductivity and transparency ensure minimal resistive and optical losses, respectively. 53,63,64 The HEL also helps to prevent metal ion diffusion from the ITO into the active layer and the cathode from short-circuiting the anode. 50 The PSS is a water-soluble polyelectrolyte that serves as a charge balancing dopant during the polymerisation of EDOT monomers. It oxidises and stabi...

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Charge transport in a two-dimensional molecular organic semiconductor

Cited by 18 publications

References 25 publications

Solution processable diketopyrrolopyrrole (DPP) cored small molecules with BODIPY end groups as novel donors for organic solar cells

Solution processable diketopyrrolopyrrole (DPP) cored small molecules with BODIPY end groups as novel donors for organic solar cells

Electrochemical Sensors and Biosensors Based on Graphene Functionalized with Metal Oxide Nanostructures for Healthcare Applications

Influence of perfluorinated ionomer in PEDOT:PSS on the rectification and degradation of organic photovoltaic cells

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