Effects of the graphene content on the conversion efficiency of P3HT:Graphene based organic solar cells

Bkakri, R.; Chehata, N.; Ltaief, A.; Kusmartseva, O.; Kusmartsev, F. V.; Song, Mo; Bouazizi, Abdelaziz

doi:10.1016/j.jpcs.2015.05.020

Cited by 29 publications

(12 citation statements)

References 33 publications

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“…In pristine graphene the 2D band is located at 2722 cm −1 and it is shifted at 2710, and 2708 cm −1 for monolayer and bilayer MoS 2 , respectively. There are two factors that can influence the Raman 2D band position: charge transfer 45 51 52 , and strain 53 54 55 . In our Raman measurements, the spectra were taken at room temperature and the laser power was low (~5 mW) to avoid the influence of laser heating.…”

Section: Resultsmentioning

confidence: 99%

Large area molybdenum disulphide- epitaxial graphene vertical Van der Waals heterostructures

Pierucci¹,

Henck²,

Naylor³

et al. 2016

Sci Rep

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Two-dimensional layered transition metal dichalcogenides (TMDCs) show great potential for optoelectronic devices due to their electronic and optical properties. A metal-semiconductor interface, as epitaxial graphene - molybdenum disulfide (MoS2), is of great interest from the standpoint of fundamental science, as it constitutes an outstanding platform to investigate the interlayer interaction in van der Waals heterostructures. Here, we study large area MoS2-graphene-heterostructures formed by direct transfer of chemical-vapor deposited MoS2 layer onto epitaxial graphene/SiC. We show that via a direct transfer, which minimizes interface contamination, we can obtain high quality and homogeneous van der Waals heterostructures. Angle-resolved photoemission spectroscopy (ARPES) measurements combined with Density Functional Theory (DFT) calculations show that the transition from indirect to direct bandgap in monolayer MoS2 is maintained in these heterostructures due to the weak van der Waals interaction with epitaxial graphene. A downshift of the Raman 2D band of the graphene, an up shift of the A1g peak of MoS2 and a significant photoluminescence quenching are observed for both monolayer and bilayer MoS2 as a result of charge transfer from MoS2 to epitaxial graphene under illumination. Our work provides a possible route to modify the thin film TDMCs photoluminescence properties via substrate engineering for future device design.

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Section: Resultsmentioning

confidence: 99%

Large area molybdenum disulphide- epitaxial graphene vertical Van der Waals heterostructures

Pierucci¹,

Henck²,

Naylor³

et al. 2016

Sci Rep

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“…GO thus is ideally suited to self‐assemble hierarchical GO structures, such as GO films and papers, as well as to complex with many organic materials. In combination with conjugated polymers GO reveals its value as acceptor material and provides enhanced conducting and charge‐transfer properties . GO films also serve as hole‐transport and electron‐transport layer in organic photovoltaic devices .…”

Section: Introductionmentioning

confidence: 99%

Conjugated Polymer Nanoparticle–Graphene Oxide Charge‐Transfer Complexes

Istif

Hernández‐Ferrer

Urriolabeitia

et al. 2018

Adv Funct Materials

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The game-changing role of graphene oxide (GO) in tuning the excitonic behavior of conjugated polymer nanoparticles is described for the first time. This is demonstrated by using poly(3-hexylthiophene) (P3HT) as a benchmark conjugated polymer and employing an in situ reprecipitation approach resulting in P3HT nanoparticles (P3HT NPs ) with sizes of 50-100 nm in intimate contact with GO. During the self-assembly process, GO changes the crystalline packing of P3HT chains in the forming P3HT NPs from H to H/J aggregates exhibiting exciton coupling constants as low as 2 meV, indicating favorable charge separation along the P3HT chains. Concomitantly, π-π interface interactions between the P3HT NPs and GO sheets are established resulting in the creation of P3HT NPs -GO charge-transfer complexes whose energy bandgaps are lowered by up to 0.5 eV. Moreover, their optoelectronic properties, preestablished in the liquid phase, are retained when processed into thin films from the stable aqueous dispersions, thus eliminating the critical dependency on external processing parameters. These results can be transferred to other types of conjugated polymers. Combined with the possibility of employing water based "green" processing technologies, chargetransfer complexes of conjugated polymer nanoparticles and GO open new pathways for the fabrication of improved optoelectronic thin film devices.

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“…In addition, it has been even reported that spin coating produces more easily higher-quality films compared to dip coating (i.e., more homogeneous films) [16]. In the present work, it is important to remark that the photovoltaic performance of the P3HT:SPFGraphene and P3HT:SPFGraphene:AgNs active layers obtained via dip coating was superior to that reported by Bkakri et al [14] who tested the performance of P3HT/Au and P3HT:Graphene/Au composites obtained by spin coating, which means that it is possible to use such low cost deposition production technique to obtain competitive films to be used as active layer.…”

Section: Resultsmentioning

confidence: 39%

“…Regarding graphene, the absence of D band indicates the presence of a well-ordered material. It also can be concluded that graphene is present as reduced-graphene due to annealing treatment at 110 ∘ C. On the other hand, the G band of graphene was shifted to 1646 cm −1 due to the charge transfer between the donor and the acceptor of electrons (i.e., P3HT and SPFGraphene) [13,14].…”

Section: Resultsmentioning

confidence: 99%

Morphology Effect of Silver Nanostructures on the Performance of a P3HT:Graphene:AgNs-Based Active Layer Obtained via Dip Coating

Gómez-Acosta

Barquera-Bibiano

López-Naranjo³

et al. 2016

Journal of Nanomaterials

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We report the effect of the use of different silver nanostructures (AgNs) layers deposited via dip coating onto a poly(3-hexylthiophene) (P3HT) and solution processable functionalized graphene (SPFGraphene) composite film intended to be used as active layer in BHJ devices. SPFGraphene was added to P3HT in a ratio of 1.5 wt%. The best results were achieved when a layer of silver nano-pseudospheres (AgNPSs) obtained after 10 immersion cycles was used as coating; in this case the highest light trapping and efficiency percent (η=0.23%) were achieved. This means an increase of ~11.3% in comparison with the efficiency of the noncoated P3HT:SPFGraphene composite. Results also indicate that graphene was successfully functionalized in order to obtain appropriate dispersion in P3HT and that such conjugated polymer remained unaltered after the addition of SPFGraphene. Finally, it can be concluded that the electrical properties of the as-synthesized films are dependent on the shape and concentration of the AgNs deposited via dip coating.

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Effects of the graphene content on the conversion efficiency of P3HT:Graphene based organic solar cells

Cited by 29 publications

References 33 publications

Large area molybdenum disulphide- epitaxial graphene vertical Van der Waals heterostructures

Large area molybdenum disulphide- epitaxial graphene vertical Van der Waals heterostructures

Conjugated Polymer Nanoparticle–Graphene Oxide Charge‐Transfer Complexes

Morphology Effect of Silver Nanostructures on the Performance of a P3HT:Graphene:AgNs-Based Active Layer Obtained via Dip Coating

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