Laser induced nucleation of plasmonic nanoparticles on two-dimensional nanosheets for organic photovoltaics

Sygletou, Maria; Tzourmpakis, Pavlos; Petridis, C.; Konios, Dimitrios; Fotakis, C.; Kymakis, Emmanuel; Stratakis, Emmanuel

doi:10.1039/c5ta09199c

Cited by 50 publications

(29 citation statements)

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“…Among the most attractive features of TMD compounds is that their electronic properties can vary from metallic to those of a wide band gap semiconductor depending on the structure, composition and dimensionality, while their band structure can be easily tuned by applying stress 6 . Owing to such layer-dependent electronic structure, TMDs exhibit extraordinary optoelectronic properties 7,8 as well as potential for enhanced performance in applications such as photodetectors 9 , photovoltaics 10,11 and non-linear optical components 12 .…”

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confidence: 99%

Room temperature observation of biexcitons in exfoliated WS2 monolayers

Paradisanos

Germanis

Pelekanos

et al. 2017

Applied Physics Letters

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Single layers of WS2 are direct gap semiconductors with high photoluminescence (PL) yield holding great promise for emerging applications in optoelectronics. The spatial confinement in a 2D monolayer together with the weak dielectric screening lead to huge binding energies for the neutral excitons as well as other excitonic complexes, such as trions and biexcitons whose binding energies scale accordingly. Here, we report on the existence of biexcitons in mechanically exfoliated WS2 flakes from 78 K up to room temperature. Performing temperature and power dependent PL measurements, we identify the biexciton emission channel through the superlinear behavior of the integrated PL intensity as a function of the excitation power density. On the contrary, neutral and charged excitons show a linear to sublinear dependence in the whole temperature range. From the energy difference between the emission channels of the biexciton and neutral exciton, a biexciton binding energy of 65-70 meV is determined. *Corresponding authors: gnk@materials.uoc.gr ; stratak@iesl.forth.gr 2 The interest on two-dimensional (2D) materials has been steadily increasing since the discovery of graphene, a material with fascinating properties and great potential for various applications 1 . Transition metal dichalcogenides (TMDs) with the form MX2 (M = Mo, W, Ti, etc and X = S, Se, Te) exhibit a structure very similar to that of graphene and have attracted significant attention of the scientific community 2-5 for a number of reasons. Among the most attractive features of TMD compounds is that their electronic properties can vary from metallic to those of a wide band gap semiconductor depending on the structure, composition and dimensionality, while their band structure can be easily tuned by applying stress 6 . Owing to such layer-dependent electronic structure, TMDs exhibit extraordinary optoelectronic properties 7,8 as well as potential for enhanced performance in applications such as photodetectors 9 , photovoltaics 10,11 and non-linear optical components 12 .Among their prominent optical properties, TMD monolayers show strong PL in the visible and near-infrared spectral range, due to the transition from indirect band gap semiconductors in their bulk and few-layer forms, to direct band gap semiconductors in the monolayer limit 13 . Besides this, the spatial confinement of carriers in a 2D monolayer lattice and the weak dielectric screening, give rise to unusually strong excitonic effects and high binding energies [14][15][16] . These properties favor the stability of a variety of excitonic quasiparticles with extremely large binding energies, including neutral excitons with binding energies of several hundred meV 17,18 , charged excitons (trions) was shown that the biexciton emission in WS2 can be electrically tuned 27 , which is of great importance for TMDs-based photonic devices.The unusually strong excitonic effects in TMDs strongly suggest an enhanced thermal stability of biexciton emission. While neutral and charged excitons have...

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confidence: 99%

Room temperature observation of biexcitons in exfoliated WS2 monolayers

Paradisanos

Germanis

Pelekanos

et al. 2017

Applied Physics Letters

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“…Nanoconjugates consisting of nanocrystals coupled with graphene-based materials have recently attracted the interest of the scientific community for their synergistic properties originating from the coupling of the two different materials [1][2][3][4][5][6][7]. The functional groups (hydroxy, carbonyl, carboxy) on their basal planes or edges of the 2D materials-which make them soluble in multiple solvents, coupled with their low dimensionality-offer attractive properties for applications ranging from photovoltaics to photodetectors and sensors [8][9][10][11].…”

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confidence: 99%

Laser-Assisted Fabrication for Metal Halide Perovskite-2D Nanoconjugates: Control on the Nanocrystal Density and Morphology

et al. 2020

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We report on a facile and rapid photo-induced process to conjugate graphene-based materials with metal-halide perovskite nanocrystals. We show that a small number of laser pulses is sufficient to decorate the 2-dimensional (2D) flakes with metal-halide nanocrystals without affecting their primary morphology. At the same time, the density of anchored nanocrystals could be finely tuned by the number of irradiation pulses. This facile and rapid room temperature method provides unique opportunities for the design and development of perovskite-2D nanoconjugates, exhibiting synergetic functionality by combining nanocrystals of different morphologies and chemical phases with various 2D materials.

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“…This can be secured with the integration into the active layer of a third component [29][30][31][32]. This third element could be a polymer [32][33][34][35], an organic small molecule [36][37][38][39][40][41][42][43][44][45][46][47][48][49], a dye [50][51][52], a fullerene derivative [53], a graphene and a two dimensional (2D)-based material [54][55][56][57][58][59], or a nanocrystal [60]. The introduction and the availability of materials to be leveraged as third element support the better engineering of this architecture towards better photovoltaic OSCs' performances.…”

Section: Introductionmentioning

confidence: 99%

Benzothiadiazole Based Cascade Material to Boost the Performance of Inverted Ternary Organic Solar Cells

et al. 2020

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A conjugated, ladder-type multi-fused ring 4,7-dithienbenzothiadiazole:thiophene derivative, named as compound ‘T’, was for the first time incorporated, within the PTB7:PC71BM photoactive layer for inverted ternary organic solar cells (TOSCs) realization. The effective energy level offset caused by compound T between the polymeric donor and fullerene acceptor materials, as well as its resulting potential as electron cascade material contribute to an enhanced exciton dissociation, electron transfer facilitator and thus improved overall photovoltaic performance. The engineering optimization of the inverted TOSC, ITO/PFN/PTB7:Compound T(5% v/v):PC71BM/MoO3/Al, resulted in an overall power conversion efficiency (PCE) of 8.34%, with a short-circuit current density (Jsc) of 16.75 mA cm−2, open-circuit voltage (Voc) of 0.74 V and a fill factor (FF) of 68.1%, under AM1.5G illumination. This photovoltaic performance was improved by approximately 12% with respect to the control binary device.

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Laser induced nucleation of plasmonic nanoparticles on two-dimensional nanosheets for organic photovoltaics

Abstract: A novel top-down and universal optical technique for the effective decoration of two-dimensional (2D) nanosheets (NS), graphene oxide (GO), boron nitride (BN) and tungsten disulfide (WS2), with noble metallic nanoparticles (NPs) is reported.

Cited by 50 publications

References 58 publications

Room temperature observation of biexcitons in exfoliated WS2 monolayers

Room temperature observation of biexcitons in exfoliated WS2 monolayers

Laser-Assisted Fabrication for Metal Halide Perovskite-2D Nanoconjugates: Control on the Nanocrystal Density and Morphology

Benzothiadiazole Based Cascade Material to Boost the Performance of Inverted Ternary Organic Solar Cells

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