Photoactive Donor–Acceptor Composite Nanoparticles Dispersed in Water

Parrenin, Laurie; Laurans, Gildas; Pavlopoulou, Eleni; Fleury, Guillaume; Pécastaings, Gilles; Brochon, Cyril; Vignau, Laurence; Hadziioannou, Georges; Cloutet, Éric

doi:10.1021/acs.langmuir.6b04496

Cited by 17 publications

(41 citation statements)

References 51 publications

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“…Nanoparticles of PCDTBT blended with ([6,6]-phenyl-C 71 -butyric acid methyl ester) (PC 71 BM) have been demonstrated in bulk-heterojunction photovoltaic devices (D'Olieslaeger et al, 2017; Prunet et al, 2018). Different methods are available to create such particles, including the preparation of a miniemulsion comprising PC 71 BM, PCDTBT, and a surfactant in an appropriate solvent (D'Olieslaeger et al, 2017; Parrenin et al, 2017) or by first dissolving the components (PCDTBT and PC 61 BM or PC 71 BM) in a good solvent (tetrahydrofuran, THF) which is then dispersed in an excess of a non-solvent, water (Wang et al, 2016; Prunet et al, 2018). After the THF has been allowed to evaporate, a nanoparticle dispersion remains.…”

Section: Introductionmentioning

confidence: 99%

Size-Dependent Photophysical Behavior of Low Bandgap Semiconducting Polymer Particles

et al. 2019

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The photophysics of water and propan-1-ol suspensions of poly [N-9”-heptadecanyl-2,7-carbazole- alt −5,5-(4,7-di-2-thienyl-2′,1′,3′- benzothiadiazole)] (PCDTBT) nanoparticles and mesoparticles has been studied by ultrafast spectroscopy. High molar mass polymer (HMM > 20 kg/mol) forms nanoparticles with around 50 nm diameter via mini-emulsion post-polymerization, while low molar mass (LMM < 5 kg/mol) polymer prepared by dispersion polymerization results in particles with a diameter of almost one order of magnitude larger (450 ± 50 nm). In this study, the presence of excited-states and charge separated species was identified through UV pump and visible/near-infrared probe femtosecond transient absorption spectroscopy. A different behavior for the HMM nanoparticles has been identified compared to the LMM mesoparticles. The nanoparticles exhibit typical features of an energetically disordered conjugated polymer with a broad density of states, allowing for delayed spectral relaxation of excited states, while the mesoparticles show a J-aggregate-like behavior where interchain interactions are less efficient. Stimulated emission in the red-near infrared region has been found in the mesoparticles which indicates that they present a more energetically ordered system.

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Section: Introductionmentioning

confidence: 99%

Size-Dependent Photophysical Behavior of Low Bandgap Semiconducting Polymer Particles

et al. 2019

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“…[18][19][20] OPVs with active layers processed from a water or alcohol based nanoparticle dispersion has been reported in recent years. [21][22][23][24] These nanoparticles are processed from donor-acceptor blends either through a miniemulsion process with the presence of surfactant [25][26][27][28] or a precipitation method [21][22][23]29 . Furthermore, conjugated polymer nanoparticles were also reported to be synthesized by direct Suzuki-Miyaura dispersion polymerization.…”

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confidence: 99%

Environmentally friendly preparation of nanoparticles for organic photovoltaics

Pan

Sharma

Gedefaw

et al. 2018

Organic Electronics

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Aqueous nanoparticle dispersions were prepared from a conjugated polymer poly(2,5-thiophene-alt-4,9-bis(2-hexyldecyl)-4,9-dihydrodithieno[3,2-c:3',2'-h][1,5]naphthyridine-5,10-dione) (PTNT) and fullerene blend utilizing chloroform as well as a non-chlorinated and environmentally benign solvent, o-xylene, as the miniemulsion dispersed phase solvent. The nanoparticles (NPs) in the solid-state film were found to coalesce and offered a smooth surface topography upon thermal annealing. Organic photovoltaics (OPVs) with photoactive layer processed from the nanoparticle dispersions prepared using chloroform as the miniemulsion dispersed phase solvent were found to have a power conversion efficiency M A N U S C R I P T A C C E P T E D ACCEPTED MANUSCRIPT2 (PCE) of 1.04%, which increased to 1.65% for devices utilizing NPs prepared from o-xylene.Physical, thermal and optical properties of NPs prepared using both chloroform and o-xylene were systematically studied using dynamic mechanical thermal analysis (DMTA) and photoluminescence (PL) spectroscopy and correlated to their photovoltaic properties. The PL results indicate different morphology of NPs in the solid state were achieved by varying miniemulsion dispersed phase solvent.

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“…The important parameters when upscaling can be summarized into three areas; size of nanoparticles [ 20 ], free SDS concentration [ 21 ], and internal morphology of nanoparticles [ 22 ] (herein evaluated by solar cell performance).…”

Section: Resultsmentioning

confidence: 99%

Optimisation of purification techniques for the preparation of large-volume aqueous solar nanoparticle inks for organic photovoltaics

Almyahi¹,

Andersen²,

Cooling³

et al. 2018

Beilstein J. Nanotechnol.

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In this study we have optimised the preparation conditions for large-volume nanoparticle inks, based on poly(3-hexylthiophene) (P3HT):indene-C60 multiadducts (ICxA), through two purification processes: centrifugal and crossflow ultrafiltration. The impact of purification is twofold: firstly, removal of excess sodium dodecyl sulfate (SDS) surfactant from the ink and, secondly, concentration of the photoactive components in the ink. The removal of SDS was studied in detail both by a UV–vis spectroscopy-based method and by surface tension measurements of the nanoparticle ink filtrate; revealing that centrifugal ultrafiltration removed SDS at a higher rate than crossflow ultrafiltration even though a similar filter was applied in both cases (10,000 Da M w cut-off). The influence of SDS concentration on the aqueous solar nanoparticle (ASNP) inks was investigated by monitoring the surface morphology/topography of the ASNP films using atomic force microscopy (AFM) and scanning electron microscopy (SEM) and photovoltaic device performance as a function of ultrafiltration (decreasing SDS content). The surface morphology/topography showed, as expected, a decreased number of SDS crystallites on the surface of the ASNP film with increased ultrafiltration steps. The device performance revealed distinct peaks in efficiency with ultrafiltration: centrifuge purified inks reached a maximum efficiency at a dilution factor of 7.8 × 104, while crossflow purified inks did not reach a maximum efficiency until a dilution factor of 6.1 × 109. This difference was ascribed to the different wetting properties of the prepared inks and was further corroborated by surface tension measurements of the ASNP inks which revealed that the peak efficiencies for both methods occurred for similar surface tension values of 48.1 and 48.8 mN m−1. This work demonstrates that addressing the surface tension of large-volume ASNP inks is key to the reproducible fabrication of nanoparticle photovoltaic devices.

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Photoactive Donor–Acceptor Composite Nanoparticles Dispersed in Water

Cited by 17 publications

References 51 publications

Size-Dependent Photophysical Behavior of Low Bandgap Semiconducting Polymer Particles

Size-Dependent Photophysical Behavior of Low Bandgap Semiconducting Polymer Particles

Environmentally friendly preparation of nanoparticles for organic photovoltaics

Optimisation of purification techniques for the preparation of large-volume aqueous solar nanoparticle inks for organic photovoltaics

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