Towards amorphous solution-processed small-molecule photovoltaic cells by design

Adhikari, Tham; Nunzi, Jean‐Michel; Lebel, Olivier

doi:10.1016/j.orgel.2017.07.001

Cited by 10 publications

(3 citation statements)

References 59 publications

(62 reference statements)

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“…Thus, it can be predicted that by enhancing electron-accepting ability of entire molecule, superior V oc could be attained when the small molecule is used as the donor materials. Small molecule donors were developed by Adhikari et al to replace the usual polymer donors used in solvent processed solar cells, like the molecular glasses 22 or the T-Shaped Indan-1,3-dione derivatives 23 .…”

Section: Introductionmentioning

confidence: 99%

Exploration of promising optical and electronic properties of (non-polymer) small donor molecules for organic solar cells

Khalid

Khan

Ahmed

et al. 2021

Sci Rep

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Non-fullerene based organic compounds are considered promising materials for the fabrication of modern photovoltaic materials. Non-fullerene-based organic solar cells comprise of good photochemical and thermal stability along with longer device lifetimes as compared to fullerene-based compounds. Five new non-fullerene donor molecules were designed keeping in view the excellent donor properties of 3-bis(4-(2-ethylhexyl)-thiophen-2-yl)-5,7-bis(2ethylhexyl) benzo[1,2-:4,5-c′]-dithiophene-4,8-dione thiophene-alkoxy benzene-thiophene indenedione (BDD-IN) by end-capped modifications. Photovoltaic and electronic characteristics of studied molecules were determined by employing density functional theory (DFT) and time dependent density functional theory (TD-DFT). Subsequently, obtained results were compared with the reference molecule BDD-IN. The designed molecules presented lower energy difference (ΔΕ) in the range of 2.17–2.39 eV in comparison to BDD-IN (= 2.72 eV). Moreover, insight from the frontier molecular orbital (FMO) analysis disclosed that central acceptors are responsible for the charge transformation. The designed molecules were found with higher λmax values and lower transition energies than BDD-IN molecule due to stronger end-capped acceptors. Open circuit voltage (Voc) was observed in the higher range (1.54–1.78 V) in accordance with HOMOdonor–LUMOPC61BM by designed compounds when compared with BDD-IN (1.28 V). Similarly, lower reorganization energy values were exhibited by the designed compounds in the range of λe(0.00285–0.00370 Eh) and λh(0.00847–0.00802 Eh) than BDD-IN [λe(0.00700 Eh) and λh(0.00889 Eh)]. These measurements show that the designed compounds are promising candidates for incorporation into solar cell devices, which would benefit from better hole and electron mobility.

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Section: Introductionmentioning

confidence: 99%

Exploration of promising optical and electronic properties of (non-polymer) small donor molecules for organic solar cells

Khalid

Khan

Ahmed

et al. 2021

Sci Rep

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“…24) Third, derivatives with reactive functional groups can be synthesized in relatively high yields and at low costs, 25) which allows one to use them as common building blocks to introduce various chromophores, 26,27) ligands, 28) or electron donors or acceptors. 29,30) Mexylaminotriazines can thus potentially easily be functionalized with a triphenylamine group to combine the HTM properties of triphenylamine itself 31,32) with the glassforming properties of the mexylaminotriazine group. Recently, we reported series of molecular glass as HTMs with the different electron donor units triphenylamine (TPA) and dimethoxydiphenylamine (OMe-DPA).…”

Section: Introductionmentioning

confidence: 99%

Low-cost molecular glass hole transport material for perovskite solar cells

Wang¹,

Shahiduzzaman²,

Fukaya³

et al. 2021

Jpn. J. Appl. Phys.

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The availability of low-cost hole transport materials (HTMs) that are easy to process is crucial for the eventual commercialization of perovskite solar cells (PSCs), as the commonly used HTM (Spiro-OmeTAD) is expensive, and its processing is complex. In this study, we synthesized an amorphous molecular material (termed as TPA-glass) from the condensation of 2-mexylamino-4-methylamino-6-(4-aminophenylamino)-1,3,5-triazine and N-(4-formylphenyl)diphenylamine with a low-cost and easy process, and applied as an HTM in PSCs. We investigated the effect of TPA-glass thin-films with varying thickness, as well as their corresponding solar cell’s properties. The preliminary performance data indicate that TPA-glass thin-film can be a potential HTM candidate for planar PSCs.

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“…While studying glass formation in mexylaminotriazine derivatives, the fact that one of the arylamino groups could be substituted for various aryl‐ or alkylamino substituents while retaining glass‐forming ability gave rise to the idea of a modular strategy to use these glass‐forming compounds to induce glass formation in various chromophores through a simple covalent bond linkage . Indeed, molecular glasses containing various reactive functional groups, including thiol 4 , amines 5 – 6 , and rhodanine 7 , could be readily designed and synthesized, then reacted with dyes (Scheme ) …”

Section: Introductionmentioning

confidence: 99%

Revisiting the Optimal Nano‐Morphology: Towards Amorphous Organic Photovoltaics

Nunzi

Lebel

2018

The Chemical Record

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Organic photovoltaic cells commonly use an active layer with a polycrystalline bulk heterojunction. However, for simplifying the fabrication process, it may be worthwhile to use an amorphous active layer to lessen the burden on processing to achieve optimal performance. While polymers can adopt amorphous phases, molecular glasses, small molecules that can readily form glassy phases and do not crystallize over time, offer an appealing alternative, being monodisperse species. Our group has developed a series of reactive molecular glasses that can be covalently bonded to chromophores to form glass‐forming adducts, and this strategy has been used to synthesize glass‐forming donor and acceptor materials. Herein, the results of devices incorporating these materials in either partially or fully amorphous active layers are summarized. Additionally, these molecular glasses can be used as ternary components in crystalline systems to enhance efficiency without perturbing the morphology.

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Towards amorphous solution-processed small-molecule photovoltaic cells by design

Cited by 10 publications

References 59 publications

Exploration of promising optical and electronic properties of (non-polymer) small donor molecules for organic solar cells

Exploration of promising optical and electronic properties of (non-polymer) small donor molecules for organic solar cells

Low-cost molecular glass hole transport material for perovskite solar cells

Revisiting the Optimal Nano‐Morphology: Towards Amorphous Organic Photovoltaics

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