A carbon-doped tantalum dioxyfluoride as a superior electron transport material for high performance organic optoelectronics

Vasilopoulou, Maria; Yusoff, Abd. Rashid bin Mohd; Kuganathan, Navaratnarajah; Bao, Xichang; Verykios, Apostolis; Polydorou, Ermioni; Armadorou, Konstantina‐Kalliopi; Soultati, Anastasia; Papadimitropoulos, G.; Haider, Muhammad Zulqurnain; Fakharuddin, Azhar; Palilis, Leonidas C.; Κέννου, Στέλλα; Chroneos, Alexander; Argitis, Panagiotis; Davazoglou, Dimitris

doi:10.1016/j.nanoen.2020.104508

Cited by 8 publications

(2 citation statements)

References 61 publications

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“…However, for lm NB, the peak for Ta-4f 7/2 is shifted to high energies and appears at 29.21 eV. This shift may be attributed to high uorine anion activity indicating a uorinated oxide phase of tantalum (O-Ta-F) [48].…”

Section: X-ray Photoelectron Spectroscopy Analysismentioning

confidence: 98%

Fabrication of tantalum oxyfluoride and oxynitride thin films via ammonolysis of sol–gel processed tetraethoxo (β-diketonato) tantalum (V) precursors for enhanced photocatalytic activity

Danish

Pandey

Khan

et al. 2021

J Mater Sci: Mater Electron

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In the present report, the generation of Tantalum oxy uoride and oxynitride upon ammonolysis of the gel obtained from modi ed tantalum-alkoxo complexes is reported. To the best of our knowledge, this is rst report of the formation of tantalum oxy uoride thin lms via ammonolysis of the β-diketone modi ed tantalum-alkoxo complex [Ta(OEt) 4 (CF 3 COCH 2 COCH 3 )] m . The integration of nitrogen and uorine in lattice sites of metal oxides leads to signi cant reduction in the band gap, resulting in their activation under visible light. Moreover, in this report the effect of the modi ed alkoxide precursors and ammonolysis on the photo-physical properties of Ta 2 O 5 thin lms have also been investigated and compared with the results obtained from lms fabricated from unmodi ed tantalum (V) ethoxide. 1 H NMR, 13 C NMR and elemental analyses con rmed successful modi cation of tantalum (V) ethoxide to [Ta(OCH 2 CH 3 ) 4 (CH 3 COCHClCOCH 3 )] m (1), [Ta(OCH 2 CH 3 ) 4 (CF 3 COCH 2 COCH 3 ] m (2) and [Ta(OCH 2 CH 3 ) 4 (CH 3 COC(CH 3 ) 2 COCH 3 ))] m (3). The fabrication of Ta 2 O 5 thin lms involved the spin casting of the gels of modi ed tantalum alkoxo complexes (processed by sol-gel method) on to glass substrate. X-ray photoelectron spectroscopy results show that nitrogen was incorporated into the ammonolyzed lms fabricated from complex precursors (1) and ( 3), while the presence of uorine as tantalum oxy uoride was con rmed in the ammonolyzed lm fabricated from complex (2) precursor. The optical characterization insinuate band gap narrowing from 3.55 eV for undoped lm prepared from tantalum (V) ethoxide to 3.47 eV for undoped lm prepared from [Ta(OEt) 4 (CF 3 COCH 2 COCH 3 )] m and 3.05 eV for ammonolyzed lm obtained from [Ta(OEt) 4 (CF 3 COCH 2 COCH 3 )] m precursor. Furthermore, enhanced photocatalytic e ciency of the lms is demonstrated by degradation of methylene blue dye.

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Section: X-ray Photoelectron Spectroscopy Analysismentioning

confidence: 98%

Fabrication of tantalum oxyfluoride and oxynitride thin films via ammonolysis of sol–gel processed tetraethoxo (β-diketonato) tantalum (V) precursors for enhanced photocatalytic activity

Danish

Pandey

Khan

et al. 2021

J Mater Sci: Mater Electron

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“…The most prominent explored strategy today is using novel and carefully designed materials. Materials such as organic molecules and conductive polymers, , fluorides, hybrid oxide-organic materials, and graphene and graphene oxide derivatives, among others, have been incorporated at the organic contacts to enhance the device performance and stability. These research trends increase the need to optimize interfaces for maximum device efficiency.…”

Section: Introductionmentioning

confidence: 99%

Role of the Interface and Extraction Layer Energetics in Organic Solar Cells

2021

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Interface engineering plays an important role in performance improvement for bulk-heterojunction organic solar cells (OSCs). The charge carrier dynamics and energetic landscape at the donor:acceptor (D:A) interface can strongly differ from the bulk of the active layer. This is particularly crucial for the device performance when the interface is strongly disordered or nanostructured. In this work, we present a kinetic Monte Carlo (kMC) study to clarify the role of the disorder at the D:A interface and the interface between the photoactive layer and the extraction layer on the performance of bulk-heterojunction OSCs. We parametrize the material parameters for a moderately efficient OSC. Our results demonstrate that the disorder at the D:A interface especially tailors the photocurrent and fill factor, while the disorder at the extraction layer mainly controls the open-circuit voltage. The D:A interface plays the dominant role in device performance and needs to be controlled to achieve efficient OSCs. Furthermore, we show that losses due to the interface disorder can be partially restored in the presence of energy cascades by mixed phases within the interface region.

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Inorganic and Hybrid Interfacial Materials for Organic and Perovskite Solar Cells

Palilis

Vasilopoulou

Verykios

et al. 2020

Advanced Energy Materials

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As organic solar cells (OSCs) and perovskite solar cells (PVSCs) move closer to commercialization, further efforts toward optimizing both cell efficiency and stability are needed. As interfaces strongly affect device performance and degradation processes, interfacial engineering by employing various materials as hole transport layers (HTLs) and electron transport layers (ETLs) has been a very active field of research in OSCs and PVSCs. Among them, inorganic materials exhibit significant advantages in promoting device performance due to their excellent charge transporting properties and intrinsic thermal and chemical robustness. In this review, an extensive overview is provided of inorganic semiconductors such as copper‐based ones with emphasis on copper iodide and copper thiocyanate, transition metal chalcogenides, nitrides and carbides as well as hybrid materials based on these inorganic compounds that have been recently employed as HTLs and ETLs in OSCs and PVSCs. Following a short discussion of the main optoelectronic and physical properties that interfacial materials used as HTLs and ETLs should possess, the functionalities of the aforementioned materials as interfacial, charge transport, layers in OSCs and PVSCs are discussed in depth. It is concluded by providing guidelines for further developments that could significantly extend the implementation of these materials in solar cells.

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A carbon-doped tantalum dioxyfluoride as a superior electron transport material for high performance organic optoelectronics

Cited by 8 publications

References 61 publications

Fabrication of tantalum oxyfluoride and oxynitride thin films via ammonolysis of sol–gel processed tetraethoxo (β-diketonato) tantalum (V) precursors for enhanced photocatalytic activity

Fabrication of tantalum oxyfluoride and oxynitride thin films via ammonolysis of sol–gel processed tetraethoxo (β-diketonato) tantalum (V) precursors for enhanced photocatalytic activity

Role of the Interface and Extraction Layer Energetics in Organic Solar Cells

Inorganic and Hybrid Interfacial Materials for Organic and Perovskite Solar Cells

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