Regulating optoelectronics of carbon dots with redox-active dopamine

Panigrahi, Aradhana; Behera, Ranjan Kumar; Mishra, Leepsa; Dubey, Priyanka; Dutta, Soumi; Sarangi, Manas Kumar

doi:10.1016/j.talo.2023.100198

Cited by 7 publications

(3 citation statements)

References 62 publications

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“…68 It is observed that the FN tunneling in PNC is curtailed after the addition of C 60 , revealing only direct tunneling for PNC-C 60 (exponential growth only). We have estimated the transition voltage (V t ), 69 at which the tunneling switches from direct to FN type at the inflection point, and it is found to be 0.34 V for PNC and 0.25 V for PNC-C 60 (depicting direct tunneling only). This infers that the addition of C 60 increases the current through the AFM tip-(PNC-C 60 )-HOPG nanojunction by facilitating conduction toward the electrode.…”

Section: Resultsmentioning

confidence: 99%

Insight into the Importance of Charge Transfer Dynamics in CsPbBr₃ Perovskite Nanocrystals for Photovoltaic Applications

Dubey,

Mishra,

Panigrahi

et al. 2024

J. Phys. Chem. C

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Charge transfer (CT) kinetics at the interfaces of lead-halide-based perovskite nanocrystals (PNCs) are pivotal in dictating the efficacies of energy conversion. Our investigation delves into the intricacies of CT between cesium lead bromide (CsPbBr 3 )-based PNCs and fullerene (C 60 ) employing a suite of spectroscopic and theoretical investigations. Notably, we discern a facile interfacial photoinduced electron transfer (ET) from CsPbBr 3 PNCs to C 60 , in good agreement with their respective aligned energy levels. Complementary current sensing atomic force microscopy measurements unveil a substantial enhancement in conductivity across the electrode−PNC−electrode nanojunction in the presence of C 60 . To establish the implications of such ET in photovoltaic devices, we have simulated the performance of two devices: one without C 60 and one with C 60 . We unfold an impressive increment in the power conversion efficiency from 12.5% to 15.8% in FTO/CsPbBr 3 /PEDOT:PSS/Au configurations upon integrating a band-aligned C 60 layer. These outcomes accentuate the relevance of regulated interlayer CT in optimizing photovoltaic device performance.

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Section: Resultsmentioning

confidence: 99%

Insight into the Importance of Charge Transfer Dynamics in CsPbBr₃ Perovskite Nanocrystals for Photovoltaic Applications

Dubey,

Mishra,

Panigrahi

et al. 2024

J. Phys. Chem. C

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Section: Photostability Testsmentioning

confidence: 91%

“…two major contributions can be identified, at 566 nm and 625 nm, which can be associated with the formerly mentioned species. They suffered bathochromic shifts of 82 and 62 nm, respectively, proving the tunable photoluminescence properties of N-CDs [45][46][47]. The QY and fluorescence lifetime were also measured for both N-CDs, resulting in QYs of 2.3% when the synthesis lasted 2 h and 6.2% when it was left for 4 h. Fluorescence lifetimes of 2.59 ns for N-CDs and 3.04 ns for N-CDs were also observed when the reaction time was set at 2 h and when the reaction was maintained for 4 h.…”

Section: Optical Properties Of the Cdsmentioning

confidence: 92%

One-Pot Synthesis of Green-Emitting Nitrogen-Doped Carbon Dots from Xylose

Rodríguez-Carballo,

García-Sancho,

Algarra

et al. 2023

Catalysts

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Carbon dots (CDs) are interesting carbon nanomaterials that exhibit great photoluminescent features, low cytotoxicity, and excellent water stability and solubility. For these reasons, many fields are starting to integrate their use for a variety of purposes. The catalytic performance of VOPO4 has been evaluated in the synthesis of nitrogen-doped carbon dots (N-CDs). The synthesis reaction was carried out at 180 °C using VOPO4 as a heterogeneous catalyst for 2 to 4 h of reaction time. After reaction, the N-CDs were purified using a novel method for the protection of the functional groups over the surfaces of the N-CDs. The morphological, superficial, and photoelectronic properties of the N-CDs were thoroughly studied by means of TEM, HRTEM, XPS, and photoluminescence measurements. The conversion of the carbon precursor was followed by HPLC. After three catalytic runs, the catalyst was still active while ensuring the quality of the N-CDs obtained. After the third cycle, the catalyst was regenerated, and it recovered its full activity. The obtained N-CDs showed a great degree of oxidized groups in their surfaces that translated into high photoluminescence when irradiated under different lasers. Due to the observed photoelectronic properties, they were then assayed in the photocatalytic degradation of methyl orange.

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Formation of homogeneous pyridinic emission states in carbon dots via solid-state carbonization of aminoquinoline: Optical design principles and light-emitting diode applications

Byun,

Lee,

Bae

et al. 2024

Journal of Alloys and Compounds

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Regulating optoelectronics of carbon dots with redox-active dopamine

Cited by 7 publications

References 62 publications

Insight into the Importance of Charge Transfer Dynamics in CsPbBr₃ Perovskite Nanocrystals for Photovoltaic Applications

Insight into the Importance of Charge Transfer Dynamics in CsPbBr₃ Perovskite Nanocrystals for Photovoltaic Applications

One-Pot Synthesis of Green-Emitting Nitrogen-Doped Carbon Dots from Xylose

Formation of homogeneous pyridinic emission states in carbon dots via solid-state carbonization of aminoquinoline: Optical design principles and light-emitting diode applications

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Regulating optoelectronics of carbon dots with redox-active dopamine

Cited by 7 publications

References 62 publications

Insight into the Importance of Charge Transfer Dynamics in CsPbBr3 Perovskite Nanocrystals for Photovoltaic Applications

Insight into the Importance of Charge Transfer Dynamics in CsPbBr3 Perovskite Nanocrystals for Photovoltaic Applications

One-Pot Synthesis of Green-Emitting Nitrogen-Doped Carbon Dots from Xylose

Formation of homogeneous pyridinic emission states in carbon dots via solid-state carbonization of aminoquinoline: Optical design principles and light-emitting diode applications

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Insight into the Importance of Charge Transfer Dynamics in CsPbBr₃ Perovskite Nanocrystals for Photovoltaic Applications

Insight into the Importance of Charge Transfer Dynamics in CsPbBr₃ Perovskite Nanocrystals for Photovoltaic Applications