Dye Regeneration Kinetics of C343-Sensitized Nickel Oxide Investigated by Scanning Electrochemical Microscopy

Alemu, Anshebo Getachew

doi:10.4236/msa.2022.131002

Cited by 2 publications

(2 citation statements)

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“…Tis could be due to the fact that the NiO thickness allowed for greater perovskite loading than the PEDOT: PSS sample and bar FTO. Te loading concentration of CH 3 NH 3 PbI 3 on NiO sample (Γ D, NiO ) was signifcantly higher than Γ D, PDOT: PSS and Γ D, FTO ), with an estimated value of (Γ D, NiO � 1.304 ×10 2 ) × (Γ D, PDOT: PSS ), and (Γ D, NiO � 2.54 ×10 4 ) × (Γ D, FTO ) [46,62]. Furthermore, the absorption crosssection(ϕ hv ) of FTO/NiO/CH 3 NH 3 PbI 3 is 6.87 × 10 6 mol −1 cm 2 under blue light, while the absorption cross-section of FTO/PEDOT: PSS/CH 3 NH 3 PbI 3 is 4.15 × 10 5 mol −1 cm 2 under blue illumination.…”

Section: Resultsmentioning

confidence: 92%

“…It is noted that under blue illumination, the k ef of NiO/CH 3 NH 3 PbI 3 is slightly higher than the k ef of PEDOT: PSS/CH 3 NH 3 PbI 3 , but under red illumination, the k ef of NiO/CH 3 NH 3 PbI 3 is two times higher than the k ef of PEDOT: PSS/CH 3 NH 3 PbI 3 [36,50]. Tis implies that the signifcant impact layer on the registration kinetics rate was represented by loading concentration of CH [46,62]. Tese results agree with the light absorbance of both NiO/CH 3 NH 3 PbI 3 flm and PEDOT: PSS/CH 3 NH 3 PbI 3 flm, revealing the maximum photon absorption in the range of 350 nm to 800 nm in the visible region.…”

Section: Resultsmentioning

confidence: 94%

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Scanning Electrochemical Microscope Studies of Charge Transfer Kinetics at the Interface of the Perovskite/Hole Transport Layer

Anshebo

Gebreyohanes

Difer

et al. 2023

Journal of Nanotechnology

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Interfacial carrier transfer kinetics is critical to the efficiency and stability of perovskite solar cells. Herein, we measure the regeneration rate constant, absorption cross-section, reduction rate constant, and conductivity of hole transport layered perovskites using scanning electrochemical microscopy (SECM). The SECM feedback revealed that the regeneration rate constant, absorption cross-section, and reduction rate constant of the nickel oxide (NiO) layer perovskite layer are higher than those of the poly (3,4-ethyenedioxythiophene)-poly (styrenesulfonate) layered perovskite. Also, at a specific flux density ( J h v ), the value of the regeneration rate constant (keff) in both blue and red illuminations for the NiO/CH3NH3PbI3 film is significantly higher than in both PEDOT: PSS/CH3NH3PbI3 and FTO/CH3NH3PbI3 films. The difference in keff between layered and nonlayered perovskite conforms to the impact of the hole conducting layer on the charge transfer kinetics. According to the findings, SECM is a powerful approach for screening an appropriate hole transport layer for stable perovskite solar cells.

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Section: Resultsmentioning

confidence: 92%

Section: Resultsmentioning

confidence: 94%

Scanning Electrochemical Microscope Studies of Charge Transfer Kinetics at the Interface of the Perovskite/Hole Transport Layer

Anshebo

Gebreyohanes

Difer

et al. 2023

Journal of Nanotechnology

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Investigation on Dye Regeneration Kinetics at P‐Type Sensitized Nanoparticle Nickel Oxide Film by Scanning Electrochemical Microscopy

Anshebo

Gebreyohanes

2022

Journal of Nanomaterials

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The efficiency of a NiO-sensitized solar cell is determined by the kinetics of hole injection and dye regeneration reactions at the NiO/dye/electrolyte interface. In this research, the photochemical regeneration kinetics of dye adsorbed on the NiO film was investigated by scanning electrochemical microscopy (SECM). Besides, organic C343 and P1 sensitizers in combination with iodide-based, cobalt-based, and thiolate-based electrolytes were selected to understand the effect of sensitizers and redox shuttles on the dye regeneration process. As a result, a fast regeneration kinetic rate constant was conformed in the thiolate-based sample compared with cobalt-based and iodide-based, demonstrating that the organic redox shuttle was an efficient mediator to optimize the performance of p-type DSSC. Furthermore, the regeneration rate constants ( k eff ), reduction rate constants ( k red ), and absorption cross section ( Ф hv ) were investigated for organic dyes and electrolytes. That is, an effective dye regeneration rate constant k red of 6.95 × 10 5 mol-1cm3s-1 for NiO/P1 and k red of 3.75 × 10 5 mol-1cm3s-1 for NiO/C343 was found at various wavelengths. Therefore, the experimental results demonstrate that regeneration kinetics are dependent on the type of electrolyte and dye used. Moreover, the results suggest that scanning electrochemical microscopy is a powerful method for screening efficient dyes and electrolytes for charge transfer reactions in P-type dye-sensitized solar cells.

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Dye Regeneration Kinetics of C343-Sensitized Nickel Oxide Investigated by Scanning Electrochemical Microscopy

Cited by 2 publications

References 50 publications

Scanning Electrochemical Microscope Studies of Charge Transfer Kinetics at the Interface of the Perovskite/Hole Transport Layer

Scanning Electrochemical Microscope Studies of Charge Transfer Kinetics at the Interface of the Perovskite/Hole Transport Layer

Investigation on Dye Regeneration Kinetics at P‐Type Sensitized Nanoparticle Nickel Oxide Film by Scanning Electrochemical Microscopy

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