Ni Mg Mixed Metal Oxides for p-Type Dye-Sensitized Solar Cells

Zannotti, Marco; Wood, Christopher J.; Summers, Gareth H.; Stevens, Lee A.; Hall, Matthew; Snape, Colin E.; Giovannetti, Rita; Gibson, Elizabeth A.

doi:10.1021/acsami.5b06170

Cited by 32 publications

(20 citation statements)

References 25 publications

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“…The device based on hierarchical NiO/CMK-3 shows a higher J sc (5.25 mA cm -2 ) than that based on NiO clusters (2.86 mA cm -2 ). The higher J sc of the NiO/CMK-3 can be explained by the high specific surface area of the nanocomposite (508 m 2 g -1 ), which is far higher than that previously reported [9,19,20,[35][36][37]. CMK-3 has a high specific surface of 1091 m 2 g -1 , and in the hierarchical structure acts as a template that effectively prevents the self-aggregation of NiO.…”

Section: Discussionmentioning

confidence: 68%

Hierarchical NiO/CMK-3 Photocathode for a p-Type Dye-Sensitized Solar Cell with Improved Photoelectrochemical Performance and Fast Hole Transfer

Fan

Mira

et al. 2020

Molecules

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The sluggish photoelectrochemical performance of p-type dye-sensitized solar cells (p-DSSCs) has hindered its commercial use. In this work, we introduce a novel hierarchical nanocomposite of NiO nanoparticles anchored on highly ordered mesoporous carbons CMK-3 (NiO/CMK-3). Using CMK-3 as a backbone effectively prevented the self-aggregation of NiO nanoparticles and subsequently increased the total specific surface area of the composite for more dye adsorption. The interconnected conductive networks of CMK-3 also served as a split-flow high-speed channel, which was beneficial for hole spin-flow to accelerate hole transfer. The hierarchical NiO/CMK-3 photocathode improved the photovoltaic conversion efficiency to 1.48% in a cell with a Cobalt(II)/(III) electrolyte and a PMI-6T-TPA dye.

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Section: Discussionmentioning

confidence: 68%

Hierarchical NiO/CMK-3 Photocathode for a p-Type Dye-Sensitized Solar Cell with Improved Photoelectrochemical Performance and Fast Hole Transfer

Fan

Mira

et al. 2020

Molecules

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“…The shifting of Fermi energy due to the carrier concentration thereby explain the drop in flat‐band potential for sample with Al content >25 mol%. The increase in CBM energy might affect the electron injection rate from the excited dye to the photoanode . The results showed that the V OC of the DSSCs is directly affected by the flat‐band potential, indicating that the drag of injection rate is negligible with CBM playing the most crucial part in V OC determination.…”

Section: Resultsmentioning

confidence: 98%

Photocurrents in crystal‐amorphous hybrid stannous oxide/alumina binary nanofibers

et al. 2019

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Suppression of charge recombination by thin amorphous alumina layers on metal oxide semiconductors has demonstrated a vital role in electronic appliances beside its role as an insulator. This study reports effect of amorphous alumina (Al2O3) on the structural, electrical, and optical properties of stannous oxide (SnO2). The samples for the present study are prepared as nanofibers by electrospinning a polymeric solution containing aluminum and stannous precursors and subsequent annealing; six samples with varying concentrations of aluminum and stannous are considered. A crystal‐amorphous SnO2/Al2O3 hybrid system was confirmed by both XRD and XPS analysis. Both BET and Mott‐Schottky analysis showed increase in the surface area and conduction band minimum of the sample with increase in the Al content, however, at the expense of its electrical conductivity. The electron lifetime of the sample increased with increase in the Al content, but the electron transport time increase with decrease in the electrical conductivity of the sample. Both Urbach energy measurement and Stoke's shift showed generation of deeper trap state with increase in the Al content. Investigation on sample photovoltaic performance showed that the loss in electrical conductivity of the sample can be compensated by the improved surface area to a certain extent. Interestingly, a composite nanofiber containing equal molar fraction of aluminum and stannous showed orders of magnitude higher photocurrent despite its similar resistivity as that of pure alumina fibers, which is shown to originate from a Fermi energy gradient at the Al2O3/SnO2 interface.

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“…Photoelectron spectra contain a wealth of qualitative and quantitative information, but in some circumstances, can be extremely complex with the spectra of lanthanides prime examples 58 . Such complexity poses real challenges to even the most experienced analysts and one must always be on guard against commonly encountered errors such as incorrectly attributing peak asymmetry, satellite structure, multiplet splitting or screened photoemission peaks to non-stoichiometric or high oxidation states (see for example [59][60][61][62][63][64][65][66] ). An excellent paper on the use and misuse of curve fitting is given by Sherwood 67 , and we highlight some of the points raised in that paper in the following sections.…”

Section: Spectral Interpretationmentioning

confidence: 99%

Practical guide for x-ray photoelectron spectroscopy: Applications to the study of catalysts

Davies

Morgan

2020

Journal of Vacuum Science &Amp; Technology A: Vacuum, Surfaces, and Films

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X-ray photoelectron spectroscopy (XPS) has become a standard tool for the study of catalytic materials over the last two decades and with the increasing popularity of turnkey XPS systems, the analysis of these types of materials is open to an even wider audience. However, increased accessibility leads to an increase in the number of new or inexperienced practitioners, leading to erroneous data collection and interpretation. Over many years of working on a wide range of catalytic materials, we have developed procedures for the planning and execution of XPS analysis and subsequent data analysis, and this guide has been produced to help users of all levels of expertise to question their approach towards analysis and get the most out of the technique and avoiding some common pitfalls.

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Ni Mg Mixed Metal Oxides for p-Type Dye-Sensitized Solar Cells

Cited by 32 publications

References 25 publications

Hierarchical NiO/CMK-3 Photocathode for a p-Type Dye-Sensitized Solar Cell with Improved Photoelectrochemical Performance and Fast Hole Transfer

Hierarchical NiO/CMK-3 Photocathode for a p-Type Dye-Sensitized Solar Cell with Improved Photoelectrochemical Performance and Fast Hole Transfer

Photocurrents in crystal‐amorphous hybrid stannous oxide/alumina binary nanofibers

Practical guide for x-ray photoelectron spectroscopy: Applications to the study of catalysts

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