Enhanced Photocurrent in Rh-Substituted $\alpha$-Fe$_{2}$O$_{3}$ Thin Films Grown by Pulsed Laser Deposition

Seki, Munetoshi; Yamahara, Hiroyasu; Tabata, Hitoshi

doi:10.1143/apex.5.115801

Cited by 37 publications

(34 citation statements)

References 22 publications

(48 reference statements)

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“…With the same corundumtype crystal structure, α-Rh 2 O 3 has an ideal optical bandgap of ~1.2-1.4 eV [294] . The bandgap of α-Fe 2 O 3 is narrowed by Rh substitution in hematite which, in turn, increasing its optical activity [295] . Analogously, the Bi-Fe (doped with V) families of oxides are also investigated as potential solar light harvesters with a special focus in the composition Bi 4 V 1.5 Fe 0.5 O 10.5 [296] .…”

Section: Otf As the Core: Light Harvestersmentioning

confidence: 99%

Functional Oxides for Photoneuromorphic Engineering: Toward a Solar Brain

Pérez‐Tomás

2019

Adv Materials Inter

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New device concepts and new computing principles are needed to balance our ever-growing appetite for data and information with the realization of the goals of increased energy efficiency, reduction in CO 2 emissions and the circular economy. Neuromorphic or synaptic electronics is an emerging field of research aiming to overcome the current computer's Von-Neumann bottleneck by building artificial neuronal systems to mimic the extremely energy efficient biological synapses. The introduction of photovoltaic and/or photonic aspects into these neuromorphic architectures will produce self-powered adaptive electronics but may also open up new possibilities in artificial neuroscience, artificial neural communications, sensing and machine learning which would enable, in turn, a new era for computational systems owing to the possibility of attaining high bandwidths with much reduced power consumption. This perspective is focused on recent progress in the implementation of functional oxide thinfilms into photovoltaic and neuromorphic applications towards the envisioned goal of selfpowered photovoltaic neuromorphic systems or a solar brain.

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Section: Otf As the Core: Light Harvestersmentioning

confidence: 99%

Functional Oxides for Photoneuromorphic Engineering: Toward a Solar Brain

Pérez‐Tomás

2019

Adv Materials Inter

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“…Among the above listed strategies, additional efforts toward improving the charge collection efficiency consist of intentionally incorporating impurity atoms into the hematite lattice. There are numerous examples of enhanced water splitting activity upon introduction of high levels (0.5%–20% atomic) of impurities such as Si, Pt, Mn, Cr, Al, Ge, W, Rh and Ag [11,12,13,14,15,16,17,18,19]. Doping has been mostly achieved by sputtering [11], chemical deposition [20], pulsed laser deposition (PLD) [21] and hydrothermal methods [22], showing in all cases a significant photocurrent increase.…”

Section: Introductionmentioning

confidence: 99%

Photoelectrochemical Behavior of Electrophoretically Deposited Hematite Thin Films Modified with Ti(IV)

et al. 2016

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Doping hematite with different elements is a common strategy to improve the electrocatalytic activity towards the water oxidation reaction, although the exact effect of these external agents is not yet clearly understood. Using a feasible electrophoretic procedure, we prepared modified hematite films by introducing in the deposition solution Ti(IV) butoxide. Photoelectrochemical performances of all the modified electrodes were superior to the unmodified one, with a 4-fold increase in the photocurrent at 0.65 V vs. SCE in 0.1 M NaOH (pH 13.3) for the 5% Ti-modified electrode, which was the best performing electrode. Subsequent functionalization with an iron-based catalyst led, at the same potential, to a photocurrent of ca. 1.5 mA¨cm´2, one of the highest achieved with materials based on solution processing in the absence of precious elements. AFM, XPS, TEM and XANES analyses revealed the formation of different Ti(IV) oxide phases on the hematite surface, that can reduce surface state recombination and enhance hole injection through local surface field effects, as confirmed by electrochemical impedance analysis.

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“…Efforts have been made to improve the photo-response of hematite using suitable dopants to increase its conductivity and absorption coefficient and reduce the electron–holes recombination. The use of nano-sized particles or thin films to increase the diffusion length, mixing of hematite with other oxides like titanium dioxide, and the use of catalysts are some other strategies to improve the surface kinetics 28 , 29 . Doping of hematite has long been considered a means to improve the conductivity and water splitting activity of hematite.…”

Section: Introductionmentioning

confidence: 99%

Tuning the optoelectronic properties of hematite with rhodium doping for photoelectrochemical water splitting using density functional theory approach

Rauf

Adil

Mian

et al. 2021

Sci Rep

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Hematite (Fe2O3) is one of the best candidates for photoelectrochemical water splitting due to its abundance and suitable bandgap. However, its efficiency is mostly impeded due to the intrinsically low conductivity and poor light absorption. In this study, we targeted this intrinsic behavior to investigate the thermodynamic stability, photoconductivity and optical properties of rhodium doped hematite using density functional theory. The calculated formation energy of pristine and rhodium doped hematite was − 4.47 eV and − 5.34 eV respectively, suggesting that the doped material is thermodynamically more stable. The DFT results established that the bandgap of doped hematite narrowed down to the lower edge (1.61 eV) in the visible region which enhanced the optical absorption and photoconductivity of the material. Moreover, doped hematite has the ability to absorb a broad spectrum (250–800) nm. The enhanced optical absorption boosted the photocurrent and incident photon to current efficiency. The calculated results also showed that the incorporation of rhodium in hematite induced a redshift in optical properties.

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Enhanced Photocurrent in Rh-Substituted $\alpha$-Fe$_{2}$O$_{3}$ Thin Films Grown by Pulsed Laser Deposition

Cited by 37 publications

References 22 publications

Functional Oxides for Photoneuromorphic Engineering: Toward a Solar Brain

Functional Oxides for Photoneuromorphic Engineering: Toward a Solar Brain

Photoelectrochemical Behavior of Electrophoretically Deposited Hematite Thin Films Modified with Ti(IV)

Tuning the optoelectronic properties of hematite with rhodium doping for photoelectrochemical water splitting using density functional theory approach

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