Solid–liquid-type solar cell based on α-Fe<sub>2</sub>O<sub>3</sub>heterostructures for solar energy harvesting

Seki, Munetoshi; Takahashi, Motomitsu; Ohshima, Toshiyuki; Yamahara, Hiroyasu; Tabata, Hitoshi

doi:10.7567/jjap.53.05fa07

Cited by 18 publications

(16 citation statements)

References 44 publications

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“…9 . Figures 9 a,b demonstrate that photocurrent and IPCE have been enhanced with doping in (250–800) nm in accordance with our absorption spectra for rhodium doped hematite and compatible with experiments 28 , 56 . In optically active materials, absorption and scattering of light significantly depend on the refractive index and extinction coefficient.…”

Section: Resultssupporting

confidence: 89%

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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Section: Resultssupporting

confidence: 89%

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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“…220) For Ga 2 O 3 , detailed understandings of the growth processes 221,222) and Al 2 O 3 /Ga 2 O 3 interface properties 223) have been progressed. Novel use of wide-bandgap oxides such as -Fe 2 O 3 for solar calls 224) and -(GaFe) 2 O 3 for spintronic applications 225) was demonstrated. Together with the development of alloy semiconductors 226) , oxide semiconductors may open new application fields not limited to power devices.…”

Section: Final Remarksmentioning

confidence: 99%

Wide-bandgap semiconductor materials: For their full bloom

Fujita

2015

Jpn. J. Appl. Phys.

299

151

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Wide-bandgap semiconductors are expected to be applied to solid-state lighting and power devices, supporting a future energy-saving society. While GaN-based white LEDs have rapidly become widespread in the lighting industry, SiC-and GaN-based power devices have not yet achieved their popular use, like GaN-based white LEDs for lighting, despite having reached the practical phase.What are the issues to be addressed for such power devices? In addition, other wide-bandgap semiconductors such as diamond and oxides are attracting focusing interest due to their promising functions especially for power-device applications. There, however, should be many unknown phenomena and problems in their defect, surface, and interface properties, which must be addressed to fully exploit their functions. In this review, issues of wide-bandgap semiconductors to be addressed in their basic properties are examined toward their "full bloom".

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“…(110) oriented hematite has been grown epitaxially and shown to possess improved photoelectrochemical performance as compared to polycrystalline films. 16 Very recently, Mashiko et al reported significantly improved onset potential for epitaxial undoped c-axis (001) hematite films as compared to m-axis (100) films. 17 Despite these findings, it is still unclear how orientation affects the photoelectrochemical properties of hematite photoanodes.…”

mentioning

confidence: 99%

Effect of Orientation on Bulk and Surface Properties of Sn-doped Hematite (α-Fe₂O₃) Heteroepitaxial Thin Film Photoanodes

et al. 2016

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The orientation dependence on the photoelectrochemical properties of Sn-doped hematite photoanodes was studied by means of heteroepitaxial film growth. Nb-doped SnO2 (NTO) was first grown heteroepitaxially on c, a, r, and m plane single crystal sapphire substrates in three different orientations. Hematite was then grown in the (001), (110), and (100) orientations on the NTO films. The structural, morphological, optical, and photoelectrochemical properties of the photoelectrodes were studied. The hematite photoanodes possessed high crystallinity and smooth surfaces. Hole scavenger measurements made in H2O2-containing electrolyte revealed that the flux of photo-generated holes arriving at the surface was not significantly affected by orientation. Cathodic shifts in the onset potential for water photooxidation of up to 170 mV were observed for (110) and (100) oriented hematite photoanodes as compared to (001) oriented films. These results suggest that varying the orientation of heteroepitaxial thin film Sndoped hematite photoelectrodes primarily affects charge transfer into the electrolyte arising from the surface properties of the different crystal faces rather than affecting hole transport through the bulk under illumination. Electrochemical techniques were then used to probe the existence of surface states which were found to vary with both exposed crystal face as well as foreign dopant inclusion. Kelvin probe force microscopy (KPFM) measurements revealed correlation between the work function of the hematite films (measured in air) and the flat-band and onset potentials for water photo-oxidation (in alkaline aqueous solution).

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Solid–liquid-type solar cell based on α-Fe₂O₃heterostructures for solar energy harvesting

Cited by 18 publications

References 44 publications

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

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

Wide-bandgap semiconductor materials: For their full bloom

Effect of Orientation on Bulk and Surface Properties of Sn-doped Hematite (α-Fe₂O₃) Heteroepitaxial Thin Film Photoanodes

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Solid–liquid-type solar cell based on α-Fe2O3heterostructures for solar energy harvesting

Cited by 18 publications

References 44 publications

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

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

Wide-bandgap semiconductor materials: For their full bloom

Effect of Orientation on Bulk and Surface Properties of Sn-doped Hematite (α-Fe2O3) Heteroepitaxial Thin Film Photoanodes

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Product

Resources

About

Solid–liquid-type solar cell based on α-Fe₂O₃heterostructures for solar energy harvesting

Effect of Orientation on Bulk and Surface Properties of Sn-doped Hematite (α-Fe₂O₃) Heteroepitaxial Thin Film Photoanodes