Irradiation-induced modifications and PEC response – A case study of SrTiO3 thin films irradiated by 120 MeV Ag9+ ions

Solanki, Anjana; Shrivastava, J. P.; Upadhyay, Sumit Kumar; Sharma, Vidhika; Sharma, Poonam; Kumar, Pushpendra; Kumar, P.; Gaskell, Karen J.; Satsangi, Vibha R.; Shrivastav, Rohit; Dass, Sahab

doi:10.1016/j.ijhydene.2011.01.149

Cited by 46 publications

(24 citation statements)

References 53 publications

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“…For ions at much higher energies, known as swift heavy ions, energy transfer to electrons dominate, and individual ion tracks, with diameters of ~5 to 6 nm, have been reported for irradiation at 300 K with ions having electronic energy loss values from 20 to 50 keV/nm (92 MeV Xe to 2.0 GeV U ions) 27 28 . Swift heavy ion irradiation has also been shown to improve the photo-electrochemical activity of spin-coated SrTiO 3 thin films 29 . The production of tracks, surface hillocks and property modification are attributed to a local thermal spike produced by the transfer of energy from the electrons to the atomic structure by electron-phonon coupling.…”

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confidence: 99%

“…While these irradiation results demonstrate significant potential for modifying the structure and properties of SrTiO 3 using electrons and ions, there is a lack of fundamental understanding regarding the thermal and irradiation stability of defects in SrTiO 3 and the nature of ion tracks. Furthermore, only the effects of energy transfers to electrons have been investigated in the swift heavy ion studies 27 28 29 ; while in ion irradiation studies of SrTiO 3 significantly below the threshold for track formation, defect production and amorphization are primarily attributed to elastic energy transfers to atomic nuclei 22 23 24 , despite the comparable electronic energy loss of the ions. In this paper, we reveal the effect of atomic defects, produced by elastic energy loss, on the local response of SrTiO 3 to electronic energy loss below the threshold for amorphous track formation.…”

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Synergy of elastic and inelastic energy loss on ion track formation in SrTiO3

Weber

Zarkadoula

Pakarinen

et al. 2015

Sci Rep

101

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While the interaction of energetic ions with solids is well known to result in inelastic energy loss to electrons and elastic energy loss to atomic nuclei in the solid, the coupled effects of these energy losses on defect production, nanostructure evolution and phase transformations in ionic and covalently bonded materials are complex and not well understood due to dependencies on electron-electron scattering processes, electron-phonon coupling, localized electronic excitations, diffusivity of charged defects, and solid-state radiolysis. Here we show that a colossal synergy occurs between inelastic energy loss and pre-existing atomic defects created by elastic energy loss in single crystal strontium titanate (SrTiO3), resulting in the formation of nanometer-sized amorphous tracks, but only in the narrow region with pre-existing defects. These defects locally decrease the electronic and atomic thermal conductivities and increase electron-phonon coupling, which locally increase the intensity of the thermal spike for each ion. This work identifies a major gap in understanding on the role of defects in electronic energy dissipation and electron-phonon coupling; it also provides insights for creating novel interfaces and nanostructures to functionalize thin film structures, including tunable electronic, ionic, magnetic and optical properties.

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confidence: 99%

mentioning

confidence: 99%

Synergy of elastic and inelastic energy loss on ion track formation in SrTiO3

Weber

Zarkadoula

Pakarinen

et al. 2015

Sci Rep

101

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“…4 The irradiated BaSrTiO 3 thin films at the lowest fluence featured an approximately two-fold increase, whereas strontium titanate thin films irradiated at 3 10 12 ions/cm 2 featured a four-fold increase, in photocurrent density relative to pristine sample. 5 The photoelectrochemical response of Cu 2 O (copper oxide) thin films irradiated with 100MeV Ni 10C ions at fluence 5 10 11 ions/cm 2 was a photocurrent (7mA=cm 2 ) that was significantly higher than the unirradiated samples.…”

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confidence: 99%

Enhanced photoelectrochemical hydrogen production with swift heavy ion irradiation

Dass¹,

Shrivastav²,

Satsangi³

2011

SPIE Newsroom

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Conventional solar cells directly convert light to electricity. Alternatively, hydrogen production through splitting water in a photoelectrochemical cell has emerged as an advanced alternative to the conventional photovoltaic cell. The key limiting challenge in the process is to design a stable semiconductor electrode that, on exposure to sunlight, creates charge carriers that in turn produce hydrogen and oxygen. The primary requirements for suitable semiconductor photoelectrodes are sufficient solar-energy absorption, high chemical stability, and favorable band edge positions with respect to water oxidation potential. Various strategies are used to tailor semiconductor properties to suit these requirements, such as doping, dye sensitization, fabricating heterostructures of different metal oxides, developing composite nanomaterials, and nanoarchitecture design. Photoelectrochemical (PEC) performance nevertheless remains less than ideal.

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“…Besides, several approaches have been tried to optimise the optical bandgap, electrical and electronic properties of the semiconductor with regard to the splitting of water [7,8]. Researches pertaining to the use of layered/mixed semiconductors, swift heavy ion irradiation and surface modifications have been pursued with lot of optimism in recent years [9][10][11]. Plasmon mediated and fullerene modified materials have also yielded much improvement in visible light induced photocatalytic hydrogen generation [12][13][14][15].…”

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confidence: 99%

Zn1−xFexOy nanocomposites for renewable hydrogen produced efficiently via photoelectrochemical vis-a-vis photocatalytic splitting of water

et al. 2019

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Zn 1−x Fe x O y nanocomposites have been investigated for bi-functional performance towards photoelectrochemical (PEC) and photocatalytic (PC) splitting of water to produce hydrogen. Prepared at varying Zn/Fe atomic ratio via co-precipitation through controlled addition of NH 4 OH to the aqueous solution of iron (III) nitrate nonahydrate [Fe(NO 3) 3 •9H 2 O] and zinc acetate dihydrate [(CH 3 •COO) 2 Zn•2H 2 O], followed by sintering in air at 800 °C, the nanocomposites were characterized by XRD, SEM, TEM, UV-Visible optical absorption, XPS, and Mössbauer spectral analysis. Shift in bandgap energy (E g) and alterations in microstructural characteristics and electrical properties, observed with change in sample-composition, significantly influenced hydrogen generation. Plausible reasons have been offered. The optimum conditions for hydrogen generation via PEC and PC routes, not being similar, have also been worked out.

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Irradiation-induced modifications and PEC response – A case study of SrTiO3 thin films irradiated by 120 MeV Ag9+ ions

Cited by 46 publications

References 53 publications

Synergy of elastic and inelastic energy loss on ion track formation in SrTiO3

Synergy of elastic and inelastic energy loss on ion track formation in SrTiO3

Enhanced photoelectrochemical hydrogen production with swift heavy ion irradiation

Zn1−xFexOy nanocomposites for renewable hydrogen produced efficiently via photoelectrochemical vis-a-vis photocatalytic splitting of water

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