Journal ArticleDOI
Defect-engineered optical bandgap in self-assembled TiO2 nanorods on Si pyramids
TLDR
In this article, the authors investigated the optical-bandgap (Eg) of self-assembled crystalline TiO2 nanorods to amorphous layer and the corresponding impact on Si pyramids by irradiating with 50'keV Ar+-ions.Abstract:
Transformation of self-assembled crystalline TiO2 nanorods to amorphous layer, and the corresponding impact on optical-bandgap (Eg) on Si pyramids are investigated by irradiating with 50 keV Ar+-ions. Initially, Eg is found to be reduced from 3.23 to 2.94 eV up to a fluence of 1 × 1016 ions/cm2, and discussed in terms of the rise in oxygen vacancies (VO). However, a sudden increase in Eg to 3.38 eV is detected at a fluence of 1 × 1017 ions/cm2 through evolution of voids by over-saturating VO, manifesting the appearance of degenerate states by shifting the Fermi level above the conduction band minimum via Burstein-Moss effect.read more
Citations
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Journal ArticleDOI
Impact of Self-Trapped Excitons on Blue Photoluminescence in TiO2 Nanorods on Chemically Etched Si Pyramids
C. P. Saini,A. Barman,Debosmita Banerjee,O. Grynko,S. Prucnal,Mukul Gupta,D. M. Phase,Anil K. Sinha,D. Kanjilal,Wolfgang Skorupa,Aloke Kanjilal +10 more
TL;DR: In this article, temperature-dependent photoluminescence (PL) of titanium oxide (TiO2) shows an evolution of blue emission when exposed to 50 keV Ar+ ions.
Journal ArticleDOI
500 keV Ar 2+ ion irradiation induced anatase to brookite phase transformation and ferromagnetism at room temperature in TiO 2 thin films
TL;DR: Mohanty et al. as discussed by the authors studied the evolution of structure and magnetic properties after irradiating the TiO2 thin films with 500 keV Ar2+ ions and reported anatase to brookite phase transformation.
Journal ArticleDOI
Role of Oxygen Vacancy on the Hydrophobic Behavior of TiO2 Nanorods on Chemically Etched Si Pyramids
C. P. Saini,A. Barman,D. Das,Biswarup Satpati,Satyaranjan Bhattacharyya,D. Kanjilal,Alexey Ponomaryov,Sergei Zvyagin,Aloke Kanjilal +8 more
TL;DR: In this article, the authors investigated the hydrophobicity of self-assembled TiO2 nanorods on chemically etched Si pyramids by irradiating with 50 keV Ar+-ions at room temperature.
Journal ArticleDOI
White light-driven photo response of TiO2 thin films: Influence of substrate texturing
Ranveer Singh,Ranveer Singh,Mohit Kumar,Mahesh Saini,Mahesh Saini,Biswarup Satpati,Tapobrata Som,Tapobrata Som +7 more
TL;DR: In this paper, the role of film thickness on white light-driven photo response and electrical properties of TiO2/Si heterojunctions is investigated, and it is observed that the surface reflectance of conformally grown overlayers on textured-Si substrates can be brought down to 073% for 5'nm and 077% for 20'nm.
Journal ArticleDOI
Effect of 500 keV Ar2+ ion irradiation on structural and magnetic properties of TiO2 thin films annealed at 900 °C
TL;DR: In this paper, the structural and magnetic properties of TiO2 thin films prepared by electron beam evaporation technique, annealed at 900 °C and irradiated with 500 keV Ar2+ ions were investigated.
References
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Journal ArticleDOI
The surface science of titanium dioxide
TL;DR: Titanium dioxide is the most investigated single-crystalline system in the surface science of metal oxides, and the literature on rutile (1.1) and anatase surfaces is reviewed in this paper.
Journal ArticleDOI
SRIM – The stopping and range of ions in matter (2010)
TL;DR: SRIM as discussed by the authors is a software package concerning the stopping of ion/atom collisions, and individual interatomic potentials have been included for all ion and atom collisions in the SRIM package.
Journal ArticleDOI
Band alignment of rutile and anatase TiO2
David O. Scanlon,Charles W. Dunnill,John Buckeridge,Stephen A. Shevlin,Andrew J. Logsdail,Scott M. Woodley,C. Richard A. Catlow,Michael Powell,Robert G. Palgrave,Ivan P. Parkin,Graeme W. Watson,Thomas W. Keal,Paul Sherwood,Aron Walsh,Alexey A. Sokol +14 more
TL;DR: It is demonstrated, through a combination of state-of-the-art materials simulation techniques and X-ray photoemission experiments, that a type-II, staggered, band alignment of ~ 0.4 eV exists between anatase and rutile with anatase possessing the higher electron affinity, or work function.
Journal ArticleDOI
The Role of Interstitial Sites in the Ti3d Defect State in the Band Gap of Titania
Stefan Wendt,Stefan Wendt,Phillip Sprunger,Phillip Sprunger,Estephania Lira,Estephania Lira,Georg K. H. Madsen,Georg K. H. Madsen,Zhongshan Li,Zhongshan Li,Jonas Ø. Hansen,Jonas Ø. Hansen,J. Matthiesen,J. Matthiesen,Asger Blekinge-Rasmussen,Asger Blekinge-Rasmussen,E. Lægsgaard,E. Lægsgaard,Bjørk Hammer,Bjørk Hammer,Flemming Besenbacher,Flemming Besenbacher +21 more
TL;DR: It is argued that Ti interstitials in the near-surface region may play a key role in and may dictate the ensuing surface chemistry, such as providing the electronic charge required for O2 adsorption and dissociation.