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Open AccessArticle

Tunable Photodetectors via In Situ Thermal Conversion of TiS3 to TiO2

1
Instituto Madrileño de Estudios Avanzados en Nanociencia (IMDEA-Nanociencia), Campus de Cantoblanco, E-28049 Madrid, Spain
2
Nanoscale Physics Device Lab (NPDL), Department of Physics, University of Kurdistan, 66177-15175 Sanandaj, Iran
3
Materials Science Factory, Instituto de Ciencia de Materiales de Madrid (ICMM-CSIC), E-28049 Madrid, Spain
4
Materials of Interest in Renewable Energies Group (MIRE Group), Dpto. de Física de Materiales, Universidad Autónoma de Madrid, UAM, Campus de Cantoblanco, E-28049 Madrid, Spain
5
Kavli Institute of Nanoscience, Delft University of Technology, Lorentzweg 1, 2628 CJ Delft, The Netherlands
6
Nano-Bio Spectroscopy Group and European Theoretical Spectroscopy Facility (ETSF), Universidad del País Vasco CFM CSIC-UPV/EHU-MPC & DIPC, Av.Tolosa 72, 20018 San Sebastián, Spain
7
Institute for Materials Science and Max Bergmann Center of Biomaterials, TU Dresden, 01062 Dresden, Germany
8
National Institute for Materials Science, Namiki 1-1, Tsukuba, Ibaraki 305-0044, Japan
9
IKERBASQUE, Basque Foundation for Science, 48013 Bilbao, Spain
10
Instituto Nicolás Cabrera, Universidad Autónoma de Madrid, UAM, Campus de Cantoblanco, E-28049 Madrid, Spain
*
Authors to whom correspondence should be addressed.
These authors contributed equally to this work.
Nanomaterials 2020, 10(4), 711; https://doi.org/10.3390/nano10040711
Received: 2 March 2020 / Revised: 17 March 2020 / Accepted: 27 March 2020 / Published: 9 April 2020
(This article belongs to the Special Issue 2D Materials and Their Heterostructures and Superlattices)
In two-dimensional materials research, oxidation is usually considered as a common source for the degradation of electronic and optoelectronic devices or even device failure. However, in some cases a controlled oxidation can open the possibility to widely tune the band structure of 2D materials. In particular, we demonstrate the controlled oxidation of titanium trisulfide (TiS3), a layered semicon-ductor that has attracted much attention recently thanks to its quasi-1D electronic and optoelectron-ic properties and its direct bandgap of 1.1 eV. Heating TiS3 in air above 300 °C gradually converts it into TiO2, a semiconductor with a wide bandgap of 3.2 eV with applications in photo-electrochemistry and catalysis. In this work, we investigate the controlled thermal oxidation of indi-vidual TiS3 nanoribbons and its influence on the optoelectronic properties of TiS3-based photodetec-tors. We observe a step-wise change in the cut-off wavelength from its pristine value ~1000 nm to 450 nm after subjecting the TiS3 devices to subsequent thermal treatment cycles. Ab-initio and many-body calculations confirm an increase in the bandgap of titanium oxysulfide (TiO2-xSx) when in-creasing the amount of oxygen and reducing the amount of sulfur. View Full-Text
Keywords: 2D materials; photodetectors; oxidation; TiS3; TiO2; Raman spectroscopy; DFT GW 2D materials; photodetectors; oxidation; TiS3; TiO2; Raman spectroscopy; DFT GW
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MDPI and ACS Style

Ghasemi, F.; Frisenda, R.; Flores, E.; Papadopoulos, N.; Biele, R.; Perez de Lara, D.; van der Zant, H.S.J.; Watanabe, K.; Taniguchi, T.; D’Agosta, R.; Ares, J.R.; Sánchez, C.; Ferrer, I.J.; Castellanos-Gomez, A. Tunable Photodetectors via In Situ Thermal Conversion of TiS3 to TiO2. Nanomaterials 2020, 10, 711.

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