Preprint Article Version 1 Preserved in Portico This version is not peer-reviewed

Tunable Photodetectors via in Situ Thermal Conversion of TiS3 to TiO2

Version 1 : Received: 28 February 2020 / Approved: 1 March 2020 / Online: 1 March 2020 (03:43:01 CET)

A peer-reviewed article of this Preprint also exists.

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. 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.

Journal reference: Nanomaterials 2020, 10, 711
DOI: 10.3390/nano10040711

Abstract

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 semiconductor that attracted much attention recently thanks to its quasi-1D electronic and optoelectronic 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 individual TiS3 nanoribbons and its influence on the optoelectronic properties of TiS3-based photodetectors. 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 of the bandgap of titanium oxysulfide (TiO2-xSx) when increasing the amount of oxygen and reducing the amount of sulfur.

Subject Areas

2D materials; photodetectors; oxidation; TiS3; TiO2; Raman spectroscopy; DFT GW

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