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Proceedings Paper

Low cost flexible 1.1 μm -1.6 μm photodetector fabricated by hydrothermal grown large area MoSe2 nanostructures
Author(s): Veerendra Dhyani; Preeti Kumari; Sarmistha Maity; Samaresh Das
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Paper Abstract

Infrared photoresponse in large area MoSe2 nanostructured films on flexible substrates has been presented in this work. Nanostructures of MoSe2 have been grown by hydrothermal route using sodium molybdate and selenium (Se) as a precursor in hydrazine and water solution. The process parameters such as ambient pressures and temperature have been optimized to get the nanostructure with superior photosensitivity in IR regime. The adopted synthesis process results in the suspended particles composed of MoSe2 nanostructure, which later transfer in ethanol. This solution has been coated on flexible poly-ethylene terephthalate (PET) substrates for the device fabrication by dip coating. Scanning electron microscopy and high-resolution transmission electron microscopy (HR-TEM) reveals that the as-prepared MoSe2 has particle-like features. The photoresponse of the devices was measured in the wavelength range 1000 nm -1600 nm. As-obtained flexible photodetectors showed responsivity of ~ 2.6 A/W (at 500 mV bias) and rise/fall time 3.9 sec and 2.9 sec under the illumination of 1550 nm. It was also noted that for the small bias voltages, our MoSe2 films possess excellent photoresponse as the at 50 mV bias the responsivity was recorded up to 127 mA/W for 1550 nm light). The simple approach used in this work should facilitate the development of low cost and low power IR photodetectors for next-generation flexible optoelectronics.

Paper Details

Date Published: 11 April 2019
PDF: 9 pages
Proc. SPIE 11028, Optical Sensors 2019, 110282G (11 April 2019); doi: 10.1117/12.2521949
Show Author Affiliations
Veerendra Dhyani, Indian Institute of Technology Delhi (India)
Preeti Kumari, Indian Institute of Technology Delhi (India)
Sarmistha Maity, Indian Institute of Technology Delhi (India)
Samaresh Das, Indian Institute of Technology Delhi (India)

Published in SPIE Proceedings Vol. 11028:
Optical Sensors 2019
Francesco Baldini; Jiri Homola; Robert A. Lieberman, Editor(s)

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