Flexible transition metal dichalcogenide nanosheets for band-selective photodetection

• Published in: Nature communications Vol. 6; no. 1; p. 8063
• Main Authors: Velusamy, Dhinesh Babu, Kim, Richard Hahnkee, Cha, Soonyoung, Huh, June, Khazaeinezhad, Reza, Kassani, Sahar Hosseinzadeh, Song, Giyoung, Cho, Suk Man, Cho, Sung Hwan, Hwang, Ihn, Lee, Jinseong, Oh, Kyunghwan, Choi, Hyunyoug, Park, Cheolmin
• Format: Journal Article
• Language: English
• Published: England Nature Publishing Group 02.09.2015; Nature Pub. Group
• Subjects: Bend radius; Chalcogenides; Composite materials; Infrared spectra; Investigations; Light; Metal concentrations; Metal sheets; Molybdenum compounds; Molybdenum disulfide; Nanosheets; Near infrared radiation; Photoelectric effect; Photoelectric emission; Physics; Polymers; Solvents; Thick films; Transition metal compounds
• ISSN: 2041-1723; 2041-1723
• DOI: 10.1038/ncomms9063

The photocurrent conversions of transition metal dichalcogenide nanosheets are unprecedentedly impressive, making them great candidates for visible range photodetectors. Here we demonstrate a method for fabricating micron-thick, flexible films consisting of a variety of highly separated transition metal dichalcogenide nanosheets for excellent band-selective photodetection. Our method is based on the non-destructive modification of transition metal dichalcogenide sheets with amine-terminated polymers. The universal interaction between amine and transition metal resulted in scalable, stable and high concentration dispersions of a single to a few layers of numerous transition metal dichalcogenides. Our MoSe2 and MoS2 composites are highly photoconductive even at bending radii as low as 200 μm on illumination of near infrared and visible light, respectively. More interestingly, simple solution mixing of MoSe2 and MoS2 gives rise to blended composite films in which the photodetection properties were controllable. The MoS2/MoSe2 (5:5) film showed broad range photodetection suitable for both visible and near infrared spectra.