5 years ago

Wide-Range Controllable Doping of Tungsten Diselenide (WSe2) based on Hydrochloric Acid Treatment

Wide-Range Controllable Doping of Tungsten Diselenide (WSe2) based on Hydrochloric Acid Treatment
Jinok Kim, Hyo-Jik Nam, Jin-Hong Park
In recent years, chemical doping based on the charge-transfer phenomenon has been actively studied for transition-metal dichalcogenide (TMD) materials owing to its simplicity and efficiency. However, these chemical-doping techniques have been controlled mostly in a high-doping-concentration (degenerate) regime, consequently limiting the use of the techniques to TMD devices. Herein we report on the wide-range-controllable p-type doping of WSe2 based on hydrochloric acid (HCl) treatment. The doping concentration was controlled broadly between 1.67 × 1011 cm–2 and 1.32 × 1012 cm–2 by adjusting the concentration of the HCl solution. We then confirmed that the performances of the WSe2-based transistor and photodetector devices were improved (increases in the threshold voltage, field-effect mobility, on-current, and photoresponsivity with the doping concentration). Finally, we alleviated the degradation of the HCl doping effects in air by providing protection from the moisture in the air by using poly(methyl methacrylate) encapsulation (with which there was a change in the performance parameters of <8% after 170 h, relative to the values obtained immediately after doping). We expect that our widely controllable p-doping method will be used for the optimization of future TMD-based devices.

Publisher URL: http://dx.doi.org/10.1021/acs.jpcc.7b04439

DOI: 10.1021/acs.jpcc.7b04439

You might also like
Discover & Discuss Important Research

Keeping up-to-date with research can feel impossible, with papers being published faster than you'll ever be able to read them. That's where Researcher comes in: we're simplifying discovery and making important discussions happen. With over 19,000 sources, including peer-reviewed journals, preprints, blogs, universities, podcasts and Live events across 10 research areas, you'll never miss what's important to you. It's like social media, but better. Oh, and we should mention - it's free.

  • Download from Google Play
  • Download from App Store
  • Download from AppInChina

Researcher displays publicly available abstracts and doesn’t host any full article content. If the content is open access, we will direct clicks from the abstracts to the publisher website and display the PDF copy on our platform. Clicks to view the full text will be directed to the publisher website, where only users with subscriptions or access through their institution are able to view the full article.