Photocurrent study of all-printed photodetectors on paper made of different transition metal dichalcogenide nanosheets

Research output: Contribution to journalArticle

  • External authors:
  • Daryl Mcmanus
  • Andrea Dalsanto
  • S. B. Selvasundaram
  • Ralph Krupke
  • Andrea Li Bassi

Abstract

We have inkjet-printed in-plane 'metal-semiconductor-metal' type photodetectors on paper, one of the cheapest flexible substrates, which is also recyclable and foldable, in contrast to traditional plastic substrates. The photodetectors are made by using graphene as electrodes and various transition metal dichalcogenides (TMDs) as photoactive component. In particular, we have tested MoS2, WS2, MoSe2 and MoTe2. Large differences in responsivity and sensitivity were observed for all of the TMDs measured, with MoS2 showing the highest sensitivity and MoTe2 producing the largest response. However, photodetectors made of MoTe2 show large decreases in responsivity after one week of exposure to air. The wavelength dependence of the responsivity in MoS2 based devices was further analyzed using a supercontinuum photocurrent spectroscopy setup, with the results suggesting a bolometric or photoelectric origin of the signal. We also report some simple approaches to enhance the device performance and tune the energy range at which the maximum in responsivity or sensitivity is observed.

Bibliographical metadata

Original languageEnglish
JournalFlexible and Printed Electronics
Volume3
Issue number3
Early online date30 Aug 2018
DOIs
Publication statusPublished - 27 Sep 2018