MoS2/WSe2 nanohybrids for flexible paper-based photodetectors. (12th May 2021)

• Record Type: Journal Article
• Authors: Pataniya, Pratik M; Patel, Vikas; Sumesh, C K
• Is Part Of: Nanotechnology. Volume 32:Number 31(2021)
• Publication Date: 2021-05-12
• Subjects: flexible devices -- optoelectronics -- liquid-phase exfoliation -- heterostructure -- MoS2/WSe2 nanohybrids; Nanotechnology -- Periodicals; Nanotechnology -- Periodicals; Nanotechnology; Publications périodiques; Nanotechnologies; Periodicals; 620.5
• DOI: 10.1088/1361-6528/abf77a
• Languages: English
• ISSNs: 0957-4484

Abstract

Abstract: Flexible photodetectors functionalized by transition metal dichalcogenides have attracted great attention due to their excellent photo-harvesting efficiency. However, the field of optoelectronics still requires advancement in the production of large-area, broad band and flexible photodetectors. Here we report a flexible, stable, broad band and fast photodetector based on a MoS2 /WSe2 heterostructure on ordinary photocopy paper with pencil-drawn graphite electrodes. Ultrathin MoS2 /WSe2 nanohybrids have been synthesized by an ultrahigh yield liquid-phase exfoliation technique. The thin sheets of WSe2, and MoS2 contain two to four layers with a highly c-oriented crystalline structure. Subsequently, the photodetector was exploited under ultra-broad spectral range from 400 to 780 nm. The photodetector exhibits excellent figure of merit such as on/off ratio of the order of 10 3, photoresponsivity of 124 mA W −1 and external quantum efficiency of 23.1%. Encouragingly, rise/decay time of about 0.1/0.3 s was realized, which is better than in previous reports on paper-based devices.