Paper-Based Flexible Photodetector Functionalized by WSe2 Nanodots

• Published in: ACS applied nano materials Vol. 2; no. 5; pp. 2758 - 2766
• Main Authors: Pataniya, Pratik, Zankat, Chetan K, Tannarana, Mohit, Sumesh, C. K, Narayan, Som, Solanki, G. K, Patel, K. D, Pathak, V. M, Jha, Prafulla K
• Format: Journal Article
• Language: English
• Published: American Chemical Society 24-05-2019
• Subjects: paper -based photodetector; oxygen-assisted mechanism; sonochemical exfoliation; WSe2 nanodots; air stability; flexible photodetector
• ISSN: 2574-0970; 2574-0970
• DOI: 10.1021/acsanm.9b00266

Ultrathin two-dimensional WSe2 has attracted huge attention due to its potential applications in future wearable electronics. Here, we demonstrate the flexible and high-performance photodetector using high-yield sonochemical exfoliation technique. An efficient and low cost fabrication strategy using Whatman filter paper is adopted for the first time for fabrication of a photodetector based on WSe2 nanodots (NDs). The WSe2 NDs have hexagonal lattice structure with P63/mmc and have indirect band gap of 1.63 eV. The exfoliation and number of layers in WSe2 NDs is confirmed by Raman, absorption, and photoluminescence spectroscopy. Subsequently, the photodetector based on WSe2 NDs is fabricated. The device shows excellent photoresponse with response time of 0.68 s and photoresponsivity of 17.78 mAW–1 and detectivity of 5.86 × 1010 Jones for 5 V. The device is analyzed for bias of 0 to 100 V and responsivity is enhanced up to 796.18 mA W–1 at 100 V bias. Furthermore, the paper-based detector exhibited great flexibility and air stability. The performance of the photodetector was also recorded in the spectral range 390 to 880 nm. Over all, the performance paper-based device advocates a novel pathway for flexible and intelligent electronics.