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Flexible and High‐Performance All‐2D Photodetector for Wearable Devices
Author(s) -
Yao Jiandong,
Yang Guowei
Publication year - 2018
Publication title -
small
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.785
H-Index - 236
eISSN - 1613-6829
pISSN - 1613-6810
DOI - 10.1002/smll.201704524
Subject(s) - photodetector , materials science , optoelectronics , photodetection , responsivity , quantum efficiency , heterojunction , specific detectivity , fabrication , semiconductor , photoelectric effect , electrode , nanotechnology , physics , medicine , alternative medicine , pathology , quantum mechanics
Emerging novel applications at the forefront of innovation horizon raise new requirements including good flexibility and unprecedented properties for the photoelectronic industry. On account of diversity in transport and photoelectric properties, 2D layered materials have proven as competent building blocks toward next‐generation photodetectors. Herein, an all‐2D Bi 2 Te 3 ‐SnS‐Bi 2 Te 3 photodetector is fabricated with pulsed‐laser deposition. It is sensitive to broadband wavelength from ultraviolet (370 nm) to near‐infrared (808 nm). In addition, it exhibits great durability to bend, with intact photoresponse after 100 bend cycles. Upon 370 nm illumination, it achieves a high responsivity of 115 A W −1 , a large external quantum efficiency of 3.9 × 10 4 %, and a superior detectivity of 4.1 × 10 11 Jones. They are among the best figures‐of‐merit of state‐of‐the‐art 2D photodetectors. The synergistic effect of SnS's strong light–matter interaction, efficient carrier separation of Bi 2 Te 3 –SnS interface, expedite carrier injection across Bi 2 Te 3 –SnS interface, and excellent carrier collection of Bi 2 Te 3 topological insulator electrodes accounts for the superior photodetection properties. In summary, this work depicts a facile all‐in‐one fabrication strategy toward a Bi 2 Te 3 ‐SnS‐Bi 2 Te 3 photodetector. More importantly, it reveals a novel all‐2D concept for construction of flexible, broadband, and high‐performance photoelectronic devices by integrating 2D layered metallic electrodes and 2D layered semiconducting channels.