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Submillimeter 2D Bi~2~Se~3~ Flakes toward High‐Performance Infrared Photodetection at Optical Communication Wavelength by Fakun Wang; Leigang Li; Wenjuan Huang; Liang Li; Bao Jin; Huiqiao Li; Tianyou Zhai is a Engineering article available to read on EtoBox.

What is Submillimeter 2D Bi~2~Se~3~ Flakes toward High‐Performance Infrared Photodetection at Optical Communication Wavelength about?

## Abstract Infrared detection at optical communication wavelength is of great significance because of their diverse commercial and military communication applications. The layered Bi~2~Se~3~ with a narrow band gap of 0.3 eV is regarded as a promising candidate toward high‐performance terahertz to infrared applications. However, the controllable synthesis of large‐size ultrathin Bi~2~Se~3~ flakes remains a challenge owing to complex nucleation process and infrared telecommunication photodetectors based on Bi~2~Se~3~ flakes are rarely reported. Here, large size (submillimeter: 0.2–0.4 mm in lateral dimensions) and ultrathin (thickness: 3 nm to few nanometers) 2D Bi~2~Se~3~ flakes with high crystal quality are obtained by suppressing the nucleation density. More importantly, back‐gate field‐effect transistor based on Bi~2~Se~3~ flake exhibits an ultrahigh on/off current ratio of 10^6^ and competitive mobility of 39.4 cm^2^ V^−1^ s^−1^. Moreover, excellent on/off ratio of 972.5, responsivity of 23.8 A W^−1^, and external quantum efficiency of 2035% are obtained from Bi~2~Se~3~‐based photodetector at 1456 nm in the E‐band of the telecommunication range. With controlled morphology and e

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Author

Fakun Wang; Leigang Li; Wenjuan Huang; Liang Li; Bao Jin; Huiqiao Li; Tianyou Zhai

Publisher

Wiley

Published

2018

Language

EN

Field

Engineering (Physical Sciences)