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ACS Appl Mater Interfaces. 2019 May 1;11(17):15741-15747. doi: 10.1021/acsami.9b00181. Epub 2019 Apr 9.

van der Waals Transition-Metal Oxide for Vis-MIR Broadband Photodetection via Intercalation Strategy.

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Siyuan Laboratory, Guangzhou Key Laboratory of Vacuum Coating Technologies and New Energy Materials, Guangdong Provincial Engineering Technology Research Center of Vacuum Coating Technologies and New Energy Materials, Department of Physics , Jinan University , Guangzhou , Guangdong 510632 , China.
Department of Electronic Engineering and Materials Science and Technology Research Center , The Chinese University of Hong Kong , Hong Kong SAR 999077 , China.
School of Electronic Science and Technology , Nanjing University , Nanjing 210093 , China.


Defects engineering can broaden the absorption band of wide band gap van der Waals (vdW) materials to the visible or near-IR regime at the expense of material stability and photoresponse speed. Herein, we introduce an atomic intercalation method that brings the wide band gap vdW α-MoO3 for vis-MIR broadband optoelectronic conversion. We confirm experimentally that intercalation significantly enhances photoabsorption and electrical conductivity buts effects negligible change to the lattice structure as compared with ion intercalation. Charge transfer from the Sn atom to the lattices induces an optoelectrical change. As a result, the Sn-intercalated α-MoO3 shows room temperature, air stable, broadband photodetection ability from 405 nm to 10 μm, with photoresponsivity better than 9.0 A W-1 in 405-1500 nm, ∼0.4 A W-1 at 3700 nm, and 0.16 A W-1 at 10 μm, response time of ∼0.1 s, and peak D* of 7.3 × 107 cm Hz0.5 W-1 at 520 nm. We further reveal that photothermal effect dominates in our detection range by real-time photothermal-electrical measurement, and the materials show a high temperature coefficient of resistance value of -1.658% K-1 at 300 K. These results provide feasible route for designing broadband absorption materials for photoelectrical, photothermal, or thermal-electrical application.


2D material; broadband absorption; intercalation; metal oxide; photodetection


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