DataVXAdvanced Optical MaterialsPaper
journal article·2020-05

Enabling and Controlling Negative Photoconductance of FePS3 Nanosheets by Hot Carrier Trapping

Zhenwei Ou, Ti Wang, Jibo Tang, Xinrong Zong, Wei Wang, Quanbing Guo, Yuhao Xu, Chao Zhu, Lin Wang, Wei Huang, Hongxing Xu

Advanced Optical Materials· Volume 8· Issue 10
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Source abstract

Abstract

Abstract 2D materials have aroused tremendous attention in the last decade, and magnetic materials of the 2D scale are rising to prominence in recent years, which may revolutionize current optical and electronic applications. Photoconductivity is a well‐known optical and electrical property, which should be positive as the conductivity of material increases typically upon the absorption of electromagnetic radiation. Here, a controllable switch fromnegative to positive photoconductivity effect of FePS3 nanosheets is enabledby the modulation of the excitation wavelengths. These effects originate from an ultrafast process of hot carrier trapping, as visualized and investigated by the transient absorption microscopy at a quantitative level. This hot carrier trapping process is about 1.25 ps resulting in a lower diffusion constant state (≈3.5 cm2 s−1), which provides deep insight into the intrinsic properties of 2D FePS3 for further study. The results demonstrate experimentally the possibility to tune the electronic properties of 2D magnetic materials by an optical way, which not only induces the change in the magnitude but also in the sign, leading to more understandings and possibilities in 2D optoelectronic devices with many unexpected and multifunctional properties.
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Research context

NanomaterialsElectronic materials

OpenAlex topics: 2D Materials and Applications · Graphene research and applications · Topological Materials and Phenomena

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

School of Physics and Technology Center for Nanoscience and Nanotechnology, and Key Laboratory of Artificial Micro‐ and Nano‐structures of Ministry of Education Wuhan University Wuhan 430072 China

Key Laboratory of Flexible Electronics & Institute of Advanced Materials Jiangsu National Synergetic Innovation Center for Advanced Materials Nanjing Tech University Nanjing 211816 China

Center for Programmable Materials School of Materials Science and Engineering Nanyang Technological University Singapore 639798 Singapore

MIIT Key Laboratory of Flexible Electronics (KLoFE) Shaanxi Key Laboratory of Flexible Electronics (KLoFE) Xi'an Key Laboratory of Flexible Electronics (KLoFE) Xi'an Key Laboratory of Biomedical Materials & Engineering Xi'an Institute of Flexible Electronics Institute of Flexible Electronics (IFE) Northwestern Polytechnical University Xi'an Shaanxi 710072 China

Funding

National Natural Science Foundation of China · National Basic Research Program of China · Natural Science Foundation of Jiangsu Province · Fundamental Research Funds for the Central Universities

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