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Enabling and Controlling Negative Photoconductance of FePS3 Nanosheets by Hot Carrier Trapping
Advanced Optical Materials ( IF 8.0 ) Pub Date : 2020-03-11 , DOI: 10.1002/adom.202000201 Zhenwei Ou 1 , Ti Wang 1 , Jibo Tang 1 , Xinrong Zong 2 , Wei Wang 2 , Quanbing Guo 1 , Yuhao Xu 1 , Chao Zhu 3 , Lin Wang 2 , Wei Huang 2, 4 , Hongxing Xu 1
Advanced Optical Materials ( IF 8.0 ) Pub Date : 2020-03-11 , DOI: 10.1002/adom.202000201 Zhenwei Ou 1 , Ti Wang 1 , Jibo Tang 1 , Xinrong Zong 2 , Wei Wang 2 , Quanbing Guo 1 , Yuhao Xu 1 , Chao Zhu 3 , Lin Wang 2 , Wei Huang 2, 4 , Hongxing Xu 1
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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.
中文翻译：
通过热载流子陷阱实现和控制FePS3纳米片的负光电导
在过去的十年中，二维材料引起了极大的关注，并且近年来，二维尺度的磁性材料正逐渐兴起，这可能会改变当前的光学和电子应用。光电导性是众所周知的光学和电学性质，当材料的电导率通常随着电磁辐射的吸收而增加时，光电导性应该为正。在此，FePS 3从负光电导作用可控地转换为正纳米片通过激发波长的调制来实现。这些影响源自热载流子捕获的超快速过程，如瞬态吸收显微镜在定量水平上观察和研究的那样。这种热载流子俘获过程约为1.25 ps，从而导致较低的扩散常数状态（≈3.5cm 2 s -1），从而可以深入了解2D FePS 3的固有性质。有待进一步研究。结果通过实验证明了通过光学方式调节2D磁性材料的电子性能的可能性，这不仅会引起幅度的变化，而且还会引起符号的变化，从而导致人们对具有许多意想不到的多功能功能的2D光电设备有了更多的了解和可能性。属性。
更新日期：2020-03-11
中文翻译：
通过热载流子陷阱实现和控制FePS3纳米片的负光电导
在过去的十年中，二维材料引起了极大的关注，并且近年来，二维尺度的磁性材料正逐渐兴起，这可能会改变当前的光学和电子应用。光电导性是众所周知的光学和电学性质，当材料的电导率通常随着电磁辐射的吸收而增加时，光电导性应该为正。在此，FePS 3从负光电导作用可控地转换为正纳米片通过激发波长的调制来实现。这些影响源自热载流子捕获的超快速过程，如瞬态吸收显微镜在定量水平上观察和研究的那样。这种热载流子俘获过程约为1.25 ps，从而导致较低的扩散常数状态（≈3.5cm 2 s -1），从而可以深入了解2D FePS 3的固有性质。有待进一步研究。结果通过实验证明了通过光学方式调节2D磁性材料的电子性能的可能性，这不仅会引起幅度的变化，而且还会引起符号的变化，从而导致人们对具有许多意想不到的多功能功能的2D光电设备有了更多的了解和可能性。属性。
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