Flowing water can be used as an energy source for generators,providing a major part of the energy for daily life.However,water is rarely used for information or electronic devices.Herein,we present the feasibility of ...Flowing water can be used as an energy source for generators,providing a major part of the energy for daily life.However,water is rarely used for information or electronic devices.Herein,we present the feasibility of a polarized liquid-triggered photodetector in which polarized water is sandwiched between graphene and a semiconductor.Due to the polarization and depolarization processes of water molecules driven by photogenerated carriers,a photo-sensitive current can be repeatedly produced,resulting in a high-performance photodetector.The response wavelength of the photodetector can be fine-tuned as a result of the free choice of semiconductors as there is no requirement of lattice match between graphene and the semiconductors.Under zero voltage bias,the responsivity and specific detectivity of Gr/NaCl(0.5 M)W/N-GaN reach values of 130.7 mA/W and 2.3×10^(9)Jones under 350 nm illumination,respectively.Meanwhile,using a polar liquid photodetector can successfully read the photoplethysmography signals to produce accurate oxygen blood saturation and heart rate.Compared with the commercial pulse oximetry sensor,the average errors of oxygen saturation and heart rate in the designed photoplethysmography sensor are~1.9%and~2.1%,respectively.This study reveals that water can be used as a high-performance photodetector in informative industries.展开更多
基金support from the National Natural Science Foundation of China(Nos.51202216,51551203,and 61774135)the Distinguished Youth Fund of Zhejiang Natural Science Foundation of China(LR21F040001)+1 种基金the Special Foundation of Young Professor of Zhejiang University(2013QNA5007)support from the China Postdoctoral Science Foundation(2021M692767).
文摘Flowing water can be used as an energy source for generators,providing a major part of the energy for daily life.However,water is rarely used for information or electronic devices.Herein,we present the feasibility of a polarized liquid-triggered photodetector in which polarized water is sandwiched between graphene and a semiconductor.Due to the polarization and depolarization processes of water molecules driven by photogenerated carriers,a photo-sensitive current can be repeatedly produced,resulting in a high-performance photodetector.The response wavelength of the photodetector can be fine-tuned as a result of the free choice of semiconductors as there is no requirement of lattice match between graphene and the semiconductors.Under zero voltage bias,the responsivity and specific detectivity of Gr/NaCl(0.5 M)W/N-GaN reach values of 130.7 mA/W and 2.3×10^(9)Jones under 350 nm illumination,respectively.Meanwhile,using a polar liquid photodetector can successfully read the photoplethysmography signals to produce accurate oxygen blood saturation and heart rate.Compared with the commercial pulse oximetry sensor,the average errors of oxygen saturation and heart rate in the designed photoplethysmography sensor are~1.9%and~2.1%,respectively.This study reveals that water can be used as a high-performance photodetector in informative industries.
