论文标题
自驱动的照片偏振水分子触发石墨烯的光电探测器
Self-driven photo-polarized water molecule triggered graphene-based photodetector
论文作者
论文摘要
流水可以用作发电机的能源，为日常生活提供大部分能量。但是，水很少用于信息或电子设备。在此，我们介绍了极化液化的光电探测器的可行性，其中极化水夹在石墨烯和半导体之间。由于光生载体驱动的水分子的极化和去极化过程，可以重复产生光敏电流，从而导致高性能光电探测器。由于不需要石墨烯和半导体之间的晶格匹配，因此可以通过自由选择的半导体选择来调整光电探测器的响应波长。在零电压偏置下，GR/NaCl（0.5 m）/N-GAN的响应性和特异性检测到达到130.7 mA/W的值，2.8*10^12 Jones在350 nm照明下的琼斯。同时，使用极性液体光电探测器可以成功读取光摄影信号，以产生准确的氧气血液饱和度和心率。与商业脉搏血氧仪传感器相比，设计的光摄影传感器中的氧饱和度和心率的平均误差分别为〜1.9％和〜2.1％。这项研究传达了以下信息：水可以用作信息性行业的高性能光电检测器。
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 semiconductor. Due to the polarization and depolarization processes of water molecular under the driven of photogenerated carriers, a photo-sensitive current can be repeatably produced, resulting in a high-performance photodetector. The response wavelength of the photodetector can be finely 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)/N-GaN reaches values of 130.7 mA/W and 2.8*10^12 Jones under 350 nm illumination. 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 transfers the message that water can be used as high-performance photodetector in informative industries.
