Lin Shisheng, Liu Chang, Chen Xin, Zhang Yi, Lin Hongtao, Yu Xutao, Bo Yujiao, Lu Yanghua
College of Information Science and Electronic Engineering, Zhejiang University, Hangzhou 310027, P. R. China.
Hangzhou Gelanfeng Technology Co. Ltd, Hangzhou 310051, P. R. China.
Research (Wash D C). 2023 Jul 31;6:0202. doi: 10.34133/research.0202. eCollection 2023.
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 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.
流动的水可作为发电机的能源，为日常生活提供大部分能量。然而，水很少用于信息或电子设备。在此，我们展示了一种极化液体触发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。由于光生载流子驱动的水分子极化和去极化过程，可反复产生光敏电流，从而得到高性能的光电探测器。由于可以自由选择半导体，且石墨烯与半导体之间无需晶格匹配，因此光电探测器的响应波长可以进行微调。在零电压偏置下，Gr/NaCl(0.5M)W/N-GaN在350nm光照下的响应度和比探测率分别达到130.7mA/W和2.3×10琼斯。同时，使用极化液体光电探测器能够成功读取光电容积脉搏波信号，以产生准确的血氧饱和度和心率。与商用脉搏血氧饱和度传感器相比，所设计的光电容积脉搏波传感器中血氧饱和度和心率的平均误差分别约为1.9%和2.1%。这项研究表明，水可在信息产业中用作高性能光电探测器。
