White-Light Photosensors Based on Ag Nanoparticle-Reduced Graphene Oxide Hybrid Materials

Micromachines

Ming-Yi Lin¹  Wei-Chen Tu²  Xiang-Sheng Liu²  Wu-Yih Uen²  Shih-Lun Chen²  Yu-Chiang Chao³  Yu-Cheng Chen⁴ 

[1] Department of Electrical Engineering, National United University, Miaoli 36003, Taiwan;Department of Electronic Engineering, Chung Yuan Christian University, Taoyuan 32023, Taiwan;Department of Physics, National Taiwan Normal University, Taipei 10610, Taiwan;School of Electrical and Electronic Engineering, Nanyang Technological University, Singapore 639798, Singapore;

关键词: photosensor;    reduced graphene oxide;    Ag nanoparticles;    solution process;    finite-difference time-domain;   

DOI  :  10.3390/mi9120655

来源: DOAJ

【 摘 要 】

The unique and outstanding electrical and optical properties of graphene make it a potential material to be used in the construction of high-performance photosensors. However, the fabrication process of a graphene photosensor is usually complicated and the size of the device also is restricted to micrometer scale. In this work, we report large-area photosensors based on reduced graphene oxide (rGO) implemented with Ag nanoparticles (AgNPs) via a simple and cost-effective method. To further optimize the performance of photosensors, the absorbance and distribution of the electrical field intensity of graphene with AgNPs was simulated using the finite-difference time-domain (FDTD) method through use of the surface plasmon resonance effect. Based on the simulated results, we constructed photosensors using rGO with 60⁻80 nm AgNPs and analyzed the characteristics at room temperature under white-light illumination for outdoor environment applications. The on/off ratio of the photosensor with AgNPs was improved from 1.166 to 9.699 at the bias voltage of −1.5 V, which was compared as a sample without AgNPs. The proposed photosensor affords a new strategy to construct cost-effective and large-area graphene films which raises opportunities in the field of next-generation optoelectronic devices operated in an outdoor environment.

【 授权许可】

Unknown