Ultraviolet-to-microwave room-temperature photodetectors based on three-dimensional graphene foams

• 作者: FENG YAN HONGLIANG ZHAO JIANQUAN YAO JIE LI QINGYAN LI QUAN SHENG TENGTENG LI YATING ZHANG YIFAN LI YONGSHENG CHEN YU YU YUXIN REN ZHEN GE ZHILIANG CHEN
• 来源期刊: 光子学研究:英文版
• 学科: 工学
• 关键词: MICROWAVE dimensional ULTRAVIOLET
• 年，卷（期）: 2020,（3）
• 页码范围: 368-374
• 页数: 7页
• 分类号: TN3

摘要

Highly sensitive broadband photodetection is of critical importance for many applications.However,it is a great challenge to realize broadband photodetection by using a single device.Here we report photodetectors(PDs)based on three-dimensional(3 D)graphene foam(GF)photodiodes with asymmetric electrodes,which show an ultra-broadband photoresponse from ultraviolet to microwave for wavelengths ranging from 10~2 to 10~6 nm.Moreover,the devices exhibit a high photoresponsivity of 10~3 A·W^-1,short response time of 43 ms,and3 d B bandwidth of 80 Hz.The high performance of the devices can be attributed to the photothermoelectric(PTE,also known as the Seebeck)effect in 3 D GF photodiodes.The excellent optical,thermal,and electrical properties of 3 D GFs offer a superior basis for the fabrication of PTE-based PDs.This work paves the way to realize ultra-broadband and high-sensitivity PDs operated at room temperature.