石墨烯
材料科学
退火(玻璃)
响应度
光电探测器
光电子学
氧化物
异质结
大气温度范围
光电导性
纳米技术
复合材料
物理
气象学
冶金
作者
Jianguo Wen,Yingying Niu,Pengfei Wang,Meng Chen,Weidong Wu,Yang Cao,Jia‐Lin Sun,Ming Zhao,Daming Zhuang,Yingxin Wang
出处
期刊:Carbon
[Elsevier]
日期:2019-07-09
卷期号:153: 274-284
被引量:35
标识
DOI:10.1016/j.carbon.2019.07.033
摘要
Self-powered ultra-broadband photothermoelectric photodetectors based on free-standing reduced graphene oxide (RGO) films annealed under various temperatures (200–1000 °C) are developed for the first time. The preparation process of the free-standing RGO films is simple, low-cost, and scalable. An interesting phenomenon was found that with increasing annealing temperature, responsivities of RGO-based photodetectors decreased across the ultra-broadband range from ultraviolet (375 nm) to terahertz (118.8 μm) regions. The dependence of device responsivity on annealing temperature is derived from differences in the oxygen functional groups present on the RGO films. The negative sheet Hall coefficients of the annealed RGO films confirmed that they behaved as n-type semiconductors, indicating that electron-donating groups dominated in all the annealed free-standing RGO films. The content of electron-donating groups gradually decrease as the annealing temperature rose. The response times of our devices (<50 ms) are approximately one to three orders of magnitude faster than the reported ultra-broadband photodetectors based on supported RGO films and silicon-based heterojunctions. Since our photodetectors are macro-electronic devices, the response time could be further decreased by reducing the channel length. Considering the properties of self-powered, low cost, easy preparation, and ultra-broadband response, our RGO photodetectors have potential applications for integrated optoelectronics.
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