Zhu Miao, Li Xinming, Guo Yibo, Li Xiao, Sun Pengzhan, Zang Xiaobei, Wang Kunlin, Zhong Minlin, Wu Dehai, Zhu Hongwei
School of Materials Science and Engineering, State Key Laboratory of New Ceramics and Fine Processing, Key Laboratory of Materials Processing Technology of MOE, Tsinghua University, Beijing 100084, China.
Nanoscale. 2014 May 7;6(9):4909-14. doi: 10.1039/c4nr00056k.
Reduced graphene oxide (RGO) has been employed as an electrode for a series of vertically structured photodetectors. Compared with mechanically exfoliated or chemical vapor deposited graphene, RGO possesses more oxygen containing groups and defects, which are proved to be favorable to enhance the performance of photodetectors. As a matter of fact, RGO with different reduction levels can be readily obtained by varying the annealing temperature. The synthesis procedures for the RGO material are suitable for large scale production and its performance can be effectively improved by functionalization or element doping. For RGO-based devices, the Schottky junction properties and photoelectric conversion have been investigated, primarily by analyzing their current-voltage characteristics. Subsequently, the ON/OFF ratio, responsivity and detectivity of the photodetectors were closely examined, proving that the RGO material could be effectively utilized as the electrode material; also, their relationship with the RGO reduction levels has also been explored. By analyzing the response/recovery speed of the RGO-based photodetectors, we have studied the effects of oxygen-containing functional groups and crystalline defects on the photoelectric conversion.
还原氧化石墨烯（RGO）已被用作一系列垂直结构光电探测器的电极。与机械剥离或化学气相沉积的石墨烯相比，RGO具有更多的含氧基团和缺陷，事实证明这些有利于提高光电探测器的性能。实际上，通过改变退火温度可以很容易地获得具有不同还原程度的RGO。RGO材料的合成工艺适用于大规模生产，并且其性能可以通过功能化或元素掺杂得到有效改善。对于基于RGO的器件，主要通过分析其电流-电压特性来研究肖特基结特性和光电转换。随后，对光电探测器的开/关比、响应度和探测率进行了仔细研究，证明RGO材料可以有效地用作电极材料；此外，还探索了它们与RGO还原程度的关系。通过分析基于RGO的光电探测器的响应/恢复速度，我们研究了含氧官能团和晶体缺陷对光电转换的影响。
