Improved photoresponse with enhanced photoelectric contribution in fully suspended graphene photodetectors.
Improved photoresponse with enhanced photoelectric contribution in fully suspended graphene photodetectors.
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DOI：
10.1038/srep02791
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发表时间：
2013-09-27
影响因子：
4.6
通讯作者：
Yang, Eui-Hyeok
中科院分区：
文献类型：
--
作者：
Patil, Vikram;Capone, Aaron;Strauf, Stefan;Yang, Eui-Hyeok
石墨烯独特的光电性能有望在从远红外到紫外辐射的宽光谱范围内实现具有超快光响应的光电探测器。光响应的基本机制一直是最近工作的一个特别焦点，并且被发现本质上是光电或光热电的，并且通过热载流子效应增强。发现由衬底支撑的石墨烯由光电-热电效应主导，已知其比光电效应慢一个数量级。在这里，我们展示了完全悬浮的化学气相沉积生长的石墨烯微阵列，主要是由更快的光电效应。基板去除被发现，以提高四倍的光响应相比，基板支撑的微带。此外，我们表明，光电流的输入/输出曲线提供了有价值的信息，负责所产生的光电流的基本物理过程。这些发现是有希望的晶圆级制造的石墨烯光电探测器接近太赫兹截止频率。
Graphene's unique optoelectronic properties are promising to realize photodetectors with ultrafast photoresponse over a wide spectral range from far-infrared to ultraviolet radiation. The underlying mechanism of the photoresponse has been a particular focus of recent work and was found to be either photoelectric or photo-thermoelectric in nature and enhanced by hot carrier effects. Graphene supported by a substrate was found to be dominated by the photo-thermoelectric effect, which is known to be an order of magnitude slower than the photoelectric effect. Here we demonstrate fully-suspended chemical vapor deposition grown graphene microribbon arrays that are dominated by the faster photoelectric effect. Substrate removal was found to enhance the photoresponse by four-fold compared to substrate-supported microribbons. Furthermore, we show that the light-current input/output curves give valuable information about the underlying photophysical process responsible for the generated photocurrent. These findings are promising towards wafer-scale fabrication of graphene photodetectors approaching THz cut-off frequencies.
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影响因子：
35
作者：
Gu, T.;Petrone, N.;Wong, C. W.
通讯作者：
Wong, C. W.
影响因子：
10.8
作者：
Bao, Wenzhong;Myhro, Kevin;Lau, Chun Ning
通讯作者：
Lau, Chun Ning
影响因子：
17.1
作者：
Liu, Chang-Hua;Dissanayake, Nanditha M.;Zhong, Zhaohui
通讯作者：
Zhong, Zhaohui
影响因子：
10.8
作者：
Park, Jiwoong;Ahn, Y. H.;Ruiz-Vargas, Carlos
通讯作者：
Ruiz-Vargas, Carlos
影响因子：
2.1
作者：
Bolotin, K. I.;Sikes, K. J.;Stormer, H. L.
通讯作者：
Stormer, H. L.