Ultrafast response of monolayer molybdenum disulfide photodetectors.
Ultrafast response of monolayer molybdenum disulfide photodetectors.
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DOI：
10.1038/ncomms9831
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发表时间：
2015-11-17
影响因子：
16.6
通讯作者：
Rana F
中科院分区：
文献类型：
--
作者：
Wang H;Zhang C;Chan W;Tiwari S;Rana F
单原子层过渡金属二硫族化合物在可见光至近红外波长范围内表现出的强光发射和吸收特性，使其在光电领域具有广泛的应用前景。在这项工作中，使用双脉冲光电压相关技术，我们表明单层二硫化钼光电探测器可以具有短至3 ps的固有响应时间，这意味着光电探测带宽可达300 GHz。这种材料中的电子空穴和激子寿命短，因此光电探测器的响应速度快。大多数二维金属二硫化物的光激发载流子的复合以非辐射过程为主，其中最显著的是俄歇散射。这些器件的快速响应时间和易于制造，使它们成为低成本超快光通信链路的兴趣。二维过渡金属二硫族化合物在光电应用中很有用，但光电探测器运行速度的最终限制是未知的。在这里，作者证明了单层二硫化钼的光学响应时间可以短至3皮秒。
The strong light emission and absorption exhibited by single atomic layer transitional metal dichalcogenides in the visible to near-infrared wavelength range make them attractive for optoelectronic applications. In this work, using two-pulse photovoltage correlation technique, we show that monolayer molybdenum disulfide photodetector can have intrinsic response times as short as 3 ps implying photodetection bandwidths as wide as 300 GHz. The fast photodetector response is a result of the short electron–hole and exciton lifetimes in this material. Recombination of photoexcited carriers in most two-dimensional metal dichalcogenides is dominated by nonradiative processes, most notable among which is Auger scattering. The fast response time, and the ease of fabrication of these devices, make them interesting for low-cost ultrafast optical communication links. Two-dimensional transition-metal dichalcogenides are useful for optoelectronic applications, but the ultimate limit on the speed of photodetector operation is unknown. Here, the authors show that the optical response time of monolayer molybdenum disulfide can be as short as three picoseconds.