论文标题
电流引起的石墨烯Thz辐射探测器中光响应的增强
Current-induced enhancement of photo-response in graphene THz radiation detectors
论文作者
论文摘要
石墨烯Thz辐射检测器中的热电读数需要在石墨烯通道上达到P-N连接。即使没有故意的P-N连接，电极/天线附近也可以通过与金属的接近度存在两个潜在连接。在对称结构中，这些连接是背对背连接的，因此在AC信号的整流方面相互平衡。由于Peltier效应，小型直流电流导致在另一个P-N连接中的一单和冷却，从而破坏对称性。然后，P-N连接不再取消，从而产生了大大增强的回流信号。这允许简化设计并有效控制THZ辐射探测器的灵敏度。
Thermoelectric readout in a graphene THz radiation detector requires a p-n junction across the graphene channel. Even without an intentional p-n junction, two latent junctions can exist in the vicinity of the electrodes/antennas through the proximity to metal. In a symmetrical structure, these junctions are connected back-to-back and therefore counterbalance each other with regard to rectification of the ac signal. Because of the Peltier effect, a small dc current results in additional heating in one- and cooling in another p-n junction, thereby breaking the symmetry. The p-n junctions then no longer cancel, resulting in a greatly enhanced rectified signal. This allows to simplify the design and effectively control the sensitivity of the THz-radiation detectors.
