石墨烯光电探测器的热场分布

Thermal Field Distribution of Graphene Photodetector

与其他光电探测器相比,基于石墨烯的光电探测器具有响应度好、响应频率和探测灵敏度高等优点。在器件工作期间,温度对其性能的影响不可忽略。为了解决由于温度过高而带来的性能不稳定问题,针对光电探测器建立了三维热传导模型研究其温度分布情况,并利用显式差分法求解其数值解。等离子体增强型石墨烯光电探测器具有响应度高和频带宽等特点,因此以等离子体增强型石墨烯光电探测器为例进行计算,结果为等离子体温度为306.6 K,探测器边界温度为305.7 K,利用COMSOL软件验证得到等离子体温度为306.26 K,探测器边界温度为305.98 K,相对误差分别为0.11%和0.091%。由此证明了所建立模型的准确性和实用性,这对光电探测器设计具有一定指导意义。

Compared with other photodetectors, photodetectors based on graphene have the advantages of good responsivity, high response frequency and high detection sensitivity. The influence of temperature on the performance of the device during operation cannot be ignored. In order to solve the problem of unstable performance caused by high temperature, a three-dimensional thermal conduction model for photodetectors was established to study the distribution of temperature. And its numerical solution was solved by the explicit difference method. Plasmonically enhanced graphene photodetectors have the characteristics of high responsivity and high response frequency, so the plasma-enhanced graphene photodetector was taken as an example to calcultate. The result is that the plasma temperature is 306.6 K and the detector boundary temperature is 305.7 K. COMSOL software was used to verify the results. The plasma temperature is 306.26 K and the detector boundary temperature is 305.98 K. The relative errors are 0.11% and 0.091%, respectively. It proves the accuracy and practicability of the model, which has certain guiding significance for the photodetector device design.