Du Ruxia, Wang Wenhui, Lin Huiwen, Zhang Xinlei, Wu Hao, Zhu Beibei, Jing Xu, Gu Xing, Ni Zhenhua, Tao Li
School of Materials Science and Engineering, Southeast University, Nanjing 211189, P.R. China.
Key Laboratory of Quantum Materials and Devices of Ministry of Education, School of Physics, Southeast University, Nanjing 211189, P.R. China.
Nanophotonics. 2024 Jun 17;13(19):3663-3670. doi: 10.1515/nanoph-2024-0084. eCollection 2024 Aug.
Different types of devices with modulable resistance are attractive for the significant potential applications such as sensors, information storage, computation, etc. Although extensive research has been reported on resistance effects, there is still a need for exploring new mechanisms that offer advantages of low power consumption, high sensitivity, and long-term stability. Here, we report a graphene-Si based spatial-dependence photo-rheostat (SDPR), which enables bipolar resistance modulation in the range of 5 mm with a resistance sensitivity exceeding 1,000 Ω/mm at operating wavelengths from visible to near infrared band (1,550 nm). Especially, at ultra-low energy consumption, the device can achieve modulation of even 5 orders of magnitude of resistance and response speed up to 10 kHz. A theoretical model based on carrier dynamics is established to reveal the diffusion and drift of carriers as a mechanism explaining such experimental phenomenon. This work provides a new avenue to modulate resistance at low power consumption as novel opto-potentiometers in various photoelectric applications.
不同类型的具有可调电阻的器件对于诸如传感器、信息存储、计算等重要潜在应用具有吸引力。尽管已经报道了关于电阻效应的广泛研究，但仍需要探索具有低功耗、高灵敏度和长期稳定性等优点的新机制。在此，我们报道了一种基于石墨烯-硅的空间依赖性光变阻器（SDPR），它能够在5毫米范围内实现双极电阻调制，在从可见光到近红外波段（1550纳米）的工作波长下，电阻灵敏度超过1000Ω/毫米。特别是，在超低能耗下，该器件能够实现高达5个数量级的电阻调制，响应速度高达10kHz。建立了基于载流子动力学的理论模型，以揭示载流子的扩散和漂移，作为解释这种实验现象的一种机制。这项工作为在各种光电应用中作为新型光电电位器以低功耗调制电阻提供了一条新途径。
