具有超过100 GHz操作频率的柔性射频碳纳米管晶体管
Flexible radiofrequency carbon nanotube transistors operating at frequencies above 100 GHz
AI总结：
本文提出了一种基于对齐碳纳米管阵列的柔性射频晶体管，通过电热协同设计实现高频性能，展示了高电流、高跨导和低功耗特性，适用于6G通信中的柔性射频放大器。
摘要：
第六代无线通信技术（6G）的发展需要能够工作在100 GHz以上频率的终端设备。对于以人为中心的应用，这些终端应具备柔性和低功耗。然而，当前的柔性射频晶体管通常具有较低的最大频率，部分原因是柔性基板的热导率差。在这里，我们报告了一种基于对齐碳纳米管阵列的射频晶体管，其电流增益截止频率（f_T）和功率增益截止频率（f_max）均超过100 GHz。这通过使用电热协同设计来改善器件的散热和射频性能实现。这些晶体管表现出0.947 mA/μm的开启态电流、0.728 mS/μm的跨导、152 GHz的峰值外在f_T、102 GHz的峰值外在f_max以及低于200 mW/mm的功耗。我们还展示了这些设备可用于制造具有64 mW/mm输出功率和K波段11 dB功率增益的柔性射频放大器。
英文摘要：
The development of the sixth generation of wireless communications technology (6G) requires terminals that can operate at frequencies above 100 GHz. For human-centric applications, these terminals should also be flexible and have low power. However, current flexible radiofrequency transistors typically have lower maximum frequencies, in part due to the poor thermal conductivity of flexible substrates. Here, we report radiofrequency transistors that are based on aligned carbon nanotube arrays on flexible substrates and have current gain cutoff frequencies ($f_{\text{T}}$) and power gain cutoff frequencies ($f_{\text{max}}$) above 100 GHz. This is achieved by using electro-thermal co-design to improve the heat dissipation and radiofrequency performance of the devices. The transistors exhibit an on-state current of 0.947 mA $μ$m$^{-1}$, a transconductance of 0.728 mS $μ$m$^{-1}$, a peak extrinsic $f_{\text{T}}$ of 152 GHz, a peak extrinsic $f_{\text{max}}$ of 102 GHz, and a power consumption under 200 mW mm$^{-1}$. We also show that the devices can be used to create flexible radiofrequency amplifiers with an output power of 64 mW mm$^{-1}$ and a 11 dB power gain in the K-band.
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