Towards to the development of THz detectors based on carbon nanostructuresстатья Исследовательская статья

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1. Полный текст Gayduchenko_2018_J._Phys.3A_Conf._Ser._1092_012039.pdf 917,0 КБ 5 ноября 2018 [Obraztsova]

[1] Towards to the development of thz detectors based on carbon nanostructures / I. Gayduchenko, G. Fedorov, N. Titova et al. // Journal of Physics: Conference Series. — 2018. — Vol. 1092. — P. 012039–1–012039–4. Demand for efficient terahertz radiation detectors resulted in intensive study of the carbon nanostructures as possible solution for that problem. In this work we investigate the response to sub-terahertz radiation of detectors with sensor elements based on CVD graphene as well as its derivatives – carbon nanotubes (CNTs). The devices are made in configuration of field effect transistors (FET) with asymmetric source and drain (vanadium and gold) contacts and operate as lateral Schottky diodes. We show that at 300K semiconducting CNTs show better performance up to 300GHz with responsivity up to 100V/W, while quasi-metallic CNTs are shown to operate up to 2.5THz. At 300 K graphene detector exhibit the room-temperature responsivity from R = 15 V/W at f= 129 GHz to R = 3 V/W at f = 450 GHz. We find that at low temperatures (77K) the graphene lateral Schottky diodes responsivity rises with the increasing frequency of the incident sub-THz radiation. We interpret this result as a manifestation of a plasmonic effect in the devices with the relatively long plasmonic wavelengths. The obtained data allows for determination of the most promising directions of development of the technology of nanocarbon structures for the detection of THz radiation. [ DOI ]

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