Room temperature long-wavelength infrared graphene photodetectors using photogating via the pyroelectric effect

Masaaki Shimatani; Shoichiro Fukushima; Satoshi Okuda; Shinpei Ogawa; Yasushi Kanai; Takao Ono; Koichi Inoue; Kazuhiko Matsumoto

doi:10.1117/12.2558343

23 April 2020 Room temperature long-wavelength infrared graphene photodetectors using photogating via the pyroelectric effect

Masaaki Shimatani, Shoichiro Fukushima, Satoshi Okuda, Shinpei Ogawa, Yasushi Kanai, Takao Ono, Koichi Inoue, Kazuhiko Matsumoto

Author Affiliations +

Proceedings Volume 11407, Infrared Technology and Applications XLVI; 1140717 (2020) https://doi.org/10.1117/12.2558343
Event: SPIE Defense + Commercial Sensing, 2020, Online Only

Abstract

Graphene has unique optoelectronic properties and potential applications in improved infrared (IR) photodetectors. Due to its Dirac cone structure, graphene exhibits broadband light absorption and rapid responsivity. In addition, unlike conventional quantum photomaterials, graphene can be synthesized inexpensively via a non-toxic process. Although graphene has advantages in IR photodetector applications, graphene photodetectors have shown low responsivity due to their minimal IR absorption (just 2.3%) and also require cooling. Therefore, there is considerable interest in enhancing the responsivity of graphene photodetectors operating at room temperature so that their advantages can be employed in IR applications. The present work demonstrates room temperature, high-responsivity, long-wavelength infrared (LWIR) graphene photodetectors. These devices operate on the photogating effect, using a lithium niobate (LiNbO₃) substrate with enhancement of the photogating via a pyroelectric effect in the substrate in conjunction with a SiN layer. This effect significantly modulates the back-gate voltage to increase the photoresponse by a factor of approximately 600 compared to that for a conventional graphene photodetector. This work also found a change in the type of charge carrier with variations in temperature, which was attributed to a large shift in the Dirac point owing to the strong photogating effect. The results of this study are expected to contribute to the future realization of high-responsivity, low-cost LWIR photodetectors for applications such as thermal imaging, medical care and gas analysis.

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Masaaki Shimatani, Shoichiro Fukushima, Satoshi Okuda, Shinpei Ogawa, Yasushi Kanai, Takao Ono, Koichi Inoue, and Kazuhiko Matsumoto "Room temperature long-wavelength infrared graphene photodetectors using photogating via the pyroelectric effect", Proc. SPIE 11407, Infrared Technology and Applications XLVI, 1140717 (23 April 2020); https://doi.org/10.1117/12.2558343

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KEYWORDS

Graphene

Photodetectors

Sensors

Long wavelength infrared

Infrared sensors

Pyroelectric detectors

Pyroelectricity

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