Photocurrent enhancement of CVD MoS2 photodetector via nanoplasmonics

Gustavo A. Saenz; Carlos F. de Anda Orea; Avra S. Bandyopadhyay; Anupama B. Kaul

doi:10.1117/12.2518985

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13 May 2019 Photocurrent enhancement of CVD MoS₂ photodetector via nanoplasmonics

Gustavo A. Saenz, Carlos F. de Anda Orea, Avra S. Bandyopadhyay, Anupama B. Kaul

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Proceedings Volume 10980, Image Sensing Technologies: Materials, Devices, Systems, and Applications VI; 1098019 (2019) https://doi.org/10.1117/12.2518985
Event: SPIE Defense + Commercial Sensing, 2019, Baltimore, Maryland, United States

Abstract

Broadband photodetection is crucial for various defense and scientific applications such as biomedical imaging, communications, and environmental and spectral monitoring. In recent years, transition metal dichalcogenide semiconductors, from the two-dimensional layered materials family, have attracted special attention for their application in photodetection due to their outstanding optoelectronic properties and large optical absorbance for their atomically thin thicknesses. Here, we present a CVD-synthesized MoS₂ phototransistor with Au/Ti contacts enhanced by Au nanoparticles via surface nanoplasmonics. From electronic and optoelectronic characterizations, intrinsic device parameters were extracted and analyzed including the field-effect mobility of 37.4 cm²V^-1s^-1, a high ON/OFF ratio of 10⁶. Next, the optoelectronic characterization was carried out before and after Au nanoparticles using a tunable laser with a wavelength absorption range from 400 nm to 1100 nm under vacuum conditions. The spectral photoresponse was improved from a cutoff wavelength of ~ 975 nm before the Au nanoparticles to a broadband spectral detection with a minimum standard deviation of 0.56 μA at from near-ultraviolet to near-infrared and a maximum photocurrent of 7.61 μA at an incident optical power density of ~ 2 μWcm^-2. In addition, the photocurrent has been increased 5-fold after decorating the MoS₂ photodetector with Au nanoparticles. The improvement of the light-matter interaction of MoS₂ nanosheet, described before, is attributed to the localized surface plasmon in gold nanoparticles.

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Gustavo A. Saenz, Carlos F. de Anda Orea, Avra S. Bandyopadhyay, and Anupama B. Kaul "Photocurrent enhancement of CVD MoS₂ photodetector via nanoplasmonics", Proc. SPIE 10980, Image Sensing Technologies: Materials, Devices, Systems, and Applications VI, 1098019 (13 May 2019); https://doi.org/10.1117/12.2518985

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