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arXiv · 2308.14750

Ultrahigh Photoresponsivity of Gold Nanodisk Array/CVD MoS$_2$-based Hybrid Phototransistor

Shyam Narayan Singh Yadav·Po-Liang Chen·Yu-Chi Yao·Yen-Yu Wang·Der-Hsien Lien·Yu-Jung Lu·Ya-Ping Hsieh·Chang-Hua Liu·Ta-Jen Yen
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Abstract

Owing to its atomically thin thickness, layer-dependent tunable band gap, flexibility, and CMOS compatibility, MoS$_2$ is a promising candidate for photodetection. However, mono-layer MoS2-based photodetectors typically show poor optoelectronic performances, mainly limited by their low optical absorption. In this work, we hybridized CVD-grown monolayer MoS$_2$ with a gold nanodisk (AuND) array to demonstrate a superior visible photodetector through a synergetic effect. It is evident from our experimental results that there is a strong light-matter interaction between AuNDs and monolayer MoS$_2$, which results in better photodetection due to a surface trap state passivation with a longer charge carrier lifetime compared to pristine MoS$_2$. In particular, the AuND/MoS$_2$ system demonstrated a photoresponsivity of $8.7 \times 10^{4}$ A/W, specific detectivity of $6.9 \times 10^{13}$ Jones, and gain $1.7 \times 10^{5}$ at $31.84 \mu W/cm^{2}$ illumination power density of 632 nm wavelength with an applied voltage of 4.0 V for an AuND/MoS$_2$-based photodetector. To our knowledge, these optoelectronic responses are one order higher than reported results for CVD MoS$_2$-based photodetector in the literature.

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Shyam Narayan Singh Yadav, Po-Liang Chen, Yu-Chi Yao, Yen-Yu Wang, Der-Hsien Lien, Yu-Jung Lu, Ya-Ping Hsieh, Chang-Hua Liu, Ta-Jen Yen. 2023-08-28. Ultrahigh Photoresponsivity of Gold Nanodisk Array/CVD MoS$_2$-based Hybrid Phototransistor. https://arxiv.org/abs/2308.14750

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