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- W4367182321 abstract "Two-dimensional (2D) materials are being intensively exploited for broadband-responsive photodetectors (PDs). However, the broadband-responsive PDs based on 2D materials normally suffer from poor response to infrared wavelengths. Here, we report the excellent photoresponse performance of vertical PtSe2/ultrathin Al2O3/Ge PD under near-infrared illumination. We directly selenize Pt film deposited on Al2O3/Ge to form PtSe2 layer. The ultrathin Al2O3 passivation layer plays the role of surface modification, effectively weakening recombination of the photogenerated carriers. Under 1550-nm illumination, the PtSe2/ultrathin Al2O3/Ge PD with a working area of 50 µm × 50 µm at zero bias obtains a large responsivity of 4.09 A W−1, and fast rise/fall times of 32.6/18.9 µs, respectively. And under an external electric field of −5 V, the responsivity and response speed of the PtSe2/ultrathin Al2O3/Ge PD can be as high as 38.18 A W−1 and as fast as 9.6/7.7 µs, respectively. We find that the working area has a great influence on the photoresponse characteristics. Furthermore, we demonstrate the PtSe2/ultrathin Al2O3/Ge PDs array shows outstanding violet, visible, and infrared imaging capability at room temperature. Our study suggests that the PtSe2/ultrathin Al2O3/Ge heterojunction has great application prospects for the design of emerging broadband optoelectronic devices with superior performance for near-infrared response." @default.
- W4367182321 created "2023-04-28" @default.
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- W4367182321 date "2023-04-20" @default.
- W4367182321 modified "2023-10-16" @default.
- W4367182321 title "具有超薄Al2O3钝化层的高性能近红外PtSe2/n-Ge异质结光电探测器" @default.
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- W4367182321 doi "https://doi.org/10.1007/s40843-022-2402-3" @default.
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