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- W4297999182 abstract "Abstract Quantum dots (QDs) often exhibit unique behaviors because the reduction in lateral size leads to stronger quantum confinement effects and a higher surface-to-volume ratio in comparison with larger two-dimensional nanosheets. However, the preparation of homogeneous QDs remains a longstanding challenge. This work reports the preparation of high-yield and ultrasmall tin disulfide (SnS 2 ) QDs by combining top–down and bottom–up approaches. The as-prepared SnS 2 QDs have a uniform lateral size of 3.17 ± 0.62 nm and a thicknesses 2.39 ± 0.88 nm. A series of self-powered photoelectrochemical-type photodetectors (PDs) utilizing the SnS 2 QDs as photoelectrodes are also constructed. Taking advantage of the tunable bandgaps and high carrier mobility of the SnS 2 , our PDs achieve a high photocurrent density of 16.38 μA cm −2 and a photoresponsivity of 0.86 mA W −1 , and good long-term cycling stability. More importantly, the device can display obvious photoresponse, even at zero bias voltage (max), and greater weak-light sensitivity than previously reported SnS 2 -based PDs. Density functional theory calculation and optical absorption were employed to reveal the working mechanism of the SnS 2 QDs-based PDs. This study highlights the prospective applications of ultrasmall SnS 2 QDs and provides a new route towards future design of QDs-based optoelectronic devices." @default.
- W4297999182 created "2022-10-01" @default.
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- W4297999182 date "2022-09-29" @default.
- W4297999182 modified "2023-10-16" @default.
- W4297999182 title "Ultrasmall SnS<sub>2</sub> quantum dot−based photodetectors with high responsivity and detectivity" @default.
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- W4297999182 doi "https://doi.org/10.1515/nanoph-2022-0277" @default.
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