Back to Search
Start Over
Ultrasmall SnS2 quantum dot−based photodetectors with high responsivity and detectivity.
- Source :
- Nanophotonics (21928606); Dec2022, Vol. 11 Issue 21, p4781-4792, 12p
- Publication Year :
- 2022
-
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<subscript>2</subscript>) QDs by combining top–down and bottom–up approaches. The as-prepared SnS<subscript>2</subscript> 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<subscript>2</subscript> QDs as photoelectrodes are also constructed. Taking advantage of the tunable bandgaps and high carrier mobility of the SnS<subscript>2</subscript>, our PDs achieve a high photocurrent density of 16.38 μA cm<superscript>−2</superscript> and a photoresponsivity of 0.86 mA W<superscript>−1</superscript>, 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<subscript>2</subscript>-based PDs. Density functional theory calculation and optical absorption were employed to reveal the working mechanism of the SnS<subscript>2</subscript> QDs-based PDs. This study highlights the prospective applications of ultrasmall SnS<subscript>2</subscript> QDs and provides a new route towards future design of QDs-based optoelectronic devices. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 21928606
- Volume :
- 11
- Issue :
- 21
- Database :
- Complementary Index
- Journal :
- Nanophotonics (21928606)
- Publication Type :
- Academic Journal
- Accession number :
- 160508109
- Full Text :
- https://doi.org/10.1515/nanoph-2022-0277