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Lead sulfide quantum dots （PbS QDs） have excellent optoelectronic properties and strong near-infrared light absorption，making them ideal materials for the preparation of near-infrared photodetectors. However，there are still challenges in the process and insufficient performance of the PbS QDs-based optoelectronic detection. In this study，PbS QDs are synthesized by the hot injection method，and the PbS quantum junction infrared detector is prepared by the layer-by-layer method and the solid-state ligand exchange method. The photoelectric performance of the PbS quantum junction infrared detector is improved by the thermal annealing process，and the effect of annealing temperature on the photoelectric performance of the PbS quantum junction is described. The results show that annealing effectively reduces the dark current of the PbS quantum junction infrared detector while increasing the photocurrent，and obtains a stable photoresponse current output. After annealing，the response time of the PbS quantum junction infrared detector is shortened，resulting in a time of 1.9 ms and a delay time of 3.2 ms. The sensitivity of the detector is improved，and the responsivity and detectivity are increased by 1.2 times and 1.3 times，respectively，resulting in a responsivity of 0.78 A·W-1 and a detectivity of . Annealing effectively improves the crystallinity and the carrier mobility of PbS QDs thin films，while reducing the defect states at the film and interface，resulting in a comprehensive improvement in the optoelectronic performance of PbS quantum junction infrared detectors.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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