In:
Journal of Materials Chemistry C, Royal Society of Chemistry (RSC), Vol. 10, No. 6 ( 2022), p. 2049-2059
Kurzfassung:
Self-powered photodetectors with excellent figures-of-merit, fast response speed, and broadband detection capability have drawn tremendous research interest. However, it is still challenging to develop excellent light-absorbing materials as photodetectors with effective separation of carriers. In this paper, we develop a SnO 2 nano litchi shell structure/n-Si heterojunction with enhanced broadband light absorption for self-powered photodetection. The advantageous photoresponse performance of the SnO 2 nano litchi shell structure/n-Si heterojunction is attributed to the following factors: (1) the SnO 2 nano litchi shell structure has a large specific surface area to trap light; (2) the spherical cavity structure increases the light utilization rate by scattering and multiple reflections; (3) the significant Fermi energy difference at the junction of the SnO 2 layer and Si layer. As a result, the device exhibits a broadband detection capacity from ultraviolet (365 nm) to near-infrared (980 nm) at 0 voltage. Under 900 nm (10 μW cm −2 ), the photodetector shows the responsivity of 0.033 A W −1 , the photosensitivity of 8.35 × 10 8 cm 2 W −1 , the detectivity of 2.94 × 10 12 Jones, the response time of 20.8 μs, and the recovery time of 285 μs. We also evaluated the near-infrared low signal imaging and fluorescence detection capability of the device. We expect that the SnO 2 nano litchi shell structure/n-Si heterojunction photodetector will have great potential in biomedical and environmental monitoring, and military reconnaissance.
Materialart:
Online-Ressource
ISSN:
2050-7526
,
2050-7534
Sprache:
Englisch
Verlag:
Royal Society of Chemistry (RSC)
Publikationsdatum:
2022
ZDB Id:
2702245-6
