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Ultrahigh Performance UV Photodetector by Inserting an Al 2 O 3 Nanolayer in NiO/n‐Si

Ultraviolet (UV) photodetectors have gained much attention due to their numerous important applications ranging from environmental monitoring to space communication. To date, most p‐NiO/n‐Si heterojunction photodetectors (HPDs) exhibit poor UV responsivity and slow response. This is mainly due to a...

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Bibliographic Details
Published in:Advanced electronic materials 2024-09, Vol.10 (9)
Main Authors: Ma, Xingzhao, Tang, Libin, Jia, Menghan, Zhang, Yuping, Zuo, Wenbin, Cai, Yuhua, Li, Rui, Yang, Liqing, Teng, Kar Seng
Format: Article
Language:English
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Summary:Ultraviolet (UV) photodetectors have gained much attention due to their numerous important applications ranging from environmental monitoring to space communication. To date, most p‐NiO/n‐Si heterojunction photodetectors (HPDs) exhibit poor UV responsivity and slow response. This is mainly due to a small valence band offset (Δ E V ) at the NiO/Si interface and a high density of dangling bonds at the silicon surface. Herein, an UV HPD consisting of NiO/Al 2 O 3 /n‐Si is fabricated using magnetron sputtering technique. The HPD has a large rectification ratio of 2.4 × 10 5 . It also exhibits excellent UV responsivity ( R ) of 15.8 A/W at −5 V and and detectivity ( D* ) of 1.14 × 10 13 Jones at −4 V, respectively. The excellent performance of the HPD can be attributed to the defect passivation at the interfaces of the heterojunction and the efficient separation of photogenerated carriers by the Al 2 O 3 nanolayer. The external quantum efficiency ( EQE ) of the HPD as high as 5.4 × 10 3 %, hence implying a large optical gain due to carrier proliferation resulting from impact ionization. Furthermore, the ultrafast response speed with a rise time of 80 µs and a decay time of 184 µs are obtained.
ISSN:2199-160X
2199-160X
DOI:10.1002/aelm.202300909