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Article: Two-Dimensional Cs2AgBiBr6/WS2 Heterostructure-Based Photodetector with Boosted Detectivity via Interfacial Engineering

TitleTwo-Dimensional Cs2AgBiBr6/WS2 Heterostructure-Based Photodetector with Boosted Detectivity via Interfacial Engineering
Authors
Keywords2D perovskites
heterostructure photodetector
interfacial engineering
scanning photocurrent mapping
tungsten disulfide
Issue Date2022
Citation
ACS Nano, 2022, v. 16 n. 3, p. 3985-3993 How to Cite?
AbstractTwo-dimensional (2D) transition metal dichalcogenide (TMDC) monolayers have been widely used for optoelectronic devices because of their ultrasensitivity to light detection acquired from their direct gap properties. However, the small cross-section of photon absorption in the atomically thin layer thickness significantly limits the generation of photocarriers, restricting their performance. Here, we integrate monolayer WS2with 2D perovskites Cs2AgBiBr6, which serve as the light absorption layer, to greatly enhance the photosensitivity of WS2. The efficient charge transfer at the Cs2AgBiBr6/WS2heterojunction is evidenced by the shortened photoluminescence (PL) decay time of Cs2AgBiBr6. Scanning photocurrent microscopy of Cs2AgBiBr6/WS2/graphene reveals that improved charge extraction from graphene leads to an enhanced photoresponse. The 2D Cs2AgBiBr6/WS2/graphene vertical heterostructure photodetector exhibits a high detectivity (D*) of 1.5 × 1013Jones with a fast response time of 52.3 μs/53.6 μs and an on/off ratio of 1.02 × 104. It is worth noting that this 2D heterostructure photodetector can realize self-powered light detection behavior with an open-circuit voltage of ∼0.75 V. The results suggest that the 2D perovskites can effectively improve the TMDC layer-based photodetectors for low-power consumption photoelectrical applications.
Persistent Identifierhttp://hdl.handle.net/10722/315521
ISSN
2023 Impact Factor: 15.8
2023 SCImago Journal Rankings: 4.593
ISI Accession Number ID

 

DC FieldValueLanguage
dc.contributor.authorFang, F-
dc.contributor.authorWan, Y-
dc.contributor.authorLi, H-
dc.contributor.authorFang, S-
dc.contributor.authorHuang, F-
dc.contributor.authorZhou, B-
dc.contributor.authorJiang, K-
dc.contributor.authorTung, V-
dc.contributor.authorLi, L-
dc.contributor.authorShi, Y-
dc.date.accessioned2022-08-19T08:59:27Z-
dc.date.available2022-08-19T08:59:27Z-
dc.date.issued2022-
dc.identifier.citationACS Nano, 2022, v. 16 n. 3, p. 3985-3993-
dc.identifier.issn1936-0851-
dc.identifier.urihttp://hdl.handle.net/10722/315521-
dc.description.abstractTwo-dimensional (2D) transition metal dichalcogenide (TMDC) monolayers have been widely used for optoelectronic devices because of their ultrasensitivity to light detection acquired from their direct gap properties. However, the small cross-section of photon absorption in the atomically thin layer thickness significantly limits the generation of photocarriers, restricting their performance. Here, we integrate monolayer WS2with 2D perovskites Cs2AgBiBr6, which serve as the light absorption layer, to greatly enhance the photosensitivity of WS2. The efficient charge transfer at the Cs2AgBiBr6/WS2heterojunction is evidenced by the shortened photoluminescence (PL) decay time of Cs2AgBiBr6. Scanning photocurrent microscopy of Cs2AgBiBr6/WS2/graphene reveals that improved charge extraction from graphene leads to an enhanced photoresponse. The 2D Cs2AgBiBr6/WS2/graphene vertical heterostructure photodetector exhibits a high detectivity (D*) of 1.5 × 1013Jones with a fast response time of 52.3 μs/53.6 μs and an on/off ratio of 1.02 × 104. It is worth noting that this 2D heterostructure photodetector can realize self-powered light detection behavior with an open-circuit voltage of ∼0.75 V. The results suggest that the 2D perovskites can effectively improve the TMDC layer-based photodetectors for low-power consumption photoelectrical applications.-
dc.languageeng-
dc.relation.ispartofACS Nano-
dc.subject2D perovskites-
dc.subjectheterostructure photodetector-
dc.subjectinterfacial engineering-
dc.subjectscanning photocurrent mapping-
dc.subjecttungsten disulfide-
dc.titleTwo-Dimensional Cs2AgBiBr6/WS2 Heterostructure-Based Photodetector with Boosted Detectivity via Interfacial Engineering-
dc.typeArticle-
dc.identifier.emailLi, L: lanceli1@hku.hk-
dc.identifier.emailLi, L: lanceli1@hku.hk-
dc.identifier.authorityLi, L=rp02799-
dc.identifier.authorityLi, L=rp02799-
dc.identifier.doi10.1021/acsnano.1c09513-
dc.identifier.scopuseid_2-s2.0-85125408279-
dc.identifier.hkuros335496-
dc.identifier.volume16-
dc.identifier.issue3-
dc.identifier.spage3985-
dc.identifier.epage3993-
dc.identifier.isiWOS:000780214300049-

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