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Lead-Free Cs2BiAgBr6 Double Perovskite-Based Humidity Sensor with Superfast Recovery Time
Fudan Univ, Ctr Micronano Syst, Shanghai 200433, Peoples R China..ORCID iD: 0000-0003-1970-0392
Fudan Univ, Ctr Micronano Syst, Shanghai 200433, Peoples R China.;Fudan Univ, Minist Educ, Key Lab Micro & Nano Photon Struct, State Key Lab Surface Phys, Shanghai 200433, Peoples R China.;Fudan Univ, Collaborat Innovat Ctr Adv Microstruct, Shanghai 200433, Peoples R China..
Fudan Univ, Ctr Micronano Syst, Shanghai 200433, Peoples R China.;Univ Kebangsaan Malaysia, Inst Microengn & Nanoelect, Bangi 43600, Selangor, Malaysia..ORCID iD: 0000-0001-8299-4827
Fudan Univ, Ctr Micronano Syst, Shanghai 200433, Peoples R China..
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2019 (English)In: Advanced Functional Materials, ISSN 1616-301X, E-ISSN 1616-3028, Vol. 29, no 24, article id 1902234Article in journal (Refereed) Published
Abstract [en]

Lead halide perovskites have demonstrated outstanding achievements in photoelectric applications owing to their unique properties. However, the moisture sensitivity of lead halide perovskite has rarely been developed into an applicable humidity sensor due to the intrinsic instability and toxicity issue. Herein, as a highly stable lead-free perovskite, a Cs2BiAgBr6 thin film is chosen to be the active material for humidity sensor due to its extraordinary humidity-dependent electrical properties and good stability. This Cs2BiAgBr6 thin film humidity sensor demonstrates a superfast response time (1.78 s) and recovery time (0.45 s). The superfast response and recovery properties can be attributed to the reversible physisorption of water molecules, which can be easily adsorbed onto or desorbed from the thin film surface. Moreover, the sensor also shows an excellent reliability and stability properties as well as logarithmic linearity in a relative humidity's range of 15% to 78%. The lead-free Cs2BiAgBr6 perovskite possesses great potential for application in real-time humidity sensing.

Place, publisher, year, edition, pages
WILEY-V C H VERLAG GMBH , 2019. Vol. 29, no 24, article id 1902234
Keywords [en]
Cs2BiAgBr6, humidity sensor, lead-free perovskite, superfast recovery
National Category
Materials Engineering
Identifiers
URN: urn:nbn:se:kth:diva-270671DOI: 10.1002/adfm.201902234ISI: 000471074000019Scopus ID: 2-s2.0-85064525066OAI: oai:DiVA.org:kth-270671DiVA, id: diva2:1413980
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QC 20200311

Available from: 2020-03-11 Created: 2020-03-11 Last updated: 2020-03-11Bibliographically approved

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Zheng, Li-rong

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