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Article: High Phase Stability in CsPbI3 Enabled by Pb–I Octahedra Anchors for Efficient Inorganic Perovskite Photovoltaics

TitleHigh Phase Stability in CsPbI3 Enabled by Pb–I Octahedra Anchors for Efficient Inorganic Perovskite Photovoltaics
Authors
KeywordsCsPbI3
defect density
inorganic perovskite
PbI6 octahedra anchors
phase stability
Issue Date2020
PublisherWiley - VCH Verlag GmbH & Co KGaA. The Journal's web site is located at http://www.wiley-vch.de/publish/en/journals/alphabeticIndex/2089
Citation
Advanced Materials, 2020, v. 32 n. 24, p. article no. 2000186 How to Cite?
AbstractCsPbI3 inorganic perovskite has exhibited some special properties particularly crystal structure distortion and quantum confinement effect, yet the poor phase stability of CsPbI3 severely hinders its applications. Herein, the nature of the photoactive CsPbI3 phase transition from the perspective of PbI6 octahedra is revealed. A facile method is also developed to stabilize the photoactive phase and to reduce the defect density of CsPbI3. CsPbI3 is decorated with multifunctional 4‐aminobenzoic acid (ABA), and steric neostigmine bromide (NGBr) is subsequently used to further mediate the thin films' surface (NGBr‐CsPbI3(ABA)). The ABA or NG cation adsorbed onto the grain boundaries/surface of CsPbI3 anchors the PbI6 octahedra via increasing the energy barriers of octahedral rotation, which maintains the continuous array of corner‐sharing PbI6 octahedra and kinetically stabilizes the photoactive phase CsPbI3. Moreover, the added ABA and NGBr not only interact with shallow‐ or deep‐level defects in CsPbI3 to significantly reduce defect density, but also lead to improved energy‐level alignment at the interfaces between the CsPbI3 and the charge transport layers. Finally, the champion NGBr‐CsPbI3(ABA)‐based inorganic perovskite solar cell delivers 18.27% efficiency with excellent stability. Overall, this work demonstrates a promising concept to achieve highly phase‐stabilized inorganic perovskite with suppressed defect density for promoting its optoelectronic applications.
Persistent Identifierhttp://hdl.handle.net/10722/288082
ISSN
2019 Impact Factor: 27.398
2015 SCImago Journal Rankings: 9.021

 

DC FieldValueLanguage
dc.contributor.authorWANG, Y-
dc.contributor.authorChen, G-
dc.contributor.authorOUYANG, D-
dc.contributor.authorHE, X-
dc.contributor.authorLI, C-
dc.contributor.authorMA, R-
dc.contributor.authorYin, WJ-
dc.contributor.authorChoy, WCH-
dc.date.accessioned2020-10-05T12:07:37Z-
dc.date.available2020-10-05T12:07:37Z-
dc.date.issued2020-
dc.identifier.citationAdvanced Materials, 2020, v. 32 n. 24, p. article no. 2000186-
dc.identifier.issn0935-9648-
dc.identifier.urihttp://hdl.handle.net/10722/288082-
dc.description.abstractCsPbI3 inorganic perovskite has exhibited some special properties particularly crystal structure distortion and quantum confinement effect, yet the poor phase stability of CsPbI3 severely hinders its applications. Herein, the nature of the photoactive CsPbI3 phase transition from the perspective of PbI6 octahedra is revealed. A facile method is also developed to stabilize the photoactive phase and to reduce the defect density of CsPbI3. CsPbI3 is decorated with multifunctional 4‐aminobenzoic acid (ABA), and steric neostigmine bromide (NGBr) is subsequently used to further mediate the thin films' surface (NGBr‐CsPbI3(ABA)). The ABA or NG cation adsorbed onto the grain boundaries/surface of CsPbI3 anchors the PbI6 octahedra via increasing the energy barriers of octahedral rotation, which maintains the continuous array of corner‐sharing PbI6 octahedra and kinetically stabilizes the photoactive phase CsPbI3. Moreover, the added ABA and NGBr not only interact with shallow‐ or deep‐level defects in CsPbI3 to significantly reduce defect density, but also lead to improved energy‐level alignment at the interfaces between the CsPbI3 and the charge transport layers. Finally, the champion NGBr‐CsPbI3(ABA)‐based inorganic perovskite solar cell delivers 18.27% efficiency with excellent stability. Overall, this work demonstrates a promising concept to achieve highly phase‐stabilized inorganic perovskite with suppressed defect density for promoting its optoelectronic applications.-
dc.languageeng-
dc.publisherWiley - VCH Verlag GmbH & Co KGaA. The Journal's web site is located at http://www.wiley-vch.de/publish/en/journals/alphabeticIndex/2089-
dc.relation.ispartofAdvanced Materials-
dc.rightsThis is the peer reviewed version of the following article: [FULL CITE], which has been published in final form at [Link to final article using the DOI]. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Use of Self-Archived Versions.-
dc.subjectCsPbI3-
dc.subjectdefect density-
dc.subjectinorganic perovskite-
dc.subjectPbI6 octahedra anchors-
dc.subjectphase stability-
dc.titleHigh Phase Stability in CsPbI3 Enabled by Pb–I Octahedra Anchors for Efficient Inorganic Perovskite Photovoltaics-
dc.typeArticle-
dc.identifier.emailChoy, WCH: chchoy@eee.hku.hk-
dc.identifier.authorityChoy, WCH=rp00218-
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.1002/adma.202000186-
dc.identifier.pmid32363655-
dc.identifier.scopuseid_2-s2.0-85084224034-
dc.identifier.hkuros315681-
dc.identifier.volume32-
dc.identifier.issue24-
dc.identifier.spagearticle no. 2000186-
dc.identifier.epagearticle no. 2000186-
dc.publisher.placeGermany-

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