Improve the stability of organic-inorganic hybrid perovskite by vapor-solid reaction

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dc.contributor Bao, Yuping
dc.contributor Huang, Qiang
dc.contributor Yan, Feng
dc.contributor Gupta, Arunava
dc.contributor.advisor Peng, Qing
dc.contributor.author Yu, Xiaozhou
dc.date.accessioned 2019-08-01T14:23:50Z
dc.date.available 2019-08-01T14:23:50Z
dc.date.issued 2019
dc.identifier.other u0015_0000001_0003293
dc.identifier.other Yu_alatus_0004D_13852
dc.identifier.uri http://ir.ua.edu/handle/123456789/6106
dc.description Electronic Thesis or Dissertation
dc.description.abstract Abstract Organic-inorganic hybrid perovskites, such as CH3NH3PbI3 and NH2CH=NH2PbI3, emerge as a new class of low-cost semiconductors that have the potential applications in high-efficiency photovoltaic cells, light emitting diodes, lasers, and sensors. However, hybrid perovskites can be easily degraded by H2O, O2, and light in ambient conditions. To improve the stability of hybrid perovskites, we carried out a comprehensive study including the degradation kinetics and surface modification by vapor-solid reactions for encapsulation. The degradation kinetics of perovskites were studied by using in situ methods. We found CH3NH3PbI3 perovskite degrades slowly at 85°C. This result indicates hybrid perovskites alone is not stable in the working conditions. We enhanced the stability of perovskites by surface modification through studying the surface reaction mechanism on perovskites. We found that by increasing the partial pressure of vapor reactants such as pyridine, the vapor-perovskite reactions will change from surface terminated reaction to bulk transformation reactions. A thin pin-hole free oxide barrier layer cannot only block H2O and O2 from meeting perovskites but also encapsulate the gas byproducts from the degradation reactions to stop the reversible degradation reaction. Atomic layer deposition (ALD) is a promising method to deposit a pinhole-free metal oxide barrier film onto perovskites. Although there are numerous reports in applying ALD on hybrid perovskites, the nucleation mechanism of ALD on these perovskites are poorly understood. Herein, we will present our findings about the atomic level surface reaction mechanism during ALD on perovskite-related substrates. Collectively, we are able to create a couple of new pathways to improve the stability of perovskite materials.
dc.format.extent 152 p.
dc.format.medium electronic
dc.format.mimetype application/pdf
dc.language English
dc.language.iso en_US
dc.publisher University of Alabama Libraries
dc.relation.ispartof The University of Alabama Electronic Theses and Dissertations
dc.relation.ispartof The University of Alabama Libraries Digital Collections
dc.relation.hasversion born digital
dc.rights All rights reserved by the author unless otherwise indicated.
dc.subject.other Chemical engineering
dc.title Improve the stability of organic-inorganic hybrid perovskite by vapor-solid reaction
dc.type thesis
dc.type text
etdms.degree.department University of Alabama. Department of Chemical and Biological Engineering
etdms.degree.discipline Chemical & Biological Engineering
etdms.degree.grantor The University of Alabama
etdms.degree.level doctoral
etdms.degree.name Ph.D.


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