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Defining the composition and electronic structure of large-scale and single-crystalline like Cs 2 AgBiBr 6 films fabricated by capillary-assisted dip-coating method
Jingwei Xiu1; Yangfan Shao2,3; Linxun Chen1; Yue Feng2; Junfeng Dai2; Xusheng Zhang1; Yi Lin1; Yudong Zhu1; Zhenggang Wu1; Yini Zheng1; Hui Pan3; Chang Liu2; Xingqiang Shi2; Xin Cheng1; Zhubing He1
2019-06
Source PublicationMaterials Today Energy
ISSN2468-6069
Volume12Pages:186-197
Abstract

Owning the merits of both lead-free and air-stable, the double-perovskite Cs2AgBiBr6 has attracted increasing attention, but suffers low visible-light absorption coefficient due to its large indirect bandgap. Moreover, the electronic structure of its synthesized films has not been explored clearly yet. In this work, we developed a general and promising method to fabricate continuous, uniform and highly orientated Cs2AgBiBr6 films in large scale on various substrates through capillary-assisted dip-coating method. Strikingly, those optimized films are single crystalline verified by φ-scan XRD. Its electronic structure was carefully studied independently by multi-photo-physical characterizations. Its bandgap can be tuned from 2.65 to 2.25 eV by changing the substrate temperature in growth from 40 to 160 °C. Essentially, their work-function (WF) was determined at −5.01 eV and WF-VBM is around 2 eV. This novel band structure with typical n-type characteristic, was further confirmed by DFT calculations, which reveals that the Cs interstitials and Br vacancies derived deep defect levels were fixed around its Fermi level, closer to the conduction band. This conclusion is different from its widely accepted p-type feature, but definitely deepens our understanding of this material and inspires us to find more valuable strategies of modulating its band structure and optoelectronic properties.

KeywordSingle-crystalline Perovskite Films
DOI10.1016/j.mtener.2019.01.010
URLView the original
Indexed BySCIE
Language英語English
WOS Research AreaChemistry ; Materials Science ; Energy & Fuels
WOS SubjectChemistry, Physical ; Energy & Fuels ; Materials Science, Multidisciplinary
WOS IDWOS:000480520000018
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Cited Times [WOS]:15   [WOS Record]     [Related Records in WOS]
Document TypeJournal article
CollectionUniversity of Macau
Corresponding AuthorHui Pan; Zhubing He
Affiliation1.Department of Materials Science and Engineering, Shenzhen Key Laboratory of Full Spectral Solar Electricity Generation (FSSEG), Southern University ofScience and Technology, No. 1088, Xueyuan Rd., Shenzhen, 518055, Guangdong, China
2.Department of Physics, Southern University of Science and Technology, No. 1088, Xueyuan Rd., Shenzhen, 518055, Guangdong, China
3.Institute of AppliedPhysics and Materials Engineering, University of Macau, Macau SAR, China
Corresponding Author AffilicationUniversity of Macau
Recommended Citation
GB/T 7714
Jingwei Xiu,Yangfan Shao,Linxun Chen,et al. Defining the composition and electronic structure of large-scale and single-crystalline like Cs 2 AgBiBr 6 films fabricated by capillary-assisted dip-coating method[J]. Materials Today Energy,2019,12:186-197.
APA Jingwei Xiu,Yangfan Shao,Linxun Chen,Yue Feng,Junfeng Dai,Xusheng Zhang,Yi Lin,Yudong Zhu,Zhenggang Wu,Yini Zheng,Hui Pan,Chang Liu,Xingqiang Shi,Xin Cheng,&Zhubing He.(2019).Defining the composition and electronic structure of large-scale and single-crystalline like Cs 2 AgBiBr 6 films fabricated by capillary-assisted dip-coating method.Materials Today Energy,12,186-197.
MLA Jingwei Xiu,et al."Defining the composition and electronic structure of large-scale and single-crystalline like Cs 2 AgBiBr 6 films fabricated by capillary-assisted dip-coating method".Materials Today Energy 12(2019):186-197.
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