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Research Article

Structural, optical, and electrical properties of phasecontrolled cesium lead iodide nanowires

Minliang Lai1, Qiao Kong1, Connor G. Bischak1, Yi Yu1,2, Letian Dou1,2, Samuel W. Eaton1, Naomi S. Ginsberg1,2,3,4,5, Peidong Yang1,2,3,6( )
Department of ChemistryUniversity of CaliforniaBerkeleyCalifornia94720USA
Materials Sciences DivisionLawrence Berkeley National LaboratoryBerkeleyCalifornia94720USA
Kavli Energy Nanosciences InstituteBerkeleyCalifornia94720USA
Molecular Biophysics and Integrative Bioimaging DivisionLawrence Berkeley National LaboratoryBerkeleyCalifornia94720USA
Department of PhysicsUniversity of CaliforniaBerkeleyCalifornia94720USA
Department of Materials Science and EngineeringUniversity of CaliforniaBerkeleyCalifornia94720USA
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Graphical Abstract

Abstract

Cesium lead iodide (CsPbI3), in its black perovskite phase, has a suitable bandgap and high quantum efficiency for photovoltaic applications. However, CsPbI3 tends to crystalize into a yellow non-perovskite phase, which has poor optoelectronic properties, at room temperature. Therefore, controlling the phase transition in CsPbI3 is critical for practical application of this material. Here we report a systematic study of the phase transition of one-dimensional CsPbI3 nanowires and their corresponding structural, optical, and electrical properties. We show the formation of perovskite black phase CsPbI3 nanowires from the non-perovskite yellow phase through rapid thermal quenching. Post-transformed black phase CsPbI3 nanowires exhibit increased photoluminescence emission intensity with a shrinking of the bandgap from 2.78 to 1.76 eV. The perovskite nanowires were photoconductive and showed a fast photoresponse and excellent stability at room temperature. These promising optical and electrical properties make the perovskite CsPbI3 nanowires attractive for a variety of nanoscale optoelectronic devices.

Keywords

inorganic halide perovskiteCsPbI3phase transitionstability

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Nano Research
Volume 10 Issue 4,
April 2017
Pages 1107-1114
DOI: 10.1007/s12274-016-1415-0
Cite this article:
Lai M, Kong Q, Bischak CG, et al. Structural, optical, and electrical properties of phasecontrolled cesium lead iodide nanowires. Nano Research, 2017, 10(4): 1107-1114. https://doi.org/10.1007/s12274-016-1415-0
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Received: 07 November 2016
Revised: 10 December 2016
Accepted: 12 December 2016
Published: 20 February 2017
© Tsinghua University Press and Springer-Verlag Berlin Heidelberg 2016
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