Structural, optical, and electrical properties of phase- controlled cesium lead iodide nanowires

Cesium lead iodide （CsPbIa）, 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...

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Bibliographic Details
Published in:Nano research 2017-04, Vol.10 (4), p.1107-1114
Main Authors: Lai, Minliang, Kong, Qiao, Bischak, Connor G., Yu, Yi, Dou, Letian, Eaton, Samuel W., Ginsberg, Naomi S., Yang, Peidong
Format: Article
Language:English
Subjects:
Atomic/Molecular Structure and Spectra
Biomedicine
Biotechnology
Cesium
Chemistry and Materials Science
Condensed Matter Physics
CsPbI3
Electrical properties
Energy gap
Energy gaps (solid state)
inorganic halide perovskite
Iodides
Lead
MATERIALS SCIENCE
Nanostructure
Nanotechnology
Nanowires
Optical properties
Optoelectronic devices
Perovskites
phase transition
Phase transitions
Photoluminescence
Photonic band gaps
Photons
Photoresponse
Photovoltaics
Quantum efficiency
Research Article
stability
Temperature
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Summary:Cesium lead iodide （CsPbIa）, 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 CsPbIa 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.
ISSN:1998-0124
1998-0000
DOI:10.1007/s12274-016-1415-0