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Nano Research

Article Title

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

Authors

Minliang Lai, Department of Chemistry, University of California, Berkeley, California 94720, USA
Qiao Kong, Department of Chemistry, University of California, Berkeley, California 94720, USA
Connor G. Bischak, Department of Chemistry, University of California, Berkeley, California 94720, USA
Yi Yu, Department of Chemistry, University of California, Berkeley, California 94720, USA Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA
Letian Dou, Department of Chemistry, University of California, Berkeley, California 94720, USA Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA
Samuel W. Eaton, Department of Chemistry, University of California, Berkeley, California 94720, USA
Naomi S. Ginsberg, Department of Chemistry, University of California, Berkeley, California 94720, USA Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA Kavli Energy Nanosciences Institute, Berkeley, California 94720, USA Molecular Biophysics and Integrative Bioimaging Division, Lawrence Berkeley National Laboratory, Berkeley, alifornia 94720, USA Department of Physics, University of California, Berkeley, California 94720, USA
Peidong Yang, Department of Chemistry, University of California, Berkeley, California 94720, USA Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA Kavli Energy Nanosciences Institute, Berkeley, California 94720, USA Department of Materials Science and Engineering, University of California, Berkeley, California 94720, USA

Keywords

inorganic halide perovskite, CsPbI3, phase transition, stability

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.

Graphical Abstract

Publisher

Tsinghua University Press

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