Structural, optical, and electrical properties of phase-controlled cesium lead iodide nanowires
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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.
Keywordsinorganic halide perovskite CsPbI3 phase transition stability
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This work was supported by the U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences, Materials Sciences and Engineering Division, under Contract No. DE-AC02-05-CH11231 within the Physical Chemistry of Inorganic Nanostructures Program (KC3103). Work at the NCEM, Molecular Foundry was supported by the Office of Science, Office of Basic Energy Science, of the U.S. Department of Energy under Contract No. DE-AC02-05CH11231. Minliang Lai and Qiao Kong thank Suzhou Industrial Park for the fellowship support. Connor G. Bischak acknowledges an NSF Graduate Research Fellowship (No. DGE1106400), and Naomi S. Ginsberg acknowledges a Packard Fellowship for Science and Engineering, a Camille Dreyfus Teacher-Scholar Award, and an Alfred P. Sloan Research Fellowship.
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