Ultrathin Colloidal Cesium Lead Halide Perovskite Nanowires

Zhang, Dandan; Yu, Yi; Bekenstein, Yehonadav; Wong, Andrew B.; Alivisatos, A. Paul; Yang, Peidong

doi:10.1021/jacs.6b08373

Title: Ultrathin Colloidal Cesium Lead Halide Perovskite Nanowires

Journal Article · 27 September 2016 · Journal of the American Chemical Society

DOI: https://doi.org/10.1021/jacs.6b08373 · OSTI ID:1532203

Zhang, Dandan ^[1]; Yu, Yi ^[1]; Bekenstein, Yehonadav ^[2]; Wong, Andrew B. ^[1]; Alivisatos, A. Paul ^[2]; Yang, Peidong ^[2]

Univ. of California, Berkeley, CA (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Univ. of California, Berkeley, CA (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); Kavli Energy NanoScience Institute, Berkeley, CA (United States)

Highly uniform single crystal ultrathin CsPbBr₃ nanowires (NWs) with diameter of 2.2 ± 0.2 nm and length up to several microns were successfully synthesized and purified using a catalyst-free colloidal synthesis method followed by a stepwise purification strategy. The NWs have bright photoluminescence (PL) with a photoluminescence quantum yield (PLQY) of about 30% after surface treatment. Large blue-shifted UV-vis absorption and PL spectra have been observed due to strong two-dimensional quantum confinement effects. A small angle X-ray scattering (SAXS) pattern shows the periodic packing of the ultrathin NWs along the radial direction, demonstrates the narrow radial distribution of the wires, and emphasizes the deep intercalation of the surfactants. Despite the extreme aspect ratios of the ultrathin NWs, their composition and the resulting optical properties can be readily tuned by an anion-exchange reaction with good morphology preservation. Furthermore, these bright ultrathin NWs may be used as a model system to study strong quantum confinement effects in a one-dimensional halide perovskite system.

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Research Organization:: Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)

Grant/Contract Number:: AC02-05CH11231

OSTI ID:: 1532203

Journal Information:: Journal of the American Chemical Society, Journal Name: Journal of the American Chemical Society Journal Issue: 40 Vol. 138; ISSN 0002-7863

Publisher:: American Chemical Society (ACS)Copyright Statement

Country of Publication:: United States

Language:: English

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