Ultrathin Colloidal Cesium Lead Halide Perovskite Nanowires.
Highly uniform single crystal ultrathin CsPbBr3nanowires (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. These bright ultrathin NWs may be used as a model system to study strong quantum confinement effects in a one-dimensional halide perovskite system.
Materials Sciences Division, Lawrence Berkeley National Laboratory , Berkeley, California 94720, United States.
Dandan
D
Zhang
Materials Sciences Division, Lawrence Berkeley National Laboratory , Berkeley, California 94720, United States.
Yi
Y
Yu
Materials Sciences Division, Lawrence Berkeley National Laboratory , Berkeley, California 94720, United States.|Kavli Energy NanoScience Institute , Berkeley, California 94720, United States.
Yehonadav
Y
Bekenstein
Materials Sciences Division, Lawrence Berkeley National Laboratory , Berkeley, California 94720, United States.
Andrew B
AB
Wong
Materials Sciences Division, Lawrence Berkeley National Laboratory , Berkeley, California 94720, United States.|Kavli Energy NanoScience Institute , Berkeley, California 94720, United States.
A Paul
AP
Alivisatos
Materials Sciences Division, Lawrence Berkeley National Laboratory , Berkeley, California 94720, United States.|Kavli Energy NanoScience Institute , Berkeley, California 94720, United States.
Peidong
P
Yang