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Atomically thin cesium lead bromide perovskite quantum wires with high luminescence
Hongwen Huang1, Mei Liu, Jing Li
1Hefei National Laboratory for Physical Sciences at the Microscale, Hefei Science Center, National Synchrotron Radiation Laboratory & Synergetic Innovation Center of Quantum Information and Quantum Physics, Department of Chemical Physics, University of Science and Technology of China, Hefei, Anhui 230026, P. R. China. zengj@ustc.edu.cn xpwang@ustc.edu.cn.
We synthesized few-unit-cell-thick cesium lead bromide (CsPbBr3) quantum wells (QWs) at room temperature. Heat treatment enhanced their photoluminescence quantum yield (PLQY) to 21.13% by reducing defects.
Area of Science:
- Materials Science
- Nanotechnology
- Quantum Physics
Background:
- Cesium lead bromide (CsPbBr3) perovskites are promising optoelectronic materials.
- Achieving controlled synthesis of low-dimensional CsPbBr3 structures is crucial for tuning their properties.
Purpose of the Study:
- To report a room-temperature colloidal synthesis of few-unit-cell-thick CsPbBr3 quantum wells (QWs).
- To investigate the growth mechanism and optical properties of these QWs.
- To enhance the photoluminescence quantum yield (PLQY) of CsPbBr3 QWs.
Main Methods:
- Colloidal synthesis at room temperature.
- Surfactant-directed oriented attachment growth mechanism.
- Photoluminescence (PL) spectroscopy.
- Heat treatment for property enhancement.
Main Results:
- Successfully synthesized few-unit-cell-thick CsPbBr3 QWs with lengths over 100 nm.
- Observed a blue-shifted PL emission peak at 430 nm due to quantum confinement.
- Achieved an ensemble PLQY of 21.13% after heat treatment.
- Demonstrated the first-time dependence of bandgap on diameter for 1D CsPbBr3 QWs.
Conclusions:
- Room-temperature synthesis of ultrathin CsPbBr3 QWs is feasible.
- Heat treatment effectively passivates surface and defect states, boosting PLQY.
- The synthesized QWs provide a platform for studying quantum confinement effects in 1D perovskites.
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