Zhao S, Guo T, Chu Z, Li Y, Xu W, Ran G. Growth of hopper-shaped CsPbCl
3 crystals and their exciton polariton emission.
RSC Adv 2021;
11:25653-25657. [PMID:
35478877 PMCID:
PMC9037009 DOI:
10.1039/d1ra03977f]
[Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/22/2021] [Accepted: 07/20/2021] [Indexed: 11/24/2022] Open
Abstract
CsPbCl3 is an attractive wide-bandgap perovskite semiconductor. Herein, we have grown hopper-shaped CsPbCl3 crystals in a solution droplet dripped on a heated substrate. During the growth, we have observed the impacts of the coffee ring effect and Marangoni flow, which may result in the hopper shape. Their photoluminescence spectra feature double peaks, which are located at 413.9 nm and 422.0 nm, respectively, and the latter increases faster in intensity than the former as the excitation power increases. We believe that the higher-energy peak originates from the excitonic emission and the lower-energy one is from the polaritons' emission, where the polaritons are generated in the exciton–exciton inelastic scattering process. Based on such an explanation, the exciton binding energy of CsPbCl3 is estimated to be 76.7 meV in our experiments, consistent with the previous reports.
We report hopper-shaped CsPbCl3 crystals grown in a solution droplet and the polariton emission from them.![]()
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