气候变化领域集成服务门户(CCPortal): Exciton-phonon interaction in quasi-two dimensional layered (PEA)2(CsPbBr3): N -1PbBr4 perovskite

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DOI	10.1039/c9nr06834a
	Exciton-phonon interaction in quasi-two dimensional layered (PEA)2(CsPbBr3): N -1PbBr4 perovskite
	Long H.; Peng X.; Lu J.; Lin K.; Xie L.; Zhang B.; Ying L.; Wei Z.
发表日期	2019
ISSN	20403364
起始页码	21867
结束页码	21871
卷号	11 期号:45
英文摘要	Two-dimensional (2D) Ruddlesden-Popper perovskites with bulky organic cations have attracted extensive attention in light-emitting devices and photovoltaics due to their robust environment stability, tunable luminescent color, strong exciton binding and promising efficiency. A quantum well (QW) structure is spontaneously formed by sandwiching PbBr4 layers into bulky organic cations. However, some intrinsic excitonic mechanisms in these materials still need to be elucidated. In this study, the exciton-phonon interaction of quasi-2D (PEA)2(CsPbBr3)n-1PbBr4 with different PbBr4 layer numbers (n) was analyzed by temperature-varied photoluminescence (PL), scanning electron microscopy (SEM) and powder X-ray diffraction (PXRD). The mechanism of bandgap shifting with temperature was found to be dominated by the thermal expansion effect in the large-n 2D and bulk perovskite, and gradually switched to exciton-phonon interaction in the n = 1 (PEA)2PbBr4 phase, indicating enhanced exciton-phonon interaction in the thinner quantum well structure. Further analysis showed that the enhanced exciton-phonon interaction originated from the longitudinal optical phonon-exciton Fröhlich interaction rather than acoustic phonon-exciton coupling. We believe that our results will benefit the further optimization of light-emitting devices based on 2D perovskites. The Royal Society of Chemistry.
scopus关键词	Current density; Excitons; Lead compounds; Light emission; Perovskite; Phonons; Positive ions; Scanning electron microscopy; Semiconductor quantum wells; Thermal expansion; Environment stabilities; Exciton-phonon interactions; Light emitting devices; Longitudinal optical phonons; Powder X-ray diffraction (pXRD); Quantum well structures; Thermal expansion effect; Two Dimensional (2 D); Bromine compounds
来源期刊	Nanoscale
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/176274
作者单位	School of Electronic Science and Engineering (National Model Microelectronics College), Xiamen University, Xiamen, 361005, China; Engineering Research Center of Environment-Friendly Functional Materials, Ministry of Education, College of Materials Science and Engineering, Huaqiao University, Xiamen, China
推荐引用方式 GB/T 7714	Long H.,Peng X.,Lu J.,et al. Exciton-phonon interaction in quasi-two dimensional layered (PEA)2(CsPbBr3): N -1PbBr4 perovskite[J],2019,11(45).
APA	Long H..,Peng X..,Lu J..,Lin K..,Xie L..,...&Wei Z..(2019).Exciton-phonon interaction in quasi-two dimensional layered (PEA)2(CsPbBr3): N -1PbBr4 perovskite.Nanoscale,11(45).
MLA	Long H.,et al."Exciton-phonon interaction in quasi-two dimensional layered (PEA)2(CsPbBr3): N -1PbBr4 perovskite".Nanoscale 11.45(2019).