Optical study on intrinsic exciton states in high-quality CH3NH3PbBr3 single crystals

doi:10.1103/PhysRevB.96.075308

	Optical study on intrinsic exciton states in high-quality CH3NH3PbBr3 single crystals
	Do, T. Thu Ha 1; del Aguila, A. Granados 1; Cui, Chao2 ; Xing, Jun 1; Ning, Zhijun2 ; Xiong, Qihua 1,3
	2017-08-24
发表期刊	PHYSICAL REVIEW B (IF:3.2[JCR-2023],3.3[5-Year])
ISSN	2469-9950
卷号	96 期号:7
发表状态	已发表
DOI	10.1103/PhysRevB.96.075308
摘要	Organolead halide perovskites have emerged as potential building blocks for photovoltaic and optoelectronic devices. Yet the underlying fundamental physics is not well understood. There is lack of agreement on the electronic band structures and binding energies of coupled electron-hole pairs (excitons), which drive the photophysical processes. In this work, we conducted temperature-dependent reflectance and photoluminescence experiments on high-quality CH3NH3PbBr3 single crystals. Two direct optical transitions corresponding to intrinsic free-excitons are clearly resolved, showing excellent consistence between the low-temperature (T = 10 K) reflectance and photoluminescence spectra. Remarkably, the excitons have different binding energies and behave oppositely with temperature, suggesting distinctive origins. Moreover, the asymmetric photoluminescence profile is counterintuitively dominated by the high-energy exciton that is explained by a long relaxation time between levels and by the favorable generation rate of electron-hole pairs at the high-energy band. Our study opens access to the intrinsic properties of CH3NH3PbBr3 and sheds light to reconcile the large range of binding energies reported on these emergent direct band-gap semiconductors.
收录类别	SCI ; EI
语种	英语
资助项目	Science and Technology Commission of Shanghai Municipality Project[16520720700]
WOS研究方向	Physics
WOS类目	Physics, Condensed Matter
WOS记录号	WOS:000408342200007
出版者	AMER PHYSICAL SOC
EI入藏号	20191906873384
EI主题词	Energy gap ; Excitons ; Lead compounds ; Open access ; Optoelectronic devices ; Perovskite ; Photoluminescence ; Reflection ; Single crystals ; Temperature
EI分类号	Minerals:482.2 ; Thermodynamics:641.1 ; Light/Optics:741.1 ; Optical Devices and Systems:741.3 ; Physical Chemistry:801.4 ; Crystalline Solids:933.1
WOS关键词	LEAD HALIDE PEROVSKITES ; LIGHT-EMITTING-DIODES ; SOLAR-CELLS ; TEMPERATURE-DEPENDENCE ; PHASE-TRANSITIONS ; BINDING-ENERGY ; PHOTOVOLTAIC APPLICATIONS ; ROOM-TEMPERATURE ; QUANTUM DOTS ; BAND-GAP
原始文献类型	Article
通讯作者	Ning, Zhijun
引用统计	正在获取...
文献类型	期刊论文
条目标识符	https://kms.shanghaitech.edu.cn/handle/2MSLDSTB/4513
专题	物质科学与技术学院物质科学与技术学院_PI研究组_宁志军组物质科学与技术学院_硕士生
通讯作者	Ning, Zhijun
作者单位	1.Nanyang Technol Univ, Sch Phys & Math Sci, Div Phys & Appl Phys, Singapore 637371, Singapore 2.ShanghaiTech Univ, Sch Phys Sci & Technol, Shanghai 201210, Peoples R China 3.Nanyang Technol Univ, Sch Elect & Elect Engn, Nanoelect Ctr Excellence, NOVITAS, Singapore 639798, Singapore
通讯作者单位	物质科学与技术学院
推荐引用方式 GB/T 7714	Do, T. Thu Ha,del Aguila, A. Granados,Cui, Chao,et al. Optical study on intrinsic exciton states in high-quality CH3NH3PbBr3 single crystals[J]. PHYSICAL REVIEW B,2017,96(7).
APA	Do, T. Thu Ha,del Aguila, A. Granados,Cui, Chao,Xing, Jun,Ning, Zhijun,&Xiong, Qihua.(2017).Optical study on intrinsic exciton states in high-quality CH3NH3PbBr3 single crystals.PHYSICAL REVIEW B,96(7).
MLA	Do, T. Thu Ha,et al."Optical study on intrinsic exciton states in high-quality CH3NH3PbBr3 single crystals".PHYSICAL REVIEW B 96.7(2017).